/* ==========================================================================
   客户端下载中心 (Download-First Hub) - 核心样式库
   配色规范:
   主背景底色: #F8FAFC (浅银灰)
   品牌强调色: #1D4ED8 (科技深蓝)
   卡片与背景: #FFFFFF (纯白)
   文本深灰:   #0F172A / #1E293B / #334155
   辅助边框:   #E2E8F0 / #CBD5E1
   状态色彩:   成功 #10B981, 警告 #F59E0B, 危险 #EF4444
   ========================================================================== */

:root {
  --bg-primary: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-card-subtle: #F1F5F9;
  --brand-blue: #1D4ED8;
  --brand-blue-hover: #1E40AF;
  --brand-blue-light: #EFF6FF;
  --brand-blue-glow: rgba(29, 78, 216, 0.15);
  --accent-cyan: #0284C7;
  --accent-green: #10B981;
  --accent-amber: #F59E0B;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --border-light: #E2E8F0;
  --border-hover: #CBD5E1;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 25px -3px rgba(15, 23, 42, 0.08), 0 4px 10px -4px rgba(15, 23, 42, 0.03);
  --shadow-glow: 0 0 25px rgba(29, 78, 216, 0.2);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1240px;
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  font-size: 16px;
  line-height: 1.6;
}

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

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

a:hover {
  color: var(--brand-blue-hover);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input {
  font-family: inherit;
  font-size: inherit;
}

/* 动态背景画布 */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.85;
}

/* 顶部通知公告条 */
.top-banner {
  background: linear-gradient(90deg, #1D4ED8 0%, #2563EB 50%, #0284C7 100%);
  color: #FFFFFF;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.6rem 1rem;
  text-align: center;
  position: relative;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.top-banner .badge {
  background: rgba(255, 255, 255, 0.22);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  letter-spacing: 0.5px;
}

.top-banner a {
  color: #FFFFFF;
  text-decoration: underline;
  font-weight: 600;
}

/* 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: all var(--transition-fast);
}

.navbar-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #1D4ED8 0%, #3B82F6 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  box-shadow: 0 4px 10px rgba(29, 78, 216, 0.35);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0F172A;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.logo-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.3rem 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--brand-blue);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-key-drawer {
  background: var(--brand-blue);
  color: #FFFFFF !important;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  box-shadow: 0 2px 8px rgba(29, 78, 216, 0.28);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-key-drawer:hover {
  background: var(--brand-blue-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(29, 78, 216, 0.36);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-primary);
}

/* 通用容器 */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--brand-blue);
  background: var(--brand-blue-light);
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 0.85rem;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 首屏 HERO / 客户端下载中心 */
.hero-download-hub {
  padding: 4rem 0 3rem 0;
  position: relative;
}

.hero-main-intro {
  text-align: center;
  max-width: 860px;
  margin: 0 auto 2.5rem auto;
}

.hero-sub-title {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #0369A1;
  background: #E0F2FE;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
  border: 1px solid #BAE6FD;
}

.hero-h1 {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.2;
  color: #0F172A;
  margin-bottom: 1.25rem;
  letter-spacing: -1px;
}

.hero-h1 .gradient-text {
  background: linear-gradient(135deg, #1D4ED8 0%, #0284C7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* 核心推荐系统（自适应检测系统卡片） */
.auto-detected-card {
  background: var(--bg-card);
  border: 2px solid #3B82F6;
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: 0 10px 30px rgba(29, 78, 216, 0.08), 0 1px 3px rgba(0, 0, 0, 0.05);
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
}

.auto-detected-card::before {
  content: "智能匹配您的操作系统";
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand-blue);
  background: var(--brand-blue-light);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(29, 78, 216, 0.2);
}

.detected-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
}

.detected-info {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
}

.detected-icon-box {
  width: 68px;
  height: 68px;
  background: var(--brand-blue-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-blue);
  font-size: 2.25rem;
  flex-shrink: 0;
  border: 1px solid rgba(29, 78, 216, 0.15);
}

.detected-texts h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.detected-version-tag {
  font-size: 0.75rem;
  color: var(--accent-green);
  background: #ECFDF5;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
  border: 1px solid #A7F3D0;
}

.detected-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.detected-meta-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.detected-meta-pills span {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: #F1F5F9;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

.detected-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 240px;
}

.btn-primary-download {
  background: linear-gradient(135deg, #1D4ED8 0%, #2563EB 100%);
  color: #FFFFFF !important;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.95rem 1.75rem;
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: 0 4px 14px rgba(29, 78, 216, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
}

.btn-primary-download:hover {
  background: linear-gradient(135deg, #1E40AF 0%, #1D4ED8 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(29, 78, 216, 0.45);
}

.btn-inline-config {
  background: #FFFFFF;
  color: var(--brand-blue) !important;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-inline-config:hover {
  background: var(--brand-blue-light);
  border-color: #93C5FD;
}

/* 下方全平台并排展示卡片网格 */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.platform-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-smooth);
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
}

.platform-card:hover {
  border-color: #93C5FD;
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.platform-card.active-tab {
  border-color: var(--brand-blue);
  box-shadow: 0 0 0 2px rgba(29, 78, 216, 0.15), var(--shadow-md);
}

.platform-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.platform-icon-circle {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: #F1F5F9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.platform-card:hover .platform-icon-circle {
  background: var(--brand-blue-light);
  color: var(--brand-blue);
}

.platform-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

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

.platform-specs {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.platform-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-light);
}

.btn-open-drawer {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--brand-blue);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.platform-badge {
  font-size: 0.7rem;
  background: #F1F5F9;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 4px;
}

/* 原地展开教程与订阅粘贴窗口 (Inline Accordion Drawer) */
.inline-config-drawer {
  grid-column: 1 / -1;
  background: #FFFFFF;
  border: 1px solid #BFDBFE;
  border-radius: var(--radius-md);
  padding: 2rem;
  margin-top: 1rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  display: none;
  animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.inline-config-drawer.is-open {
  display: block;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.drawer-title-group h4 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.drawer-title-group p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.btn-close-drawer {
  background: #F1F5F9;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.btn-close-drawer:hover {
  background: #E2E8F0;
  color: var(--text-primary);
}

.drawer-content-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
}

.drawer-steps {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.step-item {
  display: flex;
  gap: 1rem;
}

.step-num {
  width: 28px;
  height: 28px;
  background: var(--brand-blue);
  color: #FFFFFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.step-details h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.step-details p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.step-links {
  margin-top: 0.4rem;
  display: flex;
  gap: 0.75rem;
}

.step-link-btn {
  font-size: 0.785rem;
  font-weight: 600;
  color: var(--brand-blue);
  background: var(--brand-blue-light);
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid #BFDBFE;
}

.drawer-subscription-box {
  background: #F8FAFC;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.sub-box-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.sub-input-group {
  margin-bottom: 1rem;
}

.sub-input-group label {
  display: block;
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.input-with-button {
  display: flex;
  gap: 0.5rem;
}

.input-sub-url {
  flex-grow: 1;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.85rem;
  font-size: 0.825rem;
  color: var(--text-primary);
  outline: none;
}

.input-sub-url:focus {
  border-color: var(--brand-blue);
}

.btn-copy-sub {
  background: #334155;
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.95rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast);
}

.btn-copy-sub:hover {
  background: #1E293B;
}

.sub-help-card {
  background: #EFF6FF;
  border: 1px dashed #93C5FD;
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  margin-top: 1rem;
}

.sub-help-card p {
  font-size: 0.8rem;
  color: #1E3A8A;
  margin-bottom: 0.5rem;
}

.btn-buy-key-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--brand-blue);
}

/* 节点实时延迟与状态板块 */
.status-section {
  background: #FFFFFF;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.status-summary-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  background: #F8FAFC;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem 2rem;
  margin-bottom: 2.5rem;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--brand-blue);
  box-shadow: var(--shadow-sm);
}

.stat-value {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.775rem;
  color: var(--text-muted);
  font-weight: 500;
}

.nodes-table-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

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

.nodes-table th {
  background: #F8FAFC;
  padding: 1rem 1.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-light);
}

.nodes-table td {
  padding: 1.15rem 1.5rem;
  font-size: 0.9rem;
  border-bottom: 1px solid #F1F5F9;
  vertical-align: middle;
}

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

.nodes-table tr:hover td {
  background: #F8FAFC;
}

.node-name-cell {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.node-flag {
  font-size: 1.25rem;
  line-height: 1;
}

.node-title {
  font-weight: 700;
  color: var(--text-primary);
}

.node-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.node-badge-type {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
}

.badge-iplc {
  background: #EFF6FF;
  color: #1D4ED8;
  border: 1px solid #BFDBFE;
}

.badge-bgp {
  background: #F5F3FF;
  color: #7C3AED;
  border: 1px solid #DDD6FE;
}

.latency-meter {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-weight: 700;
}

.latency-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse 2s infinite;
}

.latency-fast { color: #10B981; }
.latency-normal { color: #F59E0B; }

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

.load-bar-wrap {
  width: 100px;
  height: 6px;
  background: #E2E8F0;
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.25rem;
}

.load-bar-fill {
  height: 100%;
  border-radius: 3px;
}

/* 核心优势板块 */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: all var(--transition-smooth);
  position: relative;
}

.advantage-card:hover {
  transform: translateY(-5px);
  border-color: #93C5FD;
  box-shadow: var(--shadow-lg);
}

.advantage-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: var(--brand-blue-light);
  color: var(--brand-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.advantage-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.advantage-card p {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 套餐价格板块（获取高速连接密钥 / 专属密钥订购） */
.pricing-section {
  background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-smooth);
}

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

.pricing-card.featured {
  border: 2px solid var(--brand-blue);
  box-shadow: 0 10px 35px rgba(29, 78, 216, 0.12);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #1D4ED8 0%, #0284C7 100%);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 8px rgba(29, 78, 216, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.plan-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  min-height: 40px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

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

.price-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
}

.price-period {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.plan-features li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.plan-features li svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

.btn-order-key {
  background: var(--brand-blue-light);
  color: var(--brand-blue) !important;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.9rem 1.5rem;
  border-radius: var(--radius-md);
  text-align: center;
  transition: all var(--transition-fast);
  border: 1px solid #BFDBFE;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-order-key:hover {
  background: var(--brand-blue);
  color: #FFFFFF !important;
}

.pricing-card.featured .btn-order-key {
  background: linear-gradient(135deg, #1D4ED8 0%, #2563EB 100%);
  color: #FFFFFF !important;
  border: none;
  box-shadow: 0 4px 14px rgba(29, 78, 216, 0.35);
}

.pricing-card.featured .btn-order-key:hover {
  background: linear-gradient(135deg, #1E40AF 0%, #1D4ED8 100%);
  box-shadow: 0 6px 20px rgba(29, 78, 216, 0.45);
}

/* 常见问题 FAQ 板块 */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
}

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

.faq-item:hover {
  border-color: #CBD5E1;
}

.faq-question {
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.faq-question svg {
  transition: transform 0.3s ease;
  color: var(--brand-blue);
  flex-shrink: 0;
}

.faq-item.open .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
  padding: 0 1.5rem;
  background: #F8FAFC;
  color: var(--text-secondary);
  font-size: 0.925rem;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  padding: 1.25rem 1.5rem;
  max-height: 350px;
  border-top: 1px solid var(--border-light);
}

/* 知识库与实战教程专区 */
.articles-section {
  background: #FFFFFF;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.article-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.article-card:hover {
  border-color: #93C5FD;
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
  font-size: 0.75rem;
}

.article-tag {
  background: var(--brand-blue-light);
  color: var(--brand-blue);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 700;
}

.article-read-time {
  color: var(--text-muted);
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.article-title a {
  color: var(--text-primary);
}

.article-title a:hover {
  color: var(--brand-blue);
}

.article-excerpt {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid #F1F5F9;
}

.article-read-more {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--brand-blue);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* 用户真实评价板块 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.review-stars {
  color: #F59E0B;
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1rem;
  font-size: 1rem;
}

.review-text {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
  font-style: italic;
}

.review-user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #E2E8F0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--brand-blue);
  font-size: 1rem;
}

.user-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.user-role {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* 页脚样式 */
.site-footer {
  background: #0F172A;
  color: #94A3B8;
  padding: 4rem 0 2rem 0;
  border-top: 1px solid #1E293B;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand h4 {
  color: #FFFFFF;
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  color: #FFFFFF;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: 0.5px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-col a {
  color: #94A3B8;
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid #1E293B;
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
}

/* 单独文章页面专用排版 (Article Page) */
.article-page-header {
  background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
  padding: 3.5rem 0 2.5rem 0;
  border-bottom: 1px solid var(--border-light);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--brand-blue);
}

.article-hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 3.5rem;
  padding: 3.5rem 0;
}

.article-content {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-sm);
  font-size: 1.05rem;
  line-height: 1.85;
  color: #334155;
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: #0F172A;
  margin: 2.25rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #F1F5F9;
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #1E293B;
  margin: 1.75rem 0 0.75rem 0;
}

.article-content p {
  margin-bottom: 1.35rem;
}

.article-content ul, .article-content ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content pre {
  background: #0F172A;
  color: #E2E8F0;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 0.875rem;
  margin: 1.5rem 0;
}

.article-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  background: #F1F5F9;
  color: #0F172A;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
}

.article-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.article-content blockquote {
  border-left: 4px solid var(--brand-blue);
  background: var(--brand-blue-light);
  padding: 1rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
  font-style: italic;
  color: #1E3A8A;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.sidebar-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 90px;
}

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

.sidebar-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sidebar-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.sidebar-links a:hover {
  color: var(--brand-blue);
}

.sidebar-cta-banner {
  background: linear-gradient(135deg, #1D4ED8 0%, #1E40AF 100%);
  color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  margin-top: 1.5rem;
}

.sidebar-cta-banner h4 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.sidebar-cta-banner p {
  font-size: 0.85rem;
  opacity: 0.9;
  margin-bottom: 1rem;
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  .advantages-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .status-summary-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .sidebar-card {
    position: static;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-h1 {
    font-size: 2.25rem;
  }
  .detected-layout {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .platforms-grid {
    grid-template-columns: 1fr;
  }
  .drawer-content-grid {
    grid-template-columns: 1fr;
  }
  .advantages-grid, .articles-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  .status-summary-bar {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}