/* ==========================================================================
   星辰VPN (XingChen VPN) - SaaS Pricing & Landing Page UI Style
   Aesthetic: Crisp Cool-White SaaS, Cyan-to-Violet Gradient Typography & Soft Floating Cards
   Palette:
     - Soft frost off-white background: #F8FAFC
     - Pure white elevated cards: #FFFFFF
     - Vibrant cyan accent: #00B8FF
     - Cyan-to-violet gradient: linear-gradient(135deg, #00B8FF 0%, #7C5CFF 100%)
     - Muted slate text: #64748B
     - Deep charcoal headings: #0F172A
     - Emerald chat widget: #0D7A5F
   Strict Constraints: Clean minimalist UI line icons only. NO AI sparkles/stars.
   ========================================================================== */

:root {
  /* 白天模式调色板 (默认) */
  --bg-primary: #F8FAFC;
  --bg-secondary: #FFFFFF;
  --bg-tertiary: #F1F5F9;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FFFFFF;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --border-color: #E2E8F0;
  --border-subtle: #EDF2F7;
  --border-focus: #00B8FF;

  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-muted: #64748B;
  --text-invert: #FFFFFF;

  /* 核心强调色与渐变 */
  --accent-cyan: #00B8FF;
  --accent-cyan-hover: #009FE0;
  --accent-violet: #7C5CFF;
  --accent-gradient: linear-gradient(135deg, #00B8FF 0%, #7C5CFF 100%);
  --accent-subtle: rgba(0, 184, 255, 0.08);
  --accent-subtle-violet: rgba(124, 92, 255, 0.08);

  --chat-emerald: #0D7A5F;
  --chat-emerald-hover: #0B6851;
  --accent-emerald: #10B981;
  --accent-amber: #F59E0B;

  /* 阴影层次 */
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.02);
  --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 16px 36px -4px rgba(15, 23, 42, 0.08), 0 6px 14px -2px rgba(15, 23, 42, 0.03);
  --shadow-card: 0 12px 30px -4px rgba(15, 23, 42, 0.05);
  --shadow-cyan-glow: 0 6px 20px rgba(0, 184, 255, 0.35);
  --shadow-cyan-glow-lg: 0 10px 28px rgba(0, 184, 255, 0.45);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --header-height: 72px;
  --max-width: 1220px;
  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 黑夜模式调色板 */
[data-theme="dark"] {
  --bg-primary: #090D16;
  --bg-secondary: #0F1523;
  --bg-tertiary: #161F33;
  --bg-card: #121A2B;
  --bg-card-hover: #172136;
  --bg-glass: rgba(11, 16, 28, 0.88);
  --border-color: rgba(255, 255, 255, 0.09);
  --border-subtle: rgba(255, 255, 255, 0.05);
  --border-focus: #00B8FF;

  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --text-invert: #0F172A;

  --accent-cyan: #00B8FF;
  --accent-cyan-hover: #38BDF8;
  --accent-violet: #9078FF;
  --accent-gradient: linear-gradient(135deg, #00B8FF 0%, #9078FF 100%);
  --accent-subtle: rgba(0, 184, 255, 0.14);
  --accent-subtle-violet: rgba(124, 92, 255, 0.14);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 6px 18px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 40px -4px rgba(0, 0, 0, 0.65);
  --shadow-card: 0 14px 34px -4px rgba(0, 0, 0, 0.55);
  --shadow-cyan-glow: 0 6px 22px rgba(0, 184, 255, 0.3);
  --shadow-cyan-glow-lg: 0 10px 32px rgba(0, 184, 255, 0.4);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
}

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

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

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

/* 顶部细微光感 */
.top-ambient-glow {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 480px;
  background: radial-gradient(ellipse at 50% 0%, rgba(0, 184, 255, 0.12) 0%, rgba(124, 92, 255, 0.06) 50%, transparent 80%);
  pointer-events: none;
  z-index: 0;
}

/* ==========================================================================
   Sticky Top Navbar (Clean White Glass Header)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
}

/* 品牌 Logo (Blue cloud-orbit icon + bold 星辰VPN) */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  cursor: pointer;
}

.brand-logo-img {
  height: 38px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: transform var(--transition-fast);
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.03);
}

/* 昼夜模式自适应切换官方高清 Logo */
html:not([data-theme="dark"]) .logo-dark-mode {
  display: none !important;
}
html:not([data-theme="dark"]) .logo-light-mode {
  display: block !important;
}

[data-theme="dark"] .logo-light-mode {
  display: none !important;
}
[data-theme="dark"] .logo-dark-mode {
  display: block !important;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(0, 184, 255, 0.35);
  transition: transform var(--transition-fast);
}

.brand-logo:hover .brand-icon {
  transform: scale(1.05);
}

.brand-text span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 中间导航 (Center: icon-paired nav links with subtle hover pill highlights) */
.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 13px;
  font-size: 0.92rem;
  font-weight: 550;
  color: var(--text-muted);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-link svg {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

.nav-link:hover svg {
  color: var(--accent-cyan);
}

.nav-link.highlight-nav {
  color: var(--accent-cyan);
  background: var(--accent-subtle);
  border: 1px solid rgba(0, 184, 255, 0.22);
}

.nav-link.highlight-nav:hover {
  background: rgba(0, 184, 255, 0.16);
}

/* 导航右侧操作栏 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* 昼夜模式切换按钮 */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  position: relative;
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
  background: var(--accent-subtle);
  transform: translateY(-1px);
}

.theme-icon-sun,
.theme-icon-moon {
  position: absolute;
  width: 18px;
  height: 18px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

html:not([data-theme="dark"]) .theme-icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #F59E0B;
}
html:not([data-theme="dark"]) .theme-icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}
[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #00B8FF;
}

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.94rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  border: none;
  min-height: 42px;
}

.btn-cyan {
  background: var(--accent-cyan);
  color: #FFFFFF;
  box-shadow: var(--shadow-cyan-glow);
}

.btn-cyan:hover {
  background: var(--accent-cyan-hover);
  box-shadow: var(--shadow-cyan-glow-lg);
  transform: translateY(-1px);
  color: #FFFFFF;
}

.btn-cyan:active {
  transform: translateY(1px);
}

.btn-pill {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  min-height: 38px;
  font-size: 0.9rem;
}

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

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

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: var(--accent-subtle);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 13px 30px;
  font-size: 1.05rem;
  min-height: 50px;
}

.btn-block {
  width: 100%;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* ==========================================================================
   Hero 主视觉区 (Headline + 副标题 + 简介)
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 80px 0 60px;
  text-align: center;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--accent-subtle);
  border: 1px solid rgba(0, 184, 255, 0.25);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.hero-title {
  font-size: clamp(2.3rem, 5vw, 3.8rem);
  font-weight: 850;
  line-height: 1.2;
  letter-spacing: -1px;
  color: var(--text-primary);
  margin-bottom: 18px;
  max-width: 980px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.15rem, 2.2vw, 1.35rem);
  color: var(--text-secondary);
  font-weight: 600;
  max-width: 780px;
  margin: 0 auto 16px;
  line-height: 1.5;
}

.hero-intro {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px;
  line-height: 1.75;
}

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

.hero-trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 26px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.trust-item svg {
  color: var(--accent-cyan);
}

/* ==========================================================================
   Section 通用规范
   ========================================================================== */
.section-wrapper {
  padding: 85px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-tertiary);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   产品核心优势卡片（3个图文卡片）
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 34px 28px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 184, 255, 0.4);
  box-shadow: var(--shadow-lg), var(--shadow-cyan-glow);
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: var(--accent-subtle);
  border: 1px solid rgba(0, 184, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 22px;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.feature-card:hover .feature-icon-wrapper {
  transform: scale(1.08);
  background: var(--accent-gradient);
  color: #FFFFFF;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 750;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-checklist {
  list-style: none;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.feature-checklist-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-checklist-item svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* ==========================================================================
   流媒体图卡与 AI 支持图卡
   ========================================================================== */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.showcase-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 184, 255, 0.35);
  box-shadow: var(--shadow-lg);
}

.showcase-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.showcase-icon-box {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  flex-shrink: 0;
}

.showcase-icon-box.stream {
  background: linear-gradient(135deg, #00B8FF 0%, #3B82F6 100%);
  box-shadow: 0 4px 16px rgba(0, 184, 255, 0.3);
}

.showcase-icon-box.ai {
  background: linear-gradient(135deg, #7C5CFF 0%, #00B8FF 100%);
  box-shadow: 0 4px 16px rgba(124, 92, 255, 0.3);
}

.showcase-title {
  font-size: 1.35rem;
  font-weight: 750;
}

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

.showcase-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.pills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.pill-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.pill-item:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  transform: translateX(2px);
}

.pill-badge {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  color: #FFFFFF;
}

.badge-stream { background: #00B8FF; }
.badge-ai { background: #7C5CFF; }

.showcase-foot {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.showcase-foot strong {
  color: var(--accent-cyan);
}

/* ==========================================================================
   SaaS 3-Column Pricing Grid (参考网上真实套餐价格)
   - Large rounded white cards (24px radius)
   - Center recommended card elevated with crisp 1.5px bright cyan border (#00B8FF)
   - Large bold price numbers (¥8.00 / ¥9.90 / ¥17.00) in cyan-to-violet gradient
   - Clean feature checklist using thin circular cyan checkmarks (✓) & gray circular crosses (✕)
   - Full-width rounded bright cyan "立即订阅" buttons
   ========================================================================== */
.pricing-cycle-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 40px;
}

.cycle-toggle-bar {
  display: inline-flex;
  background: var(--bg-card);
  padding: 4px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.cycle-btn {
  padding: 8px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cycle-btn.active {
  background: var(--accent-cyan);
  color: #FFFFFF;
  box-shadow: var(--shadow-cyan-glow);
}

.cycle-btn:hover:not(.active) {
  color: var(--text-primary);
}

.cycle-discount-pill {
  font-size: 0.72rem;
  padding: 2px 6px;
  background: rgba(124, 92, 255, 0.15);
  color: var(--accent-violet);
  border-radius: var(--radius-full);
  margin-left: 4px;
  font-weight: 700;
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 38px 30px;
  position: relative;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
}

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

/* 中间推荐卡片 */
.pricing-card.featured {
  border: 1.5px solid var(--accent-cyan);
  box-shadow: var(--shadow-card), var(--shadow-cyan-glow);
  transform: translateY(-8px);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: translateY(-12px);
  box-shadow: var(--shadow-lg), var(--shadow-cyan-glow-lg);
}

.recommended-pill {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #FFFFFF;
  padding: 3px 16px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(0, 184, 255, 0.35);
}

.plan-header {
  margin-bottom: 16px;
}

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

.plan-tier-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 40px;
}

.plan-price-row {
  margin: 18px 0 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

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

/* 大号渐变价格数字 */
.plan-amount {
  font-size: 2.85rem;
  font-weight: 850;
  line-height: 1;
  letter-spacing: -1.5px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: opacity 0.2s ease;
}

.plan-interval {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-left: 2px;
}

.feature-checklist-group {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.feature-check-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.feature-check-item.bold-item {
  color: var(--text-primary);
  font-weight: 600;
}

/* Thin circular cyan checkmarks (✓) */
.circle-check {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(0, 184, 255, 0.12);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Muted gray circular crosses (✕) */
.circle-cross {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(148, 163, 184, 0.15);
  color: #94A3B8;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.feature-check-item.disabled-item {
  color: var(--text-muted);
  text-decoration: line-through;
  opacity: 0.7;
}

/* 套餐下方链接 */
.pricing-footer-link {
  text-align: center;
  margin-top: 36px;
}

.all-plans-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-cyan);
  transition: gap var(--transition-fast);
}

.all-plans-link:hover {
  gap: 10px;
  color: var(--accent-cyan-hover);
}

/* ==========================================================================
   用户评价 (Testimonials)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 30px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 184, 255, 0.3);
  box-shadow: var(--shadow-lg);
}

.review-user-box {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 700;
  font-size: 1.05rem;
}

.review-user-name {
  font-size: 0.98rem;
  font-weight: 700;
}

.review-badge-verified {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.78rem;
  color: var(--accent-cyan);
  font-weight: 600;
}

.review-stars {
  color: #F59E0B;
  display: flex;
  gap: 2px;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.review-quote {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex-grow: 1;
}

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */
.faq-box {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item[open] {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-sm);
}

.faq-summary {
  padding: 18px 22px;
  font-size: 1.02rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

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

.faq-summary:hover {
  color: var(--accent-cyan);
}

.faq-arrow {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-normal);
  color: var(--text-muted);
  flex-shrink: 0;
}

.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  color: var(--accent-cyan);
}

.faq-body {
  padding: 0 22px 20px;
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ==========================================================================
   悬浮客服支持组件 (Floating Emerald Chat Widget #0D7A5F)
   Strictly minimalist line icon only, no sparkles
   ========================================================================== */
.floating-chat-widget {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
}

.chat-bubble-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--chat-emerald);
  color: #FFFFFF;
  border: none;
  box-shadow: 0 8px 24px rgba(13, 122, 95, 0.4);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  position: relative;
}

.chat-bubble-btn:hover {
  background: var(--chat-emerald-hover);
  transform: scale(1.08) translateY(-2px);
  box-shadow: 0 12px 30px rgba(13, 122, 95, 0.5);
  color: #FFFFFF;
}

.chat-bubble-badge {
  position: absolute;
  top: 0;
  right: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #10B981;
  border: 2px solid #FFFFFF;
}

/* ==========================================================================
   页脚 Footer (只保留四个指定标题并新页面打开)
   1. 网站地图
   2. 关于我们
   3. 服务条款
   4. 隐私政策
   ========================================================================== */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 46px 0 36px;
  margin-top: 60px;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.footer-link-item {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.footer-link-item:hover {
  color: var(--accent-cyan);
  background: var(--accent-subtle);
}

.footer-meta-info {
  text-align: center;
  padding-top: 22px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.86rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   资讯/文章页面结构
   ========================================================================== */
.article-header {
  padding: 24px 0 20px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 28px;
}

.article-title {
  font-size: 2.1rem;
  font-weight: 850;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.article-meta {
  display: flex;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-content {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1rem;
}

.article-content h2 {
  font-size: 1.4rem;
  font-weight: 750;
  color: var(--text-primary);
  margin: 32px 0 14px;
}

.article-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 22px 0 10px;
}

.article-content p {
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

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

.article-card-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.article-card-item:hover {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   移动端响应式 (@media) - 确保手机端单栏与流畅触控
   ========================================================================== */
@media (max-width: 992px) {
  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .media-ai-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .site-nav {
    display: none;
  }

  .site-nav.mobile-active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 20px;
    box-shadow: var(--shadow-lg);
    gap: 10px;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero-section {
    padding: 46px 0 36px;
  }

  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }

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

  .hero-intro {
    font-size: 0.94rem;
  }

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

  .hero-actions .btn {
    width: 100%;
  }

  .hero-trust-bar {
    flex-direction: column;
    gap: 10px;
  }

  .pills-grid {
    grid-template-columns: 1fr;
  }

  .footer-nav-list {
    flex-direction: column;
    gap: 14px;
    text-align: center;
  }

/* ==========================================================================
   SEO 文章页面高级排版与相关推荐样式
   ========================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.breadcrumb .separator {
  color: #94A3B8;
  font-size: 0.8rem;
}

.breadcrumb .current {
  color: var(--text-primary);
  font-weight: 600;
}

.article-shell {
  max-width: 880px;
  margin: 36px auto 70px;
  padding: 42px 38px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
}

.article-main-title {
  font-size: clamp(1.8rem, 3.4vw, 2.35rem);
  font-weight: 850;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.article-meta-tag {
  background: var(--accent-subtle);
  color: var(--accent-cyan);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.8rem;
}

/* 目录 Table of Contents */
.toc-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-cyan);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 22px 26px;
  margin: 28px 0 36px;
}

.toc-title {
  font-size: 1.08rem;
  font-weight: 750;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.toc-list li a {
  color: var(--text-secondary);
  font-size: 0.94rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

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

/* 深度长文正文排版 */
.prose-article {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.85;
}

.prose-article h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.prose-article h3 {
  font-size: 1.2rem;
  font-weight: 750;
  color: var(--text-primary);
  margin: 26px 0 12px;
}

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

.prose-article ul, .prose-article ol {
  padding-left: 24px;
  margin-bottom: 22px;
}

.prose-article li {
  margin-bottom: 9px;
}

.prose-article strong {
  color: var(--text-primary);
}

.prose-article .tip-box {
  background: var(--accent-subtle);
  border: 1px solid rgba(0, 184, 255, 0.25);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin: 26px 0;
  color: var(--text-secondary);
  font-size: 0.96rem;
}

.prose-article .tip-box strong {
  color: var(--accent-cyan);
}

/* 文中高亮内链样式 */
.intext-link {
  color: var(--accent-cyan);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color var(--transition-fast);
}

.intext-link:hover {
  color: var(--accent-cyan-hover);
}

/* 专属文章 CTA 横幅 */
.article-cta-box {
  background: linear-gradient(135deg, rgba(0, 184, 255, 0.08) 0%, rgba(124, 92, 255, 0.08) 100%);
  border: 1.5px solid var(--accent-cyan);
  border-radius: var(--radius-lg);
  padding: 30px;
  text-align: center;
  margin: 40px 0;
}

.article-cta-box h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.article-cta-box p {
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto 20px;
  font-size: 0.95rem;
}

/* 文章专属 FAQ 样式 */
.article-faq-wrapper {
  margin: 42px 0;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.article-faq-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 18px;
  color: var(--text-primary);
}

/* 相关阅读 Recommended Posts */
.related-posts-section {
  margin-top: 50px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
}

.related-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.related-card {
  padding: 18px 20px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-card);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.related-card h4 {
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 8px;
  color: var(--text-primary);
}

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

.related-card-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: auto;
}

/* 资讯中心文章列表卡片网格 */
.articles-archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0 60px;
}

.archive-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 26px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.archive-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-lg);
}

.archive-card-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: var(--accent-subtle);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  align-self: flex-start;
}

.archive-card-title {
  font-size: 1.18rem;
  font-weight: 800;
  line-height: 1.5;
  margin-bottom: 12px;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.archive-card:hover .archive-card-title {
  color: var(--accent-cyan);
}

.archive-card-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 18px;
  flex-grow: 1;
}

.archive-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.archive-read-link {
  color: var(--accent-cyan);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

@media (max-width: 768px) {
  .article-shell {
    padding: 24px 18px;
    margin: 20px auto 40px;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .articles-archive-grid {
    grid-template-columns: 1fr;
  }
}