/* ===================================================================
   魔戒机场 (The One Ring Cloud) - 瑞士理性主义几何排版设计系统
   Swiss-Rationalist Geometric Typographic UI
   纯黑白高反差 | 1px极细发丝线 | 几何光环呼吸 | 瞬时光学反转
   =================================================================== */

:root {
  /* 基础黑白理性主义调色板 */
  --bg-page: #ffffff;
  --bg-subtle: #fbfbfb;
  --bg-inverted: #000000;
  --bg-nav: rgba(255, 255, 255, 0.92);

  --text-main: #000000;
  --text-secondary: #555555;
  --text-muted: #888888;
  --text-inverted: #ffffff;

  --hairline: #e5e5e5;
  --hairline-dark: #000000;
  --hairline-ring: rgba(0, 0, 0, 0.08);

  --accent-dot: #000000;
  --accent-green: #0a8f4c;

  --font-grotesk: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;

  --nav-height: 70px;
  --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- 深邃纯粹黑夜模式 (Dark Mode) --- */
[data-theme="dark"] {
  --bg-page: #050505;
  --bg-subtle: #0d0d0d;
  --bg-inverted: #ffffff;
  --bg-nav: rgba(5, 5, 5, 0.92);

  --text-main: #ffffff;
  --text-secondary: #aaaaaa;
  --text-muted: #666666;
  --text-inverted: #000000;

  --hairline: #1f1f1f;
  --hairline-dark: #ffffff;
  --hairline-ring: rgba(255, 255, 255, 0.12);

  --accent-dot: #ffffff;
  --accent-green: #10b981;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 20px);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-grotesk);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  letter-spacing: -0.01em;
  transition: background-color 0.2s ease, color 0.2s ease;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* --- 瑞士几何背景光环 (The Balanced 1px Hairline Ring) --- */
.hero-geometric-ring {
  position: absolute;
  top: 180px;
  left: 50%;
  transform: translateX(-50%);
  width: 720px;
  height: 720px;
  border: 1px solid var(--hairline-ring);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  animation: ring-breathe 8s ease-in-out infinite alternate;
}

.hero-geometric-ring::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 460px;
  height: 460px;
  border: 1px dashed var(--hairline-ring);
  border-radius: 50%;
}

@keyframes ring-breathe {
  0% {
    transform: translateX(-50%) scale(0.96);
    opacity: 0.7;
  }
  100% {
    transform: translateX(-50%) scale(1.04);
    opacity: 1;
  }
}

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

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

ul, ol {
  list-style: none;
}

/* --- 布局容器 --- */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

.container-narrow {
  max-width: 880px;
}

/* --- 顶部固定导航栏 (Header & Nav) --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  height: var(--nav-height);
  background-color: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hairline);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 20px;
}

/* 品牌标识 */
.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-ring {
  width: 24px;
  height: 24px;
  border: 2px solid var(--text-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.brand-ring::after {
  content: "";
  width: 6px;
  height: 6px;
  background-color: var(--text-main);
  border-radius: 50%;
}

/* 金色发光魔戒 Logo 视觉样式 */
.brand-logo-img {
  width: 26px;
  height: 26px;
  object-fit: contain;
  display: block;
  border-radius: 50%;
  filter: drop-shadow(0 0 6px rgba(255, 179, 0, 0.65));
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.25s ease;
}

.site-brand:hover .brand-logo-img {
  transform: scale(1.14) rotate(15deg);
  filter: drop-shadow(0 0 12px rgba(255, 165, 0, 0.95));
}

.brand-text {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 2px 6px;
  border: 1px solid var(--hairline);
  color: var(--text-secondary);
  text-transform: uppercase;
}

/* 完整导航链接目录 (包含首页、各板块、推荐资讯) */
.header-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-item {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 0;
  white-space: nowrap;
}

.nav-item:hover {
  color: var(--text-main);
}

.nav-item::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--text-main);
  transition: width 0.2s ease;
}

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

.nav-item-highlight {
  font-weight: 700;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-item-highlight::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-green);
}

/* 右侧控制区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 精致专业化透明昼夜模式切换按钮 */
.theme-switch-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--hairline);
  background: transparent;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 50%;
  transition: border-color 0.2s, background-color 0.2s;
  position: relative;
}

.theme-switch-btn:hover {
  border-color: var(--text-main);
  background-color: var(--bg-subtle);
}

.theme-switch-btn svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 白天图标与夜晚图标显示逻辑 */
.theme-icon-sun {
  display: block;
}
.theme-icon-moon {
  display: none;
}

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

/* --- 按钮规范 (严苛功能主义) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 12px 24px;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  border-radius: 0; /* 纯粹包豪斯/瑞士理性主义平角 */
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: var(--font-grotesk);
}

.btn-primary {
  background-color: var(--bg-inverted);
  color: var(--text-inverted) !important;
  border: 1px solid var(--bg-inverted);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--text-main) !important;
  border-color: var(--text-main);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--hairline-dark);
}

.btn-outline:hover {
  background-color: var(--bg-inverted);
  color: var(--text-inverted);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.82rem;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1rem;
  min-height: 50px;
}

/* --- 主视觉 Hero 区域 --- */
.hero-block {
  padding: 90px 0 70px;
  position: relative;
  text-align: center;
  border-bottom: 1px solid var(--hairline);
}

.hero-meta-kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 24px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.hero-meta-kicker::before,
.hero-meta-kicker::after {
  content: "";
  width: 24px;
  height: 1px;
  background-color: var(--hairline-dark);
}

.hero-h1 {
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--text-main);
  margin-bottom: 24px;
  text-transform: none;
}

.hero-h1 span.en-sub {
  display: block;
  font-size: clamp(1.1rem, 2.4vw, 1.6rem);
  font-weight: 400;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-top: 10px;
  text-transform: uppercase;
}

.hero-intro {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* 瑞士理性主义指标数据格栅 (Typographic Metrics Grid) */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--hairline);
  margin-top: 50px;
}

.metric-cell {
  padding: 24px 16px;
  text-align: left;
  border-right: 1px solid var(--hairline);
  font-family: var(--font-mono);
}

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

.metric-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.metric-val {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

/* --- 通用章节骨架 --- */
.content-section {
  padding: 90px 0;
  border-bottom: 1px solid var(--hairline);
  position: relative;
}

.section-lead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 48px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--hairline-dark);
  flex-wrap: wrap;
  gap: 16px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.section-heading {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 480px;
}

/* --- 产品核心优势 (3个图文模块 · 0ms 光学反转微交互) --- */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--hairline);
}

.advantage-unit {
  padding: 40px 32px;
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: var(--bg-page);
  /* 0ms 瞬时光学反转 */
  transition: background-color 0s, color 0s;
}

.advantage-unit:last-child {
  border-right: none;
}

.advantage-unit:hover {
  background-color: var(--bg-inverted);
  color: var(--text-inverted);
}

.advantage-unit:hover .unit-tag,
.advantage-unit:hover .unit-desc,
.advantage-unit:hover .unit-spec {
  color: var(--text-inverted);
  opacity: 0.9;
}

.advantage-unit:hover .spec-line {
  border-color: rgba(255, 255, 255, 0.2);
}

.unit-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.unit-title {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.unit-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 32px;
}

.unit-spec {
  border-top: 1px solid var(--hairline);
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.spec-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.spec-line:last-child {
  margin-bottom: 0;
}

/* --- 流媒体 & AI 支持模块 (平面化结构网格) --- */
.matrix-container {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.matrix-group {
  border: 1px solid var(--hairline);
}

.matrix-group-header {
  padding: 20px 24px;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.matrix-group-title {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 12px;
}

.matrix-indicator {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-green);
  text-transform: uppercase;
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.matrix-cell {
  padding: 24px;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background-color: var(--bg-page);
  transition: background-color 0s, color 0s;
}

.matrix-cell:hover {
  background-color: var(--bg-inverted);
  color: var(--text-inverted);
}

.matrix-cell:hover .matrix-spec,
.matrix-cell:hover .matrix-desc {
  color: var(--text-inverted);
  opacity: 0.85;
}

.matrix-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.matrix-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  border: 1px solid currentColor;
  padding: 2px 6px;
}

.matrix-spec {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.matrix-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.matrix-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

/* --- 清晰套餐价格对比表 (魔戒真实网上套餐架构) --- */
/* 魔戒机场特点：主打按量永不过期 (Perpetual Bandwidth) */
.pricing-matrix {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--hairline-dark);
}

.pricing-column {
  padding: 40px 28px;
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  background-color: var(--bg-page);
  position: relative;
  transition: background-color 0.15s ease;
}

.pricing-column:last-child {
  border-right: none;
}

.pricing-column.featured {
  background-color: var(--bg-subtle);
  border-left: 2px solid var(--hairline-dark);
  border-right: 2px solid var(--hairline-dark);
}

.pricing-header-box {
  margin-bottom: 24px;
}

.plan-flag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 2px 8px;
  background-color: var(--bg-inverted);
  color: var(--text-inverted);
  display: inline-block;
  margin-bottom: 12px;
}

.pricing-plan-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.pricing-plan-subtitle {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.pricing-rate {
  margin: 20px 0 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--hairline);
}

.rate-currency {
  font-size: 1.2rem;
  font-weight: 700;
  vertical-align: super;
}

.rate-figure {
  font-size: 3.2rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1;
  letter-spacing: -0.04em;
}

.rate-terms {
  display: block;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--accent-green);
  font-weight: 600;
  margin-top: 6px;
}

.pricing-spec-list {
  margin-bottom: 36px;
  flex-grow: 1;
}

.spec-entry {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 10px 0;
  border-bottom: 1px dashed var(--hairline);
}

.spec-entry:last-child {
  border-bottom: none;
}

.spec-entry-dot {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-main);
  font-weight: 700;
}

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

/* --- 用户评价 (Typographic Quotes) --- */
.reviews-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--hairline);
}

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

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

.review-score {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  letter-spacing: 0.1em;
}

.review-body {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--text-main);
  margin-bottom: 24px;
}

.review-author {
  border-top: 1px solid var(--hairline);
  padding-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.author-role {
  color: var(--text-secondary);
}

/* --- 常见问题 FAQ (纯原生折叠) --- */
.faq-architectural {
  border-top: 1px solid var(--hairline-dark);
}

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

.faq-row summary {
  padding: 24px 0;
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  user-select: none;
}

.faq-row summary::-webkit-details-marker {
  display: none;
}

.faq-symbol {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 400;
  transition: transform 0.2s ease;
}

.faq-row[open] .faq-symbol {
  transform: rotate(45deg);
}

.faq-details {
  padding-bottom: 24px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 900px;
}

/* --- 底部极简行动呼吁 (Call to Action) --- */
.cta-slate {
  background-color: var(--bg-inverted);
  color: var(--text-inverted);
  padding: 70px 48px;
  text-align: center;
  margin: 60px 0;
  border: 1px solid var(--hairline-dark);
}

.cta-slate h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: var(--text-inverted);
}

.cta-slate p {
  font-size: 1.1rem;
  color: var(--text-inverted);
  opacity: 0.85;
  max-width: 680px;
  margin: 0 auto 36px;
}

.btn-white {
  background-color: var(--text-inverted);
  color: var(--bg-inverted) !important;
  border: 1px solid var(--text-inverted);
}

.btn-white:hover {
  background-color: transparent;
  color: var(--text-inverted) !important;
}

/* --- 页脚规范 (Footer) --- */
/* 用户需求：页脚只保留这四个标题，内容打开新的页面展示 */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 50px 0 40px;
  background-color: var(--bg-page);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.footer-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 6px 0;
  position: relative;
}

.footer-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 1px;
  background-color: var(--text-main);
  transition: width 0.2s ease;
}

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

.footer-colophon {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--hairline);
  padding-top: 24px;
}

/* --- 子页面公共版式 (关于我们、服务条款、隐私政策、网站地图、推荐资讯) --- */
.subpage-container {
  padding: 70px 0 100px;
}

.subpage-header {
  border-bottom: 1px solid var(--hairline-dark);
  padding-bottom: 36px;
  margin-bottom: 48px;
}

.subpage-h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.subpage-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.editorial-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.editorial-section {
  margin-bottom: 50px;
}

.editorial-section h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--hairline);
  letter-spacing: -0.02em;
}

.editorial-section h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 24px 0 12px;
}

.editorial-section p {
  margin-bottom: 18px;
}

.editorial-section ul {
  padding-left: 24px;
  list-style: square;
  margin-bottom: 24px;
}

.editorial-section li {
  margin-bottom: 10px;
}

.banner-notice {
  border: 1px solid var(--hairline-dark);
  padding: 24px;
  margin: 28px 0;
  background-color: var(--bg-subtle);
  color: var(--text-main);
}

.banner-notice strong {
  color: var(--text-main);
}

/* 推荐资讯卡片流 */
.news-feed {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--hairline-dark);
}

.news-article {
  padding: 36px 0;
  border-bottom: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
}

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

.news-content h3 {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.news-content p {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
}

.news-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.news-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  border: 1px solid var(--hairline);
  padding: 2px 8px;
  color: var(--text-secondary);
}

/* --- 响应式适配媒体查询 (@media) --- */
@media (max-width: 1024px) {
  .pricing-matrix {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-column {
    border-bottom: 1px solid var(--hairline);
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .advantage-unit {
    border-right: none;
    border-bottom: 1px solid var(--hairline);
  }
  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .metric-cell:nth-child(2) {
    border-right: none;
  }
  .metric-cell {
    border-bottom: 1px solid var(--hairline);
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
    padding: 12px 0;
  }
  
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
  }

  /* 移动端水平平滑滑动导航栏 */
  .header-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding: 8px 0;
    gap: 18px;
    -webkit-overflow-scrolling: touch;
    border-top: 1px solid var(--hairline);
  }

  .nav-item {
    font-size: 0.85rem;
    padding: 4px 0;
  }

  /* 几何光环适配移动屏 */
  .hero-geometric-ring {
    width: 320px;
    height: 320px;
    top: 120px;
  }

  .hero-geometric-ring::after {
    width: 200px;
    height: 200px;
  }

  .hero-block {
    padding: 60px 0 40px;
  }

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

  .hero-cta-wrap .btn {
    width: 100%;
  }

  .metrics-row {
    grid-template-columns: 1fr;
  }

  .metric-cell {
    border-right: none;
  }

  .pricing-matrix {
    grid-template-columns: 1fr;
  }

  .pricing-column {
    border-right: none;
  }

  .reviews-row {
    grid-template-columns: 1fr;
  }

  .review-item {
    border-right: none;
    border-bottom: 1px solid var(--hairline);
  }

  .cta-slate {
    padding: 48px 24px;
  }

  .footer-nav {
    gap: 20px 24px;
    justify-content: center;
  }

  .news-article {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

/* --- 深度 SEO 长文专用排版规范 (Article Layout & Typographic Elements) --- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

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

.breadcrumb a:hover {
  color: var(--text-main);
  text-decoration: underline;
}

.article-header {
  border-bottom: 1px solid var(--hairline-dark);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

.article-h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--text-main);
}

.article-meta-bar {
  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-bar span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 文章目录 (Table of Contents) */
.article-toc {
  border: 1px solid var(--hairline);
  background-color: var(--bg-subtle);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.toc-title {
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.toc-list {
  padding-left: 20px;
  list-style: decimal;
  font-size: 0.92rem;
  line-height: 1.8;
}

.toc-list li a {
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

.toc-list li a:hover {
  color: var(--text-main);
  text-decoration: underline;
}

/* 瑞士建筑感表格 (Architectural Table) */
.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--hairline);
}

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

.article-table th,
.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--hairline);
  border-right: 1px solid var(--hairline);
}

.article-table th:last-child,
.article-table td:last-child {
  border-right: none;
}

.article-table th {
  background-color: var(--bg-subtle);
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  color: var(--text-main);
}

.article-table tr:hover td {
  background-color: var(--bg-subtle);
}

/* 代码与配置展示块 */
.code-box {
  background-color: var(--bg-subtle);
  border: 1px solid var(--hairline);
  padding: 18px;
  margin: 24px 0;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--text-main);
}

/* 相关阅读网格 (Related Reading) */
.related-box {
  border-top: 1px solid var(--hairline-dark);
  padding-top: 40px;
  margin-top: 60px;
}

.related-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

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

.related-card:hover {
  border-color: var(--hairline-dark);
  background-color: var(--bg-subtle);
}

.related-card-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.related-card-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-main);
}

.related-card-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-main);
  text-decoration: underline;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}