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

:root {
  --ink: #1c2434;
  --ink-soft: #55607a;
  --ink-faint: #9aa3b5;
  --paper: #ffffff;
  --bg: #f5f7fb;
  --blue: #0656f4;
  --blue-soft: #edf3fe;
  --radius: 22px;
  --radius-lg: 30px;
  --shadow: 0 2px 6px rgba(28, 36, 52, .03), 0 16px 40px -18px rgba(28, 36, 52, .12);
  --shadow-hover: 0 4px 10px rgba(28, 36, 52, .04), 0 26px 54px -20px rgba(6, 86, 244, .2);
  --mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
}

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

img { display: block; width: 100%; height: 100%; object-fit: cover; }
a { color: inherit; text-decoration: none; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 32px; }

h1 { font-size: clamp(34px, 4.2vw, 52px); line-height: 1.28; font-weight: 700; letter-spacing: -0.5px; }
h1 .thin { font-weight: 300; color: var(--ink-soft); }
h2 { font-size: clamp(27px, 3vw, 36px); line-height: 1.35; font-weight: 700; letter-spacing: -0.3px; }
h3 { font-size: 18px; font-weight: 650; line-height: 1.55; }

.mono { font-family: var(--mono); }
.kicker {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 2.5px;
  font-weight: 600; color: var(--blue);
  background: var(--blue-soft); border-radius: 999px;
  padding: 7px 16px; margin-bottom: 24px;
}
.kicker-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--blue); }
.label {
  font-family: var(--mono); font-size: 11px; letter-spacing: 2px;
  font-weight: 600; color: var(--ink-faint); display: block; margin-bottom: 14px;
}
.label.accent { color: var(--blue); letter-spacing: .5px; margin: 10px 0 12px; }
.body-text { color: var(--ink-soft); font-size: 14.5px; }

/* ============ 按钮（胶囊） ============ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 30px; font-size: 14.5px; font-weight: 600;
  border-radius: 999px;
  transition: background .2s, color .2s, transform .2s, box-shadow .2s;
}
.btn:active { transform: scale(.97); }
.btn-dark { background: var(--blue); color: #fff; box-shadow: 0 10px 24px -10px rgba(6, 86, 244, .45); }
.btn-dark:hover { background: #0b63ff; box-shadow: 0 14px 30px -10px rgba(6, 86, 244, .5); transform: translateY(-1px); }
.btn-arrow { font-family: var(--mono); transition: transform .2s; }
.btn-dark:hover .btn-arrow { transform: translateX(3px); }
.btn-outline { background: var(--paper); color: var(--ink-soft); font-weight: 500; box-shadow: var(--shadow); }
.btn-outline:hover { color: var(--blue); transform: translateY(-1px); }

/* ============ 卡片（无框柔影） ============ */
.card {
  background: var(--paper);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow);
  transition: transform .35s ease, box-shadow .35s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }

/* ============ 导航 ============ */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(245, 247, 251, .8);
  backdrop-filter: blur(14px);
  transition: box-shadow .25s;
}
.nav.scrolled { box-shadow: 0 6px 24px -14px rgba(28, 36, 52, .18); }
.nav-inner { max-width: 1160px; margin: 0 auto; padding: 0 32px; height: 66px; display: flex; align-items: center; gap: 40px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 9px;
  background: linear-gradient(135deg, #0a63ff, #00b3ff);
  box-shadow: 0 5px 12px -4px rgba(6, 86, 244, .5);
}
.brand-en { font-weight: 700; font-size: 16px; }
.brand-cn { font-size: 12.5px; color: var(--ink-faint); }
.nav-links { display: flex; gap: 36px; margin-left: auto; font-size: 14px; }
.nav-links a { color: var(--ink-soft); transition: color .15s; }
.nav-links a:hover { color: var(--blue); }
.nav-cta { padding: 9px 22px; font-size: 13.5px; box-shadow: none; }
.nav-cta:hover { box-shadow: 0 8px 18px -8px rgba(6, 86, 244, .5); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; border-radius: 2px; background: var(--ink); margin: 5px 0; }

/* ============ 首屏 ============ */
.hero { position: relative; padding: 90px 0 110px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; top: -260px; right: -180px;
  width: 720px; height: 720px; border-radius: 50%;
  background: radial-gradient(circle, rgba(6, 86, 244, .09), transparent 65%);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; bottom: -320px; left: -220px;
  width: 620px; height: 620px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 179, 255, .07), transparent 65%);
  pointer-events: none;
}
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 72px; align-items: center; }
.hero h1 { margin-bottom: 24px; }
.hero-sub { font-size: 16.5px; color: var(--ink-soft); max-width: 520px; margin-bottom: 26px; }
.hero-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.chip {
  font-size: 13px; font-weight: 600; color: var(--blue);
  background: var(--paper);
  border-radius: 999px; padding: 8px 18px;
  box-shadow: var(--shadow);
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-media { position: relative; }
.hero-media img {
  height: auto; max-height: 600px;
  object-fit: contain;
  -webkit-mask-image: radial-gradient(ellipse 90% 92% at 50% 50%, #000 68%, transparent 99%);
  mask-image: radial-gradient(ellipse 90% 92% at 50% 50%, #000 68%, transparent 99%);
}

/* ============ 通用区块 ============ */
.section { padding: 96px 0; }
.section-head { margin-bottom: 54px; max-width: 640px; }
.lead { font-size: 16px; color: var(--ink-soft); margin-bottom: 44px; max-width: 620px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.grid-3 h3 { font-size: 19px; margin-bottom: 8px; }

/* 技术：四道鸿沟 */
.gaps { margin-bottom: 24px; }
.gap { display: flex; gap: 26px; align-items: flex-start; }
.gap-num {
  flex-shrink: 0;
  font-size: 30px; font-weight: 700; line-height: 1.3;
  color: #c9d9f8; user-select: none;
}
.gap-body { flex: 1; min-width: 0; }
.gap h3 { font-size: 17px; margin-bottom: 6px; }
.gap .label { margin-bottom: 10px; letter-spacing: 1.2px; white-space: nowrap; }

/* 三大架构 */
.arch-num {
  display: inline-block; font-size: 11.5px; font-weight: 600;
  color: var(--blue); letter-spacing: 2px;
  background: var(--blue-soft); border-radius: 999px;
  padding: 5px 13px; margin-bottom: 20px;
}
.archs h3 { font-size: 19px; }

/* 产品 */
.stage-lead {
  font-size: clamp(25px, 3.4vw, 38px); font-weight: 700; letter-spacing: -0.5px;
  line-height: 1.4; margin-bottom: 46px;
}
.stage-lead em { font-style: normal; color: var(--blue); }
.stages { margin-bottom: 24px; }
.stage-card { position: relative; overflow: hidden; padding: 42px 38px; }
.stage-card::after {
  content: ""; position: absolute; right: -56px; top: -56px;
  width: 170px; height: 170px; border-radius: 50%;
  background: radial-gradient(circle, rgba(6, 86, 244, .08), transparent 70%);
}
.year {
  display: inline-block; font-size: 13px; color: var(--blue); font-weight: 600;
  letter-spacing: 2px; background: var(--blue-soft);
  padding: 6px 15px; border-radius: 999px;
}
.stages h3 { font-size: 27px; font-weight: 700; margin: 18px 0 10px; letter-spacing: -0.3px; }

.die-list { display: flex; flex-direction: column; gap: 18px; }
.die-item {
  display: grid; grid-template-columns: 240px 1fr; gap: 32px; align-items: center;
  padding: 30px 34px;
}
.die-name h3 { font-size: 18px; }
.die-badge {
  display: inline-block; margin-top: 10px; font-size: 10.5px;
  color: var(--blue); background: var(--blue-soft);
  letter-spacing: 1.5px; padding: 4px 12px; border-radius: 999px;
}
.die-item > p { font-size: 14.5px; color: var(--ink-soft); }
.die-item > p em { font-style: normal; color: var(--ink); font-weight: 600; }

/* 愿景 */
.vision-card {
  background: linear-gradient(135deg, #0a2a6e 0%, #0656f4 60%, #0a86ff 100%);
  border-radius: var(--radius-lg);
  padding: 100px 48px;
  text-align: center;
  box-shadow: 0 36px 80px -28px rgba(6, 86, 244, .45);
}
.vision-kicker {
  font-size: 11px; letter-spacing: 3px; font-weight: 600;
  color: rgba(255, 255, 255, .6); margin-bottom: 22px;
}
.vision-big { font-size: clamp(29px, 4.4vw, 50px); font-weight: 700; letter-spacing: -0.5px; line-height: 1.4; color: #fff; }
.vision-big span { color: #a5cdff; }

/* 全景图 */
.diagram { margin-top: 64px; }
.diagram-card {
  background: var(--paper);
  border-radius: var(--radius-lg); box-shadow: var(--shadow);
  padding: 48px 32px; display: flex; justify-content: center;
}
.diagram svg { width: min(600px, 100%); height: auto; font-family: var(--sans); }
.diagram .pill rect { fill: #fff; stroke: #d7e3fb; }
.diagram .pill text { fill: var(--blue); font-size: 15px; font-weight: 600; text-anchor: middle; }
.arc { fill: none; stroke: #eef1f7; stroke-width: 34; }
.arc-label { font-size: 19px; font-weight: 700; fill: #2a3550; text-anchor: middle; }
.ring3-label { font-size: 15px; font-weight: 600; fill: #1d4fd7; text-anchor: middle; }
.ring3-en { font-family: var(--mono); font-size: 12.5px; letter-spacing: 2px; fill: #1d4fd7; text-anchor: middle; }
.c-small { font-size: 13.5px; fill: #b9cdfa; text-anchor: middle; }
.c-title { font-size: 30px; font-weight: 700; fill: #fff; text-anchor: middle; letter-spacing: 1px; }
.c-tiny { font-size: 12px; fill: #93b1f2; text-anchor: middle; }

/* 页脚 */
.footer { padding: 48px 0 56px; }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.footer-mail { display: block; font-size: 15px; font-weight: 600; color: var(--ink); margin-top: 12px; }
.footer-mail:hover { color: var(--blue); }
.footer-meta { font-size: 12.5px; color: var(--ink-faint); text-align: right; }
.footer-icp { margin-top: 36px; text-align: center; }
.footer-icp a { font-size: 12px; color: var(--ink-faint); transition: color .15s; }
.footer-icp a:hover { color: var(--blue); }

/* ============ 动效 ============ */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s ease, transform .8s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-media { max-width: 480px; }
}

@media (max-width: 860px) {
  .hero { padding: 64px 0 76px; }
  .section { padding: 72px 0; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .card { padding: 30px 26px; }
  .gap-num { font-size: 36px; }
  .die-item { grid-template-columns: 1fr; gap: 12px; }
  .vision-card { padding: 68px 28px; }
  .diagram-card { padding: 28px 12px; }
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 4px;
    position: absolute; top: 66px; left: 0; right: 0;
    background: #fff;
    border-radius: 0 0 22px 22px; box-shadow: var(--shadow);
    padding: 12px 32px 20px;
  }
  .nav-links.open a { padding: 13px 0; }
  .footer-meta { text-align: left; }
}