/* ============================================================
   WOTAI · 子非鱼 — Deep Ocean design system v4
   手法来源：BMW（轻字重显示标题 / 展厅节奏）、Apple（多级暗面 /
   机械感排版）、Linear（暗面分层与发光边界）
   ============================================================ */
:root {
  /* 多级暗面（Apple 式 elevation） */
  --abyss: #030d17;      /* 最深：hero、页脚 */
  --deep: #06192a;       /* 基础底 */
  --deep-2: #092236;     /* 区块交替面 */
  --deep-3: #0d2f4b;     /* 悬浮卡面 */
  --ink: #ecf5f9;
  --ink-dim: #9db8c6;
  --ink-faint: #5f7c8c;
  --accent: #4fc7e3;     /* 水母青：唯一彩色，只给交互与点睛 */
  --accent-soft: rgba(79, 199, 227, 0.14);
  --line: rgba(148, 190, 212, 0.14);
  --line-strong: rgba(148, 190, 212, 0.3);
  --card: #ffffff;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--deep);
  color: var(--ink);
  line-height: 1.8;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: #04202e; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { width: min(1280px, calc(100% - 48px)); margin: 0 auto; }

h1, h2, h3 { text-wrap: balance; }

/* ---------- header ---------- */
header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  transition: background 0.4s var(--ease-out), box-shadow 0.4s, border-color 0.4s;
  border-bottom: 1px solid transparent;
}
header.scrolled {
  background: rgba(4, 15, 25, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
nav {
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-name {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: #fff;
}
.brand-sub {
  font-size: 10.5px;
  letter-spacing: 0.34em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
nav ul {
  display: flex;
  align-items: center;
  gap: 34px;
  list-style: none;
}
nav ul a {
  font-size: 14.5px;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
  transition: color 0.25s;
  position: relative;
  padding: 6px 0;
}
nav ul a:not(.lang)::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: 0;
  height: 1px;
  background: var(--accent);
  transition: right 0.35s var(--ease-out);
}
nav ul a:not(.lang):hover::after, nav ul a.on::after { right: 0; }
nav ul a:hover, nav ul a.on { color: #fff; }
nav ul a.lang {
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 5px 15px;
  transition: 0.3s;
}
nav ul a.lang:hover { border-color: var(--accent); color: var(--accent); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 44px; height: 44px; position: relative; }
.nav-toggle span {
  position: absolute; left: 10px; right: 10px; height: 1.5px;
  background: var(--ink); transition: 0.3s;
}
.nav-toggle span:nth-child(1) { top: 16px; }
.nav-toggle span:nth-child(2) { top: 26px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { top: 21px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { top: 21px; transform: rotate(-45deg); }

/* ---------- hero：深海剧场 ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    radial-gradient(140% 100% at 78% -10%, #12466b 0%, var(--deep-2) 46%, var(--abyss) 100%);
}
/* 焦散光：缓慢漂移的天光水纹 */
.hero::before {
  content: "";
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(38% 30% at 22% 24%, rgba(79, 199, 227, 0.12), transparent 70%),
    radial-gradient(30% 26% at 70% 12%, rgba(120, 220, 240, 0.08), transparent 70%),
    radial-gradient(42% 34% at 88% 60%, rgba(38, 108, 150, 0.18), transparent 72%);
  animation: caustics 16s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes caustics {
  from { transform: translate3d(-2.5%, -1.5%, 0) scale(1); }
  to   { transform: translate3d(2.5%, 2%, 0) scale(1.06); }
}
.hero::after {
  content: "";
  position: absolute; inset: auto 0 0 0; height: 180px;
  background: linear-gradient(to bottom, transparent, var(--deep));
  pointer-events: none;
  z-index: 1;
}
.hero-slide {
  position: absolute; inset: 0;
  display: flex; align-items: center;
  opacity: 0; visibility: hidden;
  transition: opacity 1s ease, visibility 1s;
}
.hero-slide.is-active { opacity: 1; visibility: visible; position: relative; width: 100%; }
.hero-inner {
  width: min(1440px, calc(100% - 64px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  align-items: center;
  gap: 64px;
  padding-top: 72px;
  position: relative;
  z-index: 2;
}
.kicker {
  display: inline-block;
  position: relative;
  margin: 0 0 26px -48px;   /* 线悬挂在左侧负空间，文字与 H1/sub 左对齐 */
  padding-left: 48px;
  font-size: 12.5px;
  letter-spacing: 0.42em;
  color: var(--accent);
}
.kicker::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 34px; height: 1px;
  background: var(--accent);
  opacity: 0.7;
}
.hero h1 {
  font-size: clamp(38px, 5.6vw, 72px);
  line-height: 1.16;
  font-weight: 250;
  letter-spacing: 0.06em;
  color: #fff;
}
.hero .sub {
  margin-top: 24px;
  font-size: 16.5px;
  color: var(--ink-dim);
  max-width: 30em;
  letter-spacing: 0.04em;
}
.hero-cta { margin-top: 40px; display: flex; gap: 16px; flex-wrap: wrap; }

.btn-primary, .btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 34px;
  border-radius: 999px;
  font-size: 14.5px;
  letter-spacing: 0.14em;
  transition: 0.35s var(--ease-out);
  min-height: 44px;
}
.btn-primary {
  background: var(--accent);
  color: #04202e;
  font-weight: 600;
  box-shadow: 0 8px 28px rgba(79, 199, 227, 0.32);
}
.btn-primary:hover { background: #7ad9f0; transform: translateY(-2px); box-shadow: 0 12px 34px rgba(79, 199, 227, 0.42); }
.btn-ghost { border: 1px solid var(--line-strong); color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* 圆形观景窗：发光展台 */
.porthole {
  position: relative;
  width: min(520px, 92%);
  aspect-ratio: 1;
  margin-left: auto;
  border-radius: 50%;
  background: #fbfdfd;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.12),
    0 0 0 12px rgba(79, 199, 227, 0.07),
    0 30px 90px rgba(0, 0, 0, 0.55),
    0 0 110px rgba(79, 199, 227, 0.28);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.porthole img { width: 88%; height: 88%; object-fit: contain; }
.porthole-photo img { width: 100%; height: 100%; object-fit: cover; }
/* 气泡 */
.bubbles { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.bubbles i {
  position: absolute;
  bottom: -40px;
  border-radius: 50%;
  border: 1px solid rgba(159, 214, 232, 0.4);
  background: linear-gradient(135deg, rgba(159, 214, 232, 0.14), rgba(159, 214, 232, 0.03));
  animation: rise linear infinite;
}
@keyframes rise {
  from { transform: translateY(0) translateX(0); opacity: 0; }
  8% { opacity: 1; }
  50% { transform: translateY(-55vh) translateX(14px); }
  to { transform: translateY(-110vh) translateX(-8px); opacity: 0; }
}

.hero-dots {
  position: absolute;
  bottom: 38px; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 10px;
  z-index: 5;
}
.hero-dots button {
  width: 36px; height: 2px;
  border: 0; border-radius: 2px;
  background: rgba(159, 200, 220, 0.25);
  cursor: pointer;
  transition: 0.4s var(--ease-out);
  padding: 0;
}
.hero-dots button.on { background: var(--accent); width: 52px; }

/* ---------- 编辑式分节头：左对齐，打破居中单调 ---------- */
.band { padding: 108px 0; }
.band-tint { background: var(--deep-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.center { text-align: center; }
.center .sub { margin-left: auto; margin-right: auto; }
.center .kicker { margin-left: 0; padding-left: 0; }
.center .kicker::before { display: none; }

.sec-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 56px;
}
.sec-head h2 {
  font-size: clamp(27px, 3.4vw, 42px);
  font-weight: 300;
  letter-spacing: 0.05em;
  color: #fff;
  line-height: 1.3;
}
.sec-head .kicker { margin-bottom: 14px; }
.sec-head .more {
  flex: none;
  font-size: 13.5px;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  transition: 0.3s;
  padding-bottom: 6px;
  white-space: nowrap;
}
.sec-head .more:hover { color: var(--accent); }

h2 {
  font-size: clamp(27px, 3.4vw, 42px);
  font-weight: 300;
  letter-spacing: 0.05em;
  color: #fff;
  line-height: 1.3;
}
.sub {
  margin-top: 16px;
  color: var(--ink-dim);
  font-size: 15.5px;
  max-width: 42em;
}

/* 数字信任条 */
/* 产品分类卡：白瓷卡 */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.cat-card {
  position: relative;
  display: block;
  border-radius: 16px;
  overflow: hidden;
  background: var(--card);
  transition: transform 0.5s var(--ease-out), box-shadow 0.5s var(--ease-out);
}
.cat-card:hover { transform: translateY(-8px); box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(79, 199, 227, 0.35); }
.cat-card .thumb {
  aspect-ratio: 1;
  background: #f2f7f9;
  overflow: hidden;
}
.cat-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.8s var(--ease-out); }
.cat-card:hover .thumb img { transform: scale(1.07); }
.cat-card .meta { padding: 18px 20px 22px; }
.cat-card .meta .no {
  font-size: 10.5px;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
}
.cat-card .meta h3 { margin-top: 6px; font-size: 17.5px; color: #0b2233; font-weight: 600; letter-spacing: 0.05em; }
.cat-card .meta p { margin-top: 3px; font-size: 12.5px; color: #8aa2b0; }


/* 黑底产品图变体：黑容器融合黑底图，完整显示荧光主体 */
.prod-card.dark, .cat-card.dark { background: #05070c; }
.prod-card.dark .thumb, .cat-card.dark .thumb { background: #05070c; }
.prod-card.dark .thumb img, .cat-card.dark .thumb img { object-fit: contain; }
.prod-card.dark .meta { background: #05070c; border-top: 1px solid rgba(255,255,255,0.07); }
.prod-card.dark .meta h3 { color: #f0f6fa; }
.prod-card.dark .meta .en { color: #5f7c8c; }
.cat-card.dark .meta { background: #05070c; border-top: 1px solid rgba(255,255,255,0.07); }
.cat-card.dark .meta h3 { color: #f0f6fa; }
.cat-card.dark .meta p { color: #5f7c8c; }
.prod-card.dark:hover, .cat-card.dark:hover { box-shadow: 0 30px 60px rgba(0,0,0,0.6), 0 0 0 1px rgba(79,199,227,0.45); }
/* 场景条/详情区黑底图容器 */
.scene-strip figure.dark, .detail-grid figure.dark { background: #05070c; }
.detail-grid figure.dark img { object-fit: contain; }

/* Bento：核心产品，主次分明（featured 2x2 + 横幅卡，总格数保持 4 的倍数） */
.bento {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.bento .prod-card { grid-column: span 1; }
.bento .prod-card.featured { grid-column: span 2; grid-row: span 2; display: flex; flex-direction: column; }
.bento .prod-card.featured .thumb { aspect-ratio: auto; flex: 1; min-height: 320px; }
.bento .prod-card.featured .meta h3 { font-size: 17px; }
.bento .prod-card.span2 { grid-column: span 2; }
.bento .prod-card.span2 .thumb { aspect-ratio: 2/1; }

.prod-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.prod-card {
  background: var(--card);
  border-radius: 14px;
  overflow: hidden;
  transition: transform 0.45s var(--ease-out), box-shadow 0.45s var(--ease-out);
}
.prod-card:hover { transform: translateY(-6px); box-shadow: 0 24px 50px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(79, 199, 227, 0.3); }
.prod-card .thumb { aspect-ratio: 1; background: #f2f7f9; overflow: hidden; }
.prod-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.7s var(--ease-out); }
.prod-card:hover .thumb img { transform: scale(1.06); }
.prod-card .meta { padding: 15px 18px 19px; }
.prod-card .no { font-size: 10.5px; letter-spacing: 0.24em; color: var(--accent); font-variant-numeric: tabular-nums; }
.prod-card h3 { margin-top: 4px; font-size: 15px; color: #0b2233; font-weight: 600; letter-spacing: 0.03em; line-height: 1.5; }
.prod-card .en { margin-top: 2px; font-size: 11.5px; color: #8aa2b0; letter-spacing: 0.02em; }

/* 招牌产品 split */

/* 品牌区：深海殿堂 */
.brand-band {
  text-align: center;
  padding: 130px 0;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(70% 90% at 50% 130%, rgba(79, 199, 227, 0.15) 0%, transparent 62%),
    radial-gradient(40% 55% at 50% -20%, rgba(120, 220, 240, 0.07) 0%, transparent 60%),
    var(--abyss);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.brand-band .zhi {
  font-size: clamp(42px, 6.4vw, 84px);
  font-weight: 200;
  letter-spacing: 0.32em;
  text-indent: 0.32em;
  color: #fff;
}
.brand-band .en-name {
  margin-top: 14px;
  font-size: 13px;
  letter-spacing: 0.62em;
  text-indent: 0.62em;
  color: var(--accent);
  text-transform: uppercase;
}
.brand-band blockquote {
  margin: 40px auto 0;
  max-width: 36em;
  font-size: 16px;
  color: var(--ink-dim);
  line-height: 2.1;
  letter-spacing: 0.05em;
}
.brand-band blockquote cite {
  display: block;
  margin-top: 14px;
  font-style: normal;
  font-size: 12.5px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
}
.brand-logo-mark {
  width: 120px;
  margin: 48px auto 0;
  border-radius: 16px;
  opacity: 0.92;
}

/* 业务卡：去框化，编号大字+顶线 */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}
.biz-card {
  display: block;
  padding: 38px 26px 42px;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  position: relative;
  transition: background 0.4s var(--ease-out);
}
.biz-card:first-child { border-left: 1px solid var(--line); }
.biz-card::before {
  content: "";
  position: absolute;
  top: -1px; left: 0; right: 100%;
  height: 2px;
  background: var(--accent);
  transition: right 0.45s var(--ease-out);
}
.biz-card:hover::before { right: 0; }
.biz-card:hover { background: rgba(79, 199, 227, 0.05); }
.biz-card .no {
  font-size: 30px;
  font-weight: 200;
  color: var(--accent);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  opacity: 0.9;
}
.biz-card h3 { margin-top: 14px; font-size: 19px; color: #fff; letter-spacing: 0.1em; font-weight: 500; }
.biz-card p { margin-top: 10px; font-size: 13.5px; color: var(--ink-faint); line-height: 1.9; }

/* 资质条 */
.cert-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 14px;
  margin-top: 0;
}
.cert-strip a {
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 3/4;
  background: #fff;
  transition: 0.4s var(--ease-out);
}
.cert-strip a:hover { border-color: rgba(79, 199, 227, 0.55); transform: translateY(-4px); }
.cert-strip img { width: 100%; height: 100%; object-fit: cover; }

/* 产品详情区 */
.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 430px));
  gap: 22px;
  justify-content: center;
}
.detail-grid figure {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  transition: 0.45s var(--ease-out);
  aspect-ratio: 4/5;
  display: flex;
  align-items: center;
  justify-content: center;
}
.detail-grid figure:hover { transform: translateY(-5px); border-color: rgba(79, 199, 227, 0.4); }
.detail-grid img { width: 100%; height: 100%; object-fit: contain; }
.scene-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  margin-top: 22px;
}
.scene-strip figure {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  aspect-ratio: 1;
  background: #fff;
  overflow: hidden;
}
.scene-strip figure img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.7s var(--ease-out); }
.scene-strip figure:hover img { transform: scale(1.08); }


/* 品牌视觉墙：老站原版横幅全幅轮播 */
.banner-band {
  position: relative;
  overflow: hidden;
  background: var(--abyss);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.banner-slide {
  display: none;
  width: 100%;
}
.banner-slide.is-active { display: block; animation: bannerIn 0.7s var(--ease-out); }
@keyframes bannerIn { from { opacity: 0; } to { opacity: 1; } }
.banner-slide img { width: 100%; height: auto; display: block; }
.banner-band .banner-dots {
  position: absolute;
  bottom: 14px; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 8px;
  z-index: 3;
}
.banner-band .banner-dots button {
  width: 26px; height: 2px;
  border: 0; border-radius: 2px;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: 0.3s;
  padding: 0;
}
.banner-band .banner-dots button.on { background: #fff; width: 40px; }


/* 数字信任条（v1 布局） */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat {
  text-align: center;
  padding: 34px 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.02);
}
.stat .n {
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.02em;
}
.stat p { margin-top: 8px; color: var(--ink-dim); font-size: 14px; letter-spacing: 0.06em; }

/* 招牌产品 split（v1 布局） */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.split .copy h2 { margin-bottom: 0; }
@media (max-width: 960px) {
  .split { grid-template-columns: 1fr; gap: 28px; }
  .split .photo { display: flex; justify-content: center; padding: 0 8px; }
  .split .photo .porthole { margin: 0 auto; }
  .split .copy { text-align: left; }
}
.feature-list { margin-top: 28px; list-style: none; }
.feature-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 15.5px;
  display: flex; gap: 14px; align-items: baseline;
}
.feature-list li::before {
  content: "\25C8";
  color: var(--accent);
  flex: none;
}
.feature-list li b { color: var(--ink); font-weight: 600; }
.split .photo .porthole { margin-left: 0; }
.fine { margin-top: 18px; font-size: 13px; color: rgba(157, 184, 198, 0.65); }

.porthole-wide {
  border-radius: 24px;
  aspect-ratio: auto;
  height: min(420px, 60vw);
  width: 100%;
  overflow: hidden;
}
.porthole-wide img { width: 100%; height: 100%; object-fit: cover; }


/* Hero 多圆星系：不同形状水母缸错落悬浮 */
.hero-orbits {
  position: relative;
  height: 640px;
  width: 100%;
}
.orbit-c {
  position: absolute;
  border-radius: 50%;
  background: #fdfdfd;
  box-shadow:
    0 0 0 8px rgba(79, 199, 227, 0.10),
    0 24px 60px rgba(0, 0, 0, 0.45),
    0 0 60px rgba(79, 199, 227, 0.22);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: orbitFloat 7s ease-in-out infinite;
}
.orbit-c img {
  width: 86%;
  height: 86%;
  object-fit: contain;
}
.orbit-c .orbit-tag {
  position: absolute;
  bottom: 9%;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: #6b8494;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.orbit-c1 { width: 470px; height: 470px; right: 2%; top: 80px; animation-delay: 0s; }
.orbit-c2 { width: 280px; height: 280px; left: 4%; top: 0; animation-delay: -2.2s; }
.orbit-c3 { width: 225px; height: 225px; left: 26%; bottom: 10px; animation-delay: -4.1s; }
.orbit-c4 { width: 165px; height: 165px; right: 560px; bottom: 170px; animation-delay: -1.3s; }
@keyframes orbitFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}


/* Hero 四菱形：尖角中心相接（X 分界），流式缩放，标签相对菱形定位 */
.hero-diamond-frame {
  position: relative;
  width: 640px;
  max-width: 100vw;
  aspect-ratio: 1;
  margin: 0 auto;
}
.dm-d {
  position: absolute;
  width: 50%;
  aspect-ratio: 1;
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  background: #000;
  overflow: hidden;
  animation: orbitFloat 7s ease-in-out infinite;
  filter: drop-shadow(0 14px 30px rgba(0, 0, 0, 0.55)) drop-shadow(0 0 24px rgba(79, 199, 227, 0.15));
}
.dm-d:nth-child(1) { animation-delay: 0s; }
.dm-d:nth-child(2) { animation-delay: -2.3s; }
.dm-d:nth-child(3) { animation-delay: -4.6s; }
.dm-d:nth-child(4) { animation-delay: -1.2s; }
.dm-d img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.dm-d .dm-tag {
  position: absolute;
  bottom: 11%;
  left: 50%;
  transform: translateX(-50%);
  font-size: clamp(9px, 1.9vw, 11.5px);
  letter-spacing: 0.12em;
  color: #e8f2f8;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.9);
  z-index: 2;
}
.dm-top { left: 25%; top: 0; }
.dm-right { left: 50%; top: 25%; }
.dm-bottom { left: 25%; top: 50%; }
.dm-left { left: 0; top: 25%; }


.cta-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.02);
  margin-top: 20px;
}
.cta-card h3 { font-size: 18px; color: #fff; letter-spacing: 0.05em; font-weight: 500; }
.cta-card p { margin: 10px 0 18px; font-size: 14px; color: var(--ink-dim); }
.cta-card .btn-primary, .cta-card .btn-ghost { padding: 11px 26px; font-size: 13.5px; }

/* CTA *//* CTA *//* CTA *//* CTA *//* CTA */

.cta-band {
  text-align: center;
  padding: 120px 0;
  position: relative;
  overflow: hidden;
  background: radial-gradient(70% 100% at 50% 110%, rgba(79, 199, 227, 0.13) 0%, transparent 62%);
}
.contact-lines {
  margin-top: 38px;
  display: flex;
  justify-content: center;
  gap: 20px 48px;
  flex-wrap: wrap;
  font-size: 15.5px;
  letter-spacing: 0.03em;
}
.contact-lines a { color: var(--accent); transition: 0.25s; }
.contact-lines a:hover { color: #7ad9f0; }
.contact-lines span { color: var(--ink-faint); }
.qr-slot { margin-top: 42px; }
.qr-slot img {
  width: 124px;
  margin: 0 auto;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
}
.qr-slot p { margin-top: 12px; font-size: 12.5px; color: var(--ink-faint); letter-spacing: 0.2em; }

/* footer：三栏 */
footer {
  background: var(--abyss);
  border-top: 1px solid var(--line);
  padding: 64px 0 0;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 52px;
}
.foot-brand .brand { margin-bottom: 18px; }
.foot-brand p { font-size: 13.5px; color: var(--ink-faint); max-width: 26em; line-height: 2; }
.foot-col h4 {
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: 20px;
  font-weight: 500;
}
.foot-col ul { list-style: none; }
.foot-col li { margin-bottom: 11px; }
.foot-col a, .foot-col span { font-size: 14px; color: var(--ink-dim); transition: 0.25s; }
.foot-col a:hover { color: var(--accent); }
.foot-bar {
  border-top: 1px solid var(--line);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}
.foot-bar a { color: var(--ink-faint); }
.foot-bar a:hover { color: var(--accent); }

/* ---------- 产品页 ---------- */
.page-head { padding: 168px 0 46px; }
.page-head h2 { max-width: 22em; }
.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 34px 0 52px;
}
.filter-bar button {
  padding: 10px 24px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: none;
  color: var(--ink-dim);
  font-size: 13.5px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: 0.3s var(--ease-out);
  min-height: 40px;
}
.filter-bar button.on, .filter-bar button:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- 关于页 ---------- */
.about-photo {
  border-radius: 18px;
  overflow: hidden;
  margin-top: 56px;
  border: 1px solid var(--line);
}
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
}
.cert-grid figure {
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
  aspect-ratio: 3/4;
  transition: 0.4s var(--ease-out);
}
.cert-grid figure:hover { border-color: rgba(79, 199, 227, 0.5); transform: translateY(-4px); }
.cert-grid img { width: 100%; height: 100%; object-fit: contain; padding: 6px; }

/* ---------- 业务页 ---------- */
.biz-block {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  padding: 60px 0;
  border-bottom: 1px solid var(--line);
}
.biz-block:last-of-type { border-bottom: 0; }
.biz-block .tag { font-size: 11.5px; letter-spacing: 0.36em; color: var(--accent); text-transform: uppercase; }
.biz-block h3 { margin-top: 14px; font-size: clamp(22px, 2.6vw, 30px); color: #fff; letter-spacing: 0.06em; font-weight: 400; }
.biz-block ul { list-style: none; }
.biz-block ul li {
  padding: 15px 0 15px 26px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 14.5px;
  position: relative;
  line-height: 1.9;
}
.biz-block ul li::before { content: "◈"; position: absolute; left: 0; color: var(--accent); font-size: 12px; }
.biz-block ul li b { color: var(--ink); font-weight: 600; }

/* ---------- 联系页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.contact-rows { list-style: none; margin-top: 8px; }
.contact-rows li {
  display: flex;
  gap: 20px;
  padding: 19px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.contact-rows .k { flex: none; width: 5.5em; color: var(--ink-faint); letter-spacing: 0.14em; }
.contact-rows .v { color: var(--ink); }
.contact-rows .v a { color: var(--accent); }
.map-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}
.map-card img { width: 100%; }
.qr-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 30px;
  text-align: center;
  background: rgba(255, 255, 255, 0.02);
}
.qr-card + .qr-card { margin-top: 20px; }
.qr-card img { width: 140px; margin: 0 auto 14px; border-radius: 10px; }
.qr-card p { font-size: 13px; color: var(--ink-dim); letter-spacing: 0.16em; }

/* reveal：仅 JS 可用时隐藏 */
html.js .reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out); }
html.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html.js .reveal { opacity: 1; transform: none; }
}

.back-top {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(6, 25, 42, 0.88);
  backdrop-filter: blur(8px);
  color: var(--accent);
  font-size: 17px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: 0.35s var(--ease-out);
  z-index: 40;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { border-color: var(--accent); transform: translateY(-3px); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  /* 平板及以下统一走汉堡菜单，避免中间宽度挤压换行 */
  .nav-toggle { display: block; }
  .hero-orbits { height: calc(92vw); }
  .orbit-c1 { width: 100%; height: auto; aspect-ratio: 1; right: 0; transform: none; top: 2vw; animation: none; }
  .orbit-c2, .orbit-c3, .orbit-c4 { display: none; }
  nav ul {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    gap: 0;
    background: rgba(4, 15, 25, 0.98);
    border-bottom: 1px solid var(--line);
    display: none;
  }
  nav ul.open { display: flex; }
  nav ul li { width: 100%; text-align: center; }
  nav ul a { display: block; padding: 17px 0; }
  nav ul a:not(.lang)::after { display: none; }
  nav ul a.lang { margin: 14px auto 20px; }
  .brand { white-space: nowrap; }
  .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .biz-grid { grid-template-columns: repeat(3, 1fr); }
  .biz-card:nth-child(3n+1) { border-left: 1px solid var(--line); }
  .biz-card:first-child { border-left: 1px solid var(--line); }
  .prod-grid { grid-template-columns: repeat(3, 1fr); }
  .cert-strip, .cert-grid { grid-template-columns: repeat(4, 1fr); }
  .scene-strip { grid-template-columns: repeat(3, 1fr); }
  .detail-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-inner { grid-template-columns: 1fr; gap: 36px; padding-top: 118px; padding-bottom: 76px; }
  .porthole { margin: 0 auto; }
  .biz-block { grid-template-columns: 1fr; gap: 22px; }
  .sec-head { flex-direction: column; align-items: flex-start; gap: 10px; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .biz-grid { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .stat { padding: 22px 8px; }
  .stat .n { font-size: clamp(20px, 6vw, 26px); }
  .stat p { font-size: 12.5px; line-height: 1.6; }
  /* 全流式：任意手机宽度不溢出 */
  .hero-orbits, .hero-diamond-frame { transform-origin: center; }
  .contact-lines { gap: 12px 20px; padding: 0 4px; }
  .contact-lines a, .contact-lines span { font-size: 14px; word-break: break-all; }
  .qr-card img { width: min(38vw, 140px); }
  .qr-slot img { width: min(30vw, 124px); }
  .map-card, .qr-card { max-width: 100%; }
  .about-photo { margin-left: 0; margin-right: 0; }
  .cert-strip, .cert-grid { gap: 10px; }
  .foot-col li span, .foot-brand p { word-break: break-word; }
  .biz-card { border-left: 1px solid var(--line) !important; }
  .biz-card:nth-child(-n+2) { border-top: 1px solid var(--line); }
  .biz-card:nth-child(odd) { border-left: 0 !important; }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-strip, .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .scene-strip { grid-template-columns: repeat(2, 1fr); }
  .detail-grid { grid-template-columns: 1fr; }
  .band { padding: 72px 0; }
  .brand-band { padding: 96px 0; }

  .brand-band .zhi { letter-spacing: 0.18em; text-indent: 0.18em; }
  .kicker { margin-left: 0; padding-left: 0; }
  .kicker::before { display: none; }
  .foot-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero { min-height: 100svh; }
}
@media (max-width: 374px) {
  .stats { grid-template-columns: 1fr; }
  .stat .n { font-size: 22px; }
}