/* ==========================================================================
   Riolu 精灵学院机场 (riolu443.shop) - 原生核心样式表
   零重型外部依赖 · 秒开级加载性能 · 现代化科技深色美学
   ========================================================================== */

:root {
  --color-bg-base: #060911;
  --color-bg-surface: #0b1120;
  --color-bg-card: rgba(15, 23, 42, 0.75);
  --color-bg-card-hover: rgba(30, 41, 59, 0.85);
  --color-bg-glass: rgba(11, 17, 32, 0.82);

  --color-primary: #38bdf8;
  --color-primary-light: #7dd3fc;
  --color-primary-dark: #0284c7;
  --color-secondary: #3b82f6;
  --color-accent-gold: #f59e0b;
  --color-accent-emerald: #10b981;
  --color-accent-purple: #8b5cf6;

  --color-text-main: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-text-dim: #64748b;
  --color-text-inverse: #030712;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-primary: rgba(56, 189, 248, 0.28);
  --border-primary-glow: rgba(56, 189, 248, 0.6);

  --glow-primary: 0 0 25px rgba(56, 189, 248, 0.35);
  --glow-accent: 0 0 30px rgba(59, 130, 246, 0.4);

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

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

  --container-max-width: 1240px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-family-base);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-main);
  background-color: var(--color-bg-base);
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: transparent;
}

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

a:hover {
  color: var(--color-primary-light);
}

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

ul, ol {
  list-style: none;
}

/* ==========================================================================
   动态科技与宝可梦背景系统 (Dynamic Background)
   ========================================================================== */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
  pointer-events: none;
}

.ambient-aurora {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

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

.aurora-sphere {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.22;
  will-change: transform;
  animation: floatOrb 18s ease-in-out infinite alternate;
}

.aurora-sphere-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #0284c7 0%, rgba(2, 132, 199, 0) 70%);
  top: -150px;
  right: -100px;
  animation-duration: 22s;
}

.aurora-sphere-2 {
  width: 750px;
  height: 750px;
  background: radial-gradient(circle, #2563eb 0%, rgba(37, 99, 235, 0) 70%);
  bottom: 10%;
  left: -200px;
  animation-duration: 26s;
  animation-delay: -5s;
}

.aurora-sphere-3 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #8b5cf6 0%, rgba(139, 92, 246, 0) 70%);
  top: 40%;
  right: 15%;
  animation-duration: 20s;
  animation-delay: -10s;
}

@keyframes floatOrb {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(40px, 35px) scale(1.08);
  }
  100% {
    transform: translate(-30px, -20px) scale(0.95);
  }
}

/* 页面栅格与容器 */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   导航头部 (Header & Navbar)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--color-bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-smooth);
}

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

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

.brand-logo-img {
  height: 48px;
  width: auto;
  transition: transform var(--transition-smooth);
}

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

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: #ffffff;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transition: width var(--transition-fast);
  border-radius: 2px;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text-main);
  padding: 8px;
}

/* ==========================================================================
   按钮系统 (Buttons & CTA)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  padding: 13px 26px;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-smooth);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  color: #ffffff;
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 4px 18px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  color: #ffffff;
  transform: translateY(-2px);
  background: linear-gradient(135deg, #38bdf8 0%, #1d4ed8 100%);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.5);
}

.btn-outline {
  background: rgba(15, 23, 42, 0.6);
  color: var(--color-primary-light);
  border-color: var(--border-primary);
  backdrop-filter: blur(6px);
}

.btn-outline:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--color-primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-glow {
  position: relative;
  overflow: hidden;
}

.btn-glow::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.25) 0%, transparent 60%);
  transform: scale(0);
  opacity: 0;
  transition: transform 0.6s ease, opacity 0.6s ease;
}

.btn-glow:hover::before {
  transform: scale(1);
  opacity: 1;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.08rem;
  border-radius: var(--radius-full);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Hero 首屏模块
   ========================================================================== */
.hero-section {
  padding: 72px 0 60px;
  position: relative;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--color-primary-light);
  margin-bottom: 24px;
}

.badge-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--color-accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-accent-emerald);
  animation: pulsePing 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes pulsePing {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(1.3);
  }
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
  color: #ffffff;
}

.text-gradient {
  background: linear-gradient(135deg, #38bdf8 0%, #60a5fa 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-desc strong {
  color: #ffffff;
  font-weight: 600;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  color: var(--color-text-dim);
  font-size: 0.88rem;
  flex-wrap: wrap;
}

.hero-guarantee span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-guarantee svg {
  color: var(--color-accent-emerald);
}

/* 信任指标面板 (Metrics Grid) */
.metrics-strip {
  margin-top: 54px;
  padding: 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.metric-item {
  text-align: center;
  padding: 10px;
  border-right: 1px solid var(--border-subtle);
}

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

.metric-number {
  font-size: 2.1rem;
  font-weight: 800;
  font-family: var(--font-family-mono);
  color: #ffffff;
  line-height: 1.2;
}

.metric-number span {
  color: var(--color-primary);
  font-size: 1.2rem;
}

.metric-label {
  font-size: 0.86rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ==========================================================================
   通用区块骨架 (Section Base)
   ========================================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-badge {
  display: inline-block;
  padding: 4px 14px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.85rem, 3.2vw, 2.5rem);
  font-weight: 800;
  color: #ffffff;
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.68;
}

/* ==========================================================================
   套餐价格模块：严格执行“所有价格要同排”
   桌面端 (>=992px) 4列并排同排展示，高度绝对统一
   ========================================================================== */
.pricing-section {
  position: relative;
  background: linear-gradient(180deg, transparent 0%, rgba(15, 23, 42, 0.45) 50%, transparent 100%);
}

.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  position: relative;
  background: var(--color-bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 34px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(14px);
  transition: all var(--transition-smooth);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-primary);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45), var(--glow-primary);
}

/* 推荐热门套餐高亮卡片 */
.pricing-card-featured {
  background: linear-gradient(180deg, rgba(30, 58, 138, 0.35) 0%, rgba(15, 23, 42, 0.88) 100%);
  border-color: rgba(56, 189, 248, 0.55);
  box-shadow: 0 12px 32px rgba(37, 99, 235, 0.22), 0 0 20px rgba(56, 189, 248, 0.18);
  transform: scale(1.02);
  z-index: 2;
}

.pricing-card-featured:hover {
  transform: scale(1.02) translateY(-6px);
  border-color: var(--color-primary-light);
  box-shadow: 0 20px 42px rgba(37, 99, 235, 0.35), var(--glow-primary);
}

.pricing-badge-popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #f59e0b 0%, #ef4444 100%);
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 20px;
}

.pricing-tier-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.pricing-tier-desc {
  font-size: 0.84rem;
  color: var(--color-text-muted);
  min-height: 38px;
  line-height: 1.45;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 22px;
}

.pricing-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
}

.pricing-amount {
  font-size: 2.8rem;
  font-weight: 900;
  font-family: var(--font-family-mono);
  color: #ffffff;
  line-height: 1;
}

.pricing-period {
  font-size: 0.86rem;
  color: var(--color-text-muted);
  margin-left: 2px;
}

.pricing-sub-calc {
  font-size: 0.78rem;
  color: var(--color-accent-emerald);
  margin-top: 6px;
  font-weight: 500;
}

.pricing-features-list {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 28px;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: #cbd5e1;
  line-height: 1.45;
}

.pricing-feature-item svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-primary);
}

.pricing-feature-item strong {
  color: #ffffff;
  font-weight: 600;
}

.pricing-cta-wrap {
  margin-top: auto;
}

/* 备用按量付费提示卡片 */
.ondemand-banner {
  margin-top: 36px;
  padding: 24px 32px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px dashed var(--border-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.ondemand-content h4 {
  font-size: 1.08rem;
  color: #ffffff;
  margin-bottom: 4px;
}

.ondemand-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   核心技术特性 (Features Grid)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(10px);
  transition: all var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-primary);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   精选文章专栏 (Articles Section)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--color-bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(10px);
  transition: all var(--transition-smooth);
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-primary);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.35);
}

.article-meta-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.article-tag {
  font-size: 0.74rem;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.09);
  color: var(--color-primary-light);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 10px;
  transition: color var(--transition-fast);
}

.article-card:hover .article-card-title {
  color: var(--color-primary);
}

.article-card-summary {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
  font-size: 0.8rem;
  color: var(--color-text-dim);
}

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-primary);
  font-weight: 600;
}

/* ==========================================================================
   客户端支持矩阵 (Client Matrix)
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.client-card {
  background: var(--color-bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px;
  text-align: center;
  transition: all var(--transition-fast);
}

.client-card:hover {
  border-color: var(--border-primary);
  background: var(--color-bg-card-hover);
}

.client-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 12px;
  color: var(--color-primary);
}

.client-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

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

/* ==========================================================================
   真实用户评价 (Testimonials)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--color-bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(8px);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.65;
  margin-bottom: 20px;
}

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

.review-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #2563eb);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  font-size: 0.9rem;
}

.review-user-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
}

.review-user-role {
  font-size: 0.78rem;
  color: var(--color-text-dim);
}

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

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

.faq-item[open],
.faq-item.active {
  border-color: var(--border-primary);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  user-select: none;
}

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

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

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

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.93rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

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

/* ==========================================================================
   底部全站呼吁行动 (CTA Banner)
   ========================================================================== */
.cta-banner-section {
  padding: 70px 0;
}

.cta-banner-box {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.15) 0%, rgba(37, 99, 235, 0.22) 100%);
  border: 1px solid var(--border-primary-glow);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5), var(--glow-accent);
  position: relative;
  overflow: hidden;
}

.cta-banner-title {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 14px;
}

.cta-banner-desc {
  font-size: 1.08rem;
  color: #cbd5e1;
  max-width: 680px;
  margin: 0 auto 32px;
}

/* ==========================================================================
   页脚与友情外链 (Footer & Outbound Links)
   ========================================================================== */
.site-footer {
  background: #04060b;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  font-size: 0.88rem;
  color: var(--color-text-dim);
}

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

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

.footer-column-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

/* ==========================================================================
   响应式断点控制 (Responsive Queries)
   关键要求：桌面端价格同排展示！
   ========================================================================== */
@media (max-width: 1100px) {
  .pricing-grid-same-row {
    gap: 14px;
  }
  .pricing-card {
    padding: 24px 18px;
  }
  .pricing-amount {
    font-size: 2.4rem;
  }
  .features-grid,
  .articles-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 991px) {
  /* 平板端根据实际空间自适应，桌面端 >=992px 则严格保持4列单排并列 */
  .pricing-grid-same-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card-featured {
    transform: none;
  }
  .pricing-card-featured:hover {
    transform: translateY(-6px);
  }
  .metrics-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .metric-item:nth-child(2) {
    border-right: none;
  }
  .metric-item:nth-child(1),
  .metric-item:nth-child(2) {
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 16px;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 74px;
    left: 0;
    width: 100%;
    background: var(--color-bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
  }
  .main-nav.open {
    display: flex;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .pricing-grid-same-row {
    grid-template-columns: 1fr;
  }
  .features-grid,
  .articles-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .clients-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .metrics-strip {
    grid-template-columns: 1fr;
  }
  .metric-item {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }
  .metric-item:last-child {
    border-bottom: none;
  }
  .ondemand-banner {
    flex-direction: column;
    text-align: center;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}