/* ==========================================================================
   红杏云机场官网 - 官方主样式表 (完美修复版)
   核心风格：现代玫红色系 (Rose / Magenta) ＋ 红杏花精细装饰 ＋ 专业专线控制台
   主色调：玫红(#E11D48) / 深玫红(#BE123C) / 柔粉(#FFF1F2) / 炭墨黑(#0F172A)
   ========================================================================== */

:root {
  /* 现代玫红色系 */
  --color-primary: #E11D48;          /* 核心玫红 */
  --color-primary-hover: #BE123C;    /* 深玫红悬停 */
  --color-primary-light: #FFF1F2;    /* 柔粉玫红浅底 */
  --color-primary-soft: #FFE4E6;
  --color-rose-glow: rgba(225, 29, 72, 0.22);
  
  --color-emerald: #10B981;          /* 稳定在线绿灯 */
  --color-emerald-bg: #ECFDF5;
  --color-amber: #F59E0B;            /* 警示与注意 */

  --color-dark: #0F172A;             /* 深邃炭黑背景与文本 */
  --color-slate-dark: #1E293B;
  --color-slate-main: #334155;
  --color-slate-muted: #64748B;
  
  --bg-page: #FAFAF9;                /* 清爽优雅纸白底色 */
  --bg-card: #FFFFFF;
  --border-color: #E2E8F0;
  --border-subtle: #F1F5F9;

  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;

  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 25px rgba(225, 29, 72, 0.08);
  --shadow-lg: 0 20px 45px rgba(15, 23, 42, 0.08);
  --shadow-rose: 0 12px 28px rgba(225, 29, 72, 0.25);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, monospace;

  --container-max: 1220px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 全局重置与背景修复 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: #FAFAF9;
  color: var(--color-dark);
  line-height: 1.75;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 92% 0%, rgba(254, 226, 226, 0.55) 0%, transparent 650px),
    radial-gradient(circle at 8% 28%, rgba(255, 241, 242, 0.45) 0%, transparent 550px),
    radial-gradient(#E2E8F0 1.2px, transparent 1.2px);
  background-size: 100% auto, 100% auto, 28px 28px;
  background-position: top right, top left, top center;
  background-repeat: no-repeat, no-repeat, repeat;
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-size: 0.9375rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #E11D48 0%, #BE123C 100%);
  color: #FFFFFF;
  border-color: #E11D48;
  box-shadow: var(--shadow-rose);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #F43F5E 0%, #E11D48 100%);
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(225, 29, 72, 0.35);
}

.btn-outline {
  background: #FFFFFF;
  color: var(--color-dark);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
  transform: translateY(-2px);
}

/* 徽章 */
.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
}

.badge-tag.rose {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-soft);
}

.badge-tag.emerald {
  background: var(--color-emerald-bg);
  color: var(--color-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

/* ==========================================================================
   导航系统 (完美居中、不换行、全兼容)
   ========================================================================== */
/* ==========================================================================
   导航系统 (统一高雅视觉与全响应式适配)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  width: 100%;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  width: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-flower-icon {
  width: 38px;
  height: 38px;
  min-width: 38px;
  border-radius: 10px;
  display: block;
  object-fit: contain;
  box-shadow: 0 4px 12px rgba(225, 29, 72, 0.2);
}

.logo-window-emblem {
  width: 38px;
  height: 38px;
  min-width: 38px;
  border-radius: 10px;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(225, 29, 72, 0.2);
}

.brand-text-group,
.brand-name-group {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.brand-name,
.brand-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.2;
  white-space: nowrap;
}

.brand-badge-sub,
.brand-subtitle {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  margin: 0 16px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-slate-muted);
  position: relative;
  padding: 6px 0;
  white-space: nowrap;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition);
  transform: translateX(-50%);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-dark);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-xs);
  transition: var(--transition);
}

.menu-toggle:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* ==========================================================================
   红杏花艺术背景装饰与 HERO 专区
   ========================================================================== */
.hero-vpn-section {
  padding: 60px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero-apricot-canvas {
  position: absolute;
  top: -25px;
  right: -15px;
  width: 480px;
  max-width: 38vw;
  pointer-events: none;
  z-index: 1;
  opacity: 0.92;
  filter: drop-shadow(0 14px 28px rgba(225, 29, 72, 0.12));
}

.hero-apricot-branch {
  width: 100%;
  height: auto;
  display: block;
}

.subpage-apricot-decor {
  position: absolute;
  top: -15px;
  right: -10px;
  width: 320px;
  max-width: 30vw;
  pointer-events: none;
  opacity: 0.7;
  z-index: 1;
  filter: drop-shadow(0 8px 20px rgba(225, 29, 72, 0.08));
}

.hero-vpn-grid {
  position: relative;
  z-index: 2;

  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 44px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-notice-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
}

.pulse-dot-rose {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-soft);
  animation: pulse-rose 2s infinite;
}

@keyframes pulse-rose {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.5; }
}

.notice-pill-text {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary-hover);
}

.hero-vpn-title {
  font-size: 2.85rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-dark);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-vpn-title .highlight-rose {
  background: linear-gradient(135deg, #E11D48 0%, #FB7185 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-vpn-desc {
  font-size: 1.05rem;
  color: var(--color-slate-main);
  line-height: 1.8;
  margin-bottom: 30px;
}

.hero-vpn-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 34px;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow-sm);
}

.vpn-highlight-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-dark);
}

.vpn-highlight-item svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.hero-sla-note {
  font-size: 0.8125rem;
  color: var(--color-slate-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 专线控制台与测速仪表盘 */
.speed-console-card {
  background: var(--color-dark);
  border: 1px solid #334155;
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.4);
  color: #F8FAFC;
  position: relative;
  overflow: hidden;
  z-index: 2;
}

.speed-console-card::before {
  content: "";
  position: absolute;
  top: -50px;
  right: -50px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(225, 29, 72, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.console-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #334155;
  padding-bottom: 16px;
  margin-bottom: 18px;
}

.console-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: #F8FAFC;
}

.console-status-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: rgba(16, 185, 129, 0.15);
  color: #34D399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-weight: 700;
}

.console-node-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.console-node-item {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid #334155;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: var(--transition);
}

.console-node-item:hover,
.console-node-item.active {
  border-color: var(--color-primary);
  background: rgba(225, 29, 72, 0.12);
  transform: translateX(4px);
}

.node-item-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-dot-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-emerald);
}

.node-name-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: #F8FAFC;
}

.node-rate-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: rgba(225, 29, 72, 0.2);
  color: #FB7185;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
}

.node-item-ping {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: #34D399;
}

.console-dashboard-bottom {
  background: #090E17;
  border: 1px solid #1E293B;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dashboard-stat-row {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.stat-label-text {
  color: #94A3B8;
  font-size: 0.75rem;
}
.stat-val-text {
  color: #F8FAFC;
  font-weight: 700;
  font-size: 0.875rem;
}
.stat-val-text.rose {
  color: #FB7185;
}

.btn-run-speedtest {
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
  padding: 8px 16px;
  font-size: 0.8125rem;
  font-weight: 700;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-run-speedtest:hover {
  background: #F43F5E;
}

/* ==========================================================================
   套餐价格导视板块
   ========================================================================== */
.pricing-section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 50px;
}

.section-subtag {
  font-size: 0.8125rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--color-dark);
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.section-intro {
  font-size: 1.05rem;
  color: var(--color-slate-muted);
  line-height: 1.8;
}

.pricing-switcher-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-bottom: 44px;
}

.pricing-switch-box {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  padding: 4px;
  border-radius: var(--radius-pill);
  display: inline-flex;
  box-shadow: var(--shadow-sm);
}

.switch-btn {
  padding: 8px 22px;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  border: none;
  background: transparent;
  color: var(--color-slate-muted);
  cursor: pointer;
  transition: var(--transition);
}

.switch-btn.active {
  background: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(225, 29, 72, 0.25);
}

.discount-rose-pill {
  font-size: 0.75rem;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-weight: 800;
  border: 1px solid var(--color-primary-soft);
}

.pricing-card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.pricing-plan-card {
  background: #FFFFFF;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.pricing-plan-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.pricing-plan-card.featured {
  border: 2px solid var(--color-primary);
  box-shadow: 0 16px 40px rgba(225, 29, 72, 0.12);
  transform: translateY(-4px);
}

.featured-top-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #E11D48 0%, #BE123C 100%);
  color: #FFFFFF;
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 3px 14px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
}

.plan-head-section {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 20px;
  margin-bottom: 22px;
}

.plan-name-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.plan-summary-desc {
  font-size: 0.8125rem;
  color: var(--color-slate-muted);
  min-height: 38px;
  line-height: 1.6;
}

.plan-price-group {
  display: flex;
  align-items: baseline;
  margin: 16px 0 8px;
}

.plan-currency-symbol {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
}

.plan-price-amount {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--color-dark);
  font-family: var(--font-mono);
  line-height: 1;
}

.plan-period-label {
  font-size: 0.8125rem;
  color: var(--color-slate-muted);
  margin-left: 6px;
  font-weight: 600;
}

.plan-traffic-pill {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 800;
  color: var(--color-dark);
  background: var(--bg-page);
  padding: 6px 12px;
  border-radius: var(--radius-xs);
  display: inline-block;
  border: 1px solid var(--border-color);
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 22px 0 28px;
  flex-grow: 1;
}

.plan-feature-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--color-dark);
}

.plan-feature-row svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.pricing-notice-banner {
  margin-top: 40px;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--color-slate-muted);
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   核心优势
   ========================================================================== */
.features-section {
  padding: 80px 0;
  background: #FFFFFF;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-vpn-card {
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  transition: var(--transition);
}

.feature-vpn-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.feature-icon-box {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 20px;
  transition: var(--transition);
}

.feature-vpn-card:hover .feature-icon-box {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
}

.feature-vpn-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.feature-vpn-body {
  font-size: 0.9rem;
  color: var(--color-slate-muted);
  line-height: 1.7;
}

/* ==========================================================================
   适用人群画像
   ========================================================================== */
.audience-section {
  padding: 80px 0;
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.audience-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.audience-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.audience-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.audience-card-title svg {
  color: var(--color-primary);
}

.audience-card-text {
  font-size: 0.875rem;
  color: var(--color-slate-muted);
  line-height: 1.7;
}

/* ==========================================================================
   CLASH 与 CLASH PARTY 教程
   ========================================================================== */
.tutorial-section {
  padding: 80px 0;
  background: #FFFFFF;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.tutorial-tabs-wrapper {
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.tutorial-nav {
  display: flex;
  background: #F1F5F9;
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: 16px 20px;
  border: none;
  background: transparent;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-slate-muted);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.tab-btn.active {
  background: var(--bg-page);
  color: var(--color-primary);
  box-shadow: inset 0 3px 0 var(--color-primary);
}

.tutorial-tab-content {
  padding: 38px 30px;
}

.step-flow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.step-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px 20px;
  box-shadow: var(--shadow-sm);
}

.step-index-dot {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 800;
  font-size: 0.875rem;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.step-text {
  font-size: 0.875rem;
  color: var(--color-slate-muted);
  line-height: 1.7;
}

/* ==========================================================================
   手风琴 FAQ 知识库
   ========================================================================== */
.faq-section {
  padding: 90px 0;
}

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

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.faq-item.active {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.faq-question-btn {
  width: 100%;
  padding: 18px 22px;
  text-align: left;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-title-text {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-dark);
  transition: var(--transition);
}

.faq-item.active .faq-title-text {
  color: var(--color-primary);
}

.faq-icon-arrow {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-slate-muted);
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.faq-answer-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  background: #FCFAF9;
}

.faq-answer-inner {
  padding: 0 22px 22px;
  font-size: 0.9375rem;
  color: var(--color-slate-muted);
  line-height: 1.8;
  border-top: 1px dashed var(--border-color);
  padding-top: 14px;
}

/* ==========================================================================
   技术专栏文章卡片
   ========================================================================== */
.articles-preview-section {
  padding: 80px 0;
  background: #FFFFFF;
  border-top: 1px solid var(--border-color);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.article-meta-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.article-heading {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.45;
  margin-bottom: 10px;
}

.article-excerpt {
  font-size: 0.875rem;
  color: var(--color-slate-muted);
  line-height: 1.7;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed var(--border-color);
  padding-top: 12px;
  font-size: 0.75rem;
  color: var(--color-slate-muted);
}

/* ==========================================================================
   文章详情页排版
   ========================================================================== */
.article-page-body {
  padding: 40px 0 80px;
}

.breadcrumb-nav {
  margin-bottom: 24px;
  font-size: 0.875rem;
  color: var(--color-slate-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

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

.article-layout-grid {
  display: grid;
  grid-template-columns: 1fr 310px;
  gap: 36px;
}

.article-main-content {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 42px 38px;
  box-shadow: var(--shadow-sm);
}

.article-hero-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 20px;
  margin-bottom: 30px;
}

.article-hero-h1 {
  font-size: 2.2rem;
  line-height: 1.35;
  color: var(--color-dark);
  margin-bottom: 14px;
  font-weight: 900;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.8125rem;
  color: var(--color-slate-muted);
  font-family: var(--font-mono);
  flex-wrap: wrap;
}

.article-rich-text {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-dark);
}

.article-rich-text h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--color-dark);
  margin: 36px 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-subtle);
  position: relative;
}

.article-rich-text h2::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 44px;
  height: 2px;
  background: var(--color-primary);
}

.article-rich-text h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-dark);
  margin: 26px 0 10px;
}

.article-rich-text p {
  margin-bottom: 18px;
}

.article-rich-text ul,
.article-rich-text ol {
  margin: 0 0 20px 22px;
  line-height: 1.85;
}

.article-rich-text li {
  margin-bottom: 6px;
}

.article-rich-text blockquote {
  margin: 24px 0;
  padding: 16px 20px;
  background: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  font-size: 0.95rem;
  color: var(--color-dark);
}

.article-rich-text table {
  width: 100%;
  border-collapse: collapse;
  margin: 26px 0;
  font-size: 0.875rem;
  background: #FFFFFF;
}

.article-rich-text th,
.article-rich-text td {
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  text-align: left;
}

.article-rich-text th {
  background: #F8FAFC;
  font-weight: 700;
  color: var(--color-dark);
}

.article-rich-text code {
  font-family: var(--font-mono);
  background: var(--color-primary-light);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  font-size: 0.85em;
  color: var(--color-primary-hover);
}

.article-rich-text pre {
  background: var(--color-dark);
  color: #E2E8F0;
  padding: 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 20px 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 22px;
  box-shadow: var(--shadow-sm);
}

.widget-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.85rem;
}

.sidebar-toc-list a {
  color: var(--color-slate-muted);
}
.sidebar-toc-list a:hover {
  color: var(--color-primary);
}

.sidebar-rec-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.rec-item-link {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.rec-item-link:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   通用页脚 Footer
   ========================================================================== */
.site-footer {
  background: #F1F5F9;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 28px;
  margin-top: 70px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 16px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.875rem;
}

.footer-links-list a {
  color: var(--color-slate-muted);
}

.footer-links-list a:hover {
  color: var(--color-primary);
}

.footer-bottom-bar {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--color-slate-muted);
  flex-wrap: wrap;
  gap: 14px;
}

/* 响应式适配 */
/* 响应式适配 */
@media (max-width: 1024px) {
  .hero-vpn-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid,
  .articles-grid,
  .audience-grid,
  .step-flow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-layout-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 960px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 20px 24px;
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.1);
    gap: 16px;
    margin: 0;
    z-index: 999;
  }
  .main-nav.mobile-open {
    display: flex;
  }
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .hero-vpn-title {
    font-size: 2.15rem;
  }
  .hero-apricot-canvas {
    width: 200px;
    max-width: 45vw;
    top: -10px;
    right: -10px;
    opacity: 0.38;
  }
  .subpage-apricot-decor {
    width: 150px;
    max-width: 40vw;
    opacity: 0.35;
  }
  .pricing-card-grid,
  .features-grid,
  .articles-grid,
  .audience-grid,
  .step-flow-grid {
    grid-template-columns: 1fr;
  }
  .tutorial-nav {
    flex-direction: column;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .article-main-content {
    padding: 24px 18px;
  }
}