/* ==========================================================================
   红杏云 (HongXing Cloud) - 东方羊脂玉与朱砂印尊享设计系统
   Mutton-fat Jade & Cinnabar-Seal Luxury Tactile Design System
   纯原生CSS | 零外部库 | 秒开极速 | 昼夜无缝切换 | 响应式单栏适配
   ========================================================================== */

:root {
  /* 东方羊脂白玉与朱砂印配色 (Daylight Mode: Mutton-Fat Jade Ivory & Cinnabar Seal) */
  --bg-body: #fbfbfa;                        /* 羊脂白玉温润象牙底色 */
  --bg-body-subtle: #f4f4f0;
  --bg-slab: #ffffff;                         /* 羊脂玉厚重面板 */
  --bg-slab-translucent: rgba(255, 255, 255, 0.88);
  --bg-slab-hover: #ffffff;
  --bg-slab-inset: #f7f7f4;

  /* 文字系统：岩石墨黛与石刻金石色 */
  --text-primary: #1a1a1e;                    /* 生石墨深黛色 (Raw Slate Graphite) */
  --text-secondary: #4a4a52;                  /* 墨灰中度色 */
  --text-muted: #848490;                      /* 浅石灰辅助色 */
  --text-inverse: #fbfbfa;

  /* 朱砂印正色 (Authentic Cinnabar-Seal Vermilion) */
  --cinnabar: #d90429;                        /* 正宗朱砂印泥红 */
  --cinnabar-hover: #b80322;                  /* 熟朱砂深红 */
  --cinnabar-subtle: rgba(217, 4, 41, 0.08);  /* 浅朱砂水色 */
  --cinnabar-glow: rgba(217, 4, 41, 0.22);
  --cinnabar-border: rgba(217, 4, 41, 0.18);
  --seal-red-dark: #90021b;

  /* 羊脂白玉次生散射 (Subsurface Scattering - SSS) 光学质感阴影与漫反射边缘 */
  --jade-border: rgba(218, 215, 205, 0.65);
  --jade-rim-light: inset 0 1px 1px 0 rgba(255, 255, 255, 0.95), inset 0 0 0 1px rgba(255, 255, 255, 0.6);
  --slab-shadow-sm: 0 2px 8px -2px rgba(26, 26, 30, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
  --slab-shadow-md: 0 8px 24px -4px rgba(26, 26, 30, 0.06), 0 2px 6px -1px rgba(0, 0, 0, 0.03), inset 0 1px 0 rgba(255, 255, 255, 0.9);
  --slab-shadow-heavy: 0 16px 40px -8px rgba(26, 26, 30, 0.08), 0 4px 12px -2px rgba(217, 4, 41, 0.03), inset 0 1px 0 rgba(255, 255, 255, 0.95);
  --slab-shadow-hover: 0 24px 50px -10px rgba(26, 26, 30, 0.12), 0 6px 18px -3px rgba(217, 4, 41, 0.08), inset 0 1px 1px rgba(255, 255, 255, 1);

  /* 边框圆角 */
  --radius-sm: 6px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 9999px;

  --header-height: 74px;
  --transition-smooth: all 0.28s cubic-bezier(0.25, 1, 0.5, 1);
}

/* ==========================================================================
   夜间墨玉/玄黛模式 (Dark Mode: Black Nephrite & Cinnabar Vein)
   ========================================================================== */
[data-theme="dark"] {
  --bg-body: #0d0f14;                        /* 墨玉玄黛底色 */
  --bg-body-subtle: #13161f;
  --bg-slab: #161922;                         /* 深色厚玉面板 */
  --bg-slab-translucent: rgba(22, 25, 34, 0.88);
  --bg-slab-hover: #1b202c;
  --bg-slab-inset: #11131a;

  --text-primary: #f5f5f7;
  --text-secondary: #b5b7c2;
  --text-muted: #6e7282;
  --text-inverse: #0d0f14;

  --cinnabar: #ef233c;                        /* 夜间模式朱砂微亮 */
  --cinnabar-hover: #d90429;
  --cinnabar-subtle: rgba(239, 35, 60, 0.12);
  --cinnabar-glow: rgba(239, 35, 60, 0.35);
  --cinnabar-border: rgba(239, 35, 60, 0.28);

  --jade-border: rgba(255, 255, 255, 0.08);
  --jade-rim-light: inset 0 1px 1px 0 rgba(255, 255, 255, 0.12), inset 0 0 0 1px rgba(255, 255, 255, 0.04);
  --slab-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --slab-shadow-md: 0 10px 28px -4px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --slab-shadow-heavy: 0 20px 48px -8px rgba(0, 0, 0, 0.65), 0 0 30px rgba(239, 35, 60, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  --slab-shadow-hover: 0 28px 60px -10px rgba(0, 0, 0, 0.75), 0 0 35px rgba(239, 35, 60, 0.12), inset 0 1px 1px rgba(255, 255, 255, 0.12);
}

/* ==========================================================================
   全局重置与东方字体排版
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Serif SC", serif, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.68;
  font-size: 16px;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
  letter-spacing: 0.2px;
}

/* 石刻风等宽遥测字体 */
.telemetry-font, .code-slab {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, "Courier New", monospace;
  letter-spacing: 0.5px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

img, svg {
  display: block;
  max-width: 100%;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* 页面通用容器 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 28px;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 60px;
}

/* 东方朱砂印记标签 */
.seal-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 16px;
  background: var(--bg-slab);
  border: 1px solid var(--cinnabar-border);
  color: var(--cinnabar);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
  box-shadow: var(--slab-shadow-sm);
}

.seal-tag::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--cinnabar);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--cinnabar);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.6px;
  margin-bottom: 18px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.06rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ==========================================================================
   玉石板架构 (Nephrite Slab Architecture)
   ========================================================================== */
.jade-slab {
  background: var(--bg-slab);
  border: 1px solid var(--jade-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--slab-shadow-heavy), var(--jade-rim-light);
  position: relative;
  transition: var(--transition-smooth);
}

.jade-slab:hover {
  box-shadow: var(--slab-shadow-hover), var(--jade-rim-light);
  border-color: rgba(217, 4, 41, 0.25);
  transform: translateY(-4px);
}

/* ==========================================================================
   朱砂印雕刻按钮 (Intaglio Seal Action Buttons)
   2px mechanical stone-press depression micro-interaction
   ========================================================================== */
.btn-seal-stamp {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 34px;
  background: linear-gradient(145deg, #e6052f 0%, #d90429 60%, #ba0221 100%);
  color: #ffffff !important;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.8px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 6px 18px -2px var(--cinnabar-glow), 
              inset 0 1px 0 rgba(255, 255, 255, 0.35), 
              inset 0 -2px 0 rgba(0, 0, 0, 0.2);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.2s ease;
  cursor: pointer;
  user-select: none;
  position: relative;
}

.btn-seal-stamp:hover {
  background: linear-gradient(145deg, #f00935 0%, #e0052c 60%, #c40426 100%);
  box-shadow: 0 8px 24px -2px var(--cinnabar-glow), 
              inset 0 1px 0 rgba(255, 255, 255, 0.45), 
              inset 0 -2px 0 rgba(0, 0, 0, 0.25);
  transform: translateY(-1px);
}

/* 点击触发 2px 机械玉石下压阻尼感 (2px mechanical stone-press depression) */
.btn-seal-stamp:active {
  transform: translateY(2px) !important;
  box-shadow: 0 2px 6px -1px var(--cinnabar-glow), 
              inset 0 2px 3px rgba(0, 0, 0, 0.3) !important;
}

/* 次级羊脂玉素钮 */
.btn-jade-plain {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 30px;
  background: var(--bg-slab);
  color: var(--text-primary);
  font-size: 1.02rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--jade-border);
  box-shadow: var(--slab-shadow-sm), var(--jade-rim-light);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.2s ease;
}

.btn-jade-plain:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  transform: translateY(-1px);
  box-shadow: var(--slab-shadow-md);
}

.btn-jade-plain:active {
  transform: translateY(2px) !important;
  box-shadow: inset 0 2px 3px rgba(0, 0, 0, 0.08) !important;
}

/* ==========================================================================
   页眉 Header 与动态过渡导航
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-slab-translucent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--jade-border);
  box-shadow: 0 2px 14px rgba(0, 0, 0, 0.02);
  z-index: 1000;
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* 品牌官方图徽 Logo (已去网址纯享版) */
.brand-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.brand-logo:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.brand-logo-img {
  height: 42px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  display: block;
  transition: filter 0.3s ease;
}

/* 夜间模式下增加微量明暗映射，保证深海蓝与红花水纹深邃透光 */
[data-theme="dark"] .brand-logo-img {
  filter: drop-shadow(0 0 1px rgba(255, 255, 255, 0.8)) brightness(1.08);
}

/* 导航栏目录（包含首页 + 每个板块 + 推荐资讯） */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--cinnabar);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--cinnabar);
  border-radius: 2px;
  transition: width 0.25s cubic-bezier(0.25, 1, 0.5, 1);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

/* ‘推荐资讯’ 特色高亮徽标 */
.nav-link-highlight {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--cinnabar) !important;
  font-weight: 700;
}

.nav-badge-hot {
  font-size: 0.68rem;
  padding: 1px 6px;
  background: var(--cinnabar);
  color: #fff;
  border-radius: 3px;
  line-height: 1.4;
  letter-spacing: 0.5px;
}

/* 右侧操作区：昼夜切换 + CTA */
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 昼夜模式切换按钮（精致透光玉石质感） */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-slab);
  border: 1px solid var(--jade-border);
  color: var(--text-primary);
  box-shadow: var(--slab-shadow-sm), var(--jade-rim-light);
  transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  transform: translateY(-1px);
}

.theme-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.35s ease;
}

.icon-sun { display: block; }
.icon-moon { display: none; }

[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.btn-nav-seal {
  padding: 8px 18px;
  font-size: 0.88rem;
  letter-spacing: 0.5px;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  padding: 6px;
  border-radius: var(--radius-sm);
  background: var(--bg-slab);
  border: 1px solid var(--jade-border);
}

.mobile-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-primary);
  border-radius: 1px;
}

/* ==========================================================================
   主视觉区 (Hero Section)
   大标题必须包含“红杏云”
   ========================================================================== */
.hero-section {
  padding: 168px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* 东方温润玉石透光背景散射 (SSS Glow) */
.hero-sss-glow {
  position: absolute;
  top: 5%;
  left: 50%;
  transform: translateX(-50%);
  width: 760px;
  height: 440px;
  background: radial-gradient(circle, rgba(217, 4, 41, 0.08) 0%, rgba(218, 215, 205, 0.25) 45%, transparent 70%);
  filter: blur(55px);
  z-index: -1;
  pointer-events: none;
}

.hero-seal-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 22px;
  border-radius: var(--radius-pill);
  background: var(--bg-slab);
  border: 1px solid var(--jade-border);
  box-shadow: var(--slab-shadow-sm), var(--jade-rim-light);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.cinnabar-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cinnabar);
  box-shadow: 0 0 10px var(--cinnabar);
}

/* 醒目大标题（包含品牌名‘红杏云’） */
.hero-headline {
  font-size: 3.6rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1.2px;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.hero-headline .brand-highlight {
  color: var(--cinnabar);
  position: relative;
  display: inline-block;
}

.hero-headline .brand-highlight::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 0;
  right: 0;
  height: 8px;
  background: rgba(217, 4, 41, 0.12);
  z-index: -1;
  border-radius: 4px;
}

/* 简介说明 */
.hero-intro {
  font-size: 1.22rem;
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 42px;
  line-height: 1.82;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 54px;
  flex-wrap: wrap;
}

/* 石刻风指标条 (Monospace Telemetry Ribbon) */
.telemetry-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 980px;
  margin: 0 auto;
  padding: 24px;
  background: var(--bg-slab);
  border: 1px solid var(--jade-border);
  border-radius: var(--radius-md);
  box-shadow: var(--slab-shadow-md), var(--jade-rim-light);
}

.telemetry-item {
  text-align: center;
  border-right: 1px solid var(--jade-border);
}

.telemetry-item:last-child {
  border-right: none;
}

.telemetry-val {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.telemetry-val .unit {
  font-size: 0.95rem;
  color: var(--cinnabar);
  margin-left: 2px;
}

.telemetry-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

/* ==========================================================================
   产品核心优势介绍 (3个图文玉石板卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-slab {
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
}

.feature-seal-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--cinnabar-subtle);
  border: 1px solid var(--cinnabar-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cinnabar);
  margin-bottom: 24px;
}

.feature-title {
  font-size: 1.32rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.72;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-checklist {
  border-top: 1px solid var(--jade-border);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-checklist li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.feature-checklist li svg {
  color: var(--cinnabar);
  flex-shrink: 0;
}

/* ==========================================================================
   流媒体 & AI 支持专题玉石板
   ========================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-slab {
  padding: 42px;
  position: relative;
  overflow: hidden;
}

.showcase-slab::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--cinnabar) 0%, transparent 100%);
}

.showcase-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--cinnabar-subtle);
  border: 1px solid var(--cinnabar-border);
  color: var(--cinnabar);
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.showcase-title {
  font-size: 1.68rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.showcase-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 26px;
}

.tags-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.tag-brick {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  background: var(--bg-body);
  border: 1px solid var(--jade-border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.tag-brick .seal-point {
  width: 5px;
  height: 5px;
  background: var(--cinnabar);
  border-radius: 50%;
}

.showcase-highlight {
  background: var(--bg-slab-inset);
  border-left: 3px solid var(--cinnabar);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.68;
}

/* ==========================================================================
   套餐价格对比表 (参考网上优质专线机场真实套餐价格)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-slab {
  padding: 42px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.pricing-slab.featured {
  border: 2px solid var(--cinnabar);
  box-shadow: var(--slab-shadow-heavy), 0 0 35px var(--cinnabar-subtle);
  transform: scale(1.02);
  z-index: 2;
}

.pricing-slab.featured:hover {
  transform: scale(1.02) translateY(-4px);
}

/* 朱砂金印推荐冠标 */
.featured-seal-ribbon {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #d90429 0%, #b80322 100%);
  color: #fff;
  padding: 4px 18px;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 1px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 12px var(--cinnabar-glow);
  white-space: nowrap;
}

.plan-header {
  border-bottom: 1px solid var(--jade-border);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.price-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 20px 0 8px;
}

.price-symbol {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cinnabar);
}

.price-num {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-primary);
  font-family: "JetBrains Mono", sans-serif;
  letter-spacing: -1.5px;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.price-badge-sub {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--cinnabar);
  font-weight: 600;
  background: var(--cinnabar-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin-top: 4px;
}

.plan-features {
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.55;
}

.plan-features li svg {
  color: var(--cinnabar);
  flex-shrink: 0;
  margin-top: 3px;
}

.plan-features li strong {
  color: var(--text-primary);
}

.btn-pricing-cta {
  width: 100%;
}

/* ==========================================================================
   用户口碑 (坚决摒弃通用AI生成假头像，采用金石篆刻印章与东方名鉴)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-slab {
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-seal-stars {
  display: flex;
  gap: 5px;
  color: #d90429;
  margin-bottom: 18px;
}

.review-body {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.76;
  margin-bottom: 26px;
  flex-grow: 1;
}

.review-author-wrap {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--jade-border);
  padding-top: 18px;
}

/* 传统金石印章印记 (Traditional Intaglio Seal Monogram) */
.author-seal-mark {
  width: 44px;
  height: 44px;
  border-radius: 6px;
  border: 1.5px solid var(--cinnabar);
  background: var(--cinnabar-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Noto Serif SC", serif;
  font-size: 1.05rem;
  font-weight: 900;
  color: var(--cinnabar);
  box-shadow: inset 0 0 4px var(--cinnabar-subtle);
  flex-shrink: 0;
  letter-spacing: -1px;
}

.author-meta h4 {
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--text-primary);
}

.author-meta p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */
.faq-box {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 16px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 24px 28px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  background: none;
  border: none;
}

.faq-icon-cross {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  color: var(--text-muted);
}

.faq-item.active .faq-icon-cross {
  transform: rotate(45deg);
  color: var(--cinnabar);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
  padding: 0 28px;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.76;
}

.faq-item.active .faq-answer {
  max-height: 260px;
  padding: 0 28px 26px;
}

/* ==========================================================================
   底部转化横幅 (Bottom CTA)
   ========================================================================== */
.bottom-banner-slab {
  padding: 64px 44px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--cinnabar-border);
}

.bottom-banner-slab h2 {
  font-size: 2.3rem;
  font-weight: 900;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.bottom-banner-slab p {
  font-size: 1.12rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
}

/* ==========================================================================
   页脚 Footer（严格遵守：只保留四个标题，在新页面打开）
   ========================================================================== */
.site-footer {
  background: var(--bg-slab);
  border-top: 1px solid var(--jade-border);
  padding: 48px 0 36px;
  transition: background-color 0.35s ease;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 24px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
}

.footer-link:hover {
  color: var(--cinnabar);
  background: var(--cinnabar-subtle);
}

.footer-copyright {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ==========================================================================
   子页面通用板式（关于我们、服务条款、隐私政策、网站地图、推荐资讯）
   ========================================================================== */
.subpage-container {
  max-width: 880px;
  margin: 120px auto 80px;
  padding: 0 24px;
}

.subpage-card {
  padding: 52px;
}

.subpage-header {
  border-bottom: 1px solid var(--jade-border);
  padding-bottom: 26px;
  margin-bottom: 36px;
}

.subpage-title {
  font-size: 2.3rem;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.subpage-meta {
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 16px;
}

.subpage-content h2 {
  font-size: 1.48rem;
  font-weight: 800;
  margin: 36px 0 16px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.subpage-content h2::before {
  content: '';
  width: 4px;
  height: 22px;
  background: var(--cinnabar);
  border-radius: 2px;
  display: inline-block;
}

.subpage-content p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.82;
  margin-bottom: 18px;
}

.subpage-content ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 22px;
  color: var(--text-secondary);
}

.subpage-content ul li {
  margin-bottom: 10px;
  line-height: 1.74;
}

.subpage-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--cinnabar);
}

.subpage-back:hover {
  text-decoration: underline;
}

/* ==========================================================================
   深度SEO文章排版体系 (Table of Contents, FAQs, Callouts, Related Articles)
   ========================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--cinnabar);
}

.breadcrumb-sep {
  opacity: 0.5;
}

.toc-box {
  background: var(--bg-body);
  border: 1px solid var(--jade-border);
  border-left: 4px solid var(--cinnabar);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 32px 0 40px;
  box-shadow: var(--slab-shadow-sm);
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 0;
  list-style: none;
}

.toc-list li {
  font-size: 0.94rem;
  line-height: 1.6;
}

.toc-list a {
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.toc-list a:hover {
  color: var(--cinnabar);
  transform: translateX(4px);
}

.article-callout {
  background: var(--bg-slab-inset);
  border: 1px solid var(--jade-border);
  border-left: 4px solid var(--cinnabar);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 28px 0;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.76;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--jade-border);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.article-table th {
  background: var(--bg-body);
  padding: 14px 18px;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 2px solid var(--jade-border);
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--jade-border);
  color: var(--text-secondary);
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-author-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-body);
  border: 1px solid var(--jade-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 44px 0 32px;
}

/* 相关阅读网格 (Related Articles Grid) */
.related-section {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid var(--jade-border);
}

.related-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 24px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--bg-body);
  border: 1px solid var(--jade-border);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.related-card:hover {
  border-color: var(--cinnabar);
  transform: translateY(-2px);
  box-shadow: var(--slab-shadow-md);
}

.related-card h4 {
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
  line-height: 1.45;
}

.related-card:hover h4 {
  color: var(--cinnabar);
}

.related-card p {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
  flex-grow: 1;
}

.related-card-meta {
  font-size: 0.78rem;
  color: var(--cinnabar);
  font-weight: 600;
}

/* 资讯中心文章列表 (Article Hub Index) */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 36px;
}

.hub-card {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hub-card:hover {
  transform: translateY(-4px);
}

.hub-card-tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--cinnabar-subtle);
  color: var(--cinnabar);
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 4px;
  margin-bottom: 14px;
  width: fit-content;
}

.hub-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.45;
  color: var(--text-primary);
}

.hub-card:hover .hub-card-title {
  color: var(--cinnabar);
}

.hub-card-summary {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.hub-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--jade-border);
  padding-top: 16px;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.hub-read-link {
  color: var(--cinnabar);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

@media (max-width: 768px) {
  .related-grid, .hub-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}

/* ==========================================================================
   移动端响应式媒体查询 (@media)
   确保单栏完美呈现，指尖触控靶心 >= 48px
   ========================================================================== */
@media (max-width: 992px) {
  .hero-headline {
    font-size: 2.85rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  
  .showcase-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }
  
  .pricing-slab.featured {
    transform: none;
  }
  .pricing-slab.featured:hover {
    transform: translateY(-4px);
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  
  .telemetry-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  .telemetry-item:nth-child(2) {
    border-right: none;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 66px;
  }
  
  .brand-logo-img {
    height: 34px;
    max-width: 160px;
  }
  
  .section {
    padding: 64px 0;
  }
  
  .hero-section {
    padding: 124px 0 64px;
  }
  
  .hero-headline {
    font-size: 2.2rem;
    letter-spacing: -0.6px;
  }
  
  .hero-intro {
    font-size: 1.05rem;
    margin-bottom: 32px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .btn-seal-stamp, .btn-jade-plain {
    width: 100%;
    min-height: 48px; /* 移动端指尖靶心安全尺寸 */
    padding: 14px 20px;
  }
  
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-slab);
    border-bottom: 1px solid var(--jade-border);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    transform: translateY(-160%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
    box-shadow: var(--slab-shadow-heavy);
  }
  
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-toggle {
    display: flex;
  }
  
  .btn-nav-seal {
    display: none;
  }
  
  .showcase-slab {
    padding: 30px 22px;
  }
  
  .bottom-banner-slab {
    padding: 44px 22px;
  }
  
  .bottom-banner-slab h2 {
    font-size: 1.8rem;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  
  .subpage-card {
    padding: 30px 20px;
  }
  
  .subpage-title {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .telemetry-strip {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .telemetry-item {
    border-right: none;
    border-bottom: 1px solid var(--jade-border);
    padding-bottom: 12px;
  }
  
  .telemetry-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  
  .price-num {
    font-size: 2.6rem;
  }
}