/* ===================================================================
   MESL — Monolithic Typographic Architecture
   Aesthetic: Monumental Swiss-Brutalist Editorial Design
   Palette:
     - Obsidian Charcoal (#0C0D10)
     - Stark Bone White (#F3F3F1)
     - Faint Champagne Gold Edge Accents (#E5C07B)
   Zero app/vector icons — Pure typography, geometric spatial depth, editorial hairlines
   =================================================================== */

:root {
  /* 白天模式 (默认)：骨白纸质底色 + 黑曜石炭黑字 + 极细香槟金线 */
  --bg-primary: #F3F3F1;
  --bg-surface: #EAEAE6;
  --bg-card: #FFFFFF;
  --bg-card-contrast: #0C0D10;
  --bg-nav: rgba(243, 243, 241, 0.92);
  --bg-translucent: rgba(12, 13, 16, 0.04);
  --bg-translucent-hover: rgba(12, 13, 16, 0.08);

  --text-primary: #0C0D10;
  --text-secondary: #4A4D54;
  --text-muted: #7E828B;
  --text-inverse: #F3F3F1;

  --accent-gold: #C5A059;
  --accent-gold-faint: rgba(197, 160, 89, 0.22);
  --accent-gold-glow: rgba(197, 160, 89, 0.35);

  --border-hairline: rgba(12, 13, 16, 0.12);
  --border-strong: #0C0D10;
  --border-gold: #C5A059;

  --monolith-bg: #E3E3DE;
  --monolith-side: #C8C8C1;
  --monolith-shadow: rgba(12, 13, 16, 0.15);

  --matrix-bg: #0C0D10;
  --matrix-text: #E5C07B;
  --matrix-faint: rgba(229, 192, 123, 0.2);

  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  --font-editorial: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-monumental: "Helvetica Neue", -apple-system, Arial Black, Impact, sans-serif;

  --transition-theme: background-color 0.4s cubic-bezier(0.16, 1, 0.3, 1),
                      color 0.4s cubic-bezier(0.16, 1, 0.3, 1),
                      border-color 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  /* 夜间模式：黑曜石炭黑底色 + 极地骨白高亮字 + 幽微香槟金光边缘 */
  --bg-primary: #0C0D10;
  --bg-surface: #14161C;
  --bg-card: #12141A;
  --bg-card-contrast: #F3F3F1;
  --bg-nav: rgba(12, 13, 16, 0.92);
  --bg-translucent: rgba(243, 243, 241, 0.06);
  --bg-translucent-hover: rgba(243, 243, 241, 0.12);

  --text-primary: #F3F3F1;
  --text-secondary: #A6AAB5;
  --text-muted: #626773;
  --text-inverse: #0C0D10;

  --accent-gold: #E5C07B;
  --accent-gold-faint: rgba(229, 192, 123, 0.2);
  --accent-gold-glow: rgba(229, 192, 123, 0.45);

  --border-hairline: rgba(243, 243, 241, 0.1);
  --border-strong: rgba(243, 243, 241, 0.85);
  --border-gold: #E5C07B;

  --monolith-bg: #1B1E26;
  --monolith-side: #0F1116;
  --monolith-shadow: rgba(0, 0, 0, 0.85);

  --matrix-bg: #07080A;
  --matrix-text: #E5C07B;
  --matrix-faint: rgba(229, 192, 123, 0.15);
}

/* ===================================================================
   基础排版与瑞士粗野主义风格网格
   =================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-editorial);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  letter-spacing: -0.015em;
  transition: var(--transition-theme);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 瑞士版面结构微线网格 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(to right, var(--border-hairline) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border-hairline) 1px, transparent 1px);
  background-size: 120px 120px;
  pointer-events: none;
  opacity: 0.35;
  z-index: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-gold);
}

.container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 1;
}

.container-narrow {
  max-width: 920px;
}

/* ===================================================================
   页眉 Header 瑞士版面导航
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-hairline);
  z-index: 1000;
  transition: var(--transition-theme);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-anchor {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.04em;
  font-size: 1.45rem;
}

.brand-glyph {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-gold);
  border: 1px solid var(--border-gold);
  padding: 2px 6px;
  border-radius: 2px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link .nav-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link.active-link {
  color: var(--text-primary);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gold);
  transition: width 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 昼夜切换按钮：高质感透明、香槟金细线边框、专业平滑 */
.theme-toggle-btn {
  background: var(--bg-translucent);
  border: 1px solid var(--border-hairline);
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0;
}

.theme-toggle-btn:hover {
  border-color: var(--accent-gold);
  background: var(--bg-translucent-hover);
  box-shadow: 0 0 12px var(--accent-gold-faint);
}

.theme-toggle-btn .state-text {
  transition: transform 0.3s ease, opacity 0.3s ease;
  letter-spacing: 0.06em;
}

[data-theme="light"] .theme-toggle-btn .state-dark {
  display: none;
}
[data-theme="light"] .theme-toggle-btn .state-light {
  display: inline-block;
  color: var(--accent-gold);
}

[data-theme="dark"] .theme-toggle-btn .state-light {
  display: none;
}
[data-theme="dark"] .theme-toggle-btn .state-dark {
  display: inline-block;
  color: var(--accent-gold);
}

/* 瑞士粗野主义按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border-radius: 2px;
  font-family: var(--font-editorial);
  white-space: nowrap;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

.btn-primary:hover {
  background: var(--accent-gold);
  color: #0C0D10;
  border-color: var(--accent-gold);
  box-shadow: 0 0 20px var(--accent-gold-glow);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-hairline);
}

.btn-secondary:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  background: var(--bg-translucent);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1rem;
}

.mobile-toggle-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-hairline);
  color: var(--text-primary);
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  cursor: pointer;
}

/* ===================================================================
   HERO 区域：3D 巨石字体雕塑 (MESL MONOLITHIC SCULPTURE)
   =================================================================== */
.hero-editorial {
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
  perspective: 1200px;
}

.hero-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
  padding: 12px 0;
  margin-bottom: 40px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.hero-meta-left {
  display: flex;
  align-items: center;
  gap: 18px;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-gold);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px var(--accent-gold);
  animation: pulseGold 2s infinite;
}

@keyframes pulseGold {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

/* 巨石 3D 字母容器 (M-E-S-L) */
.monolith-viewport {
  width: 100%;
  height: 380px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 20px 0 50px;
  transform-style: preserve-3d;
  cursor: crosshair;
}

/* 底部矩阵窥探图层 (Real-time Latency Matrix) */
.matrix-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--matrix-bg);
  border: 1px solid var(--border-gold);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  opacity: 0.88;
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.8);
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1;
}

.matrix-header {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--matrix-text);
  border-bottom: 1px solid var(--matrix-faint);
  padding-bottom: 8px;
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--matrix-text);
  padding: 16px 0;
}

.matrix-node {
  background: rgba(229, 192, 123, 0.05);
  border: 1px solid var(--matrix-faint);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.matrix-node-code {
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.95rem;
}

.matrix-node-ping {
  color: var(--accent-gold);
}

.matrix-footer {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--matrix-text);
  opacity: 0.7;
  display: flex;
  justify-content: space-between;
}

/* 3D 巨石字母雕塑 M-E-S-L */
.monolith-letters-track {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  z-index: 3;
  transform-style: preserve-3d;
  pointer-events: none; /* 让鼠标穿透或捕获 */
}

.monolith-glyph {
  font-family: var(--font-monumental);
  font-size: 16rem;
  font-weight: 900;
  line-height: 0.8;
  letter-spacing: -0.06em;
  color: var(--monolith-bg);
  text-shadow: 
    1px 1px 0px var(--monolith-side),
    2px 2px 0px var(--monolith-side),
    3px 3px 0px var(--monolith-side),
    4px 4px 0px var(--monolith-side),
    5px 5px 0px var(--monolith-side),
    6px 6px 0px var(--monolith-side),
    7px 7px 0px var(--monolith-side),
    8px 8px 0px var(--monolith-side),
    9px 9px 0px var(--monolith-side),
    10px 10px 0px var(--monolith-side),
    12px 14px 28px var(--monolith-shadow),
    0 0 20px var(--accent-gold-faint);
  position: relative;
  transition: transform 0.15s ease-out;
  transform-style: preserve-3d;
  user-select: none;
  filter: drop-shadow(0 0 1px var(--border-gold));
}

/* 悬停光圈光栅扩展动画 (Mask Layer Peeking) */
.monolith-viewport:hover .matrix-backdrop {
  opacity: 1;
  transform: scale(1.02);
  box-shadow: 0 0 50px var(--accent-gold-faint), inset 0 0 40px rgba(0, 0, 0, 0.9);
}

.monolith-viewport:hover .monolith-glyph {
  filter: drop-shadow(0 0 3px var(--accent-gold));
}

/* 标题与简介结构 */
.hero-content {
  text-align: center;
  max-width: 980px;
  margin: 0 auto;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero-title .brand-callout {
  color: var(--accent-gold);
  border-bottom: 2px solid var(--accent-gold);
  display: inline-block;
  padding-bottom: 2px;
}

.hero-intro {
  font-size: 1.25rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-cta-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 60px;
}

/* 巨石级参数指标条 */
.hero-specs-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
  padding: 28px 0;
}

.spec-cell {
  padding: 0 24px;
  border-right: 1px solid var(--border-hairline);
  text-align: left;
}

.spec-cell:last-child {
  border-right: none;
}

.spec-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-gold);
  margin-bottom: 6px;
}

.spec-value {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: var(--font-monumental);
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
}

.spec-label {
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===================================================================
   通用章节标题 (Editorial Section Header)
   =================================================================== */
.section {
  padding: 100px 0;
  position: relative;
  border-bottom: 1px solid var(--border-hairline);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 50px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--text-primary);
}

.section-head-left {
  max-width: 780px;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--accent-gold);
  margin-bottom: 12px;
  display: block;
}

.section-heading {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.section-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-top: 10px;
}

.section-index-num {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--border-hairline);
  line-height: 1;
}

/* ===================================================================
   产品核心优势：3个图文卡片 (Monumental Editorial Cards)
   =================================================================== */
.features-monolith-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-monolith-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  padding: 40px 32px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.feature-monolith-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-gold);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.08);
}

.card-bracket {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-gold);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.feature-visual-monument {
  height: 140px;
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.monument-crosshair {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  position: absolute;
  top: 8px;
  left: 8px;
}

.monument-diagram-text {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  text-align: center;
}

.monument-diagram-sub {
  font-size: 0.72rem;
  color: var(--accent-gold);
  letter-spacing: 0.15em;
  margin-top: 4px;
}

.feature-card-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.feature-card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-specs-list {
  list-style: none;
  border-top: 1px solid var(--border-hairline);
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.feature-specs-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 10px;
  color: var(--text-secondary);
}

.feature-specs-list li::before {
  content: "+";
  color: var(--accent-gold);
  font-weight: 700;
}

/* ===================================================================
   流媒体图卡 & AI 支持图卡
   =================================================================== */
.showcase-monolith-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-monolith-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  padding: 44px 38px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.showcase-monolith-card:hover {
  border-color: var(--accent-gold);
  box-shadow: 0 0 30px var(--accent-gold-faint);
}

.showcase-top-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.showcase-title-block {
  margin-bottom: 20px;
}

.showcase-main-title {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.showcase-sub-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-gold);
}

.showcase-body-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 30px;
}

/* 纯版面排印应用矩阵 (Zero icons, Pure typography) */
.editorial-app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.editorial-app-cell {
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color 0.2s;
}

.editorial-app-cell:hover {
  border-color: var(--accent-gold);
}

.app-code {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
}

.app-status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-gold);
}

.showcase-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-hairline);
  padding-top: 24px;
}

/* ===================================================================
   套餐价格对比表：参考网上真实 MESL 机场定价
   =================================================================== */
.pricing-monolith-table {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.pricing-column {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  padding: 40px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.pricing-column:hover {
  transform: translateY(-6px);
  border-color: var(--accent-gold);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
}

.pricing-column.featured {
  background: var(--bg-card);
  border: 2px solid var(--accent-gold);
  box-shadow: 0 0 35px var(--accent-gold-faint);
  transform: scale(1.02);
  z-index: 2;
}

.pricing-column.featured:hover {
  transform: scale(1.04) translateY(-4px);
}

.column-flag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-gold);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.plan-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.plan-summary {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 44px;
  line-height: 1.5;
  margin-bottom: 24px;
}

.price-monolith-display {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-hairline);
}

.price-symbol {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
}

.price-digits {
  font-family: var(--font-monumental);
  font-size: 3.4rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
}

.price-period {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.plan-details-list {
  list-style: none;
  font-size: 0.88rem;
  margin-bottom: 36px;
  flex-grow: 1;
}

.plan-details-list li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-secondary);
}

.plan-details-list li:last-child {
  border-bottom: none;
}

.plan-details-list li strong {
  color: var(--text-primary);
  font-family: var(--font-mono);
}

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

/* ===================================================================
   用户真实评价 (Reviews)
   =================================================================== */
.reviews-editorial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.review-editorial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-quote-mark {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  color: var(--accent-gold);
  line-height: 1;
  margin-bottom: 14px;
}

.review-quote-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
  font-style: normal;
}

.review-sign-off {
  border-top: 1px solid var(--border-hairline);
  padding-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.reviewer-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.reviewer-title {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ===================================================================
   常见问题解答 (FAQ)
   =================================================================== */
.faq-monolith-container {
  max-width: 900px;
  margin: 0 auto;
}

.faq-monolith-item {
  border-bottom: 1px solid var(--border-hairline);
  transition: border-color 0.2s;
}

.faq-monolith-item:first-child {
  border-top: 1px solid var(--border-hairline);
}

.faq-monolith-trigger {
  width: 100%;
  background: transparent;
  border: none;
  padding: 24px 8px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-editorial);
  transition: color 0.2s ease;
}

.faq-monolith-trigger:hover {
  color: var(--accent-gold);
}

.faq-num-prefix {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-gold);
  margin-right: 12px;
}

.faq-toggle-sign {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

.faq-monolith-item.active .faq-toggle-sign {
  transform: rotate(45deg);
  color: var(--accent-gold);
}

.faq-monolith-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 0 8px 0 42px;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-monolith-item.active .faq-monolith-content {
  max-height: 400px;
  padding-bottom: 28px;
}

/* ===================================================================
   页脚 Footer：严格只保留四个标题，在新页面打开
   =================================================================== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-hairline);
  padding: 70px 0 50px;
  transition: var(--transition-theme);
}

.footer-four-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.footer-four-link {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  position: relative;
  padding: 6px 4px;
}

.footer-four-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gold);
  transition: width 0.25s ease;
}

.footer-four-link:hover {
  color: var(--accent-gold);
}

.footer-four-link:hover::after {
  width: 100%;
}

.footer-colophon {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-hairline);
  padding-top: 28px;
}

/* ===================================================================
   推荐资讯页面专用排版 (news-insights-8k.html)
   =================================================================== */
.insights-feed-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin: 40px 0 60px;
}

.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.25s, transform 0.25s;
}

.insight-card:hover {
  border-color: var(--accent-gold);
  transform: translateY(-3px);
}

.insight-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-gold);
  margin-bottom: 14px;
}

.insight-title {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
}

.insight-excerpt {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.insight-footer {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 子页面通用结构 */
.subpage-container {
  padding: 60px 0 100px;
}

.subpage-header {
  border-bottom: 2px solid var(--text-primary);
  padding-bottom: 30px;
  margin-bottom: 50px;
}

.subpage-title {
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.subpage-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 760px;
}

.editorial-article-block {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  padding: 44px 40px;
  margin-bottom: 36px;
}

.editorial-article-block h2 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.editorial-article-block h2::before {
  content: "//";
  color: var(--accent-gold);
  font-family: var(--font-mono);
  font-size: 1.2rem;
}

.editorial-article-block p {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.editorial-article-block p:last-child {
  margin-bottom: 0;
}

.editorial-article-block ul, .editorial-article-block ol {
  padding-left: 24px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 18px;
}

.editorial-article-block li {
  margin-bottom: 8px;
}

/* ===================================================================
   响应式媒体查询 (@media)：移动端单栏完美显示，点击热区优化
   =================================================================== */
@media (max-width: 1100px) {
  .hero-title {
    font-size: 2.6rem;
  }
  .monolith-glyph {
    font-size: 11rem;
  }
  .monolith-viewport {
    height: 300px;
  }
  .pricing-monolith-table {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-column.featured {
    transform: none;
  }
}

@media (max-width: 860px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-hairline);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.2);
  }

  .nav-menu.show {
    display: flex;
  }

  .mobile-toggle-btn {
    display: block;
  }

  .hero-meta-bar {
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-intro {
    font-size: 1.05rem;
  }

  .monolith-glyph {
    font-size: 7rem;
  }

  .monolith-viewport {
    height: 220px;
  }

  .matrix-grid {
    grid-template-columns: repeat(2, 1fr);
    font-size: 0.72rem;
  }

  .hero-specs-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .spec-cell {
    border-right: none;
    padding: 0;
  }

  .features-monolith-grid,
  .showcase-monolith-grid,
  .reviews-editorial-grid,
  .insights-feed-grid {
    grid-template-columns: 1fr;
  }

  .pricing-monolith-table {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 20px auto 0;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .hero-cta-bar {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-bar .btn {
    width: 100%;
    min-height: 48px;
  }

  .footer-four-nav {
    flex-direction: column;
    gap: 20px;
  }

  .footer-four-link {
    width: 100%;
    text-align: center;
    border: 1px solid var(--border-hairline);
    padding: 12px;
/* ===================================================================
   深度科普 SEO 文章专用样式 (Long-form SEO Articles)
   =================================================================== */
.article-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--text-primary);
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

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

.article-breadcrumb a:hover {
  color: var(--accent-gold);
}

.article-headline {
  font-size: 2.6rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 18px;
  color: var(--text-primary);
}

.article-meta-info {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-info span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 文章目录 (Table of Contents) */
.article-toc {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-left: 4px solid var(--accent-gold);
  padding: 24px 28px;
  margin: 32px 0 44px;
  border-radius: 2px;
}

.article-toc-title {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.article-toc-list a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  transition: color 0.2s ease, transform 0.2s ease;
}

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

.article-toc-list .toc-index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-gold);
}

/* 文章正文排版 */
.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-content h2 {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin: 48px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-hairline);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.article-content h2 .h2-prefix {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent-gold);
}

.article-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 32px 0 14px;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content strong {
  color: var(--text-primary);
  font-weight: 700;
}

.article-content ul, .article-content ol {
  margin: 16px 0 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-content li {
  line-height: 1.75;
}

/* 强调与引用方块 */
.editorial-callout {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-left: 4px solid var(--text-primary);
  padding: 20px 24px;
  margin: 28px 0;
  font-size: 0.98rem;
  color: var(--text-primary);
}

.editorial-callout.gold {
  border-left-color: var(--accent-gold);
  background: rgba(229, 192, 123, 0.05);
}

.editorial-callout-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-gold);
  margin-bottom: 8px;
  text-transform: uppercase;
}

/* 技术对比表格 */
.editorial-table-wrapper {
  overflow-x: auto;
  margin: 28px 0;
}

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

.editorial-table th {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 12px 16px;
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 700;
}

.editorial-table td {
  border: 1px solid var(--border-hairline);
  padding: 12px 16px;
  color: var(--text-secondary);
}

.editorial-table tr:hover td {
  background: var(--bg-translucent);
}

/* 代码段排版 */
.editorial-code-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 2px;
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-primary);
  overflow-x: auto;
  margin: 20px 0;
}

/* 文章专属 CTA 转化卡片 */
.article-cta-box {
  background: var(--bg-card);
  border: 2px solid var(--accent-gold);
  padding: 36px 32px;
  margin: 50px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  box-shadow: 0 0 25px var(--accent-gold-faint);
  flex-wrap: wrap;
}

.article-cta-text h3 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.article-cta-text p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* FAQ 模块 (Article FAQ) */
.article-faq-section {
  margin: 56px 0 40px;
  padding-top: 36px;
  border-top: 2px solid var(--text-primary);
}

.article-faq-header {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 24px;
}

.article-faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  padding: 22px 24px;
  margin-bottom: 14px;
}

.article-faq-q {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.article-faq-a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* 相关阅读模块 (Related Reading) */
.article-related-section {
  margin: 50px 0 20px;
  padding-top: 36px;
  border-top: 1px solid var(--border-hairline);
}

.article-related-title {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-gold);
  margin-bottom: 20px;
  text-transform: uppercase;
}

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

.article-related-card {
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.2s, transform 0.2s;
}

.article-related-card:hover {
  border-color: var(--accent-gold);
  transform: translateY(-2px);
}

.article-related-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.45;
}

.article-related-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.article-related-card span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-gold);
  font-weight: 700;
}

@media (max-width: 860px) {
  .article-headline {
    font-size: 1.95rem;
  }
  .article-related-grid {
    grid-template-columns: 1fr;
  }
  .article-cta-box {
    flex-direction: column;
    align-items: flex-start;
  }
}

  .hero-title {
    font-size: 1.7rem;
  }
  .monolith-glyph {
    font-size: 4.8rem;
  }
  .monolith-letters-track {
    padding: 0 10px;
  }
  .monolith-viewport {
    height: 180px;
  }
  .editorial-app-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-specs-strip {
    grid-template-columns: 1fr;
  }
}