/* ==========================================================================
   云帆智能 · 官网样式
   北京云帆航信科技有限公司
   设计基调：深海军蓝 + 单一品牌蓝，深浅分区，非对称布局
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
  --ink: #0a1a2f;          /* 深海军蓝（暗部背景） */
  --ink-2: #0e2440;        /* 暗部卡片 */
  --ink-3: #08121f;        /* 页脚 */
  --paper: #f5f8fc;        /* 亮部背景 */
  --card: #ffffff;
  --accent: #1d5bd6;       /* 品牌蓝 */
  --accent-deep: #1546a8;
  --accent-soft: #e8f0fe;
  --sky: #5ea8ff;
  --cyan: #7dd3fc;
  --text: #14213a;
  --text-2: #3d4f6b;
  --muted: #5a6b82;
  --muted-dark: #8ba3c2;   /* 暗部次级文字 */
  --line: #dfe7f1;
  --line-dark: rgba(255, 255, 255, 0.1);

  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 10px;

  --shadow-sm: 0 1px 2px rgba(10, 26, 47, 0.06), 0 4px 12px rgba(10, 26, 47, 0.05);
  --shadow-md: 0 2px 6px rgba(10, 26, 47, 0.07), 0 16px 40px rgba(10, 26, 47, 0.09);

  --font: "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Source Han Sans SC",
          "Noto Sans SC", "Microsoft YaHei", "Segoe UI", sans-serif;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --header-h: 72px;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p, dl, dd, dt, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }

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

::selection { background: rgba(29, 91, 214, 0.18); }

[id] { scroll-margin-top: calc(var(--header-h) + 16px); }

.container {
  width: min(1180px, 100% - 48px);
  margin-inline: auto;
}

/* ---------- 通用：区块头 ---------- */
.section { padding: 104px 0; }

.section-head { max-width: 640px; margin-bottom: 56px; }

.section-eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--text);
}

.section-desc {
  margin-top: 16px;
  color: var(--muted);
  font-size: 16px;
}

/* ---------- 通用：按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out),
              background-color 0.25s, color 0.25s, border-color 0.25s;
  will-change: transform;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 24px rgba(29, 91, 214, 0.35);
}

.btn-primary:hover {
  background: var(--accent-deep);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(29, 91, 214, 0.42);
}

.btn-ghost {
  color: #dce8fb;
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(6px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.45);
  transform: translateY(-2px);
}

.btn-light {
  background: #fff;
  color: var(--accent);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.btn-light:hover { transform: translateY(-2px); }

.btn-block { width: 100%; }

/* ==========================================================================
   顶部导航
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  transition: background-color 0.35s, box-shadow 0.35s, border-color 0.35s;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(10, 26, 47, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 30px rgba(5, 12, 24, 0.35);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark { flex: none; }

.brand-text { display: flex; flex-direction: column; line-height: 1.25; }

.brand-text strong {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
}

.brand-text small {
  font-size: 11px;
  color: rgba(220, 232, 251, 0.66);
  letter-spacing: 0.04em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 15px;
  color: rgba(220, 232, 251, 0.82);
  transition: color 0.25s, background-color 0.25s;
}

.nav-link:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }

.nav-link.is-active { color: #fff; background: rgba(255, 255, 255, 0.1); }

.nav-cta {
  margin-left: 10px;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 18px rgba(29, 91, 214, 0.4);
}

.nav-cta:hover { background: var(--accent-deep); color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 10px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.3s var(--ease-out), opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1100px 520px at 82% -10%, #123055 0%, transparent 60%),
    linear-gradient(180deg, #0b1e36 0%, var(--ink) 60%, #0a1a2f 100%);
  color: #fff;
  padding: calc(var(--header-h) + 84px) 0 0;
}

.hero-bg { position: absolute; inset: 0; pointer-events: none; }

.aurora {
  position: absolute;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}

.aurora-a {
  background: radial-gradient(circle, rgba(29, 91, 214, 0.55), transparent 65%);
  top: -180px;
  left: -140px;
  animation: drift 16s ease-in-out infinite alternate;
}

.aurora-b {
  background: radial-gradient(circle, rgba(94, 168, 255, 0.32), transparent 65%);
  bottom: -220px;
  right: -120px;
  animation: drift 20s ease-in-out infinite alternate-reverse;
}

@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(50px, 34px, 0) scale(1.12); }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(720px 520px at 68% 30%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(720px 520px at 68% 30%, #000 0%, transparent 78%);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 64px;
  align-items: center;
  padding-bottom: 84px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(6px);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: #cfe0f7;
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(125, 211, 252, 0.18);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(125, 211, 252, 0.14); }
  50%      { box-shadow: 0 0 0 7px rgba(125, 211, 252, 0.05); }
}

.hero-title {
  margin-top: 26px;
  font-size: clamp(32px, 4.6vw, 54px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: 0.005em;
}

.hero-title em {
  font-style: normal;
  background: linear-gradient(92deg, #6ea6ff 0%, #7dd3fc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin-top: 22px;
  max-width: 34em;
  font-size: 16.5px;
  line-height: 1.9;
  color: rgba(210, 226, 246, 0.85);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0 48px;
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.stat dt {
  font-size: 34px;
  font-weight: 700;
  color: #fff;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.stat dd {
  margin-top: 6px;
  font-size: 13.5px;
  color: rgba(190, 210, 235, 0.72);
  letter-spacing: 0.05em;
}

/* --- Hero 右侧分层架构示意 --- */
.hero-visual { position: relative; }

.stack {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 30px 60px rgba(3, 10, 22, 0.5);
  backdrop-filter: blur(10px);
}

.stack-layer {
  position: relative;
  border-radius: var(--radius-md);
  padding: 18px 20px;
  background: rgba(12, 30, 56, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.layer-tag {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: rgba(190, 212, 240, 0.65);
  margin-bottom: 10px;
}

.layer-title {
  font-size: 15px;
  color: #eaf2fd;
  letter-spacing: 0.02em;
}

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13px;
  color: #e6effc;
  background: rgba(29, 91, 214, 0.28);
  border: 1px solid rgba(125, 165, 255, 0.35);
  animation: floaty 5s ease-in-out infinite;
}

.chip:nth-child(2) { animation-delay: 0.5s; }
.chip:nth-child(3) { animation-delay: 1s; }
.chip:nth-child(4) { animation-delay: 1.5s; }
.chip:nth-child(5) { animation-delay: 2s; }

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-4px); }
}

.layer-agent { animation: floaty 7s ease-in-out infinite; }

.layer-base {
  background: linear-gradient(140deg, rgba(29, 91, 214, 0.38), rgba(12, 30, 56, 0.7));
  border-color: rgba(125, 165, 255, 0.4);
}

.base-glow {
  position: absolute;
  inset: auto -20% -60% -20%;
  height: 90px;
  background: radial-gradient(closest-side, rgba(94, 168, 255, 0.35), transparent);
  pointer-events: none;
}

.stack-link {
  display: flex;
  justify-content: space-around;
  padding: 0 24%;
}

.stack-link span {
  width: 2px;
  height: 16px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(125, 165, 255, 0.7), rgba(125, 165, 255, 0.15));
}

.float-badge {
  position: absolute;
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: #eaf2fd;
  background: rgba(14, 36, 64, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 10px 26px rgba(3, 10, 22, 0.45);
  backdrop-filter: blur(8px);
  animation: floaty 6s ease-in-out infinite;
}

.badge-1 { top: -18px; right: 26px; }
.badge-2 { bottom: 96px; left: -26px; animation-delay: 1.2s; }
.badge-3 { bottom: -16px; right: -12px; animation-delay: 2.4s; }

/* --- 关键词滚动 --- */
.marquee-wrap {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(6, 16, 32, 0.5);
}

.marquee {
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}

.marquee-track {
  display: flex;
  align-items: center;
  gap: 28px;
  width: max-content;
  padding: 18px 0;
  animation: marquee 34s linear infinite;
}

.marquee-track span {
  font-size: 14px;
  letter-spacing: 0.14em;
  color: rgba(190, 212, 240, 0.66);
  white-space: nowrap;
}

.marquee-track i {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(125, 165, 255, 0.5);
  flex: none;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ==========================================================================
   场景解决方案
   ========================================================================== */
.scenes { background: var(--paper); }

.scene-tabs {
  display: grid;
  grid-template-columns: 264px 1fr;
  gap: 28px;
  align-items: start;
}

.scene-tablist {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: sticky;
  top: calc(var(--header-h) + 24px);
}

.scene-tab {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  border-radius: var(--radius-md);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text-2);
  background: transparent;
  border: 1px solid transparent;
  text-align: left;
  transition: background-color 0.25s, color 0.25s, border-color 0.25s, transform 0.25s var(--ease-out);
}

.scene-tab svg { flex: none; opacity: 0.8; }

.scene-tab:hover { background: #fff; border-color: var(--line); }

.scene-tab.is-active {
  background: var(--card);
  border-color: var(--line);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
  transform: translateX(6px);
}

.scene-tab.is-active svg { opacity: 1; }

.scene-panel {
  display: none;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.scene-panel.is-active { display: block; animation: panelIn 0.45s var(--ease-out); }

@keyframes panelIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: none; }
}

.scene-intro h3 {
  font-size: 23px;
  font-weight: 700;
  color: var(--text);
}

.scene-intro h3::after {
  content: "";
  display: block;
  width: 44px;
  height: 3px;
  margin-top: 14px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent), var(--sky));
}

.scene-intro p {
  margin-top: 16px;
  color: var(--muted);
  max-width: 56ch;
}

.scene-list {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.scene-list li {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fbfdff;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s var(--ease-out);
}

.scene-list li:hover {
  border-color: rgba(29, 91, 214, 0.35);
  box-shadow: var(--shadow-sm);
  transform: translateY(-3px);
}

.scene-list h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  padding-left: 14px;
  position: relative;
}

.scene-list h4::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.scene-list p {
  margin-top: 8px;
  font-size: 14.5px;
  color: var(--muted);
}

/* ==========================================================================
   技术底座（暗部 Bento）
   ========================================================================== */
.section-dark {
  background:
    radial-gradient(900px 420px at 15% 0%, #102a4c 0%, transparent 55%),
    var(--ink);
  color: #eaf2fd;
}

.section-dark .section-title { color: #fff; }
.section-dark .section-desc { color: var(--muted-dark); }
.section-dark .section-eyebrow { color: var(--sky); }

.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.bento-card {
  position: relative;
  padding: 30px 28px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: transform 0.35s var(--ease-out), border-color 0.35s, background-color 0.35s;
  overflow: hidden;
}

.bento-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(420px 200px at var(--mx, 50%) -20%, rgba(94, 168, 255, 0.16), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}

.bento-card:hover {
  transform: translateY(-4px);
  border-color: rgba(125, 165, 255, 0.4);
  background: rgba(255, 255, 255, 0.065);
}

.bento-card:hover::after { opacity: 1; }

.bento-lg { grid-column: span 2; }
.bento-accent { grid-column: span 2; background: linear-gradient(135deg, rgba(29, 91, 214, 0.32), rgba(255, 255, 255, 0.04)); border-color: rgba(125, 165, 255, 0.35); }

.bento-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  color: var(--cyan);
  background: rgba(94, 168, 255, 0.12);
  border: 1px solid rgba(125, 165, 255, 0.3);
  margin-bottom: 18px;
}

.bento-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.bento-card p {
  margin-top: 10px;
  font-size: 14.5px;
  color: var(--muted-dark);
  max-width: 52ch;
}

.bento-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.bento-tags span {
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(190, 212, 240, 0.85);
  background: rgba(94, 168, 255, 0.1);
  border: 1px solid rgba(125, 165, 255, 0.22);
}

/* ==========================================================================
   人工智能未来（深空 + Canvas 波浪）
   ========================================================================== */
.future {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1000px 460px at 85% -10%, #0d2340 0%, transparent 60%),
    linear-gradient(180deg, #071120 0%, #0a1a2f 100%);
  color: #eaf2fd;
}

.future-canvas-wrap {
  position: absolute;
  inset: auto 0 0 0;
  height: 62%;
  pointer-events: none;
  opacity: 0.9;
  mask-image: linear-gradient(180deg, transparent 0%, #000 34%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 34%);
}

.future-canvas-wrap canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.future-inner { position: relative; }

.future .section-title { color: #fff; }
.future .section-desc { color: var(--muted-dark); }
.future .section-eyebrow { color: var(--cyan); }

.future-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 8px;
}

.future-card {
  position: relative;
  padding: 28px 26px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: transform 0.35s var(--ease-out), border-color 0.35s, background-color 0.35s;
}

.future-card:hover {
  transform: translateY(-5px);
  border-color: rgba(125, 211, 252, 0.45);
  background: rgba(255, 255, 255, 0.075);
}

.future-index {
  display: inline-block;
  font-size: 26px;
  font-weight: 800;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.3px rgba(125, 211, 252, 0.6);
  font-variant-numeric: tabular-nums;
}

.future-card h3 {
  margin-top: 18px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.future-card p {
  margin-top: 10px;
  font-size: 14.5px;
  color: var(--muted-dark);
}

/* ==========================================================================
   合作流程
   ========================================================================== */
.process { background: var(--paper); }

.steps {
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  position: relative;
}

.step {
  position: relative;
  padding: 26px 22px 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s, border-color 0.3s;
}

.step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(29, 91, 214, 0.3);
}

.step::before {
  content: "";
  position: absolute;
  top: 50%;
  right: -18px;
  width: 18px;
  height: 2px;
  background: linear-gradient(90deg, rgba(29, 91, 214, 0.5), rgba(29, 91, 214, 0.12));
}

.step:last-child::before { display: none; }

.step-no {
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.4px rgba(29, 91, 214, 0.55);
  font-variant-numeric: tabular-nums;
}

.step h3 {
  margin-top: 16px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--text);
}

.step p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

/* ==========================================================================
   关于我们
   ========================================================================== */
.about { background: linear-gradient(180deg, #fff 0%, var(--paper) 100%); }

.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 64px;
  align-items: start;
}

.about-copy p {
  margin-top: 16px;
  color: var(--muted);
  max-width: 60ch;
}

.about-copy > p:first-of-type { margin-top: 24px; }

.about-values {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.about-values li {
  padding: 18px;
  border-left: 3px solid var(--accent);
  background: var(--card);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  box-shadow: var(--shadow-sm);
}

.about-values h4 { font-size: 15.5px; color: var(--text); }

.about-values p {
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--muted);
}

.about-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-card {
  padding: 26px 28px;
  border-radius: var(--radius-md);
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.about-card h3 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.about-card p {
  margin-top: 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.6;
}

.about-card-dark {
  background: linear-gradient(140deg, #10305a, var(--ink-2));
  border-color: rgba(125, 165, 255, 0.3);
}

.about-card-dark h3 { color: var(--cyan); }

.about-card-dark p {
  color: #fff;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.about-card-dark small {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  color: rgba(190, 212, 240, 0.6);
}

/* ==========================================================================
   CTA 横幅
   ========================================================================== */
.cta-band {
  background:
    radial-gradient(760px 300px at 50% 120%, rgba(29, 91, 214, 0.5), transparent 70%),
    var(--ink);
  color: #fff;
  padding: 96px 0;
  text-align: center;
}

.cta-inner h2 {
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 700;
}

.cta-inner p {
  margin: 18px auto 0;
  max-width: 34em;
  color: rgba(210, 226, 246, 0.8);
}

.cta-inner .btn { margin-top: 34px; }

/* ==========================================================================
   联系我们
   ========================================================================== */
.contact { background: var(--paper); padding-top: 96px; }

/* ---------- 合作抽象概念视觉 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: start;
}

.contact-desc { margin-top: 16px; color: var(--muted); }

.contact-list {
  margin-top: 34px;
  display: flex;
  flex-direction: column;
}

.contact-list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.contact-label {
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.contact-list strong {
  font-size: 17px;
  font-weight: 650;
  color: var(--text);
  letter-spacing: 0.02em;
}

.contact-list a {
  transition: color 0.25s;
}

.contact-list a:hover { color: var(--accent); }

/* --- 合作视觉：双环相遇 --- */
.partner {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.partner-visual {
  position: relative;
  padding: 30px 34px 0;
  background:
    radial-gradient(480px 260px at 62% 30%, rgba(29, 91, 214, 0.07), transparent 70%),
    linear-gradient(180deg, #fbfdff 0%, #fff 100%);
}

.partner-svg { width: 100%; height: auto; }

.ring-label {
  font-size: 13px;
  letter-spacing: 0.2em;
  fill: var(--muted);
  font-family: var(--font);
}

.ring-a { transform-origin: 205px 196px; animation: ringA 7s ease-in-out infinite; }
.ring-b { transform-origin: 316px 196px; animation: ringB 7s ease-in-out infinite; }

@keyframes ringA {
  0%, 100% { transform: translateX(0); }
  50%      { transform: translateX(9px); }
}

@keyframes ringB {
  0%, 100% { transform: translateX(0); }
  50%      { transform: translateX(-9px); }
}

.lens { animation: lensBreath 7s ease-in-out infinite; transform-origin: 260px 196px; }

@keyframes lensBreath {
  0%, 100% { opacity: 0.55; }
  50%      { opacity: 1; }
}

.core {
  transform-origin: 260.5px 196px;
  animation: corePulse 3.2s ease-in-out infinite;
}

@keyframes corePulse {
  0%, 100% { transform: scale(1); opacity: 0.9; }
  50%      { transform: scale(1.28); opacity: 1; }
}

.core-dot { animation: corePulse 3.2s ease-in-out infinite; transform-origin: 260.5px 196px; }

.arc {
  animation: arcDraw 2.6s var(--ease-out) 0.4s forwards;
}

@keyframes arcDraw {
  to { stroke-dashoffset: 0; }
}

.arc-node { opacity: 0; }
.n1 { animation: nodeIn 0.5s ease 1.2s forwards; }
.n2 { animation: nodeIn 0.5s ease 1.7s forwards; }
.n3 { animation: nodeIn 0.5s ease 2.2s forwards; }

@keyframes nodeIn {
  from { opacity: 0; transform: scale(0.4); }
  to   { opacity: 1; transform: scale(1); }
}

.arc-node { transform-origin: center; transform-box: fill-box; }

.partner-copy {
  padding: 26px 34px 32px;
  border-top: 1px solid var(--line);
}

.partner-copy h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

.partner-copy p {
  margin-top: 10px;
  font-size: 14.5px;
  color: var(--muted);
  max-width: 52ch;
}

.partner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.btn-outline {
  border: 1px solid var(--line);
  color: var(--text-2);
  background: #fff;
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--ink-3);
  color: rgba(210, 226, 246, 0.78);
  padding: 72px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 56px;
}

.footer-brand p {
  margin-top: 20px;
  font-size: 14px;
  line-height: 1.85;
  max-width: 30em;
  color: rgba(190, 212, 240, 0.55);
}

.footer-col h3 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: #fff;
  margin-bottom: 18px;
}

.footer-col a,
.footer-col p {
  display: block;
  font-size: 14px;
  color: rgba(190, 212, 240, 0.6);
  padding: 5px 0;
  transition: color 0.25s;
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12.5px;
  color: rgba(190, 212, 240, 0.42);
}

/* ==========================================================================
   进场动画
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s var(--ease-out);
  transition-delay: var(--d, 0s);
}

.reveal.in { opacity: 1; transform: none; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 56px; padding-bottom: 64px; }
  .hero-visual { max-width: 560px; margin-inline: auto; }
  .scene-tabs { grid-template-columns: 1fr; }
  .scene-tablist {
    position: static;
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: none;
  }
  .scene-tablist::-webkit-scrollbar { display: none; }
  .scene-tab { flex: none; white-space: nowrap; }
  .scene-tab.is-active { transform: none; }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .step::before { display: none; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 44px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px 24px 24px;
    background: rgba(9, 21, 40, 0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.35s var(--ease-out), opacity 0.3s, visibility 0.3s;
  }

  .main-nav.is-open { transform: none; opacity: 1; visibility: visible; }

  .nav-link { padding: 13px 16px; border-radius: 12px; font-size: 16px; }
  .nav-cta { margin-left: 0; margin-top: 8px; text-align: center; }
}

@media (max-width: 720px) {
  .section { padding: 72px 0; }
  .section-head { margin-bottom: 40px; }
  .hero { padding-top: calc(var(--header-h) + 56px); }
  .hero-title { font-size: clamp(28px, 8.4vw, 38px); }
  .hero-stats { gap: 0 28px; }
  .stat dt { font-size: 27px; }
  .scene-panel { padding: 26px 22px; }
  .scene-list { grid-template-columns: 1fr; }
  .bento { grid-template-columns: 1fr; }
  .bento-lg, .bento-accent { grid-column: auto; }
  .steps { grid-template-columns: 1fr; }
  .future-grid { grid-template-columns: 1fr; }
  .about-values { grid-template-columns: 1fr; }
  .partner-visual { padding: 22px 18px 0; }
  .partner-copy { padding: 22px 22px 26px; }
  .partner-actions .btn { flex: 1 1 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { justify-content: center; text-align: center; }
  .badge-2 { left: 0; }
  .badge-3 { right: 0; }
}

/* ---------- 动效偏好：减弱 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal { opacity: 1; transform: none; }
}

/* ==========================================================================
   404 页面（极简版）
   ========================================================================== */
.error-min {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: calc(var(--header-h) + 64px) 0 148px;
  text-align: center;
  background:
    radial-gradient(900px 460px at 50% -12%, #123055 0%, transparent 62%),
    linear-gradient(180deg, #0b1e36 0%, var(--ink) 64%, #0a1a2f 100%);
  color: #fff;
}

.error-min .hero-grid {
  mask-image: radial-gradient(760px 520px at 50% 22%, #000 0%, transparent 76%);
  -webkit-mask-image: radial-gradient(760px 520px at 50% 22%, #000 0%, transparent 76%);
}

.error-min-inner {
  position: relative;
  z-index: 1;
  max-width: 620px;
  margin-inline: auto;
}

.error-min-code {
  display: block;
  font-size: clamp(84px, 15vw, 156px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(180deg, #ffffff 0%, #9cc8ff 58%, #5ea8ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 10px 44px rgba(29, 91, 214, 0.4));
}

.error-min-title {
  margin-top: 24px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
}

.error-min-desc {
  margin: 14px auto 0;
  max-width: 32em;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(210, 226, 246, 0.76);
}

.error-min-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 38px;
}

/* 底部极简波纹：品牌航线的轻声回响 */
.error-min-wave {
  position: absolute;
  inset: auto 0 0 0;
  height: 130px;
  pointer-events: none;
  opacity: 0.85;
  mask-image: linear-gradient(180deg, transparent 0%, #000 62%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 62%);
}

.error-min-wave svg { width: 100%; height: 100%; }

.error-min-wave .mw-1 { animation: minWave 14s ease-in-out infinite; }
.error-min-wave .mw-2 { animation: minWave 18s ease-in-out infinite reverse; }

@keyframes minWave {
  0%, 100% { transform: translateX(0); }
  50%      { transform: translateX(22px); }
}

@media (max-width: 720px) {
  .error-min { padding: calc(var(--header-h) + 48px) 0 124px; }
  .error-min-actions .btn { flex: 1 1 100%; }
}