/* ============================================================
   Character.AI 展示官网 · 共享样式
   设计：克制深色灰阶 + 薄荷绿点缀（与产品真实视觉一致）
   ============================================================ */

/* ---------- 1. 主题变量 ---------- */
:root {
  /* 背景层（深色为主） */
  --bg-1: #1A1A1A;          /* 顶部 / 侧栏 / Footer */
  --bg-2: #232323;          /* 主体内容区 */
  --bg-3: #2D2D2D;          /* 卡片 / 输入框 */
  --bg-4: #383838;          /* 卡片 hover / 选中 */
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);

  /* 文字色 */
  --text-1: #FFFFFF;        /* 主要文字 */
  --text-2: #B0B0B0;        /* 次要文字 */
  --text-3: #6B6B6B;        /* 提示 / 占位 */

  /* 强调点缀（克制使用） */
  --mint: #A8E6C9;          /* 薄荷绿（升级 / CTA 高亮） */
  --mint-strong: #5DD89A;   /* 饱和薄荷 */
  --orange: #FB923C;        /* 用户头像 */
  --bluegrey: #3B3B45;      /* 图标 hover */

  /* Hero 浅色段（兼容登录前营销视觉） */
  --hero-bg: #FAF7F2;
  --hero-accent: #D4A574;   /* 沙黄 */
  --hero-text: #1A1A1A;

  /* 圆角 */
  --r-pill: 9999px;
  --r-card: 16px;
  --r-small: 12px;

  /* 字体 */
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;

  /* 容器 */
  --container: 1240px;
  --gutter: 24px;

  /* 过渡 */
  --t-fast: 0.18s ease;
  --t-mid: 0.3s ease;
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-1);
  background: var(--bg-2);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; height: auto; }
a { color: inherit; text-decoration: none; transition: color var(--t-fast); }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; padding: 0; margin: 0; }
h1, h2, h3, h4, h5 { margin: 0 0 0.5em; font-weight: 700; line-height: 1.2; }
p { margin: 0 0 1em; }

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

/* ---------- 3. 头部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 26, 26, 0.92);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text-1);
  letter-spacing: -0.01em;
}
.brand img {
  width: 28px;
  height: 28px;
  border-radius: 8px;
}
.brand-text { white-space: nowrap; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-menu a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
  transition: background var(--t-fast), color var(--t-fast);
}
.nav-menu a i { font-size: 13px; opacity: 0.85; }
.nav-menu a:hover {
  background: var(--bg-3);
  color: var(--text-1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 语言切换器 */
.lang-switch { position: relative; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--bg-3);
  color: var(--text-1);
  border-radius: var(--r-pill);
  font-size: 13px;
  font-weight: 500;
  transition: background var(--t-fast);
}
.lang-btn:hover { background: var(--bg-4); }
.lang-btn i.fa-globe { font-size: 13px; }
.lang-btn .fa-chevron-down { font-size: 10px; opacity: 0.7; }

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 180px;
  background: var(--bg-3);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-small);
  padding: 6px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--t-fast), transform var(--t-fast), visibility var(--t-fast);
}
.lang-menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.lang-menu a {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-2);
  transition: background var(--t-fast), color var(--t-fast);
}
.lang-menu a:hover { background: var(--bg-4); color: var(--text-1); }
.lang-menu a.active { color: var(--mint); }

/* 头部按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--r-pill);
  white-space: nowrap;
  transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast), border-color var(--t-fast);
  border: 1px solid transparent;
  cursor: pointer;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--text-1); color: #1A1A1A; }
.btn-primary:hover { background: #f0f0f0; }
.btn-outline {
  background: transparent;
  color: var(--text-1);
  border-color: var(--border-strong);
}
.btn-outline:hover { background: var(--bg-3); border-color: var(--text-1); }
.btn-mint { background: var(--mint); color: #1A1A1A; }
.btn-mint:hover { background: var(--mint-strong); }
.btn-large { padding: 14px 28px; font-size: 16px; }
.btn-xl { padding: 18px 36px; font-size: 17px; }

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border-radius: 10px;
  background: var(--bg-3);
  color: var(--text-1);
  font-size: 18px;
}
.menu-toggle:hover { background: var(--bg-4); }

/* ---------- 4. Hero 区（浅色沙黄过渡到深色） ---------- */
.hero {
  position: relative;
  background: var(--hero-bg);
  color: var(--hero-text);
  overflow: hidden;
  padding: 80px 0 96px;
}
.hero::before {
  /* 沙黄柔光装饰 */
  content: "";
  position: absolute;
  inset: -10% -10% auto auto;
  width: 60vw; height: 60vw;
  max-width: 760px; max-height: 760px;
  background: radial-gradient(closest-side, rgba(212, 165, 116, 0.55), transparent 70%);
  filter: blur(40px);
  z-index: 0;
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  left: -8%; bottom: -20%;
  width: 50vw; height: 50vw;
  max-width: 620px; max-height: 620px;
  background: radial-gradient(closest-side, rgba(255, 200, 130, 0.35), transparent 70%);
  filter: blur(50px);
  z-index: 0;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(26, 26, 26, 0.06);
  border-radius: var(--r-pill);
  font-size: 13px;
  font-weight: 600;
  color: #5b4a36;
  margin-bottom: 22px;
}
.hero-eyebrow i { color: var(--hero-accent); }
.hero h1 {
  font-size: clamp(36px, 5.6vw, 68px);
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-bottom: 18px;
}
.hero h1 .accent {
  display: inline-block;
  position: relative;
  padding: 0 6px;
}
.hero h1 .accent::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 6px;
  height: 14px;
  background: var(--hero-accent);
  opacity: 0.45;
  z-index: -1;
  border-radius: 4px;
}
.hero p.lead {
  font-size: 18px;
  color: #4a4034;
  max-width: 560px;
  margin-bottom: 28px;
}
.hero .cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.hero .btn-primary { background: #1A1A1A; color: #FFF; }
.hero .btn-primary:hover { background: #333; }
.hero .btn-outline { color: #1A1A1A; border-color: rgba(26, 26, 26, 0.2); }
.hero .btn-outline:hover { background: rgba(26, 26, 26, 0.06); border-color: #1A1A1A; }
.hero-meta {
  display: flex; gap: 20px; flex-wrap: wrap;
  margin-top: 24px;
  font-size: 13px;
  color: #6b6052;
}
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }
.hero-meta i { color: var(--hero-accent); }

/* Hero 中央登录卡片 */
.hero-card {
  background: #FFFFFF;
  border-radius: 24px;
  padding: 32px 28px;
  box-shadow: 0 30px 80px rgba(80, 60, 30, 0.18), 0 8px 24px rgba(80, 60, 30, 0.08);
  position: relative;
  border: 1px solid rgba(0, 0, 0, 0.04);
}
.hero-card::before {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 26px;
  background: linear-gradient(135deg, rgba(212, 165, 116, 0.2), transparent 60%);
  z-index: -1;
}
.hero-card .avatar-cluster {
  display: flex;
  margin-bottom: 18px;
}
.hero-card .avatar-cluster .avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 3px solid #FFFFFF;
  margin-left: -10px;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; color: #FFFFFF; font-size: 14px;
}
.hero-card .avatar-cluster .avatar:first-child { margin-left: 0; }
.hero-card h3 {
  font-size: 22px;
  margin-bottom: 6px;
  color: #1A1A1A;
}
.hero-card .desc {
  color: #6b6052; font-size: 14px; margin-bottom: 22px;
}
.login-options { display: grid; gap: 10px; }
.login-options a {
  display: flex; align-items: center; justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  background: #FFFFFF;
  color: #1A1A1A;
  border: 1px solid #E5E0D8;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: 14px;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
.login-options a:hover {
  background: #F8F4ED;
  border-color: #1A1A1A;
}
.login-options a i { font-size: 16px; }
.login-options a.google i { color: #DB4437; }
.login-options a.apple i { color: #1A1A1A; }
.login-options a.email i { color: var(--hero-accent); }
.login-foot {
  text-align: center;
  margin-top: 18px;
  font-size: 12px;
  color: #8a7e6c;
}

/* ---------- 5. 通用 Section 容器 ---------- */
.section { padding: 96px 0; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  background: var(--bg-3);
  color: var(--mint);
  border-radius: var(--r-pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.section h2 {
  font-size: clamp(30px, 3.6vw, 46px);
  letter-spacing: -0.015em;
  margin-bottom: 14px;
}
.section .section-sub {
  color: var(--text-2);
  font-size: 17px;
  max-width: 620px;
  margin: 0 auto;
}

/* ---------- 6. Features ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feature-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 28px 26px;
  transition: background var(--t-fast), transform var(--t-fast), border-color var(--t-fast);
}
.feature-card:hover {
  background: var(--bg-4);
  transform: translateY(-2px);
  border-color: var(--border-strong);
}
.feature-icon {
  width: 48px; height: 48px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(168, 230, 201, 0.12);
  color: var(--mint);
  border-radius: var(--r-small);
  font-size: 20px;
  margin-bottom: 18px;
}
.feature-card h3 { font-size: 19px; margin-bottom: 8px; }
.feature-card p { color: var(--text-2); font-size: 14.5px; margin: 0; }

/* ---------- 7. Scenes ---------- */
.scenes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.scene-card {
  position: relative;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 32px 24px;
  text-align: left;
  overflow: hidden;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
.scene-card::before {
  content: "";
  position: absolute;
  top: 0; right: 0;
  width: 140px; height: 140px;
  background: radial-gradient(closest-side, rgba(168, 230, 201, 0.18), transparent 70%);
  pointer-events: none;
  opacity: 0; transition: opacity var(--t-mid);
}
.scene-card:hover { background: var(--bg-4); border-color: var(--border-strong); transform: translateY(-2px); }
.scene-card:hover::before { opacity: 1; }
.scene-card .num {
  font-size: 12px; font-weight: 700; color: var(--text-3); letter-spacing: 0.1em;
  margin-bottom: 14px;
}
.scene-card .icon {
  width: 44px; height: 44px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--r-small);
  background: var(--bg-2);
  color: var(--mint);
  font-size: 19px;
  margin-bottom: 14px;
}
.scene-card h3 { font-size: 18px; margin-bottom: 6px; }
.scene-card p { color: var(--text-2); font-size: 14px; margin: 0; }

/* ---------- 8. 角色画廊 Gallery ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.char-card {
  position: relative;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  text-align: left;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
  color: inherit;
}
.char-card:hover { background: var(--bg-4); border-color: var(--border-strong); transform: translateY(-2px); }
.char-avatar {
  flex-shrink: 0;
  width: 64px; height: 64px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700;
  color: #FFFFFF;
  font-size: 22px;
  letter-spacing: -0.02em;
}
.char-info { min-width: 0; flex: 1; }
.char-info h4 {
  font-size: 16px; margin-bottom: 4px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.char-info .char-tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 11px;
  font-weight: 600;
  background: var(--bg-2);
  color: var(--text-2);
  border-radius: var(--r-pill);
  margin-bottom: 6px;
}
.char-info .char-meta {
  display: flex; align-items: center; gap: 6px;
  color: var(--text-3); font-size: 13px;
}
.char-info .char-meta i { font-size: 11px; }

.gallery-foot { text-align: center; margin-top: 36px; }

/* 头像背景色 */
.avatar-bg-orange { background: var(--orange); }
.avatar-bg-mint { background: var(--mint-strong); color: #1A1A1A; }
.avatar-bg-blue { background: #60A5FA; }
.avatar-bg-purple { background: #A78BFA; }
.avatar-bg-pink { background: #F472B6; }
.avatar-bg-rose { background: #FB7185; }
.avatar-bg-amber { background: #FBBF24; color: #1A1A1A; }
.avatar-bg-cyan { background: #22D3EE; color: #1A1A1A; }
.avatar-bg-lime { background: #84CC16; color: #1A1A1A; }

/* ---------- 9. Stats ---------- */
.stats {
  background: var(--bg-1);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 64px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px;
  text-align: center;
}
.stat-num {
  font-size: clamp(34px, 4.4vw, 52px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-1);
  margin-bottom: 6px;
  line-height: 1;
}
.stat-num .unit { color: var(--mint); margin-left: 4px; font-size: 0.6em; vertical-align: middle; }
.stat-label { color: var(--text-2); font-size: 14px; }

/* ---------- 10. Testimonials ---------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.testimonial {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 28px;
  display: flex; flex-direction: column;
  transition: background var(--t-fast), border-color var(--t-fast);
}
.testimonial:hover { background: var(--bg-4); border-color: var(--border-strong); }
.testimonial .quote-mark {
  color: var(--mint);
  font-size: 26px;
  margin-bottom: 10px;
}
.testimonial .text {
  color: var(--text-1);
  font-size: 15px;
  margin-bottom: 22px;
  flex: 1;
  line-height: 1.6;
}
.testimonial .author {
  display: flex; align-items: center; gap: 12px;
}
.testimonial .author .avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; color: #FFFFFF; font-size: 16px;
}
.testimonial .author .name { font-weight: 600; color: var(--text-1); font-size: 14px; }
.testimonial .author .role { font-size: 12px; color: var(--text-3); }

/* ---------- 11. FAQ ---------- */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: grid; gap: 12px;
}
.faq-item {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  overflow: hidden;
  transition: background var(--t-fast), border-color var(--t-fast);
}
.faq-item:hover { border-color: var(--border-strong); }
.faq-item.open { background: var(--bg-4); border-color: var(--border-strong); }
.faq-q {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 26px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  gap: 16px;
}
.faq-q .q-icon {
  flex-shrink: 0;
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--bg-2);
  color: var(--text-2);
  transition: transform var(--t-mid), color var(--t-fast), background var(--t-fast);
  font-size: 13px;
}
.faq-item.open .q-icon {
  transform: rotate(180deg);
  color: var(--mint);
  background: rgba(168, 230, 201, 0.12);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 26px;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.7;
}
.faq-item.open .faq-a {
  max-height: 480px;
  padding: 0 26px 24px;
}

/* ---------- 12. CTA ---------- */
.cta-section {
  padding: 96px 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(168, 230, 201, 0.10), transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(168, 230, 201, 0.08), transparent 55%),
    var(--bg-1);
  text-align: center;
  border-top: 1px solid var(--border);
}
.cta-section h2 {
  font-size: clamp(32px, 4.4vw, 56px);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.cta-section p {
  color: var(--text-2);
  font-size: 18px;
  max-width: 580px;
  margin: 0 auto 32px;
}
.cta-section .btn {
  font-size: 17px;
  padding: 18px 40px;
  background: var(--mint);
  color: #1A1A1A;
}
.cta-section .btn:hover { background: var(--mint-strong); }
.cta-foot {
  margin-top: 18px;
  font-size: 13px;
  color: var(--text-3);
  display: inline-flex; gap: 18px; align-items: center; flex-wrap: wrap;
  justify-content: center;
}
.cta-foot span { display: inline-flex; align-items: center; gap: 6px; }
.cta-foot i { color: var(--mint); }

/* ---------- 13. Footer ---------- */
.site-footer {
  background: var(--bg-1);
  color: var(--text-2);
  padding: 64px 0 24px;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand { max-width: 360px; }
.footer-brand .brand { margin-bottom: 14px; color: var(--text-1); }
.footer-brand p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.65;
}
.footer-col h5 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-1);
  margin-bottom: 16px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  font-size: 14px;
  color: var(--text-2);
  transition: color var(--t-fast);
}
.footer-col ul a:hover { color: var(--text-1); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-3);
}
.footer-legal { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-legal a { color: var(--text-3); }
.footer-legal a:hover { color: var(--text-1); }

/* ---------- 14. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--bg-3);
  border: 1px solid var(--border-strong);
  color: var(--text-1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--t-fast), visibility var(--t-fast), transform var(--t-fast), background var(--t-fast);
  z-index: 90;
  font-size: 14px;
}
.to-top:hover { background: var(--bg-4); }
.to-top.show {
  opacity: 1; visibility: visible; transform: translateY(0);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .scenes-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; max-width: none; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-card { max-width: 460px; margin: 0 auto; }
}

@media (max-width: 720px) {
  .nav-menu, .nav-actions .desktop-only { display: none; }
  .menu-toggle { display: inline-flex; }
  .nav { height: 60px; }

  .section { padding: 64px 0; }
  .section-head { margin-bottom: 36px; }

  .features-grid,
  .scenes-grid,
  .gallery-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .footer-grid { grid-template-columns: 1fr; }

  .hero { padding: 56px 0 64px; }
  .hero-card { display: none; }

  .nav-actions .lang-btn .lang-text { display: none; }

  /* 移动菜单下拉 */
  .mobile-nav {
    position: fixed;
    top: 60px;
    left: 0; right: 0;
    background: var(--bg-1);
    border-bottom: 1px solid var(--border);
    padding: 12px 16px 20px;
    display: none;
    z-index: 99;
  }
  .mobile-nav.open { display: block; }
  .mobile-nav a {
    display: flex; align-items: center; gap: 10px;
    padding: 14px 12px;
    color: var(--text-2);
    border-radius: 10px;
    font-size: 15px;
  }
  .mobile-nav a:hover { background: var(--bg-3); color: var(--text-1); }
  .mobile-nav .mobile-cta { margin-top: 12px; display: grid; gap: 8px; }
  .mobile-nav .mobile-cta .btn { width: 100%; padding: 12px 18px; }
}

@media (min-width: 721px) {
  .menu-toggle, .mobile-nav { display: none; }
}

/* ---------- 16. 焦点态 / 无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ---------- 17. 减弱动画 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================================
   18. 内页（FAQ / 用户手册 / 法律页等）
   ============================================================ */

/* 内页顶部 Hero（深色，比首页 Hero 更紧凑） */
.page-hero {
  position: relative;
  background: var(--bg-1);
  padding: 88px 0 56px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  top: -30%; right: -10%;
  width: 50vw; height: 50vw;
  max-width: 600px; max-height: 600px;
  background: radial-gradient(closest-side, rgba(168, 230, 201, 0.10), transparent 70%);
  pointer-events: none;
  filter: blur(20px);
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 18px;
}
.page-hero .breadcrumb a {
  color: var(--text-2);
  transition: color var(--t-fast);
}
.page-hero .breadcrumb a:hover { color: var(--text-1); }
.page-hero .breadcrumb i { font-size: 9px; opacity: 0.5; }
.page-hero .page-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  background: var(--bg-3);
  color: var(--mint);
  border-radius: var(--r-pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.page-hero h1 {
  font-size: clamp(32px, 4.4vw, 52px);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.page-hero .lead {
  color: var(--text-2);
  font-size: 17px;
  max-width: 720px;
  margin: 0;
}
.page-hero .last-updated {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  font-size: 13px;
  color: var(--text-3);
  padding: 6px 14px;
  background: var(--bg-3);
  border-radius: var(--r-pill);
}
.page-hero .last-updated i { color: var(--mint); }

/* 内页主体 */
.page-body { padding: 64px 0 96px; background: var(--bg-2); }

/* 文章/法律页 排版 */
.article-wrap {
  max-width: 880px;
  margin: 0 auto;
  color: var(--text-2);
  font-size: 16px;
  line-height: 1.75;
}
.article-wrap h2 {
  color: var(--text-1);
  font-size: 26px;
  margin: 56px 0 14px;
  letter-spacing: -0.01em;
  scroll-margin-top: 80px;
}
.article-wrap h2:first-child { margin-top: 0; }
.article-wrap h2 .num {
  display: inline-block;
  margin-right: 10px;
  color: var(--mint);
  font-weight: 800;
}
.article-wrap h3 {
  color: var(--text-1);
  font-size: 19px;
  margin: 32px 0 10px;
}
.article-wrap p { margin: 0 0 16px; }
.article-wrap a {
  color: var(--text-1);
  text-decoration: underline;
  text-decoration-color: var(--mint);
  text-underline-offset: 3px;
}
.article-wrap a:hover { color: var(--mint); }
.article-wrap ul, .article-wrap ol {
  margin: 0 0 18px;
  padding-left: 24px;
  list-style: revert;
}
.article-wrap li { margin-bottom: 8px; }
.article-wrap li::marker { color: var(--mint); }
.article-wrap blockquote {
  margin: 22px 0;
  padding: 16px 22px;
  background: var(--bg-3);
  border-left: 3px solid var(--mint);
  border-radius: 0 var(--r-small) var(--r-small) 0;
  color: var(--text-2);
  font-style: italic;
}
.article-wrap code {
  padding: 2px 8px;
  background: var(--bg-3);
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  color: var(--mint);
}
.article-wrap hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 40px 0;
}
.article-wrap .callout {
  display: flex;
  gap: 14px;
  padding: 18px 22px;
  background: var(--bg-3);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-card);
  margin: 22px 0;
  color: var(--text-1);
}
.article-wrap .callout i {
  flex-shrink: 0;
  color: var(--mint);
  font-size: 20px;
  margin-top: 2px;
}
.article-wrap .callout > div { margin: 0; }
.article-wrap .callout p:last-child { margin-bottom: 0; }
.article-wrap .callout strong { color: var(--text-1); }

/* 用户手册 / 文章 + 目录布局 */
.guide-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 56px;
  align-items: start;
}
.toc {
  position: sticky;
  top: 80px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 22px 18px;
  font-size: 14px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}
.toc h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin: 0 0 12px;
  padding: 0 6px;
}
.toc ul { display: grid; gap: 2px; }
.toc a {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text-2);
  font-size: 14px;
  transition: background var(--t-fast), color var(--t-fast);
  line-height: 1.4;
}
.toc a:hover, .toc a.active {
  background: var(--bg-4);
  color: var(--text-1);
}

/* 联系卡片网格（用于 support 页） */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 40px 0;
}
.contact-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 28px 26px;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
.contact-card:hover {
  background: var(--bg-4);
  border-color: var(--border-strong);
  transform: translateY(-2px);
}
.contact-card .icon {
  width: 48px; height: 48px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(168, 230, 201, 0.12);
  color: var(--mint);
  border-radius: var(--r-small);
  font-size: 20px;
  margin-bottom: 16px;
}
.contact-card h3 {
  color: var(--text-1);
  font-size: 18px;
  margin-bottom: 6px;
}
.contact-card p {
  color: var(--text-2);
  font-size: 14.5px;
  margin: 0 0 12px;
}
.contact-card a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--mint);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
}
.contact-card a:hover { color: var(--mint-strong); }

/* 信息条（小时 / 响应时间） */
.info-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 32px 0;
}
.info-row .info-item {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 22px;
  text-align: center;
}
.info-row .info-item .label {
  color: var(--text-3); font-size: 13px;
  text-transform: uppercase; letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.info-row .info-item .val {
  color: var(--text-1); font-size: 20px; font-weight: 700;
}

/* 反馈表单 */
.feedback-form {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 32px 28px;
  display: grid;
  gap: 18px;
  margin: 40px 0;
}
.feedback-form .form-row {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr 1fr;
}
.feedback-form .form-group { display: grid; gap: 6px; }
.feedback-form label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-1);
}
.feedback-form label .req { color: var(--mint); margin-left: 2px; }
.feedback-form input,
.feedback-form select,
.feedback-form textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-small);
  color: var(--text-1);
  font: inherit;
  font-size: 14.5px;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.feedback-form textarea {
  min-height: 140px;
  resize: vertical;
  line-height: 1.55;
}
.feedback-form input:focus,
.feedback-form select:focus,
.feedback-form textarea:focus {
  outline: none;
  border-color: var(--mint);
  background: var(--bg-1);
}
.feedback-form input::placeholder,
.feedback-form textarea::placeholder { color: var(--text-3); }
.feedback-form .form-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}
.feedback-form .form-note {
  font-size: 12px; color: var(--text-3);
}
.feedback-form button[type="submit"] {
  background: var(--mint);
  color: #1A1A1A;
  border: none;
  padding: 12px 28px;
  border-radius: var(--r-pill);
  font-weight: 700;
  cursor: pointer;
  transition: background var(--t-fast);
}
.feedback-form button[type="submit"]:hover { background: var(--mint-strong); }

.form-success {
  margin-top: 16px;
  padding: 14px 18px;
  background: rgba(168, 230, 201, 0.12);
  border: 1px solid rgba(168, 230, 201, 0.25);
  border-radius: var(--r-card);
  color: var(--mint);
  font-size: 14.5px;
  display: none;
  align-items: center;
  gap: 10px;
}
.form-success.show { display: flex; }
.form-success i { font-size: 18px; }

/* 内页响应式 */
@media (max-width: 1080px) {
  .guide-layout { grid-template-columns: 1fr; gap: 28px; }
  .toc { position: static; max-height: none; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .info-row { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 720px) {
  .page-hero { padding: 56px 0 36px; }
  .page-body { padding: 40px 0 64px; }
  .article-wrap h2 { font-size: 22px; margin: 40px 0 12px; }
  .article-wrap h3 { font-size: 17px; }
  .contact-grid { grid-template-columns: 1fr; }
  .info-row { grid-template-columns: 1fr; }
  .feedback-form { padding: 22px 18px; }
  .feedback-form .form-row { grid-template-columns: 1fr; }
}