/* =====================================================
 *  太华动力 TAIHUA POWER — HashgraphVC Inspired
 *  Full-screen · Split Type · Interactive 3D
 * ===================================================== */

:root {
  --c-bg:        #ffffff;
  --c-bg-1:      #ffffff;
  --c-bg-2:      #f5f6f8;
  --c-text:      #1d1d1f;
  --c-text-2:    #6e6e73;
  --c-text-3:    #a1a1a6;
  --c-primary:   #ff6b35;
  --c-primary-2: #ff8a50;
  --c-line:      rgba(0,0,0,0.06);
  --c-line-2:    rgba(0,0,0,0.12);
  --c-surface:   rgba(0,0,0,0.03);

  --f-display: 'Inter', -apple-system, 'SF Pro Display', 'PingFang SC', sans-serif;
  --f-body:    'Inter', -apple-system, 'SF Pro Text', 'PingFang SC', sans-serif;
  --f-mono:    'JetBrains Mono', 'SF Mono', monospace;

  --ease-snappy: cubic-bezier(0.14, 1, 0.34, 1);
  --ease-out:    cubic-bezier(0.33, 1, 0.68, 1);

  --nav-h: 0px;
  --container: 1440px;
  --header-h: 84px;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  -webkit-font-smoothing: antialiased;
}
body {
  font-family: var(--f-body);
  background: #ffffff;
  background-attachment: fixed;
  color: var(--c-text);
  line-height: 1.5;
  /* 用 clip 而非 hidden：hidden 会让 body 变成滚动容器，破坏 position: sticky */
  overflow-x: hidden;
  overflow-x: clip;
  font-weight: 400;
  font-size: 16px;
  letter-spacing: 0;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }
input, textarea, select { font: inherit; color: inherit; }

::selection { background: var(--c-primary); color: var(--c-bg); }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--c-text-3); border-radius: 2px; }

/* ============ FULL SCREEN SECTIONS ============ */
.section {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  padding: var(--header-h) 0 0;
  overflow: hidden;
}
/* Shared background overlay for all sections — edge watermark style */
.section::before {
  content: '';
  position: absolute;
  z-index: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0;
  pointer-events: none;
  transition: opacity 1s;
}
/* Hero: no section bg, uses its own hero visual */
#home.section::before { display: none; }
/* About: stator coil centered glow */
#about.section::before {
  inset: 0;
  background-image: url('../images/products/stator/1 (3).jpg');
  opacity: 0.09;
  -webkit-mask-image: radial-gradient(ellipse 40% 45% at 30% 50%, black 30%, transparent 70%);
  mask-image: radial-gradient(ellipse 40% 45% at 30% 50%, black 30%, transparent 70%);
}
/* Products: handled by productShowcase */
#products.section::before { display: none; }
/* Tech: stator coils as full tech background */
#tech.section::before {
  inset: 0;
  background-image: url('../images/products/stator/1 (2).jpg');
  opacity: 0.09;
  -webkit-mask-image: radial-gradient(ellipse 45% 50% at 55% 45%, black 25%, transparent 70%);
  mask-image: radial-gradient(ellipse 45% 50% at 55% 45%, black 25%, transparent 70%);
}
/* Solutions: large motor right-side */
#solutions.section::before {
  top: 3%; right: -3%; width: 70%; height: 85%;
  background-image: url('../images/products/large/motor-07.jpg');
  background-size: contain; background-position: center right;
  opacity: 0.18;
  -webkit-mask-image: linear-gradient(-20deg, black 10%, transparent 65%);
  mask-image: linear-gradient(-20deg, black 10%, transparent 65%);
}
/* Custom: joint motor right-side */
#custom.section::before {
  top: 5%; right: -5%; width: 60%; height: 80%;
  background-image: url('../images/products/joint/2 (5).jpg');
  background-size: contain; background-position: center right;
  opacity: 0.09;
  -webkit-mask-image: linear-gradient(-20deg, black 10%, transparent 65%);
  mask-image: linear-gradient(-20deg, black 10%, transparent 65%);
}
/* Marketing: robot-dog left-side */
#marketing.section::before {
  top: 2%; right: -4%; width: 60%; height: 75%;
  background-image: url('../images/products/joint/2 (2).jpg');
  background-size: contain; background-position: top right;
  opacity: 0.09;
  -webkit-mask-image: linear-gradient(-20deg, black 10%, transparent 65%);
  mask-image: linear-gradient(-20deg, black 10%, transparent 65%);
}
/* Overseas: UAV aerial view */
#overseas.section::before {
  inset: 0;
  background-image: url('../images/products/uav/5.jpg');
  opacity: 0.07;
  -webkit-mask-image: radial-gradient(ellipse 45% 50% at 60% 50%, black 25%, transparent 70%);
  mask-image: radial-gradient(ellipse 45% 50% at 60% 50%, black 25%, transparent 70%);
}
/* News: armored vehicle right */
#news.section::before {
  top: 2%; right: -4%; width: 58%; height: 72%;
  background-image: url('../images/products/joint/2 (6).jpg');
  background-size: contain; background-position: top right;
  opacity: 0.09;
  -webkit-mask-image: linear-gradient(-20deg, black 10%, transparent 65%);
  mask-image: linear-gradient(-20deg, black 10%, transparent 65%);
}
/* Contact: underwater motor left */
#contact.section::before {
  inset: 5%; width: auto; height: auto;
  background-image: url('../images/products/standard/motor-01.jpg');
  background-size: contain; background-position: center;
  opacity: 0.08;
  -webkit-mask-image: radial-gradient(ellipse 45% 45% at 50% 50%, black 25%, transparent 70%);
  mask-image: radial-gradient(ellipse 45% 45% at 50% 50%, black 25%, transparent 70%);
}
/* Partners: motor centered glow */
#partners.section::before {
  inset: 0;
  background-image: url('../images/products/standard/motor-02.jpg');
  opacity: 0.06;
  -webkit-mask-image: radial-gradient(ellipse 45% 50% at 50% 50%, black 20%, transparent 75%);
  mask-image: radial-gradient(ellipse 45% 50% at 50% 50%, black 20%, transparent 75%);
}

/* Subtle edge rim light replace the aggressive shimmer */
.section::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  z-index: 1;
  background: linear-gradient(90deg, transparent 10%, rgba(255,107,53,0.08) 30%, rgba(167,139,250,0.08) 70%, transparent 90%);
  pointer-events: none;
  opacity: 0.6;
}

.section-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(2rem, 6vw, 6rem);
  position: relative;
  z-index: 2;
}
.section-label {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--c-text-3);
  letter-spacing: 0.08em;
  margin-bottom: 2rem;
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.section-label::after {
  content: '';
  flex: 1;
  max-width: 80px;
  height: 1px;
  background: var(--c-line-2);
}

/* ============ FIXED HEADER ============ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 clamp(2rem, 6vw, 6rem);
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0,0,0,0.08);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  transition: background 0.4s, border-color 0.4s;
}
.header > * { pointer-events: auto; }

.header-logo {
  display: flex;
  align-items: center;
  opacity: 0;
  transform: scale(0.9) rotate(-15deg);
  animation: headerLogoIn 1.4s var(--ease-snappy) 0.2s forwards;
  text-decoration: none;
}
@keyframes headerLogoIn {
  to { opacity: 1; transform: scale(1) rotate(0); }
}
.header-logo.visible {
  opacity: 1;
  transform: scale(1) rotate(0);
  animation: none;
}
.header-logo-img {
  width: 140px;
  height: auto;
  object-fit: contain;
  border-radius: 10px;
  background: #ffffff;
  padding: 6px 10px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.35);
}
/* Light mode: logo blends into white menu bar, no card border */
body.light-mode .header-logo-img {
  background: transparent;
  padding: 0;
  box-shadow: none;
  border-radius: 0;
}
.header-logo-text {
  display: none;
}
.header-logo-sub {
  display: none;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  opacity: 0;
  transform: translateY(8px);
  animation: headerNavIn 0.8s var(--ease-snappy) 0.5s forwards;
}
@keyframes headerNavIn {
  to { opacity: 1; transform: translateY(0); }
}
.header-nav.visible { opacity: 1; transform: translateY(0); animation: none; }

.header-menu {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}
.header-link {
  padding: 8px 16px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--c-text-2);
  border-radius: 6px;
  transition: all 0.3s;
  letter-spacing: 0.02em;
}
.header-link:hover { color: var(--c-text); background: var(--c-surface-2); }
.header-link.active { color: var(--c-primary); font-weight: 600; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 0.5rem;
  padding-left: 0.5rem;
  border-left: 1px solid var(--c-line);
}

.menu-toggle-btn {
  display: none;
  width: 36px; height: 36px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--c-line-2);
  border-radius: 6px;
  color: var(--c-text-2);
  background: var(--c-surface);
  transition: all 0.3s;
  font-size: 1.125rem;
}
.menu-toggle-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }

/* Mobile dropdown menu */
.mobile-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0; right: 0;
  background: rgba(10,25,50,0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-line);
  padding: 1rem 0;
  z-index: 100;
}
.mobile-dropdown.open { display: block; }
.mobile-dropdown .header-link {
  display: block;
  padding: 14px clamp(2rem, 6vw, 6rem);
  font-size: 1rem;
  border-bottom: 1px solid var(--c-line);
  border-radius: 0;
}

.lang-toggle {
  padding: 6px 14px;
  border: 1px solid var(--c-line-2);
  border-radius: 999px;
  font-size: 0.6875rem;
  font-family: var(--f-mono);
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--c-text-2);
  background: var(--c-surface);
  transition: all 0.3s;
}
.lang-toggle:hover { border-color: var(--c-text-3); color: var(--c-text); }

/* ============ FLOATING SIDE MENU (blue bg, white text) ============ */
.side-menu {
  position: fixed;
  top: 50%;
  right: 1.5rem;
  transform: translateY(-50%);
  z-index: 95;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.25rem;
  min-width: 172px;
  padding: 0.9rem 0.6rem;
  background: linear-gradient(180deg, rgba(13,71,161,0.92) 0%, rgba(10,28,56,0.95) 100%);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 18px;
  box-shadow: 0 18px 48px rgba(10,25,50,0.38), inset 0 1px 0 rgba(255,255,255,0.12);
  opacity: 1;
  visibility: visible;
}
.side-menu-head {
  padding: 0.35rem 0.6rem 0.7rem;
  border-bottom: 1px solid rgba(255,255,255,0.14);
  margin-bottom: 0.45rem;
  display: flex;
  justify-content: center;
}
.side-menu-logo {
  width: 120px;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
  background: rgba(255,255,255,0.96);
  padding: 4px 8px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
}
.side-menu-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.side-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0.75rem;
  border-radius: 10px;
  color: rgba(255,255,255,0.78);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: all 0.25s ease;
  position: relative;
}
.side-num {
  font-family: var(--f-mono);
  font-size: 0.625rem;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.08em;
  min-width: 18px;
}
.side-link:hover {
  background: rgba(255,255,255,0.1);
  color: #ffffff;
  transform: translateX(2px);
}
.side-link.active {
  background: rgba(255,255,255,0.16);
  color: #ffffff;
  font-weight: 600;
  box-shadow: inset 3px 0 0 #ff6b35;
}
.side-link.active .side-num { color: #ff8a50; }
.side-menu-foot {
  margin-top: 0.45rem;
  padding: 0.55rem 0.6rem 0.15rem;
  border-top: 1px solid rgba(255,255,255,0.14);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.side-lang {
  padding: 5px 14px;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 999px;
  font-size: 0.6875rem;
  font-family: var(--f-mono);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.85);
  background: rgba(255,255,255,0.08);
  cursor: pointer;
  transition: all 0.3s;
}
.side-lang:hover { border-color: #4fc3f7; color: #4fc3f7; background: rgba(255,255,255,0.14); }
.side-menu-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: radial-gradient(circle, #ff6b35 0%, rgba(255,107,53,0.2) 70%);
  box-shadow: 0 0 10px rgba(255,107,53,0.6);
  animation: sidePulse 2.2s ease-in-out infinite;
}
@keyframes sidePulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.85); }
}
/* Responsive: smaller floating side menu on narrow screens, always visible */
@media (max-width: 1024px) {
  .side-menu {
    right: 0.75rem;
    min-width: 132px;
    padding: 0.6rem 0.4rem;
    border-radius: 14px;
  }
  .side-menu-head { padding: 0.2rem 0.4rem 0.5rem; }
  .side-menu-logo { width: 84px; }
  .side-link { padding: 0.4rem 0.55rem; font-size: 0.8125rem; }
  .side-num { display: none; }
  .side-menu-foot { padding: 0.4rem 0.4rem 0.1rem; }
}

/* ============ SPLIT HEADINGS ============ */
.split-heading {
  font-size: clamp(2.5rem, 6vw, 5.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}
.split-heading .line {
  display: block;
  overflow: hidden;
}
.split-heading .line span {
  display: block;
  opacity: 0;
  transform: translateY(100%);
  transition: transform 1.2s var(--ease-snappy), opacity 0.01s linear 1.2s;
}
.split-heading .line.in span {
  opacity: 1;
  transform: translateY(0);
}
.split-heading .line:nth-child(2) span { transition-delay: 0.08s; }
.split-heading .line:nth-child(3) span { transition-delay: 0.16s; }
.split-heading .hl {
  background: linear-gradient(135deg, #ff6b35 0%, #ff8a50 40%, #a78bfa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.split-desc {
  font-size: 1rem;
  color: var(--c-text-2);
  max-width: 520px;
  line-height: 1.7;
  font-weight: 400;
  margin-bottom: 2rem;
}

/* ============ HERO ============ */
.hero-section {
  position: relative;
}
.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(79, 195, 247, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(30, 136, 229, 0.08) 0%, transparent 50%);
  z-index: 0;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-3d-wrap {
  position: relative;
  height: 100%;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 16px;
}
.hero-product-frame {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-surface);
}
.hero-product-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.9) contrast(1.1);
  transition: transform 0.8s var(--ease-snappy);
}
.hero-product-frame:hover img {
  transform: scale(1.05);
}
/* Strong gradient edge mask to blend with content */
.hero-3d-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--c-bg) 0%, transparent 25%);
  pointer-events: none;
  z-index: 1;
}
/* Subtle bottom shadow for depth */
.hero-3d-wrap::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 40%;
  background: linear-gradient(0deg, rgba(10,25,50,0.5) 0%, transparent 100%);
  pointer-events: none;
  z-index: 1;
}
.hero-3d-wrap .motor-3d:active { cursor: grabbing; }
.hero-3d-wrap .motor-3d svg { width: 100%; height: 100%; }

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--f-mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-3);
  opacity: 0;
  animation: fadeUp 0.8s var(--ease-snappy) 1.5s forwards;
}
@keyframes fadeUp {
  to { opacity: 0.6; transform: translateX(-50%) translateY(0); }
}
.hero-scroll .arrow {
  width: 1px; height: 24px;
  background: linear-gradient(180deg, var(--c-text-3), transparent);
  animation: scrollArrow 2s ease-in-out infinite;
}
@keyframes scrollArrow {
  0% { opacity: 0; transform: scaleY(0); }
  50% { opacity: 1; }
  100% { opacity: 0; transform: scaleY(1); }
}

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: all 0.4s var(--ease-snappy);
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--c-text);
  color: var(--c-bg);
  border-color: var(--c-text);
}
.btn-primary:hover { background: var(--c-primary); border-color: var(--c-primary); }
.btn-ghost {
  border: 1px solid var(--c-line-2);
  color: var(--c-text-2);
}
.btn-ghost:hover { border-color: var(--c-text-3); color: var(--c-text); }

.btn-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--c-text-2);
  transition: all 0.3s;
  letter-spacing: 0.02em;
}
.btn-arrow svg { transition: transform 0.3s var(--ease-snappy); }
.btn-arrow:hover { color: var(--c-text); }
.btn-arrow:hover svg { transform: translateX(4px); }

/* ============ ABOUT / BASE SECTION ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 5rem;
  align-items: center;
}
.about-number {
  font-family: var(--f-mono);
  font-size: 0.875rem;
  color: var(--c-text-3);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.about-visual {
  position: relative;
  max-width: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-img-frame {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-surface);
  box-shadow: 0 24px 60px rgba(0,0,0,0.4);
  position: relative;
}
.about-img-frame img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(0.9) contrast(1.1);
  transition: transform 0.8s var(--ease-snappy);
}
.about-img-frame:hover img { transform: scale(1.05); }
.about-img-frame::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(0deg, rgba(10,25,50,0.55) 0%, transparent 40%);
  pointer-events: none;
}
.about-img-badge {
  position: absolute;
  bottom: 24px; left: 24px;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.about-badge-num {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #ff6b35 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  filter: drop-shadow(0 0 20px rgba(255,107,53,0.4));
}
.about-badge-label {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-text-2);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 2.5rem;
}
.feature {
  padding: 20px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  background: var(--c-surface);
  transition: all 0.3s var(--ease-snappy);
}
.feature:hover {
  border-color: var(--c-line-2);
  background: rgba(255,255,255,0.05);
}
.feature .icon {
  width: 36px; height: 36px;
  margin-bottom: 12px;
  color: var(--c-primary);
}
.feature h4 { font-size: 1rem; margin-bottom: 6px; font-weight: 600; letter-spacing: -0.01em; }
.feature p { font-size: 0.875rem; color: var(--c-text-2); line-height: 1.6; }

/* ============ PRODUCTS (Company-style) ============ */
.section-products { position: relative; }

.product-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 3rem;
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-text-3);
}
.product-nav-btn {
  width: 36px; height: 36px;
  border: 1px solid var(--c-line-2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  color: var(--c-text-2);
}
.product-nav-btn:hover {
  border-color: var(--c-text-3);
  color: var(--c-text);
}

.product-showcase {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.product-image-wrap {
  position: relative;
  height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  border: 1px solid var(--c-line);
  background: var(--c-surface);
}
.product-photo {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}
.product-photo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.6s var(--ease-snappy);
  padding: 1rem;
  filter: brightness(0.95) contrast(1.05);
}
.product-image-wrap:hover .product-photo img {
  transform: scale(1.08);
}
/* Glass reflection overlay on photo */
.product-photo::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 40%, transparent 60%, rgba(255,255,255,0.02) 100%);
  pointer-events: none;
}
/* Product image nav arrows */
.product-image-nav {
  position: absolute;
  bottom: 16px; left: 16px;
  z-index: 3;
  display: flex;
  gap: 8px;
}
.product-image-nav button {
  width: 36px; height: 36px;
  border: 1px solid var(--c-line-2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-2);
  background: rgba(13,37,71,0.7);
  backdrop-filter: blur(8px);
  transition: all 0.3s;
  font-size: 0.875rem;
}
.product-image-nav button:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  background: rgba(255,107,53,0.15);
}

.product-info h2 {
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}
.product-info .sub-label {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  font-weight: 500;
}
.product-info p {
  font-size: 1rem;
  color: var(--c-text-2);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}
.product-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 2rem;
}
.product-specs span {
  padding: 6px 12px;
  border: 1px solid var(--c-line-2);
  border-radius: 6px;
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  color: var(--c-text-2);
  letter-spacing: 0.03em;
  background: var(--c-surface);
}

/* ============ TECH ============ */
.section-tech {
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}
.tech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.tech-visual {
  position: relative;
  aspect-ratio: 1;
  max-width: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.tech-mesh {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 30% 30%, var(--c-primary) 0%, transparent 15%),
    radial-gradient(circle at 70% 70%, rgba(167,139,250,0.5) 0%, transparent 15%);
  filter: blur(40px);
  opacity: 0.2;
  animation: mesh 8s ease-in-out infinite;
}
@keyframes mesh {
  0%, 100% { transform: scale(1) rotate(0); }
  50% { transform: scale(1.1) rotate(180deg); }
}
.tech-rings { position: relative; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.tech-rings svg { width: 75%; height: 75%; }

.tech-steps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 2rem;
}
.tech-step {
  padding: 20px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  transition: all 0.3s;
  background: var(--c-surface);
}
.tech-step:hover { border-color: var(--c-line-2); background: rgba(255,255,255,0.05); }
.tech-step .n {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-primary);
  margin-bottom: 6px;
  font-weight: 500;
}
.tech-step h4 { font-size: 1rem; margin-bottom: 4px; font-weight: 600; }
.tech-step p { font-size: 0.8125rem; color: var(--c-text-2); line-height: 1.6; }

.tech-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 2rem;
  padding: 1.5rem;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  background: var(--c-surface);
}
.tech-metric { text-align: center; }
.tech-metric .v {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #ff6b35 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.tech-metric .l { font-size: 0.75rem; color: var(--c-text-3); margin-top: 4px; font-weight: 500; }

/* ============ PORTFOLIO (Solutions/Marketing) ============ */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.portfolio-card {
  padding: 28px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  transition: all 0.3s var(--ease-snappy);
  background: var(--c-surface);
  position: relative;
  overflow: hidden;
}
.portfolio-card::before {
  content: '';
  position: absolute;
  bottom: 0; right: 0;
  width: 40%; height: 50%;
  background-image: var(--img);
  background-size: contain;
  background-position: bottom right;
  background-repeat: no-repeat;
  opacity: 0.04;
  transition: opacity 0.5s;
  z-index: 0;
  -webkit-mask-image: linear-gradient(-30deg, black 15%, transparent 70%);
  mask-image: linear-gradient(-30deg, black 15%, transparent 70%);
}
.portfolio-card:hover::before { opacity: 0.12; }
.portfolio-card:hover::before { opacity: 0.12; }
.portfolio-card:hover { border-color: var(--c-line-2); background: rgba(255,255,255,0.05); }
.portfolio-card .icon { font-size: 1.5rem; margin-bottom: 12px; display: block; position: relative; z-index: 1; }
.portfolio-card h3 { font-size: 1.125rem; margin-bottom: 8px; font-weight: 600; position: relative; z-index: 1; }
.portfolio-card p { font-size: 0.875rem; color: var(--c-text-2); line-height: 1.6; position: relative; z-index: 1; }

/* ============ TEAM / CUSTOM ============ */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 2rem 0;
}
.team-step {
  padding: 28px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  text-align: center;
  transition: all 0.3s;
  background: var(--c-surface);
}
.team-step:hover { border-color: var(--c-line-2); background: rgba(255,255,255,0.05); }
.team-step .n {
  width: 40px; height: 40px;
  margin: 0 auto 12px;
  border: 1px solid var(--c-line-2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-text-2);
  font-family: var(--f-mono);
}
.team-step h4 { font-size: 1rem; margin-bottom: 4px; }
.team-step p { font-size: 0.8125rem; color: var(--c-text-2); line-height: 1.6; }

/* ============ OVERSEAS ============ */
.overseas-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.overseas-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 2rem 0;
}
.overseas-stat {
  padding: 20px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  text-align: center;
  background: var(--c-surface);
}
.overseas-stat .v {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #ff6b35 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.overseas-stat .l { font-size: 0.75rem; color: var(--c-text-3); margin-top: 4px; }

.globe-wrap {
  position: relative;
  aspect-ratio: 1;
  max-width: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.globe-wrap .globe { width: 100%; }

/* ============ NEWS ============ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.news-card {
  padding: 24px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  transition: all 0.3s;
  background: var(--c-surface);
  position: relative;
  overflow: hidden;
}
.news-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 50%; height: 100%;
  background-image: var(--img);
  background-size: contain;
  background-position: top right;
  background-repeat: no-repeat;
  opacity: 0.04;
  transition: opacity 0.5s;
  z-index: 0;
  -webkit-mask-image: linear-gradient(-90deg, black 10%, transparent 80%);
  mask-image: linear-gradient(-90deg, black 10%, transparent 80%);
}
.news-card:hover::before { opacity: 0.12; }
.news-card:hover::before { opacity: 0.18; }
.news-card:hover { border-color: var(--c-line-2); background: rgba(255,255,255,0.05); }
.news-card .date, .news-card .tag, .news-card h3, .news-card p { position: relative; z-index: 1; }
.news-card .date {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  color: var(--c-text-3);
  margin-bottom: 8px;
}
.news-card .tag {
  font-family: var(--f-mono);
  font-size: 0.625rem;
  color: var(--c-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 8px;
  font-weight: 500;
}
.news-card h3 { font-size: 1rem; margin-bottom: 8px; font-weight: 600; line-height: 1.4; }
.news-card p { font-size: 0.8125rem; color: var(--c-text-2); line-height: 1.6; }

/* ============ CONTACT ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: start;
}
.contact-list { margin-top: 2rem; }
.contact-item {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line);
}
.contact-item:last-child { border-bottom: none; }
.contact-item .icon {
  width: 40px; height: 40px;
  border: 1px solid var(--c-line-2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-primary);
  flex-shrink: 0;
}
.contact-item .label {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  color: var(--c-text-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 2px;
  font-weight: 500;
}
.contact-item .val { font-size: 0.9375rem; color: var(--c-text); }

.form-card {
  padding: 32px;
  border: 1px solid var(--c-line);
  border-radius: 12px;
  background: var(--c-surface);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 14px; }
.form-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.form-field label {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  color: var(--c-text-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
}
.form-field input, .form-field textarea, .form-field select {
  width: 100%;
  padding: 12px 14px;
  background: var(--c-bg);
  border: 1px solid var(--c-line-2);
  border-radius: 6px;
  color: var(--c-text);
  font-size: 0.9375rem;
  transition: all 0.3s;
}
.form-field input:focus, .form-field textarea:focus, .form-field select:focus {
  outline: none;
  border-color: var(--c-primary);
  background: rgba(255,107,53,0.03);
}
.form-field textarea { resize: vertical; min-height: 100px; }
.form-submit { width: 100%; margin-top: 8px; }
.form-success {
  margin-top: 12px;
  padding: 10px 14px;
  background: rgba(52,199,89,0.08);
  border: 1px solid rgba(52,199,89,0.2);
  border-radius: 6px;
  color: #34c759;
  font-size: 0.8125rem;
  text-align: center;
  display: none;
}
.form-success.show { display: block; }

/* ============ FOOTER ============ */
.footer {
  border-top: 1px solid var(--c-line);
  padding: 3rem 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(2rem, 6vw, 6rem);
}
.footer-copy {
  font-size: 0.75rem;
  color: var(--c-text-3);
  font-family: var(--f-mono);
}
.footer-links {
  display: flex;
  gap: 1.5rem;
}
.footer-links a {
  font-size: 0.75rem;
  color: var(--c-text-3);
  transition: color 0.3s;
  font-family: var(--f-mono);
}
body.light-mode .footer-links a { color: #6e6e73; }
.footer-links a:hover { color: var(--c-text); }

/* ============ REVEAL ============ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s var(--ease-snappy), transform 0.8s var(--ease-snappy);
}
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal-d1 { transition-delay: 0.05s; }
.reveal-d2 { transition-delay: 0.15s; }
.reveal-d3 { transition-delay: 0.25s; }
.reveal-d4 { transition-delay: 0.35s; }

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .hero-inner, .about-grid, .product-showcase, .tech-grid, .overseas-grid, .contact-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .portfolio-grid, .news-grid { grid-template-columns: 1fr 1fr; }
  .team-grid { grid-template-columns: 1fr 1fr; }
  .tech-metrics { grid-template-columns: 1fr 1fr; }
  .hero-3d-wrap { height: 360px; }
  .hero-product-frame { max-width: 380px; }
  .hero-product-frame img { padding: 1rem; }
  .product-image-wrap { height: 360px; }
  .header-menu { display: none; }
  .menu-toggle-btn { display: flex; }
  .header-actions { border-left: none; margin-left: 0; padding-left: 0; }
}

@media (max-width: 640px) {
  .split-heading { font-size: clamp(1.75rem, 10vw, 2.5rem); }
  .portfolio-grid, .news-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; }
  .feature-grid, .tech-steps, .form-row, .overseas-stats { grid-template-columns: 1fr; }
  .hero-3d-wrap { height: 280px; }
  .hero-3d-wrap .motor-3d { width: 200px; height: 200px; }
  .product-image-wrap { height: 280px; }
  .product-3d-float { width: 80px; height: 80px; bottom: 8px; right: 8px; padding: 4px; }
  .section { padding: 3rem 0; min-height: auto; }
  .footer-inner { flex-direction: column; text-align: center; }
}

/* ===== P0-1: Scroll Progress Bar ===== */
#progressBar { position:fixed; top:0; left:0; width:100%; height:2px; z-index:200; background:rgba(255,255,255,0.04); pointer-events:none; }
#progressFill { height:100%; width:0%; background:linear-gradient(90deg,#ff6b35,#a78bfa); box-shadow:0 0 16px rgba(255,107,53,0.6); border-radius:0 2px 2px 0; transition:width 0.1s linear; }

/* ===== P0-4: Magnetic Buttons ===== */
.btn-magnetic { transition:transform 0.15s ease-out; will-change:transform; }
.btn-magnetic:hover { transform:translateY(-2px); }

/* ===== P1-5: Image Reveal ===== */
.reveal-img { clip-path:inset(0 0 100% 0); transition:clip-path 1.2s var(--ease-snappy); will-change:clip-path; }
.reveal-img.in { clip-path:inset(0 0 0 0); }

/* ===== P1-6: Gradient Border Glow ===== */
@property --ga { syntax:'<angle>'; initial-value:0deg; inherits:false; }
.card-glow { position:relative; z-index:1; }
.card-glow::after { content:''; position:absolute; inset:-1px; border-radius:inherit; z-index:-1; background:conic-gradient(from var(--ga), transparent, rgba(255,107,53,0.25), transparent, rgba(167,139,250,0.25), transparent); animation:gs 3s linear infinite; opacity:0; transition:opacity 0.4s; pointer-events:none; }
.card-glow:hover::after { opacity:1; }
@keyframes gs { to { --ga:360deg; } }

/* ===== P2-9: Light Mode ===== */
body.light-mode { --c-bg:#ffffff; --c-bg-1:#ffffff; --c-bg-2:#f5f6f8; --c-text:#1d1d1f; --c-text-2:#6e6e73; --c-text-3:#a1a1a6; --c-surface:rgba(0,0,0,0.03); --c-line:rgba(0,0,0,0.06); --c-line-2:rgba(0,0,0,0.12); }
body.light-mode { background: #ffffff; }
body.light-mode .hero-section::before {
  background:
    radial-gradient(ellipse at 20% 30%, rgba(255,107,53,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(167,139,250,0.03) 0%, transparent 50%);
}
/* Light mode: product images more visible */
body.light-mode .section::before {
  opacity: 0.12 !important;
  mix-blend-mode: multiply;
}
body.light-mode #home.section::before,
body.light-mode #products.section::before { display: none; }
body.light-mode .hero-product-frame { border-color: rgba(0,0,0,0.08); box-shadow: 0 24px 60px rgba(0,0,0,0.08); }
body.light-mode .about-img-frame { box-shadow: 0 24px 60px rgba(0,0,0,0.08); }
body.light-mode .header-logo-text { color:#1d1d1f; }
/* Light mode menu bar: white glass background, dark text */
body.light-mode .header {
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0,0,0,0.08);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
body.light-mode .header-link { color: #1d1d1f; }
body.light-mode .header-link:hover { color: var(--c-primary); background: rgba(255,107,53,0.08); }
body.light-mode .header-link.active { color: var(--c-primary); }
body.light-mode .lang-toggle {
  border-color: rgba(0,0,0,0.15);
  color: #1d1d1f;
  background: rgba(0,0,0,0.03);
}
body.light-mode .lang-toggle:hover { border-color: var(--c-primary); color: var(--c-primary); }
body.light-mode .mobile-dropdown { background: rgba(255,255,255,0.97); border-bottom: 1px solid rgba(0,0,0,0.08); }
body.light-mode .mobile-dropdown .header-link { color: #1d1d1f; border-color: rgba(0,0,0,0.06); }
body.light-mode .mobile-dropdown .header-link.active { color: var(--c-primary); }
body.light-mode .btn-primary { color:white; }
body.light-mode .scroll-dot.active { box-shadow: 0 0 8px rgba(255,107,53,0.4); }
body.light-mode .about-badge-num { filter: drop-shadow(0 0 12px rgba(79,195,247,0.25)); }
body.light-mode .tech-metric .v,
body.light-mode .overseas-stat .v,
body.light-mode .about-badge-num {
  background: linear-gradient(135deg, #0d47a1 0%, #1976d2 40%, #4fc3f7 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
/* ===== Light mode blue decorative accents ===== */
body.light-mode { background: #ffffff; }
body.light-mode::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 0% 0%, rgba(79,195,247,0.10) 0%, transparent 45%),
    radial-gradient(ellipse at 100% 100%, rgba(13,71,161,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 100% 0%, rgba(25,118,210,0.05) 0%, transparent 40%);
  pointer-events: none;
  z-index: -1;
}
body.light-mode .hero-section::before {
  background:
    radial-gradient(ellipse at 20% 30%, rgba(79,195,247,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(25,118,210,0.06) 0%, transparent 50%);
}
/* Blue accent lines on section edges */
body.light-mode .section::after {
  background: linear-gradient(90deg, transparent 10%, rgba(79,195,247,0.25) 30%, rgba(13,71,161,0.25) 70%, transparent 90%);
}
/* Blue kicker / number labels */
body.light-mode .kicker,
body.light-mode .about-number,
body.light-mode .section-label {
  color: #1976d2;
}
body.light-mode .kicker::before,
body.light-mode .about-number::before {
  color: #4fc3f7;
}
/* Blue card hover accents */
body.light-mode .portfolio-card:hover,
body.light-mode .news-card:hover,
body.light-mode .tech-step:hover,
body.light-mode .team-step:hover,
body.light-mode .marketing-card:hover,
body.light-mode .overseas-stat:hover {
  border-color: rgba(25,118,210,0.3);
  box-shadow: 0 12px 32px rgba(25,118,210,0.12);
}
/* Blue scroll dot */
body.light-mode .scroll-dot.active {
  background: #1976d2;
  border-color: #1976d2;
  box-shadow: 0 0 8px rgba(25,118,210,0.5);
}
body.light-mode .scroll-dot:hover { border-color: #4fc3f7; }
/* Blue nav active link */
body.light-mode .nav-cta,
body.light-mode .btn-primary {
  background: linear-gradient(135deg, #1976d2 0%, #0d47a1 100%);
  color: #ffffff;
}
body.light-mode .btn-primary:hover { box-shadow: 0 8px 24px rgba(25,118,210,0.35); }
/* Blue marquee dots */
body.light-mode .marquee-item::after { color: #4fc3f7; }
/* Blue form focus */
body.light-mode .form-field input:focus,
body.light-mode .form-field textarea:focus,
body.light-mode .form-field select:focus {
  border-color: #1976d2;
  box-shadow: 0 0 0 3px rgba(25,118,210,0.12);
}
/* Blue progress bar */
body.light-mode #progressFill {
  background: linear-gradient(90deg, #4fc3f7, #0d47a1);
}
@media (max-width:640px) { #partners { min-height:30vh !important; } #partners .marquee-item { font-size:1rem !important; } }

/* ===== Page Load Animation (opacity only — no transform, keeps position:fixed intact) ===== */
body { opacity: 0; transition: opacity 0.8s ease; }
body.page-loaded { opacity: 1; }
body.page-loaded .split-heading .line:nth-child(1) span { transition-delay: 0.3s !important; }
body.page-loaded .split-heading .line:nth-child(2) span { transition-delay: 0.4s !important; }
body.page-loaded .split-heading .line:nth-child(3) span { transition-delay: 0.5s !important; }

/* ===== Smooth Scroll Indicator (Dot Nav) ===== */
.scroll-indicator {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 12px;
  opacity: 0;
  transition: opacity 0.6s ease 1s;
}
.scroll-indicator.visible { opacity: 1; }
.scroll-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  border: 1.5px solid var(--c-text-3);
  background: transparent;
  cursor: pointer;
  transition: all 0.3s var(--ease-snappy);
  position: relative;
  padding: 0;
}
.scroll-dot::before {
  content: attr(data-label);
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--f-mono);
  font-size: 0.625rem;
  color: var(--c-text-2);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.scroll-dot:hover::before { opacity: 0.8; }
.scroll-dot:hover { border-color: var(--c-primary); }
.scroll-dot.active {
  background: var(--c-primary);
  border-color: var(--c-primary);
  box-shadow: 0 0 8px rgba(255,107,53,0.6);
  transform: scale(1.3);
}
@media (max-width: 768px) {
  .scroll-indicator { display: none; }
}


/* ===== SVG Icon System ===== */
.feature .icon, .portfolio-card .icon, .contact-item .icon {
  display: flex;
  align-items: center;
  justify-content: center;
}
.portfolio-card .icon { font-size: 0; }
.portfolio-card .icon svg { width: 24px; height: 24px; }
.feature .icon svg { width: 22px; height: 22px; }
.contact-item .icon svg { width: 20px; height: 20px; }
#themeToggleBtn, #menuToggleBtn, #prevProduct, #nextProduct {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.menu-toggle-btn svg, .product-image-nav button svg {
  width: 18px;
  height: 18px;
}

/* =====================================================
 *  多页架构样式（导航下拉 / 侧边栏手风琴 / 子页面）
 * ===================================================== */

/* ===== 顶部导航：下拉子菜单 ===== */
.header-menu { display: flex; gap: 0.15rem; align-items: center; }
.nav-item { position: relative; }
.nav-link {
  display: flex; align-items: center; gap: 3px;
  padding: 8px 13px;
  font-size: 1rem; font-weight: 500;
  color: #1d1d1f; border-radius: 6px;
  transition: all 0.25s; text-decoration: none;
}
.nav-caret { display: inline-flex; opacity: 0.5; transition: transform 0.25s; }
.nav-item:hover .nav-caret { transform: rotate(180deg); opacity: 1; }
/* 悬停：浅蓝色 */
.nav-link:hover { color: #4fc3f7; background: rgba(79,195,247,0.1); }
/* 选中：深蓝色 */
.nav-item.active > .nav-link { color: #0d47a1; font-weight: 600; }
.nav-dropdown {
  position: absolute; top: 100%; left: 0;
  min-width: 160px;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: 10px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.12);
  padding: 6px;
  opacity: 0; visibility: hidden;
  transform: translateY(8px);
  transition: all 0.25s ease;
  z-index: 200;
}
.nav-item:hover .nav-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-sub-link {
  display: block;
  padding: 9px 14px;
  font-size: 0.875rem; color: #1d1d1f;
  border-radius: 6px; text-decoration: none;
  transition: all 0.2s;
}
.nav-sub-link:hover { background: rgba(79,195,247,0.12); color: #4fc3f7; padding-left: 18px; }

/* ===== 侧边栏手风琴子菜单 ===== */
.side-item { display: flex; flex-direction: column; }
.side-item-link {
  display: flex; align-items: center; gap: 0.65rem;
  padding: 0.5rem 0.75rem; border-radius: 10px;
  color: rgba(255,255,255,0.78); font-size: 0.9375rem; font-weight: 500;
  text-decoration: none; transition: all 0.25s; width: 100%;
}
.side-num { font-family: var(--f-mono); font-size: 0.625rem; color: rgba(255,255,255,0.4); min-width: 18px; letter-spacing: 0.08em; }
.side-txt { flex: 1; }
.side-arrow { display: inline-flex; opacity: 0.5; transition: transform 0.3s; margin-left: auto; }
.side-arrow.rotated { transform: rotate(180deg); }
.side-item-link:hover { background: rgba(255,255,255,0.1); color: #fff; }
.side-item.active > .side-item-link { background: rgba(255,255,255,0.16); color: #fff; font-weight: 600; box-shadow: inset 3px 0 0 #ff6b35; }
.side-item.active > .side-item-link .side-num { color: #ff8a50; }
.side-subs {
  max-height: 0; overflow: hidden;
  transition: max-height 0.35s ease;
  padding-left: 24px;
}
.side-subs.open { max-height: 400px; }
.side-sub-link {
  display: block; padding: 7px 14px;
  font-size: 0.8125rem; color: rgba(255,255,255,0.6);
  text-decoration: none; border-left: 1px solid rgba(255,255,255,0.15);
  transition: all 0.2s;
}
.side-sub-link:hover { color: #4fc3f7; border-left-color: #4fc3f7; padding-left: 18px; }

/* ===== 移动端下拉 ===== */
.mobile-link, .mobile-sub-link {
  display: block; padding: 12px 24px;
  font-size: 1rem; color: #1d1d1f; text-decoration: none;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.mobile-link { font-weight: 600; }
.mobile-link.active, .mobile-sub-link.active { color: var(--c-primary); }
.mobile-sub-link { padding-left: 40px; font-size: 0.875rem; color: #6e6e73; }

/* ===== 子页面通用布局 ===== */
.page-main { padding-top: var(--header-h); min-height: 100vh; }
.page-hero {
  position: relative;
  padding: 6rem clamp(2rem, 6vw, 6rem) 4rem;
  background: linear-gradient(135deg, #0d47a1 0%, #1565c0 100%);
  color: #fff;
  overflow: hidden;
}
/* 各页面 Banner 背景：产品图高透明度点缀（左侧深色保护文字，右侧隐约可见轮廓） */
body[data-page="about"] .page-hero {
  background:
    linear-gradient(120deg, rgba(8,24,48,0.95) 0%, rgba(13,71,161,0.88) 55%, rgba(21,101,192,0.78) 100%),
    url('../images/hero/banner-about.jpg') right center / cover no-repeat;
}
body[data-page="products"] .page-hero {
  background:
    linear-gradient(120deg, rgba(8,24,48,0.95) 0%, rgba(13,71,161,0.88) 55%, rgba(21,101,192,0.78) 100%),
    url('../images/hero/banner-products.jpg') right center / cover no-repeat;
}
body[data-page="news"] .page-hero {
  background:
    linear-gradient(120deg, rgba(8,24,48,0.95) 0%, rgba(13,71,161,0.88) 55%, rgba(21,101,192,0.78) 100%),
    url('../images/hero/banner-news.jpg') right center / cover no-repeat;
}
body[data-page="solutions"] .page-hero {
  background:
    linear-gradient(120deg, rgba(8,24,48,0.95) 0%, rgba(13,71,161,0.88) 55%, rgba(21,101,192,0.78) 100%),
    url('../images/hero/banner-solutions.jpg') right center / cover no-repeat;
}
body[data-page="support"] .page-hero {
  background:
    linear-gradient(120deg, rgba(8,24,48,0.95) 0%, rgba(13,71,161,0.88) 55%, rgba(21,101,192,0.78) 100%),
    url('../images/hero/banner-support.jpg') right center / cover no-repeat;
}
body[data-page="clients"] .page-hero {
  background:
    linear-gradient(120deg, rgba(8,24,48,0.97) 0%, rgba(13,71,161,0.92) 55%, rgba(21,101,192,0.85) 100%),
    url('../images/hero/banner-clients.jpg') right center / auto 72% no-repeat;
}
body[data-page="contact"] .page-hero {
  background:
    linear-gradient(120deg, rgba(8,24,48,0.95) 0%, rgba(13,71,161,0.88) 55%, rgba(21,101,192,0.78) 100%),
    url('../images/hero/banner-contact.jpg') right center / cover no-repeat;
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 80% 20%, rgba(255,107,53,0.15), transparent 50%);
}
.page-hero-content { position: relative; z-index: 1; max-width: var(--container); margin: 0 auto; }
.page-hero h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 700; line-height: 1.1; margin-bottom: 1rem; letter-spacing: -0.02em; }
.page-hero .page-subtitle { font-size: 1.125rem; opacity: 0.85; max-width: 600px; line-height: 1.6; }
.page-section { padding: 5rem clamp(2rem, 6vw, 6rem); max-width: var(--container); margin: 0 auto; }
/* 全宽色带板块：背景横贯全屏，内容自动居中限宽 */
.page-section.band { width: 100%; max-width: none; }
.page-section.band-alt { background: #f5f6f8; }
.page-section.band .prod-header,
.page-section.band .prod-body,
.page-section.band .info-grid,
.page-section.band > .strategy-grid {
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
}
.page-section h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; color: #1d1d1f; margin-bottom: 1.5rem; }
.page-section h3 { font-size: 1.25rem; font-weight: 600; color: #1d1d1f; margin: 1.5rem 0 0.75rem; }
.page-section p { font-size: 1.0625rem; color: #424245; line-height: 1.9; margin-bottom: 1rem; }
.page-section .section-tag { display: inline-block; font-family: var(--f-mono); font-size: 0.75rem; color: var(--c-primary); font-weight: 600; letter-spacing: 0.1em; margin-bottom: 0.75rem; }

/* ===== 产品卡片（多页版）——大图横滑磁吸 ===== */
.product-grid {
  display: flex;
  gap: 2rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  align-items: stretch;
  padding: 0.5rem 0.25rem 1.5rem;
  scrollbar-width: thin;
  scrollbar-color: #ff6b35 rgba(0,0,0,0.06);
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 20px, #000 calc(100% - 20px), transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0, #000 20px, #000 calc(100% - 20px), transparent 100%);
}
.product-grid::-webkit-scrollbar { height: 6px; }
.product-grid::-webkit-scrollbar-thumb { background: #ff6b35; border-radius: 3px; }
.product-grid::-webkit-scrollbar-track { background: rgba(0,0,0,0.05); }
/* 等宽：flex item 是 <a>，宽度统一 */
.product-grid > .product-card-link {
  flex: 0 0 clamp(360px, 34vw, 470px);
  scroll-snap-align: center;
  display: block;
  text-decoration: none;
}
.product-card {
  background: #fff; border: 1px solid rgba(0,0,0,0.06);
  border-radius: 18px; overflow: hidden;
  transition: all 0.35s ease; box-shadow: 0 4px 20px rgba(0,0,0,0.04);
  height: 100%;
  display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-6px); box-shadow: 0 20px 48px rgba(0,0,0,0.12); border-color: rgba(25,118,210,0.25); }
.product-card-media { position: relative; overflow: hidden; }
.product-card-img { width: 100%; height: 300px; object-fit: cover; background: #f5f6f8; transition: transform 0.6s ease; display: block; }
.product-card:hover .product-card-img { transform: scale(1.06); }
/* 序号水印 */
.product-card-num {
  position: absolute; top: 12px; right: 14px;
  font-family: var(--f-mono); font-size: 1.75rem; font-weight: 700;
  color: rgba(255,255,255,0.95);
  text-shadow: 0 2px 14px rgba(0,0,0,0.35);
  letter-spacing: -0.02em;
  transition: all 0.3s;
}
.product-card:hover .product-card-num { color: #ff8a50; }
.product-card-body {
  flex: 1;
  display: flex; flex-direction: column;
  padding: 1.5rem 1.75rem 1.5rem;
}
.product-card-tag { display: inline-block; font-family: var(--f-mono); font-size: 0.6875rem; color: #1976d2; font-weight: 600; letter-spacing: 0.08em; margin-bottom: 0.6rem; }
.product-card-title { font-size: 1.375rem; font-weight: 700; color: #1d1d1f; margin-bottom: 0.6rem; transition: color 0.3s; }
.product-card:hover .product-card-title { color: #1976d2; }
.product-card-desc {
  font-size: 0.9375rem; color: #6e6e73; line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
/* 底部统一行动区：所有卡片底部对齐 */
.product-card-foot {
  margin-top: auto;
  padding-top: 1.1rem;
  display: flex; align-items: center; gap: 6px;
  border-top: 1px solid rgba(0,0,0,0.06);
  color: #1976d2;
  font-size: 0.875rem; font-weight: 600;
}
.product-card-more { transition: all 0.25s; }
.product-card-arrow { transition: transform 0.25s; }
.product-card-link:hover .product-card-more { color: #ff6b35; }
.product-card-link:hover .product-card-arrow { transform: translateX(5px); color: #ff6b35; }
.product-card-specs { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.product-card-specs span { font-size: 0.75rem; color: #1976d2; background: rgba(25,118,210,0.08); padding: 4px 10px; border-radius: 6px; font-family: var(--f-mono); }

/* ===== 信息卡片（关于/支持等） ===== */
.info-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 2rem; margin-top: 2rem; }
.info-card { background: #fff; border: 1px solid rgba(0,0,0,0.06); border-radius: 14px; padding: 2rem; transition: all 0.3s; box-shadow: 0 2px 12px rgba(0,0,0,0.03); }
.info-card:hover { box-shadow: 0 12px 32px rgba(0,0,0,0.08); transform: translateY(-2px); }
.info-card-icon { width: 48px; height: 48px; border-radius: 12px; background: linear-gradient(135deg, #1976d2, #0d47a1); color: #fff; display: flex; align-items: center; justify-content: center; margin-bottom: 1rem; }
.info-card h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 0.5rem; }
.info-card p { font-size: 0.9375rem; color: #6e6e73; line-height: 1.75; margin: 0; }

/* ===== 视频播放器 ===== */
.video-wrap { position: relative; width: min(480px, 100%); margin: 2rem auto; border-radius: 16px; overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,0.15); }
.video-wrap video { width: 100%; height: auto; display: block; background: #000; }

/* ===== 页脚 ===== */
.site-footer { background: linear-gradient(180deg, #0d2547 0%, #081630 100%); color: rgba(255,255,255,0.8); padding: 4rem clamp(2rem, 6vw, 6rem) 2rem; margin-top: 4rem; }
.footer-inner { max-width: var(--container); margin: 0 auto; display: grid; grid-template-columns: 1.2fr 2.6fr; gap: 4.5rem; align-items: start; }
.footer-brand { padding-top: 0.25rem; }
.footer-logo { width: 120px; height: auto; border-radius: 8px; background: #fff; padding: 6px 10px; margin-bottom: 1.25rem; }
.footer-company { font-size: 1.125rem; font-weight: 700; color: #fff; margin-bottom: 0.5rem; letter-spacing: 0.02em; }
.footer-desc { font-size: 0.9375rem; line-height: 1.8; opacity: 0.7; max-width: 300px; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.5rem; }
.footer-col h4 { font-size: 0.875rem; font-weight: 700; color: #fff; margin-bottom: 1.1rem; letter-spacing: 0.05em; padding-bottom: 0.6rem; border-bottom: 1px solid rgba(255,255,255,0.12); }
.footer-col a, .footer-col p { display: block; font-size: 0.8125rem; color: rgba(255,255,255,0.6); text-decoration: none; margin-bottom: 0.55rem; transition: color 0.2s; line-height: 1.6; }
.footer-col a:hover { color: #ff8a50; padding-left: 3px; }
.footer-col p svg { vertical-align: middle; margin-right: 6px; }
.footer-bottom { max-width: var(--container); margin: 2.5rem auto 0; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.1); display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer-copy { font-size: 0.8125rem; color: rgba(255,255,255,0.4); }
.footer-icp { font-size: 0.75rem; color: rgba(255,255,255,0.4); }
.footer-icp a { color: rgba(255,255,255,0.4); text-decoration: none; }
.footer-icp a:hover { color: #ff8a50; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .header-menu { display: none; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
}
@media (max-width: 768px) {
  .footer-cols { grid-template-columns: 1fr; }
  .product-grid > .product-card-link { flex-basis: min(85vw, 380px); }
  .info-grid { grid-template-columns: 1fr; }
}

/* ===== 首页专用样式（hp-* 独立类，不依赖旧 .section） ===== */
.hp-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  background: #ffffff;
  color: #1d1d1f;
  overflow: hidden;
  position: relative;
}
.hp-hero-glow {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 15% 30%, rgba(255,107,53,0.06), transparent 55%),
    radial-gradient(ellipse at 85% 70%, rgba(25,118,210,0.05), transparent 55%);
  pointer-events: none;
}
.hp-hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(2rem, 6vw, 6rem);
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 5rem;
  align-items: center;
  width: 100%;
}
.hp-kicker { font-family: var(--f-mono); font-size: 0.875rem; color: #ff6b35; font-weight: 700; letter-spacing: 0.2em; margin-bottom: 1.75rem; }
.hp-title { font-size: clamp(2.75rem, 6vw, 5.25rem); font-weight: 800; line-height: 1.08; letter-spacing: -0.03em; margin-bottom: 1.75rem; color: #1d1d1f; }
.hp-title-accent { color: #ff6b35; }
.hp-desc { font-size: 1.125rem; line-height: 1.9; color: #424245; max-width: 540px; margin-bottom: 2.5rem; }
.hp-ctas { display: flex; gap: 1rem; flex-wrap: wrap; }
.hp-btn-primary { display: inline-block; padding: 15px 36px; background: linear-gradient(135deg, #ff6b35, #ff8a50); color: #fff; border-radius: 999px; font-weight: 700; font-size: 1.0625rem; text-decoration: none; transition: all 0.3s; box-shadow: 0 12px 32px rgba(255,107,53,0.3); }
.hp-btn-primary:hover { transform: translateY(-3px); box-shadow: 0 18px 44px rgba(255,107,53,0.42); }
.hp-btn-ghost { display: inline-block; padding: 14px 32px; border: 2px solid #1d1d1f; color: #1d1d1f; border-radius: 999px; font-weight: 600; font-size: 1.0625rem; text-decoration: none; transition: all 0.3s; }
.hp-btn-ghost:hover { border-color: #ff6b35; color: #ff6b35; background: rgba(255,107,53,0.04); }
.hp-hero-visual { position: relative; display: flex; justify-content: center; }
.hp-hero-img-wrap {
  position: relative;
  max-width: 528px;
  width: 100%;
}
.hp-hero-img {
  width: 100%;
  border-radius: 28px;
  display: block;
  box-shadow: 0 40px 90px rgba(13,71,161,0.16), 0 8px 24px rgba(0,0,0,0.08);
  transform: rotate(2deg) scale(1.02);
  transition: transform 0.6s var(--ease-snappy);
}
.hp-hero-img-wrap:hover .hp-hero-img { transform: rotate(0deg) scale(1.05); }
.hp-hero-img-wrap::before {
  content: '';
  position: absolute;
  inset: -18px;
  border: 2px solid rgba(255,107,53,0.35);
  border-radius: 36px;
  z-index: -1;
  transform: rotate(-3deg);
}
.hp-hero-badge {
  position: absolute;
  bottom: 32px;
  left: -28px;
  background: #1d1d1f;
  color: #fff;
  padding: 1.1rem 1.6rem;
  border-radius: 14px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.22);
  border-left: 4px solid #ff6b35;
}
.hp-badge-num { font-size: 2.1rem; font-weight: 800; color: #ff8a50; line-height: 1; }
.hp-badge-label { font-size: 0.8125rem; color: rgba(255,255,255,0.85); margin-top: 4px; }
.hp-block { position: relative; }

/* 首页响应式 */
@media (max-width: 900px) {
  .hp-hero-inner { grid-template-columns: 1fr; gap: 3rem; }
  .hp-hero-visual { max-width: 456px; margin: 0 auto; }
}

/* ===== 产品中心优化排布 ===== */
/* 每个板块 = 一条横贯全屏的独立色带（白/灰交替），内容居中限宽 */
/* min-height 保证板块填满可视区：点击跳转后独占画面，下一板块标题不露出 */
.prod-section {
  width: 100%;
  max-width: none;
  padding: 6.5rem clamp(2rem, 6vw, 6rem);
  min-height: calc(100vh - 9.5rem);
}
.prod-section > .prod-header,
.prod-section > .prod-body {
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
}
.prod-section.alt { background: #f5f6f8; }
/* 产品中心锚点跳转：让出固定头部 + 吸顶快速导航条（scroll-padding-top 已含头部偏移） */
body[data-page="products"] section[id] { scroll-margin-top: 3.5rem; }
/* 六大板块快速导航条（吸顶，随时切换板块） */
.prod-quicknav {
  position: sticky;
  top: var(--header-h);
  z-index: 60;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  overflow-x: auto;
}
.prod-qlink {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #1d1d1f;
  text-decoration: none;
  border: 1px solid rgba(0,0,0,0.1);
  background: #fff;
  transition: all 0.25s;
  white-space: nowrap;
}
.prod-qlink .prod-qnum {
  font-family: var(--f-mono);
  font-size: 0.625rem;
  font-weight: 700;
  color: #ff6b35;
}
.prod-qlink:hover {
  border-color: #ff6b35;
  color: #ff6b35;
  background: rgba(255,107,53,0.06);
}
.prod-header {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  margin-bottom: 3.5rem;
  border-bottom: 1px solid rgba(0,0,0,0.08);
  padding-bottom: 1.75rem;
}
.prod-num {
  font-family: var(--f-mono);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: rgba(255,107,53,0.25);
  line-height: 1;
  letter-spacing: -0.03em;
}
.prod-name { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; color: #1d1d1f; }
.prod-name small { display: block; font-size: 0.8125rem; font-weight: 500; color: #6e6e73; font-family: var(--f-mono); letter-spacing: 0.08em; margin-top: 4px; }
.prod-body {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4.5rem;
  align-items: center;
}
.prod-body.reverse { grid-template-columns: 1.2fr 1fr; }
.prod-body.reverse .prod-imgs { order: 2; }
/* 无人机大图：图区占更多列宽 */
.prod-body.reverse:has(.prod-imgs.dual.large) { grid-template-columns: 1fr 1.6fr; gap: 4.5rem; }
.prod-imgs { position: relative; isolation: isolate; }
.prod-imgs.single { max-width: 460px; }
/* 单图大图模式：高能电机 */
.prod-imgs.single.large { max-width: 580px; }
.prod-body:has(.prod-imgs.single.large) { grid-template-columns: 1fr 1.25fr; gap: 4.5rem; }
.prod-imgs.dual { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
/* 大图模式：双图放大（重载无人机）——上下竖排，每张占满图区宽度 */
.prod-imgs.dual.large { grid-template-columns: 1fr; grid-template-rows: auto auto; gap: 1.5rem; }
.prod-body.reverse .prod-imgs.dual.large { max-width: 600px; }
.prod-imgs.dual.large .prod-img { border-radius: 18px; }
.prod-img {
  width: 100%;
  border-radius: 16px;
  display: block;
  box-shadow: 0 20px 50px rgba(13,71,161,0.12);
  background: #fff;
}
.prod-imgs::after {
  content: '';
  position: absolute;
  inset: -14px;
  border: 1.5px dashed rgba(25,118,210,0.25);
  border-radius: 22px;
  z-index: -1;
  pointer-events: none;
}
.prod-tag {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #ff6b35;
  background: rgba(255,107,53,0.08);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 1rem;
}
.prod-intro { font-size: 1.0625rem; color: #424245; line-height: 1.9; margin-bottom: 1.5rem; }
.prod-body h3 { font-size: 1.125rem; font-weight: 700; color: #1d1d1f; margin: 1.25rem 0 0.75rem; position: relative; padding-left: 12px; }
.prod-body h3::before { content: ''; position: absolute; left: 0; top: 4px; bottom: 4px; width: 4px; background: linear-gradient(180deg, #ff6b35, #ff8a50); border-radius: 2px; }
.prod-body p { font-size: 1rem; color: #424245; line-height: 1.85; margin-bottom: 0.875rem; }
.prod-body p strong { color: #1d1d1f; font-weight: 600; }
.prod-specs { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.75rem; }
.prod-specs span {
  font-size: 0.75rem;
  color: #1976d2;
  background: rgba(25,118,210,0.08);
  padding: 6px 14px;
  border-radius: 999px;
  font-family: var(--f-mono);
  font-weight: 500;
}
@media (max-width: 900px) {
  .prod-body, .prod-body.reverse { grid-template-columns: 1fr; gap: 2.5rem; }
  .prod-body.reverse .prod-imgs { order: 0; }
  .prod-imgs.single { max-width: 100%; }
  .prod-quicknav { justify-content: flex-start; }
  .prod-qlink { padding: 0.4rem 0.75rem; font-size: 0.75rem; }
}

/* ===== 工业节能横幅 ===== */
@media (max-width: 768px) {
  .industry-banner { padding: 4rem 1.5rem !important; }
  .industry-banner h2 { font-size: 1.75rem !important; }
}

/* ===== 首页 Hero 动态数据浮层 ===== */
.hp-stat {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: 14px;
  padding: 0.7rem 1.1rem;
  box-shadow: 0 14px 36px rgba(13,71,161,0.16);
  animation: hpFloat 4.5s ease-in-out infinite;
  z-index: 2;
}
.hp-stat .hp-stat-ico { color: #ff6b35; display: flex; }
.hp-stat .hp-stat-val { font-size: 1.0625rem; font-weight: 800; color: #1d1d1f; line-height: 1.15; }
.hp-stat .hp-stat-lab { font-size: 0.6875rem; color: #6e6e73; font-weight: 500; }
.hp-stat-1 { top: 4%; right: -5%; animation-delay: 0s; }
.hp-stat-2 { top: 40%; right: -9%; animation-delay: 1.3s; }
.hp-stat-3 { bottom: 18%; right: -4%; animation-delay: 2.4s; }
@keyframes hpFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@media (max-width: 900px) {
  .hp-stat { display: none; }
}

/* ===== 对比图表（传统电机 vs 太华盘式） ===== */
.cmp-wrap {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: stretch;
  margin: 2.5rem 0;
}
.cmp-col {
  background: #fff;
  border-radius: 18px;
  padding: 2rem 2rem 1.25rem;
  border: 1px solid rgba(0,0,0,0.08);
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
  border-top: 4px solid #c7c7cc;
}
.cmp-new {
  border-top-color: #ff6b35;
  background: linear-gradient(180deg, rgba(255,107,53,0.04), #fff 45%);
}
.cmp-col h4 {
  font-size: 1.125rem; font-weight: 700;
  margin-bottom: 1.25rem; padding-bottom: 0.9rem;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.cmp-old h4 { color: #8e8e93; }
.cmp-new h4 { color: #1d1d1f; }
.cmp-col ul { list-style: none; padding: 0; margin: 0; }
.cmp-col li {
  display: flex; gap: 0.65rem; align-items: flex-start;
  font-size: 0.9375rem; color: #424245; line-height: 1.7;
  padding: 0.55rem 0; border-bottom: 1px dashed rgba(0,0,0,0.05);
}
.cmp-col li:last-child { border-bottom: none; }
.cmp-ico {
  flex: none; width: 20px; height: 20px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  margin-top: 3px;
}
.cmp-ico.cmp-bad { background: rgba(0,0,0,0.06); color: #8e8e93; }
.cmp-ico.cmp-good { background: rgba(255,107,53,0.14); color: #ff6b35; }
.cmp-vs {
  align-self: center;
  width: 52px; height: 52px; border-radius: 50%;
  background: linear-gradient(135deg, #ff6b35, #ff8a50);
  color: #fff; font-weight: 800;
  font-family: var(--f-mono); font-size: 0.875rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 20px rgba(255,107,53,0.35);
}
@media (max-width: 900px) {
  .cmp-wrap { grid-template-columns: 1fr; }
  .cmp-vs { align-self: center; justify-self: center; }
}

/* ===== 新闻卡片（日期徽标 + hover动效） ===== */
.news-card {
  position: relative;
  background: #fff;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 14px;
  overflow: hidden;
  transition: all 0.35s ease;
}
.news-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 44px rgba(0,0,0,0.1);
  border-color: rgba(255,107,53,0.28);
}
.news-card-img { width: 100%; height: 200px; object-fit: cover; display: block; }
.news-body { padding: 1.5rem; }
.news-date {
  position: absolute;
  top: 14px; left: 14px;
  background: rgba(13,71,161,0.92);
  color: #fff;
  border-radius: 12px;
  padding: 0.5rem 0.8rem;
  text-align: center;
  line-height: 1.05;
  box-shadow: 0 8px 20px rgba(13,71,161,0.3);
  z-index: 2;
}
.news-date .nd-day { display: block; font-size: 1.25rem; font-weight: 800; font-family: var(--f-mono); }
.news-date .nd-mon { display: block; font-size: 0.625rem; opacity: 0.85; letter-spacing: 0.08em; font-family: var(--f-mono); margin-top: 2px; }
/* 无图卡片的日期徽标：右上角橙色 */
.news-date-right { left: auto; right: 14px; background: rgba(255,107,53,0.92); box-shadow: 0 8px 20px rgba(255,107,53,0.3); }
.news-cat { display: inline-block; font-family: var(--f-mono); font-size: 0.6875rem; font-weight: 600; }
.news-cat.company { color: #1976d2; }
.news-cat.industry { color: #ff6b35; }
.news-title { font-size: 1.125rem; font-weight: 700; margin: 0.5rem 0; color: #1d1d1f; }
.news-desc { font-size: 0.875rem; color: #6e6e73; line-height: 1.6; margin: 0; }

/* ===== 页脚底部（版权 + 备案，两端对齐） ===== */
@media (max-width: 768px) {
  .footer-bottom { justify-content: center; text-align: center; }
  .footer-col h4 { margin-top: 1rem; }
}

/* ===== 全站：页面过渡遮罩 + 返回顶部按钮 ===== */
#pageVeil {
  position: fixed; inset: 0;
  background: #fff;
  z-index: 99999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.32s ease;
}
#pageVeil.show { opacity: 1; pointer-events: auto; }
#backTop {
  position: fixed;
  right: 1.75rem; bottom: 2rem;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, #ff6b35, #ff8a50);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(255,107,53,0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s ease;
  z-index: 90;
}
#backTop.show { opacity: 1; visibility: visible; transform: translateY(0); }
#backTop:hover { transform: translateY(-3px); box-shadow: 0 16px 36px rgba(255,107,53,0.45); }
@media (max-width: 768px) {
  #backTop { right: 1rem; bottom: 1.25rem; width: 42px; height: 42px; }
}

/* ===== 首页公司简介：4图艺术轮播 ===== */
.about-overview { max-width: 100%; }
.about-slider {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(13,71,161,0.18);
  aspect-ratio: 4 / 3;
  background: #f5f6f8;
}
@media (max-width: 900px) {
  .about-overview { grid-template-columns: 1fr !important; gap: 2.5rem !important; }
  .about-slider { max-width: 560px; margin: 0 auto; }
}
.about-slider img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  animation: aboutFade 16s ease-in-out infinite;
}
.about-slider img:nth-child(1) { animation-delay: 0s; }
.about-slider img:nth-child(2) { animation-delay: 4s; }
.about-slider img:nth-child(3) { animation-delay: 8s; }
.about-slider img:nth-child(4) { animation-delay: 12s; }
/* 交叉淡入淡出 + 缓慢缩放（Ken Burns 效果） */
@keyframes aboutFade {
  0%   { opacity: 0; transform: scale(1.02); }
  5%   { opacity: 1; }
  22%  { opacity: 1; }
  27%  { opacity: 0; transform: scale(1.09); }
  100% { opacity: 0; transform: scale(1.02); }
}
@media (prefers-reduced-motion: reduce) {
  .about-slider img { animation: none; opacity: 1; }
  .about-slider img:nth-child(n+2) { display: none; }
}

/* ===== 子页面板块：独立完整区域（参照产品中心模式） =====
   全宽交替色带 + min-height 填满可视区（下一个板块标题不露出） */
.subpage-band {
  width: 100%;
  max-width: none;
  min-height: calc(100vh - 8rem);
}
.subpage-band > * {
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
}
/* 内容较少板块：高透明度太华电机产品样图装饰 */
.bg-decor { position: relative; overflow: hidden; }
.bg-decor::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../images/products/robot/002.jpg') right center / auto 82% no-repeat;
  opacity: 0.07;
  pointer-events: none;
}
.bg-decor > * { position: relative; z-index: 1; }
.bg-decor-motor::before { background-image: url('../images/products/motor/001.jpg'); }
.bg-decor-wind::before { background-image: url('../images/products/wind/005.jpg'); }
.bg-decor-uav::before { background-image: url('../images/products/uav/003.jpg'); }
.bg-decor-marine::before { background-image: url('../images/products/marine/001.jpg'); }

/* ===== 控股公司与产业布局：附件图背景（居中、清晰可见）+ 内容垂直居中 ===== */
#group { display: flex; flex-direction: column; justify-content: center; }
#group::before {
  background:
    linear-gradient(rgba(255,255,255,0.66), rgba(255,255,255,0.66)),
    url('../images/about/world-map.png') center / cover no-repeat;
}
/* 三个产业模块：固定三列水平居中成组 */
#group .info-grid {
  grid-template-columns: repeat(3, minmax(280px, 1fr));
  max-width: 1100px;
}
/* 文字压在背景图上：白色投影保证可读 */
#group > .section-tag, #group > h2, #group > p {
  text-shadow: 0 1px 10px rgba(255,255,255,0.9), 0 0 4px rgba(255,255,255,0.8);
}

/* ===== 核心技术优势：three.js 动态粒子背景 ===== */
.bg-three { position: relative; overflow: hidden; }
#techCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
}
.bg-three > *:not(#techCanvas) { position: relative; z-index: 1; }

/* ===== 定位理念：关节电机附件图背景（居中、透明衬托） ===== */
.bg-decor-vision::before {
  background-image: url('../images/about/vision-bg.jpg');
  background-size: auto 75%;
  background-position: center center;
}

/* ===== 人才招聘：场景附件图背景（居中、透明衬托） ===== */
.bg-decor-careers::before {
  background-image: url('../images/about/careers-bg.jpg');
  background-size: auto 75%;
  background-position: center center;
}

/* ===== 行业资讯：无人机附件图背景（居中、透明衬托） ===== */
.bg-decor-industry::before {
  background-image: url('../images/news/industry-bg.jpg');
  background-size: auto 75%;
  background-position: center center;
}

/* ===== 帮助文档：关节电机附件图背景（居中、透明衬托） ===== */
.bg-decor-docs::before {
  background-image: url('../images/support/docs-bg.jpg');
  background-size: auto 75%;
  background-position: center center;
}

/* ===== 联系信息：左图右信息排版 ===== */
.contact-info-wrap {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 3.5rem;
  align-items: center;
  margin-top: 2rem;
}
.contact-info-media img {
  width: 100%;
  border-radius: 18px;
  box-shadow: 0 24px 60px rgba(13,71,161,0.16);
  display: block;
}
.contact-info-list { display: flex; flex-direction: column; gap: 1rem; }
.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: #fff;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  box-shadow: 0 4px 16px rgba(0,0,0,0.04);
  transition: all 0.3s;
}
.contact-info-item:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(13,71,161,0.12); border-color: rgba(25,118,210,0.25); }
.contact-info-ico {
  width: 44px; height: 44px; flex-shrink: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, #1976d2, #0d47a1);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
}
.contact-info-item h3 { font-size: 1rem; font-weight: 700; color: #1d1d1f; margin-bottom: 0.3rem; }
.contact-info-item p { font-size: 0.9375rem; color: #6e6e73; line-height: 1.6; margin: 0; }
@media (max-width: 900px) {
  .contact-info-wrap { grid-template-columns: 1fr; gap: 2rem; }
}

/* ===== 行业场景大卡（Banner 下独立板块空间） ===== */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding: 5rem clamp(2rem, 6vw, 6rem);
  max-width: var(--container);
  margin: 0 auto;
}
.scenario-card {
  position: relative;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 18px;
  padding: 2.5rem 2rem;
  box-shadow: 0 8px 28px rgba(0,0,0,0.05);
  transition: all 0.35s ease;
}
.scenario-card:hover { transform: translateY(-6px); box-shadow: 0 20px 48px rgba(13,71,161,0.14); border-color: rgba(255,107,53,0.3); }
.scenario-num {
  position: absolute;
  top: 1.1rem; right: 1.4rem;
  font-family: var(--f-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: rgba(255,107,53,0.16);
  line-height: 1;
  letter-spacing: -0.03em;
}
.scenario-ico {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, #1976d2, #0d47a1);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.25rem;
  box-shadow: 0 8px 20px rgba(25,118,210,0.25);
}
.scenario-card h3 { font-size: 1.375rem; font-weight: 700; color: #1d1d1f; margin-bottom: 0.75rem; }
.scenario-card p { font-size: 1rem; color: #6e6e73; line-height: 1.8; margin: 0; }
@media (max-width: 1024px) { .scenario-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; } }
@media (max-width: 640px) { .scenario-grid { grid-template-columns: 1fr; } }

/* ===== 军工板块：居中优化 + 卡片放大 ===== */
.defense-center .prod-header { justify-content: center; }
.defense-center .prod-intro { text-align: center; max-width: 820px; margin-left: auto; margin-right: auto; }
.page-section.band.defense-center .info-grid {
  grid-template-columns: repeat(3, minmax(280px, 340px));
  justify-content: center;
  max-width: 1150px;
  gap: 2.5rem;
}
.defense-center .info-card { padding: 2.25rem; border-radius: 16px; }
.defense-center .info-card-icon { width: 54px; height: 54px; border-radius: 14px; }
.defense-center .info-card h3 { font-size: 1.25rem; }
.defense-center .info-card p { font-size: 1rem; }

/* ===== FAQ 手风琴 ===== */
.faq-list { max-width: 900px; margin: 2rem auto 0; display: flex; flex-direction: column; gap: 0.75rem; }
.faq-item {
  background: #fff;
  border: 1px solid rgba(0,0,0,0.07);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s;
}
.faq-item:hover { border-color: rgba(25,118,210,0.3); }
.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.1rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: #1d1d1f;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: '+';
  flex: none;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: rgba(25,118,210,0.1);
  color: #1976d2;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 700;
  transition: all 0.3s;
}
.faq-item[open] summary::before { content: '−'; background: #1976d2; color: #fff; }
.faq-item p {
  padding: 0 1.5rem 1.25rem 3.5rem;
  font-size: 0.9375rem;
  color: #6e6e73;
  line-height: 1.8;
  margin: 0;
}

/* ===== 技术专栏（GEO 常青内容） ===== */
.insight-card {
  background: #fff;
  border: 1px solid rgba(0,0,0,0.07);
  border-radius: 18px;
  padding: 2.25rem 2.5rem;
  margin-top: 1.5rem;
  box-shadow: 0 8px 28px rgba(0,0,0,0.05);
  transition: all 0.3s;
}
.insight-card:hover { box-shadow: 0 16px 44px rgba(13,71,161,0.12); border-color: rgba(25,118,210,0.25); transform: translateY(-3px); }
.insight-head { display: flex; align-items: center; gap: 1.25rem; margin-bottom: 1rem; }
.insight-num { font-family: var(--f-mono); font-size: 2rem; font-weight: 700; color: rgba(255,107,53,0.25); line-height: 1; }
.insight-meta { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.insight-meta time { font-family: var(--f-mono); font-size: 0.75rem; color: #1976d2; background: rgba(25,118,210,0.08); padding: 4px 12px; border-radius: 999px; }
.insight-tags { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.insight-tags i { font-style: normal; font-size: 0.6875rem; color: #ff6b35; background: rgba(255,107,53,0.08); padding: 4px 10px; border-radius: 999px; font-family: var(--f-mono); }
.insight-card h3 { font-size: 1.375rem; font-weight: 700; color: #1d1d1f; margin-bottom: 0.9rem; line-height: 1.45; }
.insight-card p { font-size: 1rem; color: #424245; line-height: 1.9; margin: 0; }

/* ===== 产品型号单页展示（中英双语切换） ===== */
.prod-sheets {
  max-width: var(--container);
  margin: 3.5rem auto 0;
}
.prod-sheets-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1d1d1f;
  margin-bottom: 1.75rem;
  padding-left: 14px;
  position: relative;
  border-bottom: 1px solid rgba(0,0,0,0.08);
  padding-bottom: 1rem;
}
.prod-sheets-title::before {
  content: '';
  position: absolute;
  left: 0; top: 3px; bottom: 20px;
  width: 4px;
  background: linear-gradient(180deg, #ff6b35, #ff8a50);
  border-radius: 2px;
}
.prod-sheets-title small {
  display: block;
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  color: #6e6e73;
  letter-spacing: 0.1em;
  margin-top: 4px;
}
.prod-sheets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 2rem;
}
.prod-sheet { margin: 0; }
.prod-sheet img {
  width: 100%;
  display: block;
  border-radius: 12px;
  transition: opacity 0.3s ease, visibility 0.3s, transform 0.35s ease, box-shadow 0.35s ease;
  box-shadow: 0 12px 32px rgba(13,71,161,0.12);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
  background: #fff;
}
.prod-sheet img:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 50px rgba(13,71,161,0.2);
}
/* 语言切换：叠放 + 透明度控制（display:none 会导致 lazy 图不加载，切换后空白） */
.prod-sheet { position: relative; }
.prod-sheet img { width: 100%; display: block; }
.prod-sheet .sheet-en { position: absolute; inset: 0; }
html[lang="en"] .prod-sheet .sheet-zh { opacity: 0; visibility: hidden; }
html:not([lang="en"]) .prod-sheet .sheet-en { opacity: 0; visibility: hidden; }
@media (max-width: 768px) {
  .prod-sheets-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 1.25rem; }
}

/* ===== 型号系列单页灯箱 ===== */
.prod-sheet { cursor: zoom-in; }
.prod-sheet:focus-visible { outline: 3px solid #1976d2; outline-offset: 3px; border-radius: 12px; }
#sheetLightbox {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s;
}
#sheetLightbox.open { opacity: 1; visibility: visible; }
.lb-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 18, 34, 0.88);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.lb-stage {
  position: relative;
  z-index: 1;
  max-width: 92vw;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  transform: scale(0.92) translateY(14px);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
#sheetLightbox.open .lb-stage { transform: scale(1) translateY(0); }
#lbImg {
  max-width: min(700px, 92vw);
  max-height: 84vh;
  object-fit: contain;
  border-radius: 14px;
  box-shadow: 0 32px 90px rgba(0,0,0,0.55);
  background: #fff;
}
.lb-close {
  position: absolute;
  top: -18px;
  right: -18px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #fff;
  color: #1d1d1f;
  font-size: 1.125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  transition: all 0.25s;
  border: none;
  z-index: 2;
}
.lb-close:hover { background: #ff6b35; color: #fff; transform: rotate(90deg); }
.lb-hint {
  margin-top: 0.9rem;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.55);
  font-family: var(--f-mono);
  letter-spacing: 0.05em;
}
@media (max-width: 768px) {
  #lbImg { max-width: 94vw; max-height: 78vh; }
  .lb-close { top: -14px; right: 0; }
}

/* ===== 首页机器人卡：中英双语图切换 ===== */
.prod-card-dual { position: relative; height: 300px; }
.prod-card-dual img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
html[lang="en"] .prod-card-dual .card-img-zh { opacity: 0; visibility: hidden; }
html:not([lang="en"]) .prod-card-dual .card-img-en { opacity: 0; visibility: hidden; }

/* ===== 产品中心：子产品独占显示 ===== */
.filtered-hidden { display: none !important; }
.prod-qlink-all .prod-qnum { color: #1976d2; }
/* 板块内"返回全部产品线"入口 */
.prod-back-all {
  margin-left: auto;
  align-self: center;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #1976d2;
  background: rgba(25,118,210,0.08);
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  text-decoration: none;
  transition: all 0.25s;
  white-space: nowrap;
}
.prod-back-all:hover { background: #1976d2; color: #fff; }

/* ===== 首页公司简介：产品展示视频（原尺寸） ===== */
.about-video {
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(13,71,161,0.18);
  background: #f5f6f8;
}
.about-video video {
  width: 100%;
  height: auto;
  display: block;
  background: #000;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
@media (max-width: 900px) {
  .about-video { max-width: 560px; margin: 0 auto; }
}

/* ===== 机器人图轮播（首页卡 + 产品中心板块主图） ===== */
.prod-card-slideshow { position: relative; height: 300px; overflow: hidden; }
.prod-card-slideshow { background: #f5f6f8; }
.prod-card-slideshow img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  animation: robotCardFade 8s ease-in-out infinite;
}
.prod-card-slideshow .slide-a { animation-delay: 0s; }
.prod-card-slideshow .slide-b { animation-delay: 4s; }
@keyframes robotCardFade {
  0%, 44%   { opacity: 1; }
  50%, 94%  { opacity: 0; }
  100%      { opacity: 1; }
}
/* 产品中心板块主图轮播 */
.prod-slideshow { position: relative; aspect-ratio: 4 / 3; overflow: hidden; border-radius: 18px; background: #fff; }
.prod-slideshow img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  animation: robotCardFade 8s ease-in-out infinite;
}
.prod-slideshow .slide-a { animation-delay: 0s; }
.prod-slideshow .slide-b { animation-delay: 4s; }
.prod-slideshow .prod-img { border-radius: 0; box-shadow: none; }
@media (prefers-reduced-motion: reduce) {
  .prod-card-slideshow img, .prod-slideshow img { animation: none; }
  .prod-card-slideshow .slide-b, .prod-slideshow .slide-b { opacity: 0; }
}