/* ==========================================================================
   灯塔VPN (dengtajiasu.cfd) - 原生极速 CSS 样式表
   零重型框架依赖 | 秒开级加载速度 | 全端完美自适应
   ========================================================================== */

:root {
  --bg-main: #070b14;
  --bg-card: rgba(19, 29, 49, 0.72);
  --bg-card-hover: rgba(28, 42, 69, 0.85);
  --bg-card-solid: #111a2e;
  --bg-header: rgba(7, 11, 20, 0.82);

  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --primary-rgb: 56, 189, 248;
  --accent-gold: #fbbf24;
  --accent-gold-rgb: 251, 191, 36;
  --accent-emerald: #10b981;
  --accent-emerald-rgb: 16, 185, 129;
  --accent-purple: #a855f7;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(56, 189, 248, 0.4);

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

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

  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5), 0 0 1px 1px rgba(255, 255, 255, 0.05);
  --shadow-glow: 0 0 35px -5px rgba(56, 189, 248, 0.35);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.65;
  font-size: 16px;
}

/* 动态背景画布与环境光晕 */
#dynamic-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.92;
}

.ambient-lights {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.ambient-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.18;
  animation: floatAmbient 18s ease-in-out infinite alternate;
}

.ambient-glow-1 {
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.4) 0%, rgba(2, 132, 199, 0.1) 70%, transparent 100%);
  top: -150px;
  left: 10%;
}

.ambient-glow-2 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(251, 191, 36, 0.32) 0%, rgba(245, 158, 11, 0.08) 70%, transparent 100%);
  top: 40%;
  right: -100px;
  animation-duration: 22s;
  animation-direction: alternate-reverse;
}

.ambient-glow-3 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.25) 0%, rgba(5, 150, 105, 0.05) 70%, transparent 100%);
  bottom: 5%;
  left: -80px;
  animation-duration: 25s;
}

.cyber-grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 1;
}

@keyframes floatAmbient {
  0% { transform: translateY(0) scale(1); }
  50% { transform: translateY(40px) scale(1.08) translateX(25px); }
  100% { transform: translateY(-30px) scale(0.95) translateX(-20px); }
}

/* 页面包装层 */
.site-wrapper {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-header);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: background var(--transition-fast);
}

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

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo-svg {
  height: 42px;
  width: auto;
  display: block;
}

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

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  padding: 6px 4px;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border-light);
  color: var(--text-main);
  font-size: 20px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  color: #070b14;
  box-shadow: 0 4px 18px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #7dd3fc 0%, #0369a1 100%);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.55);
  transform: translateY(-2px);
  color: #030712;
}

.btn-glow {
  position: relative;
}

.btn-glow::before {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(135deg, #38bdf8, #fbbf24);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn-glow:hover::before {
  opacity: 0.6;
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
}

.btn-md {
  padding: 12px 24px;
  font-size: 15px;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
}

/* 文本渐变 */
.text-gradient {
  background: linear-gradient(135deg, #ffffff 15%, #38bdf8 65%, #fbbf24 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-gold {
  background: linear-gradient(135deg, #fbbf24 20%, #f59e0b 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Hero 区域 */
.hero-section {
  padding: 75px 0 60px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: var(--radius-full);
  color: var(--primary);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 52px;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 22px;
  color: #ffffff;
}

.hero-subtitle {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 860px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-value {
  font-size: 32px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #ffffff;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
}

/* 通用区块头 */
.section {
  padding: 80px 0;
  position: relative;
}

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

.section-badge {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-full);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 14px;
  color: #ffffff;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 节点实时延迟监控表 */
.nodes-table-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.nodes-table-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-light);
  background: rgba(255, 255, 255, 0.02);
}

.nodes-live-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--accent-emerald);
  font-weight: 600;
}

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

.nodes-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.nodes-table th {
  padding: 14px 20px;
  color: var(--text-dim);
  font-weight: 600;
  font-size: 13px;
  border-bottom: 1px solid var(--border-light);
}

.nodes-table td {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  vertical-align: middle;
}

.nodes-table tr:hover td {
  background: rgba(56, 189, 248, 0.03);
}

.node-flag {
  font-size: 18px;
  margin-right: 8px;
}

.node-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.node-tag-iepl {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.node-tag-isp {
  background: rgba(251, 191, 36, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(251, 191, 36, 0.3);
}

.ping-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-emerald);
}

/* 核心优势板块 6列卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   套餐价格表：严格要求“所有价格要同排”
   ========================================================================== */
.pricing-section {
  position: relative;
}

.pricing-grid-same-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 16px 40px -10px rgba(56, 189, 248, 0.25);
}

/* 推荐热门卡片高亮 */
.pricing-card-featured {
  background: linear-gradient(180deg, rgba(28, 45, 78, 0.85) 0%, rgba(17, 26, 46, 0.95) 100%);
  border: 2px solid var(--primary);
  box-shadow: 0 16px 48px -8px rgba(56, 189, 248, 0.4);
}

.pricing-badge-popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  color: #070b14;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
  white-space: nowrap;
}

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

.pricing-tier-name {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.pricing-tier-desc {
  font-size: 13px;
  color: var(--text-muted);
  min-height: 38px;
}

.pricing-price-box {
  text-align: center;
  padding: 16px 0;
  margin-bottom: 20px;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.pricing-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  vertical-align: top;
}

.pricing-amount {
  font-size: 42px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #ffffff;
  line-height: 1;
}

.pricing-period {
  font-size: 14px;
  color: var(--text-muted);
  margin-left: 2px;
}

.pricing-monthly-calc {
  font-size: 12px;
  color: var(--accent-emerald);
  margin-top: 6px;
  font-weight: 600;
}

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

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.45;
}

.pricing-feature-item strong {
  color: var(--text-main);
}

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

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

.pricing-tip {
  text-align: center;
  margin-top: 28px;
  font-size: 14px;
  color: var(--text-dim);
}

/* 场景板块 */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.scenario-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
}

.scenario-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
}

.scenario-icon {
  font-size: 28px;
  margin-bottom: 14px;
  display: block;
}

.scenario-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #ffffff;
}

.scenario-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 文章专栏精选展示 */
.articles-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  text-decoration: none;
  box-shadow: var(--shadow-card);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
}

.article-badge {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
  align-self: flex-start;
}

.article-card-title {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 10px;
}

.article-card-excerpt {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

/* 用户评价板块 */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
}

.testimonial-stars {
  color: #fbbf24;
  font-size: 14px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.testimonial-quote {
  font-size: 14px;
  color: #cbd5e1;
  line-height: 1.6;
  margin-bottom: 18px;
  font-style: italic;
}

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

.user-avatar-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
  color: #ffffff;
}

.user-info-name {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
}

.user-info-role {
  font-size: 12px;
  color: var(--text-dim);
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: rgba(56, 189, 248, 0.4);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: inherit;
}

.faq-icon {
  font-size: 20px;
  color: var(--primary);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  padding-bottom: 20px;
  transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
}

/* 权威生态外链板块 */
.ecosystem-section {
  padding: 40px 0 60px;
  border-top: 1px solid var(--border-light);
}

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

.ecosystem-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.ecosystem-card:hover {
  background: rgba(56, 189, 248, 0.06);
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateY(-2px);
}

.ecosystem-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  flex-shrink: 0;
}

.ecosystem-name {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
}

.ecosystem-desc {
  font-size: 12px;
  color: var(--text-dim);
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border-light);
  background: rgba(7, 11, 20, 0.95);
  padding: 60px 0 30px;
  margin-top: auto;
}

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

.footer-brand-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin: 16px 0 20px;
  max-width: 360px;
}

.footer-col-title {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

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

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-dim);
}

/* 移动端与自适应断点 */
@media (max-width: 1024px) {
  .hero-title { font-size: 40px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid-same-row { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-preview-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .ecosystem-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .hero-title { font-size: 30px; }
  .hero-subtitle { font-size: 15px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid-same-row { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .articles-preview-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .ecosystem-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }

  .mobile-menu-btn { display: block; }
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(7, 11, 20, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-light);
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
    z-index: 99;
  }
  .nav-menu.open {
    transform: translateY(0);
  }
}