/* 德信智能官网（idexin.cn）共享样式
   配色沿用知也 App 设计令牌（zhiye/common/theme/tokens.js）：
   primary #35597E（藏青蓝）· accent #E34D2E（赭红/朱红）· gold #C99A2E（成就金）
   视觉语言：新中式文人 × 现代工具 —— 克制的留白、印章意象、宋体标题点缀、现代化的卡片与交互
   ------------------------------------------------------------------ */

:root {
  /* 品牌色——基准值与 App 端令牌保持一致，不改变 */
  --color-primary: #35597E;
  --color-primary-light: #5C82A6;
  --color-primary-dark: #24405D;
  --color-accent: #E34D2E;
  --color-gold: #C99A2E;

  /* 由基准值派生的扩展色阶（仅用于本站视觉分层，不改变品牌基准色) */
  --color-primary-50: #F2F6FA;
  --color-primary-100: #E4ECF3;
  --color-primary-600: #2C4A69;
  --color-primary-700: #1F3650;
  --color-accent-dark: #C13D22;
  --color-accent-100: #FBEAE5;
  --color-gold-dark: #A87D1F;
  --color-gold-100: #F8F0DC;

  --color-text: #1A1A1A;
  --color-text-secondary: #5C6670;
  --color-text-placeholder: #9AA4AE;
  --color-bg: #F5F7FA;
  --color-bg-card: #FFFFFF;
  --color-bg-elevated: #FFFFFF;
  --color-bg-sunken: #EEF2F6;
  --color-border: #E5E8EB;
  --color-border-strong: #D6DBE1;

  --shadow-xs: 0 1px 2px rgba(20,30,45,0.05);
  --shadow-card: 0 4px 16px rgba(20,30,45,0.07);
  --shadow-md: 0 10px 28px rgba(20,30,45,0.10);
  --shadow-float: 0 8px 32px rgba(36,64,93,0.16);
  --shadow-lg: 0 24px 56px rgba(20,30,45,0.16);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;

  --max-width: 1080px;
  --content-width: 780px;

  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif;

  --ease: cubic-bezier(.4,0,.2,1);
  --transition-fast: 160ms var(--ease);
  --transition: 240ms var(--ease);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary-light: #7CA1C4;
    --color-primary-50: rgba(92,130,166,0.10);
    --color-primary-100: rgba(92,130,166,0.18);
    --color-accent-100: rgba(227,77,46,0.14);
    --color-gold-100: rgba(201,154,46,0.14);

    --color-text: #ECEEF0;
    --color-text-secondary: #9FA9B3;
    --color-text-placeholder: #6B7480;
    --color-bg: #111317;
    --color-bg-card: #1B1E23;
    --color-bg-elevated: #22262C;
    --color-bg-sunken: #17191D;
    --color-border: #2A2E34;
    --color-border-strong: #383D45;

    --shadow-xs: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-card: 0 4px 16px rgba(0,0,0,0.32);
    --shadow-md: 0 10px 28px rgba(0,0,0,0.38);
    --shadow-float: 0 8px 32px rgba(0,0,0,0.45);
    --shadow-lg: 0 24px 56px rgba(0,0,0,0.5);

    color-scheme: dark;
  }
}

:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent); text-decoration: none; }
.legal-doc a,
.contact-list a { text-decoration: underline; text-decoration-color: currentColor; text-underline-offset: 2px; }
img { max-width: 100%; display: block; }

::selection { background: var(--color-accent); color: #fff; }

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

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ 顶部导航 ============ */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-card); /* 回退：不支持 color-mix()/backdrop-filter 的浏览器仍为实色 */
  background: color-mix(in srgb, var(--color-bg-card) 82%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  backdrop-filter: blur(14px) saturate(160%);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--color-text);
}
.brand img { width: 30px; height: 30px; filter: drop-shadow(0 2px 6px rgba(227,77,46,0.28)); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14.5px;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--color-text-secondary);
  position: relative;
  padding: 7px 14px;
  border-radius: var(--radius-full);
  font-weight: 500;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-links a:hover { color: var(--color-primary); background: var(--color-primary-50); text-decoration: none; }
.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-100);
  font-weight: 600;
}

@media (prefers-color-scheme: dark) {
  .nav-links a:hover, .nav-links a.active { color: var(--color-primary-light); }
}

/* ============ Hero ============ */
.hero {
  position: relative;
  padding: 88px 0 64px;
  text-align: center;
  overflow: hidden;
  background:
    radial-gradient(560px 320px at 12% -10%, var(--color-gold-100), transparent 60%),
    radial-gradient(680px 420px at 92% 0%, var(--color-primary-100), transparent 55%);
}
.hero::before {
  content: "知";
  position: absolute;
  top: -6%;
  right: -2%;
  font-family: var(--font-serif);
  font-size: 340px;
  line-height: 1;
  font-weight: 700;
  color: var(--color-primary);
  opacity: 0.045;
  pointer-events: none;
  user-select: none;
  z-index: 0;
}
.hero::after {
  content: "";
  position: absolute;
  top: 40px;
  left: 6%;
  width: 46px;
  height: 46px;
  border: 1.5px solid var(--color-accent);
  border-radius: 8px;
  opacity: 0.16;
  transform: rotate(12deg);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0 0 18px;
  color: var(--color-primary-700);
}
@media (prefers-color-scheme: dark) {
  .hero h1 { color: var(--color-text); }
}
.hero p.lead {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto 34px;
}
.hero .accent-word,
.quote-accent {
  color: var(--color-accent);
  font-family: var(--font-serif);
  font-weight: 700;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-600) 100%);
  color: #fff;
  border: 1px solid transparent;
  box-shadow: 0 6px 20px rgba(36,64,93,0.28);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  cursor: pointer;
}
.btn:hover {
  background: linear-gradient(180deg, var(--color-primary-600) 0%, var(--color-primary-dark) 100%);
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(36,64,93,0.34);
  text-decoration: none;
  color: #fff;
}
.btn.secondary {
  background: var(--color-bg-card);
  color: var(--color-primary);
  border: 1px solid var(--color-border-strong);
  box-shadow: var(--shadow-xs);
}
.btn.secondary:hover {
  background: var(--color-primary-50);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}
@media (prefers-color-scheme: dark) {
  .btn.secondary { color: var(--color-primary-light); border-color: var(--color-border-strong); }
  .btn.secondary:hover { color: var(--color-primary-light); border-color: var(--color-primary-light); }
}
.btn-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ============ 卡片网格 ============ */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin: 32px 0;
}
.card {
  position: relative;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px 28px 28px;
  box-shadow: var(--shadow-card);
  text-decoration: none;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
  opacity: 0;
  transition: opacity var(--transition);
}
a.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}
a.card:hover::before { opacity: 1; }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-50);
  color: var(--color-primary);
  margin-bottom: 16px;
}
.card-icon svg { width: 22px; height: 22px; stroke: currentColor; fill: none; }
@media (prefers-color-scheme: dark) {
  .card-icon { color: var(--color-primary-light); }
}
.card h3 { margin: 0 0 8px; font-size: 19px; letter-spacing: 0.01em; }
.card p { color: var(--color-text-secondary); font-size: 14px; margin: 0 0 16px; line-height: 1.65; }
.card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
  transition: gap var(--transition-fast);
}
a.card:hover .card-link { gap: 8px; color: var(--color-accent); }
.card.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--color-text-placeholder);
  background: transparent;
  border-style: dashed;
  border-color: var(--color-border-strong);
  box-shadow: none;
  font-size: 14px;
  min-height: 160px;
}
.card.placeholder:hover { transform: none; box-shadow: none; border-color: var(--color-border-strong); }
.card.placeholder .plus {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-full);
  border: 1.5px dashed var(--color-text-placeholder);
  position: relative;
}
.card.placeholder .plus::before,
.card.placeholder .plus::after {
  content: "";
  position: absolute;
  background: var(--color-text-placeholder);
  top: 50%; left: 50%;
}
.card.placeholder .plus::before { width: 12px; height: 1.5px; transform: translate(-50%,-50%); }
.card.placeholder .plus::after { width: 1.5px; height: 12px; transform: translate(-50%,-50%); }

/* ============ 正文页 ============ */
.page {
  padding-top: 52px;
  padding-bottom: 88px;
}
.page h1 {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 700;
  margin: 0 0 10px;
  letter-spacing: 0.01em;
  color: var(--color-primary-700);
}
@media (prefers-color-scheme: dark) {
  .page h1 { color: var(--color-text); }
}
.page .subtitle {
  color: var(--color-text-secondary);
  margin: 0 0 40px;
  font-size: 15px;
}
.section { margin-bottom: 44px; }
.section h2 {
  font-size: 21px;
  margin: 0 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--color-gold);
  color: var(--color-primary-dark);
  letter-spacing: 0.01em;
}
@media (prefers-color-scheme: dark) {
  .section h2 { color: var(--color-primary-light); }
}
.section h3 { font-size: 16px; margin: 20px 0 8px; color: var(--color-text); }
.section p, .section li { color: var(--color-text); font-size: 15.5px; }
.section ul, .section ol { padding-left: 22px; }
.section li { margin-bottom: 6px; }
.section li::marker { color: var(--color-accent); }
.section blockquote {
  margin: 20px 0;
  padding: 18px 22px;
  border-left: 3px solid var(--color-gold);
  background: var(--color-gold-100);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--color-primary-dark);
}
@media (prefers-color-scheme: dark) {
  .section blockquote { color: var(--color-text); }
}

/* ============ 法律文档专用排版 ============ */
.legal-doc { max-width: var(--content-width); }
.legal-doc > p { font-size: 15px; color: var(--color-text-secondary); }
.legal-doc h2 {
  font-size: 19px;
  margin-top: 40px;
  margin-bottom: 14px;
  padding: 0 0 0 16px;
  border-top: none;
  border-left: 4px solid var(--color-primary);
  color: var(--color-primary-dark);
  letter-spacing: 0.01em;
  line-height: 1.4;
}
@media (prefers-color-scheme: dark) {
  .legal-doc h2 { color: var(--color-primary-light); }
}
.legal-doc h2::first-letter { color: var(--color-accent); font-weight: 800; }
.legal-doc h2:first-of-type { margin-top: 8px; }
.legal-doc h3 { color: var(--color-text); font-size: 16px; margin: 22px 0 8px; }
.legal-doc p, .legal-doc li { font-size: 15px; line-height: 1.85; }
.legal-doc li::marker { color: var(--color-primary); }
.legal-doc li { margin-bottom: 8px; }
.legal-doc strong { color: var(--color-primary-dark); }
@media (prefers-color-scheme: dark) {
  .legal-doc strong { color: var(--color-primary-light); }
}
.legal-doc table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 18px 0;
  font-size: 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.legal-doc th, .legal-doc td {
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
}
.legal-doc th {
  background: var(--color-primary-50);
  color: var(--color-primary-dark);
  font-weight: 600;
}
@media (prefers-color-scheme: dark) {
  .legal-doc th { color: var(--color-text); }
}
.legal-doc tr:last-child td { border-bottom: none; }
.legal-doc th:last-child, .legal-doc td:last-child { border-right: none; }
.legal-doc tbody tr:hover td { background: var(--color-bg-sunken); }

.legal-doc .meta-bar {
  background: var(--color-bg-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 13.5px;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
  letter-spacing: 0.02em;
}
.legal-doc .kids-note {
  background: var(--color-gold-100);
  border: 1px solid var(--color-gold);
  border-left: 4px solid var(--color-gold);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 14.5px;
  margin: 18px 0;
  box-shadow: var(--shadow-xs);
}
.callout {
  background: var(--color-accent-100);
  border: 1px solid var(--color-accent);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 14.5px;
  margin: 22px 0;
  box-shadow: var(--shadow-xs);
}
.callout ul, .kids-note + ul { margin-bottom: 0; }

/* ============ 联系方式表 ============ */
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  padding: 13px 4px;
  border-bottom: 1px solid var(--color-border);
  font-size: 15px;
  transition: background var(--transition-fast);
  border-radius: 6px;
}
.contact-list li:hover { background: var(--color-bg-sunken); padding-left: 10px; padding-right: 10px; }
.contact-list li:last-child { border-bottom: none; }
.contact-list .label {
  color: var(--color-primary);
  min-width: 8em;
  font-weight: 600;
  font-size: 13.5px;
  letter-spacing: 0.02em;
}
@media (prefers-color-scheme: dark) { .contact-list .label { color: var(--color-primary-light); } }

/* ============ 页脚 ============ */
.site-footer {
  position: relative;
  border-top: 1px solid var(--color-border);
  padding: 36px 0 32px;
  font-size: 13px;
  color: var(--color-text-secondary);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold), var(--color-accent));
  opacity: 0.55;
}
.footer-links { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.footer-links a {
  color: var(--color-text-secondary);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.footer-links a:hover { color: var(--color-primary); border-color: var(--color-primary-light); }
.site-footer > .container > div:not(.footer-links) {
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--color-text-placeholder);
}

/* ============ 小工具类（营销页可选使用） ============ */
.eyebrow {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-accent-dark);
  background: var(--color-accent-100);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 18px;
}
@media (prefers-color-scheme: dark) {
  .eyebrow { color: #FF9478; }
}
.stat-row {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 40px 0 8px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}
.stat-row .stat { text-align: center; }
.stat-row .stat .num {
  display: block;
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary-700);
}
@media (prefers-color-scheme: dark) { .stat-row .stat .num { color: var(--color-primary-light); } }
.stat-row .stat .label { font-size: 13px; color: var(--color-text-secondary); }

@media (max-width: 640px) {
  .site-header .container { flex-direction: column; height: auto; padding: 12px 20px; gap: 10px; }
  .nav-links {
    width: 100%;
    gap: 2px;
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { white-space: nowrap; padding: 6px 12px; }
  .hero { padding: 56px 0 44px; }
  .hero::before { font-size: 200px; top: -4%; }
  .hero h1 { font-size: 26px; }
  .card { padding: 24px 20px; }
  .stat-row { gap: 20px; }
}