/* ==========================================================================
   白嫖机场 (BaiPiao Cloud) - Mono Free｜黑白自由 核心视觉样式表
   设计风格：黑白强对比、大字排版、高科技极客极简、极致转化率导向
   ========================================================================== */

/* 1. 变量与设计令牌 (Design Tokens) */
:root {
  --bg-primary: #080808;
  --bg-secondary: #111111;
  --bg-tertiary: #181818;
  --bg-card: #121212;
  --bg-card-hover: #1a1a1a;
  
  --border-light: rgba(255, 255, 255, 0.12);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-active: #ffffff;
  
  --text-primary: #ffffff;
  --text-secondary: #a3a3a3;
  --text-muted: #666666;
  --text-inverse: #000000;
  
  --color-white: #ffffff;
  --color-black: #000000;
  --color-accent-glow: rgba(255, 255, 255, 0.15);
  --color-badge-green: #10b981;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --container-max: 1200px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 2. 基础重置与规范 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
  list-style: none;
}

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

/* 3. 布局容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.text-center {
  text-align: center;
}

.desktop-only {
  display: block;
}

@media (max-width: 768px) {
  .desktop-only {
    display: none;
  }
}

/* 4. 按钮系统 (Buttons) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-white);
  color: var(--color-black);
  border: 1px solid var(--color-white);
}

.btn-primary:hover {
  background-color: #e5e5e5;
  border-color: #e5e5e5;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 255, 255, 0.2);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  color: var(--color-white);
  border-color: var(--border-light);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-md {
  padding: 12px 24px;
  font-size: 0.95rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

.btn-xl {
  padding: 16px 36px;
  font-size: 1.1rem;
  font-weight: 700;
}

.btn-block {
  width: 100%;
}

.btn-glow {
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.25);
}

.btn-hero-glow {
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.35);
}

.btn-hero-glow:hover {
  box-shadow: 0 0 45px rgba(255, 255, 255, 0.55);
}

/* 5. 顶部紧急转化公告条 */
.top-announcement {
  background-color: #000000;
  border-bottom: 1px solid var(--border-subtle);
  padding: 10px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.announcement-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  text-align: center;
}

.pulse-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background-color: #1a1a1a;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.announcement-inner strong {
  color: #ffffff;
}

.announcement-link {
  color: #ffffff;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.announcement-link:hover {
  opacity: 0.8;
}

/* 6. 站点导航 Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(8, 8, 8, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-symbol {
  width: 42px;
  height: 42px;
  background-color: var(--color-white);
  color: var(--color-black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: -0.05em;
  border-radius: var(--radius-sm);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--color-white);
  line-height: 1.2;
}

.logo-sub {
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link.active {
  color: var(--color-white);
  font-weight: 700;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  border-radius: var(--radius-full);
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  padding: 8px;
}

.hamburger-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  transition: transform var(--transition-fast);
}

/* 移动端抽屉 */
.mobile-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  background-color: #0a0a0a;
  border-bottom: 1px solid var(--border-light);
  padding: 24px 20px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
}

.mobile-drawer.active {
  display: block;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.04);
}

.mobile-nav-link.active {
  color: #ffffff;
  font-weight: 700;
  background-color: rgba(255, 255, 255, 0.08);
  border-left: 3px solid #ffffff;
}

.mobile-cta-wrap {
  margin-top: 16px;
}

/* 7. Hero 区域 (Mono Free 黑白自由大字排版) */
.section-hero {
  position: relative;
  padding: 90px 0 70px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-bg-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 30%, rgba(0,0,0,0) 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 30%, rgba(0,0,0,0) 80%);
  pointer-events: none;
}

.hero-container {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 960px;
}

.hero-badge-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.dot-live {
  width: 8px;
  height: 8px;
  background-color: var(--color-badge-green);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-badge-green);
  animation: pulse-live 2s infinite;
}

@keyframes pulse-live {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.title-sub {
  font-size: 1.15rem;
  letter-spacing: 0.35em;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.title-main {
  font-size: clamp(2.8rem, 7vw, 5.2rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--color-white);
}

.text-stroke {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--color-white);
  text-stroke: 1.5px var(--color-white);
  transition: all var(--transition-fast);
}

.text-stroke:hover {
  color: var(--color-white);
}

.hero-lead {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 800px;
  margin: 0 auto 36px;
}

.hero-lead strong {
  color: var(--color-white);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 54px;
}

.icon-arrow {
  transition: transform var(--transition-fast);
}

.btn:hover .icon-arrow {
  transform: translateX(4px);
}

/* 8. 实时数据与指标卡 (Metrics) */
.hero-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.metric-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: left;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.metric-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 255, 255, 0.4);
}

.metric-card.highlight {
  background: linear-gradient(145deg, #181818, #0f0f0f);
  border-color: var(--color-white);
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.08);
}

.metric-value {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-white);
  margin-bottom: 6px;
}

.metric-unit {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-left: 2px;
}

.metric-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.metric-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* 平台微章 */
.hero-platforms {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px dashed var(--border-subtle);
}

.platforms-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.platforms-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.plat-tag {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  background-color: #171717;
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* 9. 通用 Section 头部 */
.section-header {
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  letter-spacing: 0.2em;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 3px 10px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.02);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--color-white);
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* 10. 核心特性 (Features) */
.section-features {
  padding: 90px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 60px;
}

.feature-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.feature-box:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.4);
  background-color: var(--bg-card-hover);
}

.feature-box.highlight-border {
  border: 1.5px solid var(--color-white);
  box-shadow: 0 8px 30px rgba(255, 255, 255, 0.06);
}

.feature-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-white);
  margin-bottom: 14px;
}

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

.feature-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background-color: #000000;
  color: #d4d4d4;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* 对比表格 (Comparison Table) */
.comparison-wrapper {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
}

.comparison-heading {
  margin-bottom: 24px;
}

.comparison-heading h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.comparison-heading p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

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

.mono-table th, .mono-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.mono-table th {
  font-weight: 700;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mono-table .th-highlight {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.05);
  border-top-left-radius: var(--radius-sm);
  border-top-right-radius: var(--radius-sm);
}

.mono-table .td-highlight {
  background-color: rgba(255, 255, 255, 0.03);
  font-weight: 600;
}

.badge-status-green {
  display: inline-block;
  color: var(--color-white);
  background-color: #1a1a1a;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

/* 11. 套餐价格展示 (Plans) */
.section-plans {
  padding: 90px 0;
  border-bottom: 1px solid var(--border-subtle);
  background-color: #0b0b0b;
}

.pricing-tabs-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 44px;
}

.pricing-tabs {
  display: inline-flex;
  background-color: #171717;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  padding: 4px;
  gap: 4px;
}

.tab-btn {
  padding: 10px 24px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.tab-btn.active {
  background-color: var(--color-white);
  color: var(--color-black);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 44px;
}

.plan-card {
  position: relative;
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.plan-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
}

.plan-card.plan-featured {
  background: linear-gradient(180deg, #1c1c1c 0%, #121212 100%);
  border: 2px solid var(--color-white);
  box-shadow: 0 12px 40px rgba(255, 255, 255, 0.1);
  transform: scale(1.02);
}

.plan-card.plan-featured:hover {
  transform: scale(1.03) translateY(-5px);
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-white);
  color: var(--color-black);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  box-shadow: 0 4px 15px rgba(255, 255, 255, 0.3);
}

.plan-badge-type {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.plan-name {
  font-size: 1.85rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin-bottom: 6px;
}

.plan-summary {
  font-size: 0.88rem;
  color: var(--text-secondary);
  min-height: 40px;
  margin-bottom: 20px;
}

.plan-price-block {
  border-top: 1px dashed var(--border-subtle);
  border-bottom: 1px dashed var(--border-subtle);
  padding: 20px 0;
  margin-bottom: 20px;
}

.price-main {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-white);
}

.amount {
  font-size: 3.2rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--color-white);
}

.period {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.price-alt {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

.price-alt strong {
  color: var(--color-white);
}

.plan-traffic-highlight {
  background-color: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 24px;
}

.traffic-num {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: -0.02em;
}

.traffic-unit {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.traffic-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.badge-accent {
  display: inline-block;
  background-color: #262626;
  color: #ffffff;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
}

.plan-features {
  margin-bottom: 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.check-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: #a3a3a3;
  margin-top: 2px;
}

.check-icon.text-white {
  color: #ffffff;
}

.plan-action {
  margin-top: auto;
}

/* 长期订阅计费补充表 */
.pricing-extra-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
}

.extra-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 10px;
}

.extra-box-header h4 {
  font-size: 1.15rem;
  font-weight: 800;
}

.badge-discount {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background-color: var(--color-white);
  color: var(--color-black);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 800;
}

.extra-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.extra-item {
  background-color: #0c0c0c;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.extra-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-white);
}

.extra-vals {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.extra-vals strong {
  color: var(--color-white);
}

.pricing-notice {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* 12. 节点与协议 (Nodes) */
.section-nodes {
  padding: 90px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.nodes-status-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 44px;
}

.node-status-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-fast);
}

.node-status-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 255, 255, 0.4);
}

.node-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.node-location {
  display: flex;
  align-items: center;
  gap: 8px;
}

.flag {
  font-size: 1.35rem;
}

.city {
  font-size: 0.98rem;
  font-weight: 700;
}

.latency-pill {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background-color: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.node-routes {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.route-tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  background-color: #1a1a1a;
  color: #a3a3a3;
  padding: 2px 8px;
  border-radius: 4px;
}

.node-usage {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.protocols-banner {
  background: linear-gradient(135deg, #171717 0%, #0d0d0d 100%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.protocols-left h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.protocols-left p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 580px;
}

.protocols-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.p-tag {
  background-color: #000000;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 95px;
}

.p-tag strong {
  font-size: 0.85rem;
  color: var(--color-white);
}

.p-tag span {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* 13. 客户端与教程 (Tutorial) */
.section-tutorial {
  padding: 90px 0;
  border-bottom: 1px solid var(--border-subtle);
  background-color: #090909;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 50px;
}

.step-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  display: flex;
  flex-direction: column;
}

.step-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--color-white);
  background-color: #222222;
  border: 1px solid var(--border-light);
  display: inline-block;
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.step-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.step-link {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-white);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.step-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.os-clients-wrapper {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
}

.os-clients-header {
  margin-bottom: 28px;
}

.os-clients-header h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.os-clients-header p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.os-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.os-item {
  background-color: #0d0d0d;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
}

.os-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.os-icon {
  font-size: 1.8rem;
}

.os-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--color-white);
}

.os-compat {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: block;
}

.os-app-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.os-app-list strong {
  color: #e5e5e5;
}

/* 14. 常见问题 (FAQ) */
.section-faq {
  padding: 90px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.faq-accordion-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: rgba(255, 255, 255, 0.4);
  background-color: #141414;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-white);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition-normal);
  color: var(--text-secondary);
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
  color: var(--color-white);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px dashed var(--border-subtle);
  padding-top: 16px;
}

.faq-answer ul {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.faq-answer strong {
  color: var(--color-white);
}

/* 15. 底部大号召唤区 (Final CTA) */
.section-final-cta {
  padding: 100px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.final-cta-card {
  position: relative;
  background: linear-gradient(135deg, #181818 0%, #0d0d0d 100%);
  border: 2px solid var(--color-white);
  border-radius: var(--radius-lg);
  padding: 64px 40px;
  text-align: center;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8), 0 0 50px rgba(255, 255, 255, 0.08);
}

.final-cta-glow {
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(255, 255, 255, 0.15) 0%, rgba(0, 0, 0, 0) 70%);
  pointer-events: none;
}

.final-cta-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
  margin: 0 auto;
}

.final-title {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--color-white);
  margin: 16px 0;
}

.final-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
}

.final-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.final-guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* 16. 页脚 Footer */
.site-footer {
  background-color: #050505;
  padding: 70px 0 30px;
}

.footer-container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-logo {
  margin-bottom: 4px;
}

.footer-tagline {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

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

.footer-domain strong {
  color: var(--color-white);
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-menu {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.footer-menu a:hover {
  color: var(--color-white);
}

.footer-keywords span {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-channel-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.footer-channel-desc code {
  background-color: #171717;
  padding: 2px 6px;
  border-radius: 4px;
  color: #ffffff;
  font-family: var(--font-mono);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.footer-disclaimer {
  max-width: 600px;
}

/* 17. 移动端悬浮底部粘性转化栏 (Sticky Bar) */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: rgba(10, 10, 10, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-light);
  padding: 10px 16px;
  z-index: 99;
  box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.7);
}

.sticky-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 500px;
  margin: 0 auto;
}

.sticky-info {
  display: flex;
  flex-direction: column;
}

.sticky-title {
  font-size: 0.88rem;
  font-weight: 800;
  color: #ffffff;
}

.sticky-price {
  font-size: 0.75rem;
  color: #a3a3a3;
}

/* 18. Toast 气泡提醒 */
.toast-notification {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(30px);
  background-color: #ffffff;
  color: #000000;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 700;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 999;
}

.toast-notification.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* 19. 极致响应式适配 (Responsive Media Queries) */
@media (max-width: 1024px) {
  .hero-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .plans-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .nodes-status-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .os-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .extra-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-container {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-desktop, .header-actions {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .mobile-sticky-bar {
    display: block;
  }
  
  .section-hero {
    padding: 50px 0 40px;
  }
  
  .title-main {
    font-size: 2.5rem;
  }
  
  .title-sub {
    font-size: 0.85rem;
    letter-spacing: 0.2em;
  }
  
  .hero-metrics-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  
  .metric-card {
    padding: 14px 12px;
  }
  
  .metric-value {
    font-size: 1.5rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .plans-grid {
    grid-template-columns: 1fr;
  }
  
  .plan-card.plan-featured {
    transform: none;
  }
  
  .plan-card.plan-featured:hover {
    transform: translateY(-4px);
  }
  
  .nodes-status-grid {
    grid-template-columns: 1fr;
  }
  
  .protocols-banner {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .protocols-tags {
    justify-content: flex-start;
    width: 100%;
  }
  
  .steps-grid {
    grid-template-columns: 1fr;
  }
  
  .os-grid {
    grid-template-columns: 1fr;
  }
  
  .final-cta-card {
    padding: 40px 20px;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
  
  body {
    padding-bottom: 70px; /* 避免移动端底部粘性条遮挡内容 */
  }
}


/* ==========================================================================
   20. 独立页面组件样式 (Multi-Page Specific Styles)
   Mono Free 黑白风格延续：大字排版、高对比度、清晰层级、极客极简
   ========================================================================== */

/* 面包屑导航 */
.breadcrumbs-nav {
  padding: 18px 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumbs-list a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumbs-list a:hover {
  color: var(--color-white);
}

.breadcrumbs-separator {
  color: var(--border-light);
}

.breadcrumbs-current {
  color: var(--color-white);
  font-weight: 600;
}

/* 独立页面专用头部 Page Hero */
.page-hero {
  padding: 60px 0 45px;
  border-bottom: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, rgba(0, 0, 0, 0) 100%);
  position: relative;
}

.page-hero-title {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--color-white);
  margin-bottom: 16px;
}

.page-hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 780px;
  line-height: 1.7;
}

.page-content-section {
  padding: 70px 0;
  border-bottom: 1px solid var(--border-subtle);
}

/* 呼出提示框 Callout */
.callout-box {
  background-color: #121212;
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--color-white);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 28px 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.callout-box strong {
  color: var(--color-white);
}

/* 教程步骤块 Tutorial Steps */
.tutorial-step-block {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 28px;
  transition: border-color var(--transition-fast);
}

.tutorial-step-block:hover {
  border-color: rgba(255, 255, 255, 0.35);
}

.step-num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-white);
  color: var(--color-black);
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 0.85rem;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.step-heading {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 12px;
}

.step-description {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 18px;
}

/* 代码或配置展示框 */
.code-snippet {
  background-color: #050505;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #e5e5e5;
  overflow-x: auto;
  margin: 14px 0;
}

/* 教程入口网格 */
.tutorials-hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 50px;
}

.tutorial-hub-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.tutorial-hub-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.4);
  background-color: var(--bg-card-hover);
}

.hub-card-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.hub-card-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 10px;
}

.hub-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 22px;
  flex-grow: 1;
}

.hub-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-white);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* 场景与建议卡片 Grid */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 36px 0;
}

.scenario-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 26px;
}

.scenario-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background-color: #222222;
  color: #d4d4d4;
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 12px;
}

.scenario-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-white);
}

.scenario-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* 跨页面内部链接导航块 */
.internal-nav-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px;
  margin-top: 50px;
}

.internal-nav-header {
  margin-bottom: 24px;
}

.internal-nav-header h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 6px;
}

.internal-nav-header p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.internal-links-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.internal-link-card {
  background-color: #0c0c0c;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: all var(--transition-fast);
}

.internal-link-card:hover {
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
}

.internal-link-card strong {
  font-size: 0.95rem;
  color: var(--color-white);
}

.internal-link-card span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

@media (max-width: 900px) {
  .tutorials-hub-grid {
    grid-template-columns: 1fr;
  }
  .scenario-grid {
    grid-template-columns: 1fr;
  }
  .internal-links-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .internal-links-row {
    grid-template-columns: 1fr;
  }
  .tutorial-step-block {
    padding: 24px 18px;
  }
}