/* ==========================================================================
   五树云 WushuCloud (wushucloud.cfd) — 纯原生零依赖极速样式系统
   纯 HTML5 + 原生 CSS3 | 零外部 JS 库 | 动态流光极速背景 | 4联价格卡片同排布局
   ========================================================================== */

:root {
  --bg-dark: #050811;
  --bg-card: rgba(11, 18, 32, 0.75);
  --bg-card-hover: rgba(16, 26, 46, 0.9);
  --bg-glass: rgba(11, 18, 32, 0.65);
  --border-subtle: rgba(148, 163, 184, 0.14);
  --border-glow: rgba(16, 185, 129, 0.4);
  --border-cyan: rgba(6, 182, 212, 0.4);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --emerald-400: #34d399;
  --emerald-500: #10b981;
  --cyan-400: #22d3ee;
  --cyan-500: #06b6d4;
  --blue-500: #3b82f6;
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --rose-500: #f43f5e;

  --grad-primary: linear-gradient(135deg, #10b981 0%, #06b6d4 50%, #3b82f6 100%);
  --grad-badge: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(6, 182, 212, 0.15));
  --grad-hot: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);

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

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 16px 36px -12px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 30px -6px rgba(16, 185, 129, 0.35);

  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --max-width: 1240px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-dark);
}

body {
  font-family: var(--font-base);
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
  background: transparent;
}

main,
.site-footer {
  position: relative;
  z-index: 2;
}

/* ==========================================================================
   动态高画质茶园与云雾系统 (Dynamic 4K Tea Garden & Misty Mountains)
   ========================================================================== */
.dynamic-bg-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 4K 茶园超清自然摄影运镜 (Cinematic Ken Burns Effect) */
.tea-garden-layer {
  position: absolute;
  top: -6%;
  left: -6%;
  width: 112%;
  height: 112%;
  background-image: url('assets/tea-garden-4k.jpg'), url('assets/tea-garden.jpg');
  background-size: cover;
  background-position: center 30%;
  background-repeat: no-repeat;
  filter: saturate(1.25) brightness(0.85) contrast(1.05);
  animation: teaGardenCinematic 30s ease-in-out infinite alternate;
  transform-origin: 50% 35%;
  will-change: transform;
}

@keyframes teaGardenCinematic {
  0% {
    transform: scale(1) translate3d(0, 0, 0);
  }
  50% {
    transform: scale(1.08) translate3d(-1.5%, -1%);
  }
  100% {
    transform: scale(1.03) translate3d(1.2%, 0.8%);
  }
}

/* 动态流动茶山云雾 (Drifting Mountain Mist Layers) */
.tea-mist-layer {
  position: absolute;
  width: 220%;
  height: 100%;
  top: 0;
  left: -60%;
  pointer-events: none;
  will-change: transform;
}

.mist-1 {
  background: radial-gradient(ellipse 65% 35% at 30% 55%, rgba(200, 245, 225, 0.16) 0%, transparent 70%),
              radial-gradient(ellipse 75% 45% at 85% 40%, rgba(180, 235, 215, 0.14) 0%, transparent 65%);
  animation: mistFlow1 28s ease-in-out infinite alternate;
  filter: blur(45px);
}

.mist-2 {
  background: radial-gradient(ellipse 80% 40% at 55% 68%, rgba(52, 211, 153, 0.13) 0%, transparent 75%),
              radial-gradient(ellipse 60% 30% at 15% 42%, rgba(6, 182, 212, 0.11) 0%, transparent 65%);
  animation: mistFlow2 38s ease-in-out infinite alternate;
  filter: blur(55px);
}

@keyframes mistFlow1 {
  0% { transform: translate3d(-4%, 0, 0) scale(1); }
  50% { transform: translate3d(3%, -2%, 0) scale(1.06); }
  100% { transform: translate3d(5%, 1%, 0) scale(0.96); }
}

@keyframes mistFlow2 {
  0% { transform: translate3d(3%, 0, 0) scale(1); }
  50% { transform: translate3d(-4%, 2%, 0) scale(1.05); }
  100% { transform: translate3d(-2%, -1%, 0) scale(1.02); }
}

/* 晨曦金光与丁达尔光晕 (Morning Sunrise Golden Ray & Glow) */
.tea-sunbeam-glow {
  position: absolute;
  top: 0;
  right: 12%;
  width: 55vw;
  height: 55vh;
  background: radial-gradient(circle at 65% 10%, rgba(251, 191, 36, 0.18) 0%, rgba(16, 185, 129, 0.08) 45%, transparent 70%);
  filter: blur(65px);
  animation: sunGlowPulse 16s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes sunGlowPulse {
  0% { opacity: 0.55; transform: scale(1); }
  50% { opacity: 0.85; transform: scale(1.1) translateY(12px); }
  100% { opacity: 0.6; transform: scale(0.98); }
}

/* 柔和暗角保证前景内容高对比度与秒读 (Readability Vignette) */
.tea-vignette-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 30%, rgba(5, 9, 16, 0.28) 0%, rgba(4, 7, 14, 0.62) 75%, rgba(3, 6, 12, 0.88) 100%),
              linear-gradient(180deg, rgba(4, 7, 14, 0.32) 0%, rgba(5, 8, 17, 0.58) 65%, rgba(3, 5, 10, 0.95) 100%);
}

.cyber-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(148, 163, 184, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at 50% 30%, rgba(0, 0, 0, 0.8) 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 30%, rgba(0, 0, 0, 0.8) 0%, transparent 75%);
}

/* ==========================================================================
   布局结构与通用容器
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding-top: 84px;
  padding-bottom: 84px;
  position: relative;
}

.section-alt {
  background-color: rgba(6, 11, 22, 0.45);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  background: var(--grad-badge);
  border: 1px solid var(--border-glow);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--emerald-400);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* 渐变文本 */
.text-grad {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-gold {
  color: var(--amber-400);
}

/* ==========================================================================
   导航头部 Navbar
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(5, 8, 17, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.brand-link:hover {
  opacity: 0.92;
}

.brand-logo-img {
  height: 44px;
  width: auto;
  display: block;
}

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

.nav-item a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.96rem;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

.nav-item a:hover {
  color: #fff;
}

.nav-item a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--grad-primary);
  transition: width 0.25s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* ==========================================================================
   通用按钮规范 (CTA Buttons)
   规范：包含 rel="nofollow" target="_blank"
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 0.96rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-primary);
  color: #030a12;
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(16, 185, 129, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(16, 185, 129, 0.5);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border-color: var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.btn-glow {
  background: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
  color: #020b12;
  font-weight: 700;
  box-shadow: 0 0 24px rgba(16, 185, 129, 0.45);
}

.btn-glow:hover {
  box-shadow: 0 0 35px rgba(6, 182, 212, 0.65);
  transform: translateY(-2px) scale(1.02);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.08rem;
  border-radius: var(--radius-md);
}

.btn-full {
  width: 100%;
}

/* ==========================================================================
   Hero 头部主视觉
   ========================================================================== */
.hero-section {
  padding-top: 65px;
  padding-bottom: 75px;
  position: relative;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.35);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--emerald-400);
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--emerald-400);
  border-radius: 50%;
  box-shadow: 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulseGreen 1.8s infinite;
}

@keyframes pulseGreen {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 9px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  margin-bottom: 24px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.25;
}

.hero-brand-name {
  display: block;
  font-size: clamp(2.2rem, 4.2vw, 3.4rem);
  font-weight: 850;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.hero-slogan-line {
  display: inline-block;
  font-size: clamp(1.2rem, 2.5vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.hero-lead {
  font-size: 1.22rem;
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.75;
}

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

/* 信任指标徽章行 */
.trust-badge-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  padding: 20px 28px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 960px;
  margin: 0 auto;
  backdrop-filter: blur(12px);
}

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

.trust-item strong {
  color: #fff;
  font-weight: 700;
}

.trust-icon {
  color: var(--emerald-400);
  font-size: 1.15rem;
}

/* ==========================================================================
   价格区域 —— 核心要求：“所有价格要同排”
   ========================================================================== */
.pricing-section {
  position: relative;
}

.pricing-header-note {
  margin-top: -30px;
  margin-bottom: 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.94rem;
}

/* 核心：桌面端强制 4 列同排 (4 Columns in 1 Row) */
.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(14px);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-cyan);
  box-shadow: 0 20px 40px -15px rgba(6, 182, 212, 0.25);
  background: var(--bg-card-hover);
}

/* 热门推荐卡片 */
.pricing-card.is-popular {
  border-color: var(--emerald-500);
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.08) 0%, rgba(11, 18, 32, 0.88) 100%);
  box-shadow: 0 16px 36px -10px rgba(16, 185, 129, 0.3);
}

.pricing-card.is-popular:hover {
  box-shadow: 0 24px 48px -12px rgba(16, 185, 129, 0.45);
}

.popular-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--grad-primary);
  color: #030b14;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.card-top {
  margin-bottom: 22px;
}

.plan-tier {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--cyan-400);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.plan-name {
  font-size: 1.55rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.5;
  min-height: 38px;
}

.plan-pricing {
  margin: 20px 0 14px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-subtle);
}

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

.price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--emerald-400);
}

.price-amount {
  font-size: 2.85rem;
  font-weight: 850;
  color: #fff;
  line-height: 1;
}

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

.price-alternatives {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.price-alt-item {
  display: flex;
  justify-content: space-between;
}

.price-alt-item strong {
  color: var(--text-muted);
}

.plan-specs {
  margin: 18px 0 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.spec-item {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 0.88rem;
  color: var(--text-main);
  line-height: 1.45;
}

.spec-icon {
  color: var(--emerald-400);
  flex-shrink: 0;
  margin-top: 2px;
}

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

/* ==========================================================================
   核心卖点 / 特色功能 Grid (Core Features)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
  box-shadow: 0 16px 36px -12px rgba(16, 185, 129, 0.25);
  background: var(--bg-card-hover);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--emerald-400);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 750;
  color: #fff;
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.68;
}

/* ==========================================================================
   节点测速与全球网络状态表格
   ========================================================================== */
.node-status-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  overflow-x: auto;
  backdrop-filter: blur(14px);
}

.node-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.93rem;
}

.node-table th {
  padding: 14px 16px;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
  text-transform: uppercase;
  font-size: 0.82rem;
  letter-spacing: 0.05em;
}

.node-table td {
  padding: 16px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.08);
  color: var(--text-main);
  vertical-align: middle;
}

.node-table tr:last-child td {
  border-bottom: none;
}

.node-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.node-region {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.flag-icon {
  font-size: 1.2rem;
}

.status-badge-live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  color: var(--emerald-400);
  font-size: 0.8rem;
  font-weight: 600;
}

.tag-unlock {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(6, 182, 212, 0.12);
  color: var(--cyan-400);
  font-size: 0.78rem;
  margin-right: 4px;
  margin-bottom: 2px;
}

/* ==========================================================================
   精选技术文章区域 (Articles Grid)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-cyan);
  box-shadow: 0 16px 32px -12px rgba(6, 182, 212, 0.25);
  background: var(--bg-card-hover);
}

.article-category {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--cyan-400);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.article-title {
  font-size: 1.12rem;
  font-weight: 750;
  line-height: 1.45;
  color: #fff;
  margin-bottom: 10px;
}

.article-title a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

.article-title a:hover {
  color: var(--emerald-400);
}

.article-excerpt {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.tag-pill {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-dim);
}

.article-read-link {
  color: var(--emerald-400);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-read-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   用户评价与真实反馈 (User Reviews)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 158, 11, 0.35);
}

.review-stars {
  color: var(--amber-400);
  font-size: 1.05rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.94rem;
  color: var(--text-main);
  line-height: 1.68;
  margin-bottom: 20px;
  font-style: normal;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--grad-badge);
  border: 1px solid var(--border-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--emerald-400);
  font-size: 1rem;
}

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

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

.reviewer-role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.verified-tag {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  color: var(--emerald-400);
  font-size: 0.75rem;
}

/* ==========================================================================
   常见问题解答 FAQ (Native HTML Accordion)
   ========================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-item:hover {
  border-color: rgba(148, 163, 184, 0.3);
}

.faq-item[open] {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
}

.faq-summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-summary::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--emerald-400);
  transition: transform 0.25s ease;
}

.faq-item[open] .faq-summary::after {
  transform: rotate(45deg);
  color: var(--cyan-400);
}

.faq-answer {
  padding: 0 24px 22px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.72;
}

.faq-answer p {
  margin-bottom: 10px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   权威外部链接与生态工具 (External Links)
   ========================================================================== */
.ext-links-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.ext-link-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
}

.ext-link-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-cyan);
  background: rgba(16, 26, 46, 0.8);
}

.ext-link-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.ext-arrow {
  color: var(--emerald-400);
  font-size: 0.9rem;
}

.ext-link-desc {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ==========================================================================
   文章详情页样式 (Single Article Layout)
   ========================================================================== */
.article-header {
  padding: 50px 0 35px;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-dim);
  margin-bottom: 22px;
}

.breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--emerald-400);
}

.article-main-title {
  font-size: 2.6rem;
  font-weight: 850;
  line-height: 1.25;
  color: #fff;
  margin-bottom: 20px;
}

.article-post-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.article-content-body {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #e2e8f0;
}

.article-content-body h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: #fff;
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content-body h2:first-of-type {
  margin-top: 10px;
}

.article-content-body h3 {
  font-size: 1.28rem;
  font-weight: 750;
  color: var(--emerald-400);
  margin: 30px 0 12px;
}

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

.article-content-body ul, .article-content-body ol {
  margin-bottom: 24px;
  padding-left: 26px;
}

.article-content-body li {
  margin-bottom: 10px;
}

.article-content-body blockquote {
  border-left: 4px solid var(--emerald-500);
  background: rgba(16, 185, 129, 0.08);
  padding: 18px 22px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 26px 0;
  color: #cbd5e1;
  font-style: normal;
}

.article-content-body code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--cyan-400);
}

.article-content-body pre {
  background: #020610;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
}

.article-content-body pre code {
  background: transparent;
  padding: 0;
  color: #93c5fd;
  font-size: 0.88rem;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.12) 0%, rgba(6, 182, 212, 0.12) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  margin: 40px 0;
}

.article-cta-box h3 {
  color: #fff;
  margin-top: 0;
  margin-bottom: 10px;
}

.article-cta-box p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 20px;
}

/* 推荐相关阅读 */
.related-articles {
  max-width: 860px;
  margin: 48px auto 0;
}

.related-title {
  font-size: 1.35rem;
  font-weight: 750;
  color: #fff;
  margin-bottom: 20px;
}

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

/* ==========================================================================
   页脚 Footer
   ========================================================================== */
.site-footer {
  background: #02050c;
  border-top: 1px solid var(--border-subtle);
  padding-top: 60px;
  padding-bottom: 40px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  margin-top: 14px;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.65;
  max-width: 320px;
}

.footer-col-title {
  color: #fff;
  font-size: 0.98rem;
  font-weight: 750;
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s ease;
  font-size: 0.88rem;
}

.footer-links a:hover {
  color: var(--emerald-400);
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(148, 163, 184, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.84rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   响应式断点适配 (Responsive Design)
   ========================================================================== */
@media (max-width: 1200px) {
  .pricing-grid-same-row {
    gap: 14px;
  }
  .pricing-card {
    padding: 24px 16px;
  }
  .price-amount {
    font-size: 2.35rem;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .ext-links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(1, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
  /* 平板端也保持横向紧凑同排或弹性滑动 */
  .pricing-grid-same-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .hero-brand-name {
    font-size: 2.1rem;
    margin-bottom: 8px;
  }
  .hero-slogan-line {
    font-size: clamp(0.95rem, 4.3vw, 1.45rem);
    white-space: nowrap;
  }
  .hero-lead {
    font-size: 1.02rem;
  }
  .section {
    padding-top: 55px;
    padding-bottom: 55px;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .pricing-grid-same-row {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .ext-links-grid {
    grid-template-columns: 1fr;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .article-content-body {
    padding: 30px 20px;
  }
  .article-main-title {
    font-size: 1.85rem;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}