/* ============================================
 * 设计系统 · 东方韵味 × 极简权威
 * 离火赤 · 坤土金 · 乾白 · 深墨
 * ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;700;900&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

/* ---------- 变量 ---------- */
:root {
  /* 主色 */
  --c-primary: #C53D43;
  --c-primary-dim: #a83236;
  --c-primary-light: #e8686e;
  --c-primary-bg: rgba(197, 61, 67, 0.06);

  /* 辅色 */
  --c-secondary: #C5975B;
  --c-secondary-dim: #a87d44;
  --c-secondary-light: #dab47a;
  --c-secondary-bg: rgba(197, 151, 91, 0.08);

  /* 底色与墨色 */
  --c-bg: #F5F0E8;
  --c-bg-warm: #ede6d8;
  --c-surface: #fffdf8;
  --c-surface-elevated: #ffffff;
  --c-ink: #1a1a1a;
  --c-ink-soft: #3d3d3d;
  --c-ink-light: #6b6b6b;
  --c-ink-faint: #9a9a9a;
  --c-border: #e0d9cc;
  --c-border-strong: #c9c0ad;

  /* 字体 */
  --f-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --f-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* 字体层级 — 五级清晰 */
  --fs-h1: clamp(2.4rem, 5vw, 4.2rem);
  --fs-h2: clamp(1.8rem, 3.5vw, 2.8rem);
  --fs-h3: clamp(1.3rem, 2.5vw, 1.8rem);
  --fs-body: 1rem;
  --fs-caption: 0.8125rem;  /* 13px on desktop, but min 14px on mobile via breakpoint */
  --fs-h4: 1.125rem;
  --fs-h5: 0.9375rem;

  /* 行高 */
  --lh-tight: 1.15;
  --lh-snug: 1.3;
  --lh-normal: 1.6;
  --lh-relaxed: 1.75;
  --lh-loose: 1.85;

  /* 间距系统 — 7级 */
  --s-2xs: 0.25rem;
  --s-xs: 0.5rem;
  --s-sm: 1rem;
  --s-md: 2rem;
  --s-lg: 4rem;
  --s-xl: 6rem;
  --s-2xl: 9rem;

  /* 圆角 */
  --r-sm: 2px;
  --r-md: 4px;
  --r-lg: 8px;

  /* 过渡 */
  --t-fast: 0.2s ease;
  --t-base: 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  --t-slow: 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);

  /* 容器 */
  --max-w: 1320px;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(26, 26, 26, 0.06);
  --shadow-md: 0 4px 20px rgba(26, 26, 26, 0.08);
  --shadow-lg: 0 12px 48px rgba(26, 26, 26, 0.12);
  --shadow-primary: 0 8px 32px rgba(197, 61, 67, 0.15);

  /* 标准尺寸 */
  --btn-height: 44px;
  --row-height: 48px;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--f-sans);
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: var(--lh-relaxed);
  font-weight: 400;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* ---------- 背景纹理 ---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(197, 151, 91, 0.07), transparent 60%),
    radial-gradient(ellipse 70% 50% at 85% 85%, rgba(197, 61, 67, 0.05), transparent 60%);
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.4;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.1 0 0 0 0 0.1 0 0 0 0 0.1 0 0 0 0.04 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 排版五级层级 ---------- */
h1, h2, h3, h4, h5 {
  font-family: var(--f-serif);
  font-weight: 700;
  line-height: var(--lh-snug);
  letter-spacing: -0.01em;
  color: var(--c-ink);
}

h1 {
  font-size: var(--fs-h1);
  font-weight: 900;
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--fs-h2);
  font-weight: 900;
}

h3 {
  font-size: var(--fs-h3);
}

h4 {
  font-size: var(--fs-h4);
  line-height: var(--lh-normal);
}

h5 {
  font-size: var(--fs-h5);
  line-height: var(--lh-normal);
  font-weight: 500;
}

p {
  color: var(--c-ink-soft);
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
}

.caption {
  font-size: var(--fs-caption);
  color: var(--c-ink-light);
  line-height: var(--lh-normal);
}

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color var(--t-fast);
}
a:hover { color: var(--c-primary-dim); }

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-md);
  position: relative;
  z-index: 2;
}

.container-narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--s-md);
  position: relative;
  z-index: 2;
}

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 240, 232, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--c-border);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-family: var(--f-serif);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--c-ink);
  display: flex;
  align-items: center;
  gap: var(--s-xs);
  letter-spacing: 0.02em;
  line-height: 1;
  height: 36px;
}

.nav-logo .seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--c-primary);
  color: var(--c-bg);
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--r-sm);
  font-family: var(--f-serif);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: var(--s-md);
  list-style: none;
  align-items: center;
  height: 36px;
}

.nav-links li {
  display: flex;
  align-items: center;
  height: 100%;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--c-ink-soft);
  font-weight: 500;
  display: flex;
  align-items: center;
  height: 36px;
  transition: color var(--t-fast);
}

.nav-cta {
  display: flex;
  gap: var(--s-sm);
  align-items: center;
  height: 36px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--c-ink);
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

/* ---------- 按钮（统一44px高） ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-xs);
  min-height: var(--btn-height);
  padding: 0 var(--s-md);
  font-family: var(--f-sans);
  font-size: 0.92rem;
  font-weight: 500;
  border-radius: var(--r-sm);
  border: none;
  cursor: pointer;
  transition: all var(--t-base);
  position: relative;
  overflow: hidden;
  letter-spacing: 0.03em;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--c-primary);
  color: var(--c-bg);
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  background: var(--c-primary-dim);
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(197, 61, 67, 0.25);
}

.btn-secondary {
  background: transparent;
  color: var(--c-ink);
  border: 1px solid var(--c-border-strong);
}

.btn-secondary:hover {
  border-color: var(--c-secondary);
  color: var(--c-secondary-dim);
  background: var(--c-secondary-bg);
}

.btn-ghost {
  background: transparent;
  color: var(--c-ink-soft);
  padding: 0 var(--s-sm);
}

.btn-ghost:hover {
  color: var(--c-primary);
}

.btn-lg {
  min-height: 52px;
  padding: 0 var(--s-lg);
  font-size: 1rem;
}

.btn-sm {
  min-height: 36px;
  padding: 0 var(--s-sm);
  font-size: 0.85rem;
}

/* ---------- 卡片（统一padding） ---------- */
.card {
  background: var(--c-surface);
  border-radius: var(--r-md);
  padding: var(--s-md);
  position: relative;
  overflow: hidden;
  transition: all var(--t-base);
  border: 1px solid var(--c-border);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--c-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.card:hover::before {
  transform: scaleX(1);
}

.card-secondary::before { background: var(--c-secondary); }

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--s-2xs) var(--s-xs);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 100px;
  letter-spacing: 0.05em;
}

.tag-primary {
  background: var(--c-primary-bg);
  color: var(--c-primary);
}

.tag-secondary {
  background: var(--c-secondary-bg);
  color: var(--c-secondary-dim);
}

.tag-outline {
  border: 1px solid var(--c-border-strong);
  color: var(--c-ink-light);
}

/* ---------- 竖排标题装饰 ---------- */
.vertical-label {
  writing-mode: vertical-rl;
  font-family: var(--f-serif);
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--c-ink-faint);
  font-weight: 500;
}

/* ---------- 印章装饰 ---------- */
.seal-stamp {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--c-primary);
  color: var(--c-bg);
  font-family: var(--f-serif);
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: var(--r-sm);
  box-shadow: 0 4px 16px rgba(197, 61, 67, 0.25);
  position: relative;
  flex-shrink: 0;
}

.seal-stamp::after {
  content: '';
  position: absolute;
  inset: 3px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 2px;
}

/* ---------- 分割线 ---------- */
.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-border-strong), transparent);
  margin: var(--s-lg) 0;
}

.divider-vertical {
  width: 1px;
  height: 100%;
  background: linear-gradient(180deg, transparent, var(--c-border-strong), transparent);
}

/* ---------- 页脚 ---------- */
.footer {
  margin-top: var(--s-2xl);
  padding: var(--s-xl) 0 var(--s-lg);
  background: var(--c-bg-warm);
  border-top: 1px solid var(--c-border);
  position: relative;
  z-index: 2;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-md);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: var(--s-sm);
  align-items: stretch;
}

.footer-col {
  text-align: center;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--s-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 120px;
}

.footer-brand {
  font-family: var(--f-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: var(--s-sm);
  display: flex;
  align-items: center;
  gap: var(--s-xs);
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--c-ink-light);
  line-height: var(--lh-relaxed);
  max-width: 200px;
  text-align: center;
  margin: 0 auto;
}

.footer-col h4 {
  font-family: var(--f-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: var(--s-sm);
  letter-spacing: 0.05em;
  text-align: center;
}

.footer-col h4.brand {
  color: var(--c-primary);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--s-xs);
  align-items: center;
}

.footer-col a {
  font-size: 0.85rem;
  color: var(--c-ink-light);
  transition: color var(--t-fast);
}

.footer-col a:hover { color: var(--c-primary); }

.footer-bottom {
  max-width: var(--max-w);
  margin: var(--s-lg) auto 0;
  padding: var(--s-md) var(--s-md) 0;
  border-top: 1px solid var(--c-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--c-ink-faint);
}

/* ---------- 动画 ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes drawLine {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(197, 61, 67, 0.2); }
  50% { box-shadow: 0 0 24px 8px rgba(197, 61, 67, 0.08); }
}

.fade-up { animation: fadeUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) both; }
.fade-in { animation: fadeIn 1s ease both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ---------- 输入框 ---------- */
.input {
  width: 100%;
  padding: var(--s-xs) var(--s-sm);
  font-family: var(--f-sans);
  font-size: 0.92rem;
  color: var(--c-ink);
  background: var(--c-surface);
  border: 1px solid var(--c-border-strong);
  border-radius: var(--r-sm);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  outline: none;
  min-height: var(--btn-height);
}

.input:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(197, 61, 67, 0.1);
}

.input::placeholder { color: var(--c-ink-faint); }

/* ---------- 表格（统一48px行高） ---------- */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.table th {
  text-align: left;
  padding: 0 var(--s-sm);
  font-weight: 700;
  color: var(--c-ink);
  border-bottom: 2px solid var(--c-border-strong);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  height: var(--row-height);
  vertical-align: middle;
}

.table td {
  padding: 0 var(--s-sm);
  border-bottom: 1px solid var(--c-border);
  color: var(--c-ink-soft);
  height: var(--row-height);
  vertical-align: middle;
}

.table tbody tr {
  transition: background var(--t-fast);
}

.table tbody tr:hover {
  background: var(--c-primary-bg);
}

/* ---------- 工具类 ---------- */
.text-primary { color: var(--c-primary); }
.text-secondary { color: var(--c-secondary-dim); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-light { color: var(--c-ink-light); }
.text-faint { color: var(--c-ink-faint); }
.font-serif { font-family: var(--f-serif); }
.font-sans { font-family: var(--f-sans); }
.mt-sm { margin-top: var(--s-sm); }
.mt-md { margin-top: var(--s-md); }
.mt-lg { margin-top: var(--s-lg); }
.mt-xl { margin-top: var(--s-xl); }
.mb-sm { margin-bottom: var(--s-sm); }
.mb-md { margin-bottom: var(--s-md); }
.mb-lg { margin-bottom: var(--s-lg); }
.hidden { display: none !important; }

/* ---------- 响应式 ---------- */

/* 平板 1024px */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--s-md);
  }
  .footer-bottom {
    flex-direction: column;
    gap: var(--s-sm);
    text-align: center;
  }
}

/* 手机 768px — 核心断点 */
@media (max-width: 768px) {
  :root {
    --s-md: 1.5rem;
    --s-lg: 2.5rem;
    --s-xl: 4rem;
    --s-2xl: 6rem;
    --fs-body: 0.9375rem;
    --fs-caption: 0.875rem;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--s-md);
  }
  .hero-visual { display: none; }
  .hero-left { text-align: center; }
  .hero-subtitle { margin: 0 auto var(--s-md); }
  .hero-slogan { margin: 0 auto var(--s-md); }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; gap: var(--s-md); }
  .hero-title { font-size: clamp(1.5rem, 5vw, 2.5rem); }

  .nav-inner { padding: 0 var(--s-sm); height: 56px; }
  .nav-logo { font-size: 1.1rem; }
  .nav-logo .seal { width: 28px; height: 28px; font-size: 0.75rem; }
  .nav-cta-login { display: none; }
  .nav-cta-trial { display: none; }
  .nav-cta { gap: 0; }
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--c-surface);
    flex-direction: column;
    padding: var(--s-sm) var(--s-md);
    gap: var(--s-xs);
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-md);
    height: auto;
  }

  .nav-links.open { display: flex; }
  .nav-links li { height: 44px; width: 100%; }
  .nav-links a { width: 100%; height: 44px; padding: 0 var(--s-sm); }

  .nav-links-extra {
    display: flex;
    flex-direction: column;
    gap: var(--s-xs);
    padding-top: var(--s-xs);
    margin-top: var(--s-xs);
    border-top: 1px solid var(--c-border);
  }
  .nav-links-extra a {
    display: flex;
    align-items: center;
    height: 44px;
    padding: 0 var(--s-sm);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--r-sm);
  }
  .nav-links-extra .login { color: var(--c-ink-soft); border: 1px solid var(--c-border-strong); justify-content: center; }
  .nav-links-extra .trial { background: var(--c-primary); color: var(--c-bg); justify-content: center; }

  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--s-sm);
  }
  .feature-card { padding: var(--s-sm); }

  .flywheel-grid {
    grid-template-columns: 1fr;
    gap: var(--s-md);
  }
  .flywheel-circle { width: 240px; height: 240px; }
  .flywheel-node { width: 60px; height: 60px; font-size: 0.75rem; }
  .flywheel-center { width: 80px; height: 80px; font-size: 0.8rem; }

  .section-eyebrow { font-size: 0.75rem; }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--s-md);
    text-align: center;
  }
  .footer-col { text-align: center; }
  .footer-col ul { align-items: center; }
  .footer-bottom { flex-direction: column; gap: var(--s-xs); text-align: center; }

  .container { padding: 0 var(--s-sm); }
}

/* 小手机 480px */
@media (max-width: 480px) {
  /* 保持 html font-size 16px，确保所有文字 ≥ 14px */
  .container { padding: 0 var(--s-xs); }
  .btn {
    width: 100%;
    padding: 0 var(--s-sm);
  }
  .btn-sm {
    width: auto;
  }
}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--c-bg-warm); }
::-webkit-scrollbar-thumb { background: var(--c-border-strong); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-secondary); }

/* ---------- 选区 ---------- */
::selection { background: var(--c-primary); color: var(--c-bg); }

/* ===== AutoClaw: 响应式导航 ===== */
@media(max-width:768px){
  .nav-i{flex-wrap:wrap;height:auto;padding:8px 16px}
  .nav-i a.nv{display:none}
  .nav-i .hamburger{display:flex!important}
  .nav-i.open a.nv{display:block;width:100%;padding:8px 0;border-top:1px solid #eee}
  .nav-i.open .hamburger{position:absolute;right:16px;top:8px}
}
.hamburger{display:none;background:none;border:none;font-size:20px;cursor:pointer;padding:4px 8px;color:#1A1A2E;margin-left:auto}