/* ============================================================
   首志科技 SHOUZHI TECH · 全站样式
   VI: 科技蓝 #182F8E / 中国红 #E50011 / 深空底
   移动优先 · 断点 640 / 768 / 1024 / 1280
   ============================================================ */

:root {
  --blue: #182F8E;
  --blue-1: #2E4BD8;
  --blue-2: #4D6BFF;
  --blue-3: #7A93FF;
  --red: #E50011;
  --red-1: #FF2E3E;
  --bg-0: #060B1F;
  --bg-1: #0A1230;
  --bg-2: #0E1840;
  --ink: #EAF0FF;
  --ink-2: #93A3C7;
  --line: rgba(122, 147, 255, .16);
  --glass: rgba(14, 24, 64, .55);
  --font-zh: "Microsoft YaHei", "PingFang SC", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-en: "Montserrat", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --nav-h: 72px;
  --radius: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-0);
  color: var(--ink);
  font-family: var(--font-zh);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--blue-3); text-decoration: none; transition: color .25s ease; }
a:hover { color: var(--ink); }
.en { font-family: var(--font-en); }

/* ---------- 自定义滚动条 ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--blue-1), var(--blue));
  border-radius: 6px; border: 2px solid var(--bg-0);
}
::-webkit-scrollbar-thumb:hover { background: var(--blue-2); }
::selection { background: rgba(77, 107, 255, .4); color: #fff; }

/* ---------- 布局工具 ---------- */
.wrap { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { position: relative; padding: 72px 0; }
.section.alt { background: linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 50%, var(--bg-0) 100%); }
.grid { display: grid; gap: 20px; grid-template-columns: 1fr; }
.lead { color: var(--ink-2); font-size: 1.02rem; max-width: 760px; }

/* ---------- 章节标题 ---------- */
.kicker {
  display: block; /* 不用 inline-flex：避免文本成为不换行 flex 项导致移动端横向溢出 */
  font-family: var(--font-en); font-size: .78rem; letter-spacing: .22em;
  text-transform: uppercase; color: var(--blue-3); margin-bottom: 14px;
  overflow-wrap: break-word;
}
.kicker::before {
  content: ""; display: inline-block; vertical-align: 1px; margin-right: 10px;
  width: 0; height: 0;
  border-left: 7px solid transparent; border-right: 7px solid transparent;
  border-bottom: 12px solid var(--red);
  filter: drop-shadow(0 0 6px rgba(229, 0, 17, .8));
}
@media (min-width: 768px) {
  .kicker { letter-spacing: .32em; }
}
.h2 { font-size: 1.65rem; font-weight: 700; letter-spacing: .04em; margin-bottom: 14px; }
.h2 .thin { color: var(--ink-2); font-weight: 400; }
.section-head { margin-bottom: 36px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 30px; border-radius: 999px;
  font-size: .95rem; font-weight: 600; letter-spacing: .06em;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--blue) 0%, var(--blue-1) 55%, var(--blue-2) 100%);
  box-shadow: 0 6px 24px rgba(46, 75, 216, .35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(77, 107, 255, .5); color: #fff; }
.btn-ghost { color: var(--ink); border-color: rgba(122, 147, 255, .45); background: rgba(14, 24, 64, .35); backdrop-filter: blur(8px); }
.btn-ghost:hover { border-color: var(--red-1); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 26px rgba(229, 0, 17, .25); }
.btn .arrow { transition: transform .25s ease; }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- 吸顶导航 ---------- */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: linear-gradient(90deg, var(--blue-2), var(--red-1));
  z-index: 1002; transition: width .1s linear;
}
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(6, 11, 31, .55);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease;
}
.nav.scrolled { background: rgba(6, 11, 31, .85); border-bottom-color: var(--line); }
.nav-inner { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.nav-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.nav-logo img { height: 36px; width: auto; filter: drop-shadow(0 0 10px rgba(77, 107, 255, .35)); }
.nav-logo .logo-wide { display: none; }      /* 宽 Logo 宽高比 9.55，小屏会挤出汉堡键 */
.nav-logo .logo-icon { display: block; height: 36px; width: 36px; }
@media (min-width: 768px) {
  .nav-logo .logo-wide { display: block; }
  .nav-logo .logo-icon { display: none; }
}
.nav-links { display: none; list-style: none; align-items: center; gap: 4px; }
.nav-links a {
  display: block; padding: 8px 11px; font-size: .86rem; color: var(--ink-2);
  border-radius: 8px; letter-spacing: .02em; white-space: nowrap;
}
.nav-links a .en-sub { display: block; font-family: var(--font-en); font-size: .58rem; letter-spacing: .18em; color: rgba(122, 147, 255, .55); line-height: 1.1; }
.nav-links a:hover { color: var(--ink); background: rgba(46, 75, 216, .18); }
.nav-links a.active { color: #fff; background: linear-gradient(120deg, rgba(24, 47, 142, .85), rgba(46, 75, 216, .55)); }
.nav-links a.active .en-sub { color: rgba(234, 240, 255, .7); }
.nav-links a.nav-en { border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; margin-left: 8px; color: var(--blue-3); font-family: var(--font-en); letter-spacing: .12em; }
.nav-links a.nav-en:hover { border-color: var(--red-1); color: #fff; }
.nav-toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 42px; height: 42px; padding: 9px; border-radius: 10px;
  background: rgba(14, 24, 64, .6); border: 1px solid var(--line); cursor: pointer;
}
.nav-toggle span { display: block; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .3s ease, opacity .3s ease; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  position: fixed; top: var(--nav-h); left: 0; right: 0; z-index: 999;
  background: rgba(6, 11, 31, .97); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  padding: 12px 20px 22px; display: none;
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 13px 6px; border-bottom: 1px solid rgba(122, 147, 255, .1);
  color: var(--ink); font-size: 1rem;
}
.mobile-menu a .en-sub { font-family: var(--font-en); font-size: .68rem; letter-spacing: .2em; color: var(--ink-2); }
.mobile-menu a.active { color: var(--blue-3); }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center;
  padding: calc(var(--nav-h) + 40px) 0 80px;
  overflow: hidden;
  background: radial-gradient(1200px 600px at 70% 20%, rgba(24, 47, 142, .5), transparent 60%),
              radial-gradient(900px 500px at 15% 85%, rgba(14, 24, 64, .9), transparent 65%),
              var(--bg-0);
}
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
/* Hero 视觉底图：AI 生成主视觉，渐变遮罩融入深空底，缓慢推近 */
.hero-bg {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background: url("../img/hero-main.jpg") center 32% / cover no-repeat;
  opacity: .55;
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.92) 0%, rgba(0,0,0,.72) 52%, rgba(0,0,0,.3) 82%, transparent 100%);
          mask-image: linear-gradient(180deg, rgba(0,0,0,.92) 0%, rgba(0,0,0,.72) 52%, rgba(0,0,0,.3) 82%, transparent 100%);
  animation: heroDrift 32s ease-in-out infinite alternate;
}
.hero-bg-global { background-image: url("../img/global-network.jpg"); background-position: center 40%; }
@keyframes heroDrift { from { transform: scale(1.03); } to { transform: scale(1.14) translateY(-1.5%); } }
@media (prefers-reduced-motion: reduce) { .hero-bg { animation: none; } }
.hero-inner { position: relative; z-index: 2; }
.hero .kicker { font-size: .72rem; }
.br-m { display: none; }
@media (max-width: 767.98px) { .br-m { display: block; } }
.hero h1 {
  font-size: 2.5rem; line-height: 1.25; font-weight: 800; letter-spacing: .06em;
  margin: 10px 0 14px;
  background: linear-gradient(120deg, #fff 30%, var(--blue-3) 75%, var(--red-1));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.typewriter {
  font-family: var(--font-en); font-size: 1.02rem; letter-spacing: .14em;
  color: var(--blue-3); min-height: 1.8em; margin-bottom: 18px;
}
.typewriter .caret { display: inline-block; width: 2px; height: 1.1em; background: var(--red-1); vertical-align: -0.15em; margin-left: 3px; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero-sub { color: var(--ink-2); max-width: 640px; margin-bottom: 34px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }
.scroll-hint {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%); z-index: 2;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--ink-2); font-size: .7rem; letter-spacing: .3em; font-family: var(--font-en);
}
.scroll-hint::after {
  content: ""; width: 1px; height: 42px;
  background: linear-gradient(180deg, var(--blue-3), transparent);
  animation: drop 1.8s ease-in-out infinite;
}
@keyframes drop { 0% { transform: scaleY(0); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: top; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* 极光光斑 */
.aurora { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; pointer-events: none; z-index: 1; }
.aurora.a1 { width: 520px; height: 520px; top: -160px; right: -120px; background: radial-gradient(circle, rgba(46, 75, 216, .55), transparent 65%); animation: drift 16s ease-in-out infinite alternate; }
.aurora.a2 { width: 420px; height: 420px; bottom: -140px; left: -120px; background: radial-gradient(circle, rgba(229, 0, 17, .28), transparent 65%); animation: drift 20s ease-in-out infinite alternate-reverse; }
.aurora.a3 { width: 380px; height: 380px; top: 34%; left: 38%; background: radial-gradient(circle, rgba(122, 147, 255, .3), transparent 65%); animation: drift 24s ease-in-out infinite alternate; }
@keyframes drift { from { transform: translate(0, 0) scale(1); } to { transform: translate(60px, 40px) scale(1.15); } }

/* ---------- 页头（内页） ---------- */
.page-hero {
  position: relative; padding: calc(var(--nav-h) + 70px) 0 60px; overflow: hidden;
  background: radial-gradient(1000px 480px at 80% 0%, rgba(24, 47, 142, .55), transparent 62%), var(--bg-0);
}
.page-hero h1 { font-size: 2.1rem; font-weight: 800; letter-spacing: .05em; margin: 8px 0 12px; }
.page-hero .lead { max-width: 720px; }
.crumb { font-size: .8rem; color: var(--ink-2); margin-bottom: 16px; font-family: var(--font-en); letter-spacing: .08em; }
.crumb a { color: var(--blue-3); }
.crumb span { margin: 0 8px; opacity: .5; }

/* ---------- 数据带 ---------- */
.stats { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(10, 18, 48, .5); }
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); }
.stat {
  background: var(--bg-0); padding: 30px 18px; text-align: center;
  transition: background .3s ease;
}
.stat:hover { background: rgba(14, 24, 64, .7); }
.stat .num { font-family: var(--font-en); font-size: 2rem; font-weight: 700; color: #fff; }
.stat .num .unit { font-size: 1.1rem; color: var(--red-1); margin-left: 2px; }
.stat .label { font-size: .85rem; color: var(--ink-2); margin-top: 4px; }

/* ---------- 关键词缎带 ---------- */
.ribbon { overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 16px 0; background: rgba(10, 18, 48, .35); }
.ribbon-track { display: flex; width: max-content; animation: marquee 30s linear infinite; }
.ribbon:hover .ribbon-track { animation-play-state: paused; }
.ribbon-item { display: inline-flex; align-items: center; gap: 14px; padding: 0 22px; font-family: var(--font-en); letter-spacing: .22em; font-size: .82rem; color: var(--ink-2); white-space: nowrap; }
.ribbon-item::after { content: ""; width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent; border-bottom: 9px solid var(--red); opacity: .8; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- 卡片 ---------- */
.card {
  position: relative; border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(14, 24, 64, .85), rgba(10, 18, 48, .6));
  border: 1px solid var(--line);
  padding: 30px 26px; overflow: hidden;
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
  transform-style: preserve-3d;
}
.card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(420px 200px at var(--mx, 50%) var(--my, 0%), rgba(77, 107, 255, .18), transparent 70%);
  opacity: 0; transition: opacity .3s ease; pointer-events: none;
}
.card:hover { border-color: rgba(77, 107, 255, .45); box-shadow: 0 14px 40px rgba(6, 11, 31, .8), 0 0 0 1px rgba(77, 107, 255, .15); }
.card:hover::before { opacity: 1; }
.card .idx { font-family: var(--font-en); font-size: .72rem; letter-spacing: .3em; color: var(--red-1); margin-bottom: 12px; }
.card h3 { font-size: 1.15rem; margin-bottom: 4px; letter-spacing: .03em; }
.card .en-cap { font-family: var(--font-en); font-size: .66rem; letter-spacing: .26em; text-transform: uppercase; color: var(--blue-3); display: block; margin-bottom: 12px; }
.card p { color: var(--ink-2); font-size: .92rem; }
.card ul { list-style: none; margin-top: 12px; }
.card ul li { position: relative; padding: 5px 0 5px 20px; color: var(--ink-2); font-size: .9rem; }
.card ul li::before {
  content: ""; position: absolute; left: 2px; top: 13px;
  width: 0; height: 0; border-left: 4px solid transparent; border-right: 4px solid transparent; border-bottom: 7px solid var(--red);
}
.card .more { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; font-size: .85rem; color: var(--blue-3); }
.card a.stretched::after { content: ""; position: absolute; inset: 0; }

/* ---------- 图片容器（带深色渐变兜底） ---------- */
.imgbox {
  position: relative; overflow: hidden; border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(140deg, #0E1840 0%, #182F8E 55%, #060B1F 100%);
  aspect-ratio: 16 / 9;
}
.imgbox.r32 { aspect-ratio: 3 / 2; }
.imgbox img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.imgbox .imgcap {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 26px 18px 12px; font-size: .78rem; color: rgba(234, 240, 255, .85);
  background: linear-gradient(180deg, transparent, rgba(6, 11, 31, .85));
  font-family: var(--font-en); letter-spacing: .14em;
}

/* ---------- 滚动渐入 ---------- */
/* 仅 JS 可用且元素位于首屏以下时才施加隐藏态（.pre 由 JS 添加）：
   无 JS 环境（爬虫/AI 智能体）与首屏内容始终立即可见 */
html.js .reveal { transition: opacity .7s ease, transform .7s ease; transition-delay: var(--d, 0s); }
html.js .reveal.pre { opacity: 0; transform: translateY(28px); }
html.js .reveal.in { opacity: 1; transform: none; }

/* ---------- 集团矩阵 ---------- */
.group-diagram { position: relative; padding: 20px 0 6px; }
.group-svg { width: 100%; height: auto; display: block; }
.group-cards { display: grid; gap: 20px; grid-template-columns: 1fr; margin-top: 26px; }

/* ---------- 文章 ---------- */
.article-list { display: grid; gap: 44px; }
.article {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(170deg, rgba(14, 24, 64, .6), rgba(10, 18, 48, .35));
  padding: 30px 22px;
}
.article header { margin-bottom: 18px; }
.article h2 { font-size: 1.35rem; letter-spacing: .03em; margin-bottom: 8px; }
.article .byline { font-size: .8rem; color: var(--ink-2); font-family: var(--font-en); letter-spacing: .12em; }
.article .byline b { color: var(--red-1); font-weight: 600; }
.article p { color: #C9D5F2; font-size: .95rem; margin-bottom: 14px; text-align: justify; }
.article .imgbox { margin: 18px 0; }

/* ---------- 时间轴 ---------- */
.timeline { position: relative; margin-top: 10px; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(180deg, var(--blue-2), var(--red)); opacity: .6; }
.timeline-item { position: relative; padding: 0 0 30px 12px; }
.timeline-item::before {
  content: ""; position: absolute; left: -26px; top: 8px;
  width: 0; height: 0; border-left: 6px solid transparent; border-right: 6px solid transparent; border-bottom: 10px solid var(--red-1);
  filter: drop-shadow(0 0 6px rgba(229, 0, 17, .7));
}
.timeline-item .year { font-family: var(--font-en); font-size: 1.2rem; font-weight: 700; color: var(--blue-3); }
.timeline-item h3 { font-size: 1.02rem; margin: 4px 0; }
.timeline-item p { color: var(--ink-2); font-size: .9rem; }

/* ---------- 表单 ---------- */
.form { display: grid; gap: 16px; }
.form label { display: block; font-size: .85rem; color: var(--ink-2); margin-bottom: 6px; letter-spacing: .05em; }
.form label i { color: var(--red-1); font-style: normal; }
.form input, .form textarea {
  width: 100%; padding: 13px 16px; border-radius: 10px;
  background: rgba(6, 11, 31, .7); border: 1px solid var(--line);
  color: var(--ink); font-size: .95rem; font-family: inherit;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.form input:focus, .form textarea:focus { outline: none; border-color: var(--blue-2); box-shadow: 0 0 0 3px rgba(77, 107, 255, .18); }
.form textarea { min-height: 140px; resize: vertical; }
.form .err { color: var(--red-1); font-size: .8rem; min-height: 1.2em; }
.form-ok {
  display: none; padding: 16px 20px; border-radius: 10px;
  background: rgba(24, 47, 142, .35); border: 1px solid rgba(77, 107, 255, .5);
  color: var(--ink); font-size: .92rem;
}
.form-ok.show { display: block; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table.data { width: 100%; border-collapse: collapse; font-size: .88rem; min-width: 640px; }
table.data th, table.data td { padding: 12px 14px; text-align: left; border-bottom: 1px solid rgba(122, 147, 255, .12); vertical-align: top; }
table.data th { background: rgba(14, 24, 64, .8); color: var(--blue-3); font-family: var(--font-en); letter-spacing: .1em; font-size: .72rem; text-transform: uppercase; }
table.data tr:hover td { background: rgba(46, 75, 216, .08); }
.empty-tip { padding: 40px 20px; text-align: center; color: var(--ink-2); }

/* ---------- CTA 带 ---------- */
.cta-band {
  position: relative; text-align: center; padding: 84px 20px; overflow: hidden;
  background: radial-gradient(800px 380px at 50% 120%, rgba(24, 47, 142, .65), transparent 70%), var(--bg-1);
  border-top: 1px solid var(--line);
}
.cta-band h2 { font-size: 1.7rem; letter-spacing: .06em; margin-bottom: 10px; }
.cta-band .en-cap { font-family: var(--font-en); letter-spacing: .3em; font-size: .74rem; color: var(--blue-3); text-transform: uppercase; display: block; margin-bottom: 16px; }
.cta-band p { color: var(--ink-2); margin-bottom: 30px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); background: #050918; padding: 60px 0 30px; }
.footer-grid { display: grid; gap: 34px; grid-template-columns: 1fr; }
.footer-brand img.footer-logo { height: 44px; width: auto; margin-bottom: 16px; }
.footer-brand p { color: var(--ink-2); font-size: .85rem; max-width: 300px; }
.footer h4 { font-size: .82rem; letter-spacing: .18em; color: var(--ink); margin-bottom: 14px; font-family: var(--font-en); text-transform: uppercase; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 9px; }
.footer ul a { color: var(--ink-2); font-size: .87rem; }
.footer ul a:hover { color: var(--blue-3); }
.footer-contact p { color: var(--ink-2); font-size: .87rem; margin-bottom: 9px; }
.footer-contact .tel { font-family: var(--font-en); font-size: 1.25rem; color: #fff; letter-spacing: .06em; }
.footer-bottom {
  margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(122, 147, 255, .1);
  display: flex; flex-direction: column; gap: 8px;
  color: rgba(147, 163, 199, .65); font-size: .76rem;
}
.footer-bottom a { color: rgba(147, 163, 199, .8); font-size: .76rem; }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 26px; z-index: 900;
  width: 46px; height: 46px; border-radius: 12px;
  background: linear-gradient(140deg, var(--blue), var(--blue-1));
  border: 1px solid rgba(122, 147, 255, .4); color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: translateY(14px); pointer-events: none;
  transition: opacity .3s ease, transform .3s ease;
  box-shadow: 0 8px 24px rgba(24, 47, 142, .5);
}
.to-top.show { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { background: linear-gradient(140deg, var(--blue-1), var(--blue-2)); }

/* ---------- 杂项 ---------- */
.tag { display: inline-block; padding: 3px 12px; border-radius: 999px; border: 1px solid var(--line); font-size: .74rem; color: var(--blue-3); margin: 0 6px 8px 0; letter-spacing: .08em; }
.note { font-size: .8rem; color: var(--ink-2); }
.divider-tri { display: flex; justify-content: center; gap: 10px; margin: 8px 0 30px; }
.divider-tri i { width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent; border-bottom: 9px solid var(--blue-2); opacity: .7; }
.divider-tri i:nth-child(2) { border-bottom-color: var(--red); }
.text-red { color: var(--red-1); }
.bilingual p { margin-bottom: 14px; }
.bilingual .p-en { font-family: var(--font-en); color: var(--ink-2); font-size: .92rem; }
.compare { display: grid; gap: 20px; grid-template-columns: 1fr; }
.mvs { display: grid; gap: 20px; grid-template-columns: 1fr; }

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .grid.c2 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .hero h1 { font-size: 3rem; }
  .h2 { font-size: 1.85rem; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 768px) {
  .section { padding: 96px 0; }
  .grid.c3 { grid-template-columns: repeat(3, 1fr); }
  .grid.c2 { grid-template-columns: repeat(2, 1fr); }
  .compare { grid-template-columns: repeat(3, 1fr); }
  .mvs { grid-template-columns: repeat(3, 1fr); }
  .article { padding: 40px 38px; }
  .group-cards { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr 1.2fr; }
  .footer-bottom { flex-direction: row; justify-content: space-between; flex-wrap: wrap; }
  .form.cols2 { grid-template-columns: 1fr 1fr; }
  .form.cols2 .full { grid-column: 1 / -1; }
}
@media (min-width: 1024px) {
  .nav-links { display: flex; }
  .nav-toggle { display: none; }
  .mobile-menu { display: none !important; }
  .hero h1 { font-size: 3.6rem; }
  .grid.c3 { grid-template-columns: repeat(3, 1fr); }
  .grid.c5 { grid-template-columns: repeat(5, 1fr); }
  .stats-grid { grid-template-columns: repeat(5, 1fr); }
  .page-hero h1 { font-size: 2.6rem; }
  .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 46px; align-items: center; }
}
@media (min-width: 1280px) {
  .wrap { max-width: 1240px; }
  .hero h1 { font-size: 4rem; }
  .h2 { font-size: 2rem; }
}

/* ---------- Hero AI 徽标 ---------- */
.hero-emblem { display: none; }
@media (min-width: 1024px) {
  .hero-inner { display: flex; align-items: center; gap: 48px; }
  .hero-inner .hero-text { flex: 1 1 auto; min-width: 0; }
  .hero-emblem { display: block; flex: 0 0 auto; }
}
.hero-emblem img {
  width: clamp(260px, 20vw, 300px); height: auto;
  mix-blend-mode: screen;   /* 纯黑底抽象光雕融入深色 Hero，无方框感 */
  animation: emblemFloat 6.5s ease-in-out infinite, emblemGlow 5.2s ease-in-out infinite;
}
@keyframes emblemFloat { 0%, 100% { transform: translateY(-9px); } 50% { transform: translateY(11px); } }
@keyframes emblemGlow {
  0%, 100% { filter: drop-shadow(0 0 18px rgba(77, 107, 255, .5)) drop-shadow(0 0 44px rgba(229, 0, 17, .18)); }
  50% { filter: drop-shadow(0 0 32px rgba(77, 107, 255, .82)) drop-shadow(0 0 68px rgba(229, 0, 17, .36)); }
}

/* ---------- 卡顶配图（卡片玻璃风格内嵌图） ---------- */
.card .imgbox.card-top { margin: -30px -26px 20px; border: none; border-bottom: 1px solid var(--line); border-radius: 0; }
.card.dir-head { padding: 30px 26px; }
@media (min-width: 768px) {
  .card.dir-head { padding: 36px 36px; }
  .card.dir-head .imgbox.card-top { margin: -36px -36px 26px; }
}
.dir-head .lead { max-width: 860px; }
.dir-cap-label { margin: 20px 0 4px; }
.dir-points { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 26px; margin-top: 8px; }
.dir-points li { position: relative; padding-left: 18px; color: var(--ink-2); font-size: .9rem; }
.dir-points li::before {
  content: ""; position: absolute; left: 0; top: 8px;
  width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent; border-bottom: 8px solid var(--red);
  filter: drop-shadow(0 0 5px rgba(229, 0, 17, .6));
}

/* ---------- 宽幅 banner 图 ---------- */
.imgbox.banner-glow {
  border-color: rgba(122, 147, 255, .4);
  box-shadow: 0 0 0 1px rgba(77, 107, 255, .3), 0 22px 70px rgba(24, 47, 142, .5);
}

/* ---------- 横向技术演进时间轴 ---------- */
.roadmap-track { position: relative; display: grid; gap: 24px; grid-template-columns: 1fr; padding-left: 26px; margin-top: 8px; }
.roadmap-track::before {
  content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px;
  background: linear-gradient(180deg, var(--blue-2), var(--red)); opacity: .6;
}
.roadmap-node { position: relative; }
.roadmap-node::before {
  content: ""; position: absolute; left: -25px; top: 7px;
  width: 0; height: 0; border-left: 6px solid transparent; border-right: 6px solid transparent; border-bottom: 10px solid var(--red-1);
  filter: drop-shadow(0 0 6px rgba(229, 0, 17, .7));
}
.roadmap-node .year { font-family: var(--font-en); font-size: 1.1rem; font-weight: 700; color: var(--blue-3); letter-spacing: .06em; }
.roadmap-node h3 { font-size: 1rem; margin: 3px 0; letter-spacing: .03em; }
.roadmap-node p { color: var(--ink-2); font-size: .86rem; }
@media (min-width: 1024px) {
  .roadmap-track { grid-template-columns: repeat(6, 1fr); gap: 16px; padding-left: 0; padding-top: 46px; }
  .roadmap-track::before { left: 0; right: 0; top: 16px; bottom: auto; width: auto; height: 2px; background: linear-gradient(90deg, var(--blue-2), var(--red)); }
  .roadmap-node::before { left: 3px; top: -39px; }
}

/* ---------- 集团四卡（含开放生态席） ---------- */
.eco-card { border-style: dashed; border-color: rgba(255, 46, 62, .42); }
.eco-card:hover { border-color: rgba(255, 46, 62, .7); }
.diagram-note { text-align: center; color: var(--ink-2); font-size: .88rem; margin-top: 4px; }
@media (min-width: 768px) {
  .group-cards.four { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1280px) {
  .group-cards.four { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .hero-emblem img { animation: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
  .ribbon-track { animation: none; }
  .scroll-hint::after { animation: none; }
}