/* 深数科技 设计系统 v3 —— 深色优先科技风（Modern Dark Cinema）
   深空底 + 靛紫/青蓝渐变 + 辉光 + 玻璃态；浅色为精致冷灰副主题
   语义令牌制；rgba 边框；4/8 间距节奏；cubic-bezier(.16,1,.3,1) 缓动 */

:root {
  /* 浅色（副主题）：冷灰底，保持对比度 */
  --bg: #F5F7FB;
  --bg-ambient-1: rgba(79, 70, 229, .06);
  --bg-ambient-2: rgba(14, 165, 233, .05);
  --fg: #161E2C;
  --fg2: #55617A;
  --line: rgba(22, 30, 44, .10);
  --accent: #4F46E5;
  --accent2: #0EA5E9;
  --accent-fg: #FFFFFF;
  --accent-soft: rgba(79, 70, 229, .10);
  --card: #FFFFFF;
  --card-glass: rgba(255, 255, 255, .72);
  --alt: #ECEFF6;
  --tint: rgba(79, 70, 229, .08);
  --dot: rgba(22, 30, 44, .14);
  --glow: rgba(79, 70, 229, .28);
  --band-bg: linear-gradient(120deg, #4338CA 0%, #0EA5E9 100%);
  --band-fg: #FFFFFF;
  --band-fg2: rgba(255, 255, 255, .82);
  --band-accent: #FFFFFF;
  --band-accent-fg: #3730A3;
  --ok: #15803D;
  --err: #DC2626;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 8px 24px -12px rgba(16, 24, 40, .12);
  --shadow-lift: 0 2px 4px rgba(16, 24, 40, .06), 0 20px 44px -16px rgba(79, 70, 229, .30);
  --ease: cubic-bezier(.16, 1, .3, 1);
  --radius: 14px;
  --radius-sm: 10px;
}

/* 深色（主主题）：深空底，不使用纯黑 */
[data-theme="dark"] {
  --bg: #0A0E17;
  --bg-ambient-1: rgba(99, 102, 241, .13);
  --bg-ambient-2: rgba(14, 165, 233, .09);
  --fg: #E9EEF8;
  --fg2: #97A3BC;
  --line: rgba(148, 163, 196, .14);
  --accent: #818CF8;
  --accent2: #38BDF8;
  --accent-fg: #0A0E17;
  --accent-soft: rgba(129, 140, 248, .14);
  --card: #101728;
  --card-glass: rgba(16, 23, 40, .72);
  --alt: #0C1220;
  --tint: rgba(129, 140, 248, .12);
  --dot: rgba(148, 163, 196, .20);
  --glow: rgba(99, 102, 241, .38);
  --band-bg: linear-gradient(120deg, #4F46E5 0%, #0EA5E9 100%);
  --band-fg: #FFFFFF;
  --band-fg2: rgba(255, 255, 255, .85);
  --band-accent: #FFFFFF;
  --band-accent-fg: #3730A3;
  --ok: #4ADE80;
  --err: #F87171;
  --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 10px 30px -14px rgba(0, 0, 0, .5);
  --shadow-lift: 0 2px 6px rgba(0, 0, 0, .4), 0 24px 48px -16px rgba(99, 102, 241, .42);
}

* { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  color-scheme: dark light;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
/* 环境光：靛紫/青蓝渐变光斑，缓慢漂移（深色更明显） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(720px 480px at 12% -6%, var(--bg-ambient-1), transparent 62%),
    radial-gradient(680px 520px at 96% 108%, var(--bg-ambient-2), transparent 60%);
  animation: ambient 26s ease-in-out infinite alternate;
}
@keyframes ambient {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(2%, -2%, 0) scale(1.06); }
}
html[lang="en"] body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--fg); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; }
h1, h2, h3 { line-height: 1.3; letter-spacing: -.015em; }
::selection { background: var(--accent-soft); color: var(--fg); }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 深色模式细滚动条 */
[data-theme="dark"] ::-webkit-scrollbar { width: 10px; height: 10px; }
[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 196, .25);
  border-radius: 8px;
  border: 2px solid var(--bg);
}
[data-theme="dark"] ::-webkit-scrollbar-track { background: transparent; }

.w { max-width: 1200px; margin: 0 auto; padding: 0 36px; }
.m {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 12px; letter-spacing: .06em; color: var(--fg2);
}
.sec { padding: 96px 0; border-top: 1px solid var(--line); }
.sec--flush { border-top: 0; }
.sec.alt { background: var(--alt); }
.sec.wh { background: var(--card); }
.h1 { font-size: 56px; line-height: 1.26; margin: 0 0 24px; font-weight: 700; }
.h2 { font-size: 36px; line-height: 1.3; margin: 0 0 14px; font-weight: 700; }
.h2--sm { font-size: 26px; }
.sub { color: var(--fg2); margin: 0 0 36px; max-width: 620px; }
.mu { color: var(--fg2); }
/* 渐变文字：标题强调行 */
.grad {
  background: linear-gradient(100deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
/* 眉题：短横线 + 小字 */
.eb { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--fg2); margin-bottom: 18px; }
.eb::before { content: ""; width: 22px; height: 2px; background: linear-gradient(90deg, var(--accent), var(--accent2)); flex: none; border-radius: 2px; }
.num { font-size: 12px; color: var(--accent); letter-spacing: .05em; }
.two { display: grid; grid-template-columns: 1.25fr 1fr; gap: 64px; align-items: center; }
.two--even { grid-template-columns: 1fr 1fr; }
.two--side { grid-template-columns: 1fr 340px; align-items: start; }
.two--hero { grid-template-columns: 1fr 540px; gap: 72px; align-items: center; }
.three { display: grid; grid-template-columns: repeat(3, 1fr); }
.four { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 32px; }

/* 按钮与文字链接 */
.btn {
  display: inline-flex; align-items: center; gap: 10px; padding: 14px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600; font-size: 15px; border: 1px solid var(--accent);
  cursor: pointer;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease),
    background .15s ease, color .15s ease, border-color .15s ease;
  min-height: 44px; text-align: center;
}
.btn:active { transform: scale(.97); }
.btn--p {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--accent-fg);
  border-color: transparent;
  box-shadow: 0 8px 24px -10px var(--glow);
}
.btn--p:hover { box-shadow: 0 14px 34px -10px var(--glow); transform: translateY(-1px); color: var(--accent-fg); }
.btn--s { color: var(--accent); background: transparent; }
.btn--s:hover { background: var(--accent); color: var(--accent-fg); }
.btn--block { display: flex; width: 100%; justify-content: center; }
/* 下划线文字链接 */
.lk { border-bottom: 1px solid currentColor; font-weight: 500; padding-bottom: 2px; color: var(--fg); }
.lk:hover { color: var(--accent); border-color: var(--accent); }

/* 卡片与分栏单元 */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
}
a.card:hover, .card.hoverable:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  box-shadow: var(--shadow-lift);
}
.cell { padding: 28px 32px; border-left: 1px solid var(--line); }
.cell:first-child { border-left: 0; }
/* 行式条目（问题/担忧/元信息） */
.q { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; padding: 20px 0; border-top: 1px solid var(--line); font-size: 16px; }
.q b { font-size: 17px; }
.q span { color: var(--fg2); text-align: right; }
.q--col { flex-direction: column; align-items: stretch; gap: 8px; }
.q--col span { text-align: left; }

/* 卡片网格（细线拼接，旧页面仍在用） */
.grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  background: var(--card);
  border-top: 1px solid var(--line); border-left: 1px solid var(--line);
}
.grid > div { padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.grid h3 { margin: 6px 0 8px; font-size: 18px; }
.grid p { margin: 0; color: var(--fg2); font-size: 14.5px; }
.grid--bg { background: var(--bg); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

/* 行式列表 */
.row {
  display: grid; grid-template-columns: 180px 1fr; gap: 32px;
  padding: 20px 0; border-top: 1px solid var(--line);
}
.row--last { border-bottom: 1px solid var(--line); }
.step { display: grid; grid-template-columns: 44px 1fr; padding: 12px 0; border-top: 1px solid var(--line); }
.step--last { border-bottom: 1px solid var(--line); }
.step .m { color: var(--accent); }

/* 页头：玻璃态 */
.hd {
  border-bottom: 1px solid var(--line);
  background: var(--card-glass);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  position: sticky; top: 0; z-index: 30;
}
.hd .w { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 16px; }
.logo {
  font-weight: 700; font-size: 20px; color: var(--fg) !important;
  display: flex; align-items: center; gap: 12px; line-height: 1.2;
}
.logo svg { flex: none; filter: drop-shadow(0 0 8px var(--glow)); }
.logo .tag { display: block; font-size: 11px; font-weight: 400; color: var(--fg2); letter-spacing: .02em; }
.nav { display: flex; align-items: center; }
.nav a { color: var(--fg2); font-size: 14px; margin-left: 30px; white-space: nowrap; position: relative; }
.nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -6px;
  height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: right .2s var(--ease);
}
.nav a:hover::after, .nav a.on::after { right: 0; }
.nav a:hover, .nav a.on { color: var(--accent); }
.nav .cta { color: var(--fg); font-weight: 600; }
.nav .cta::after { display: none; }
.nav .m { margin-left: 30px; }
.langlink {
  background: none; border: none; padding: 0; cursor: pointer;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px; letter-spacing: .06em; color: var(--fg2);
}
.langlink:hover { color: var(--accent); }
.hd-tools { display: flex; align-items: center; }
.icon-btn {
  background: none; border: 1px solid var(--line); border-radius: var(--radius-sm);
  color: var(--fg2); cursor: pointer; padding: 6px 8px; margin-left: 12px;
  line-height: 1; font-size: 13px;
  transition: color .15s ease, border-color .15s ease;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }
.menu-btn { display: none; }

/* 首屏 */
.hero .w { padding-top: 72px; padding-bottom: 80px; }
.hero-visual { position: relative; }
/* 首屏视觉区背后的辉光 */
.hero-visual::before {
  content: "";
  position: absolute; inset: -8% -10%;
  background: radial-gradient(closest-side, var(--glow), transparent 72%);
  opacity: .5;
  pointer-events: none;
  z-index: -1;
}
.hero-ph {
  width: 100%; height: 475px; border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-soft); border: 1px dashed color-mix(in srgb, var(--accent) 40%, var(--line));
  color: var(--fg2); font-size: 13px;
}
.hero-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px; }
.hero-card.abs { position: absolute; left: 20px; right: 20px; bottom: 20px; }

/* 深色/强调转化带 */
.band { background: var(--band-bg); color: var(--band-fg); padding: 84px 0; position: relative; overflow: hidden; }
.band::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 300px at 85% 0%, rgba(255, 255, 255, .16), transparent 60%);
  pointer-events: none;
}
.band .h2 { color: var(--band-fg); }
.band .m, .band .sub { color: var(--band-fg2); }
.band .btn { background: var(--band-accent); border-color: var(--band-accent); color: var(--band-accent-fg); }
.band .btn:hover { background: transparent; color: var(--band-fg); }

/* 页脚 */
.ft { border-top: 1px solid var(--line); padding: 24px 0; background: var(--bg); }
.ft .w { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.ft a { color: var(--fg2); }
.ft a:hover { color: var(--accent); }

/* FAQ 折叠（details 实现，无 JS 依赖） */
.acc { border-top: 1px solid var(--line); }
.acc:last-of-type { border-bottom: 1px solid var(--line); }
.acc summary {
  display: flex; justify-content: space-between; align-items: baseline; gap: 16px;
  padding: 20px 0; font-size: 16px; font-weight: 600; cursor: pointer; list-style: none;
  transition: color .15s ease;
}
.acc summary::-webkit-details-marker { display: none; }
.acc summary::after {
  content: "+"; color: var(--fg2); font-weight: 400; font-size: 20px; flex: none;
  transition: color .15s ease, transform .2s var(--ease);
}
.acc[open] summary::after { content: "×"; color: var(--accent); transform: rotate(0deg); }
.acc[open] summary { color: var(--accent); }
.acc p { margin: 0 0 20px; color: var(--fg2); font-size: 15px; max-width: 560px; }

/* 表单 */
.fld {
  display: block; width: 100%; padding: 11px 14px; margin-top: 6px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--card); color: var(--fg);
  font: inherit; font-size: 15px;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.fld:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
/* 即时校验：错误态 */
.fld--invalid { border-color: var(--err); }
.fld--invalid:focus { box-shadow: 0 0 0 3px color-mix(in srgb, var(--err) 18%, transparent); }
.fv-err { color: var(--err); font-size: 12.5px; margin: 4px 0 0; }
.fld-sm { width: 120px; }
label { font-size: 14px; font-weight: 600; display: block; margin-top: 18px; }
label .req { color: var(--err); }
.hint { font-size: 12.5px; color: var(--fg2); font-weight: 400; margin-top: 2px; }
.errlist { color: var(--err); font-size: 13.5px; margin: 4px 0 0; padding: 0; list-style: none; }
.honey { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.notice { border: 1px solid color-mix(in srgb, var(--ok) 55%, var(--line)); background: color-mix(in srgb, var(--ok) 8%, var(--card)); padding: 18px 22px; border-radius: var(--radius-sm); margin-bottom: 28px; }

/* 场景/案例 */
.breadcrumb { margin-bottom: 28px; }
.qa { padding: 20px 0; border-top: 1px solid var(--line); }
.qa b { display: block; font-size: 17px; margin-bottom: 6px; }
.qa span { color: var(--fg2); }
.qa--last { border-bottom: 1px solid var(--line); }
.meta { display: flex; justify-content: space-between; padding: 10px 0; border-top: 1px solid var(--line); font-size: 14px; }
.meta--last { border-bottom: 1px solid var(--line); }
.side { position: sticky; top: 96px; }
.side-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.tag { display: inline-block; border: 1px solid var(--line); border-radius: 999px; padding: 2px 12px; font-size: 12.5px; color: var(--fg2); margin: 0 6px 6px 0; }
.tag--on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.badge { display: inline-block; background: var(--tint); color: var(--accent); border-radius: 999px; padding: 3px 14px; font-size: 13px; font-weight: 600; }
.preview-flag {
  background: #B45309; color: #fff; text-align: center; padding: 8px;
  font-size: 13px; font-weight: 600;
}

/* 筛选 */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 32px; }
.filters a { border: 1px solid var(--line); border-radius: 999px; padding: 6px 16px; font-size: 13.5px; color: var(--fg2); transition: all .15s ease; }
.filters a:hover { border-color: var(--accent); color: var(--accent); }
.filters a.on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

/* 同意提示条：玻璃态 */
.consent {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  background: var(--card-glass);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-top: 1px solid var(--line);
  padding: 16px 0; box-shadow: 0 -8px 32px rgba(0, 0, 0, .18);
}
.consent .w { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.consent p { margin: 0; font-size: 13.5px; color: var(--fg2); max-width: 720px; }
.consent .btn { padding: 9px 18px; font-size: 13.5px; }

/* 成员 */
.member { display: grid; grid-template-columns: 240px 1fr; gap: 56px; align-items: center; }
.member + .member { margin-top: 56px; }
.member .photo { aspect-ratio: 4/5; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--alt); display: flex; align-items: center; justify-content: center; font-size: 13px; color: var(--fg2); }
.member .photo img { width: 100%; height: 100%; object-fit: cover; }

/* AI 场景自测器 */
.pick { display: block; position: relative; cursor: pointer; }
.pick input { position: absolute; opacity: 0; pointer-events: none; }
.pick-body {
  display: flex; flex-direction: column; gap: 6px; min-height: 100%;
  padding: 22px 24px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); color: var(--fg); font-size: 15px;
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease), transform .18s var(--ease);
}
.pick:hover .pick-body { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); transform: translateY(-2px); }
.pick input:checked + .pick-body {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 10px 26px -12px var(--glow);
}
.pick input:focus-visible + .pick-body { outline: 2px solid var(--accent); outline-offset: 2px; }
.pick--check .pick-body { flex-direction: row; align-items: center; gap: 12px; }
.assess-nav { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-top: 36px; }
.assess-score {
  font-size: 84px; font-weight: 700; line-height: 1; letter-spacing: -.03em;
  background: linear-gradient(100deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  font-variant-numeric: tabular-nums;
}
.badge--high { background: rgba(74, 222, 128, .16); color: #22C55E; }
[data-theme="dark"] .badge--high, :root .badge--high { color: #4ADE80; }
.badge--mid { background: rgba(245, 208, 93, .16); color: #EAB308; }
.badge--low { background: rgba(148, 163, 196, .16); color: var(--fg2); }
.score-row { display: grid; grid-template-columns: 1fr 140px 52px; gap: 16px; align-items: center; padding: 10px 0; border-top: 1px solid var(--line); }
.score-row:first-child { border-top: 0; }
.score-bar { height: 6px; border-radius: 6px; background: var(--alt); overflow: hidden; }
.score-fill { display: block; height: 100%; border-radius: 6px; background: linear-gradient(90deg, var(--accent), var(--accent2)); }

/* 摘要页打印（A4 一页） */
@media print {
  .hd, .ft, .band, .consent, .no-print, .hd-tools { display: none !important; }
  body { background: #fff; color: #000; }
  body::before { display: none; }
  .print-a4 { max-width: 190mm; margin: 0 auto; font-size: 10.5pt; line-height: 1.5; }
  .print-a4 .h2 { font-size: 15pt; }
  .sec { padding: 10px 0; border-top: 1px #ccc solid; }
  a { color: #000; }
}

/* 响应式：手机优先折叠 */
@media (max-width: 900px) {
  .two, .two--even, .two--side, .two--hero, .three, .four, .row2 { grid-template-columns: 1fr; }
  .hero .w { padding-top: 56px; padding-bottom: 56px; }
  .hero-ph { height: 260px; }
  .hero-card.abs { position: static; margin-top: -34px; margin-left: 16px; margin-right: 16px; }
  .h1 { font-size: 36px; }
  .h2 { font-size: 28px; }
  .sec { padding: 60px 0; }
  .side { position: static; }
  .member { grid-template-columns: 1fr; gap: 20px; }
  .member .photo { max-width: 240px; }
  .grid, .grid--2 { grid-template-columns: 1fr; }
  .row { grid-template-columns: 1fr; gap: 4px; }
  .cell { border-left: 0; border-top: 1px solid var(--line); }
  .cell:first-child { border-top: 0; }
  .q { flex-direction: column; align-items: flex-start; gap: 6px; }
  .q span { text-align: left; }
  .nav {
    display: none; position: absolute; top: 72px; left: 0; right: 0; z-index: 40;
    background: var(--card-glass);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: flex-start; padding: 12px 36px 20px;
  }
  .nav a { margin: 8px 0; font-size: 16px; }
  .nav.open { display: flex; }
  .menu-btn { display: inline-block; }
  .hd .w { position: relative; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}