/* ==========================================================================
   白月光 BYG Cloud — Moonlight Cloud (月光科技) 主题样式库
   规范：浅色科技、柔和玻璃质感、月光白底色、冰蓝与淡紫点缀、手机端优先
   ========================================================================== */

:root {
  /* 品牌核心色彩体系 */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-surface: rgba(255, 255, 255, 0.82);
  --bg-surface-elevated: rgba(255, 255, 255, 0.95);
  --bg-glass-card: rgba(255, 255, 255, 0.72);
  --border-subtle: rgba(226, 232, 240, 0.85);
  --border-accent: rgba(56, 189, 248, 0.35);
  --border-focus: rgba(99, 102, 241, 0.6);

  /* 文字颜色 */
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  /* 品牌点缀色：冰蓝、柔紫、月光金 */
  --color-ice-blue: #0284c7;
  --color-ice-blue-light: #38bdf8;
  --color-ice-blue-subtle: rgba(56, 189, 248, 0.12);
  --color-lavender: #6366f1;
  --color-lavender-light: #818cf8;
  --color-lavender-subtle: rgba(99, 102, 241, 0.1);
  --color-moon-gold: #f59e0b;
  --color-moon-gold-light: #fef3c7;
  --color-emerald: #10b981;
  --color-rose: #f43f5e;

  /* 阴影体系 */
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 20px -2px rgba(14, 165, 233, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 32px -4px rgba(99, 102, 241, 0.12), 0 4px 12px -2px rgba(14, 165, 233, 0.06);
  --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.25);

  /* 布局与圆角 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  --container-max: 1200px;
  --transition-normal: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 全局重置与基础设定 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background: 
    radial-gradient(circle at 15% 10%, rgba(56, 189, 248, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 25%, rgba(129, 140, 248, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(56, 189, 248, 0.05) 0%, transparent 50%),
    var(--bg-primary);
}

a {
  color: var(--color-ice-blue);
  text-decoration: none;
  transition: var(--transition-normal);
}

a:hover {
  color: var(--color-lavender);
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: transparent;
}

/* 容器与辅助类 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section-spacing {
  padding-top: 80px;
  padding-bottom: 80px;
}

@media (max-width: 768px) {
  .section-spacing {
    padding-top: 56px;
    padding-bottom: 56px;
  }
}

.text-center {
  text-align: center;
}

/* 标题徽章与说明 */
.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--color-ice-blue-subtle);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-full);
  color: var(--color-ice-blue);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.3;
}

@media (max-width: 768px) {
  .section-title {
    font-size: 26px;
  }
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 48px;
  line-height: 1.7;
}

/* 按钮体系 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 26px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: var(--transition-normal);
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-ice-blue) 0%, var(--color-lavender) 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(2, 132, 199, 0.35);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.85);
  color: var(--text-main) !important;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: #ffffff;
  border-color: var(--color-ice-blue-light);
  color: var(--color-ice-blue) !important;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 13px;
}

/* 导航栏 (Header) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-normal);
}

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

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

.brand-icon-wrap {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(14, 165, 233, 0.2);
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-icon-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.brand-name-zh {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.5px;
  line-height: 1.1;
}

.brand-name-en {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
}

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

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-ice-blue), var(--color-lavender));
  transition: var(--transition-normal);
  border-radius: var(--radius-full);
}

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

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

.mobile-toggle {
  display: none;
  padding: 8px;
  color: var(--text-main);
  font-size: 24px;
}

@media (max-width: 992px) {
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    background: rgba(241, 245, 249, 0.8);
    border: 1px solid var(--border-subtle);
  }
}

@media (max-width: 640px) {
  .container {
    padding-left: 14px;
    padding-right: 14px;
  }

  .header-container {
    height: 60px;
  }

  .header-actions {
    gap: 6px;
    flex-shrink: 0;
  }

  .header-actions .btn-secondary {
    display: none;
  }

  .header-actions .btn-primary {
    padding: 6px 11px;
    font-size: 12px;
  }

  .mobile-toggle {
    width: 34px;
    height: 34px;
    padding: 4px;
    flex-shrink: 0;
  }

  .brand-icon-wrap {
    width: 32px;
    height: 32px;
  }

  .brand-logo {
    gap: 8px;
    flex-shrink: 0;
  }

  .brand-name-zh {
    font-size: 15px;
  }

  .brand-name-en {
    font-size: 9px;
    letter-spacing: 0.5px;
  }
}

/* Hero 首屏展示 */
.hero-section {
  position: relative;
  padding-top: 50px;
  padding-bottom: 80px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 50px;
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.hero-content {
  max-width: 640px;
}

.hero-brand-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.hero-brand-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-ice-blue);
  box-shadow: 0 0 8px var(--color-ice-blue-light);
}

.hero-main-title {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  color: var(--text-main);
  margin-bottom: 16px;
}

.text-gradient-moon {
  background: linear-gradient(135deg, #0284c7 0%, #6366f1 60%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-ice-blue);
  margin-bottom: 20px;
  line-height: 1.4;
}

.hero-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-meta-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  font-size: 13px;
  color: var(--text-muted);
}

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

.hero-meta-item svg {
  color: var(--color-emerald);
}

/* Hero 右侧月亮视觉与动画 */
.hero-visual-card {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.moon-artwork-container {
  position: relative;
  width: 100%;
  max-width: 420px;
  padding: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  text-align: center;
}

.moon-glow-backdrop {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.35) 0%, rgba(129, 140, 248, 0.2) 50%, transparent 70%);
  border-radius: 50%;
  filter: blur(24px);
  z-index: 0;
  animation: pulseGlow 6s ease-in-out infinite alternate;
}

.moon-logo-frame {
  position: relative;
  z-index: 1;
  width: 240px;
  height: 240px;
  margin: 0 auto 20px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
  animation: floatMoon 4.5s ease-in-out infinite;
}

.moon-logo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.moon-caption {
  position: relative;
  z-index: 1;
}

.moon-caption h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.moon-caption p {
  font-size: 13px;
  color: var(--text-muted);
}

/* 浮动与光晕动画 */
@keyframes floatMoon {
  0% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-10px) rotate(0.8deg);
  }
  100% {
    transform: translateY(0px) rotate(0deg);
  }
}

@keyframes pulseGlow {
  0% {
    transform: translate(-50%, -50%) scale(0.92);
    opacity: 0.6;
  }
  100% {
    transform: translate(-50%, -50%) scale(1.08);
    opacity: 0.95;
  }
}

@media (prefers-reduced-motion: reduce) {
  .moon-glow-backdrop,
  .moon-logo-frame {
    animation: none !important;
  }
  html {
    scroll-behavior: auto !important;
  }
}

/* 栏目三：服务优势 (Features) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-md);
  background: #ffffff;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--color-ice-blue-subtle);
  color: var(--color-ice-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon.lavender {
  background: var(--color-lavender-subtle);
  color: var(--color-lavender);
}

.feature-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.feature-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 栏目四：节点地区 (Regions) */
.regions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

@media (max-width: 992px) {
  .regions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  .regions-grid {
    grid-template-columns: 1fr;
  }
}

.region-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.region-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
  background: #ffffff;
}

.region-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.region-flag-name {
  display: flex;
  align-items: center;
  gap: 10px;
}

.region-flag {
  font-size: 24px;
  line-height: 1;
}

.region-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
}

.region-status-dot {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-emerald);
}

.region-status-dot::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-emerald);
}

.region-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.region-notice-box {
  background: rgba(248, 250, 252, 0.9);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  text-align: center;
}

/* 栏目五：套餐价格 (Pricing Table) */
.pricing-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
}

.tab-btn {
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-normal);
}

.tab-btn:hover {
  color: var(--color-ice-blue);
  border-color: var(--border-accent);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--color-ice-blue) 0%, var(--color-lavender) 100%);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.2);
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

@media (max-width: 992px) {
  .plans-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
}

.plan-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
  backdrop-filter: blur(12px);
}

.plan-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg);
  background: #ffffff;
}

.plan-card.featured {
  border: 2px solid var(--color-ice-blue-light);
  box-shadow: var(--shadow-md);
}

.plan-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-ice-blue) 0%, var(--color-lavender) 100%);
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.25);
  letter-spacing: 0.5px;
}

.plan-header {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.plan-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.plan-status-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: #f1f5f9;
  color: var(--text-muted);
  border: 1px solid #e2e8f0;
  margin-bottom: 14px;
}

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

.plan-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ice-blue);
}

.plan-amount {
  font-size: 40px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

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

.plan-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 10px;
  line-height: 1.6;
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

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

.plan-card .btn {
  width: 100%;
}

.pricing-disclaimer-note {
  margin-top: 36px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 栏目六：新手开始使用 (Onboarding Guide) */
.steps-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

@media (max-width: 992px) {
  .steps-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 580px) {
  .steps-container {
    grid-template-columns: 1fr;
  }
}

.step-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.step-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-ice-blue);
  opacity: 0.85;
  margin-bottom: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--color-ice-blue-subtle);
}

.step-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.step-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 栏目七：六篇原创文章矩阵卡片 (Articles) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

@media (max-width: 992px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
}

.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
  text-decoration: none;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg);
  background: #ffffff;
}

.article-card-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-tag {
  align-self: flex-start;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--color-lavender-subtle);
  color: var(--color-lavender);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 16px;
}

.article-card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
  transition: var(--transition-normal);
}

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

.article-card-excerpt {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 12px;
  color: var(--text-muted);
}

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

.article-card:hover .article-read-btn {
  color: var(--color-lavender);
  transform: translateX(4px);
  transition: var(--transition-normal);
}

/* 栏目八：常见问题 FAQ (至少 10 个真实用户问题) */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: var(--border-accent);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  background: transparent;
  cursor: pointer;
  gap: 16px;
}

.faq-question:hover {
  color: var(--color-ice-blue);
}

.faq-chevron {
  transition: transform 0.25s ease;
  flex-shrink: 0;
  color: var(--text-muted);
}

.faq-item.is-active .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-ice-blue);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
  padding: 0 24px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-item.is-active .faq-answer {
  padding-bottom: 24px;
  max-height: 500px;
}

/* 栏目九：关于白月光 (About) */
.about-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

@media (max-width: 860px) {
  .about-box {
    grid-template-columns: 1fr;
    padding: 32px 24px;
  }
}

.about-content h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

.about-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about-stat-item {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.about-stat-num {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-ice-blue);
  margin-bottom: 4px;
}

.about-stat-label {
  font-size: 12px;
  color: var(--text-muted);
}

/* 栏目十：页脚 (Footer) */
.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-subtle);
  padding-top: 60px;
  padding-bottom: 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

@media (max-width: 860px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 18px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

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

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* 交互模态弹窗 (用于“注册入口即将开放”温馨提醒) */
.notice-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}

.notice-modal-backdrop.is-visible {
  opacity: 1;
  visibility: visible;
}

.notice-modal {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  max-width: 480px;
  width: 100%;
  padding: 36px 32px;
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.15);
  text-align: center;
  transform: scale(0.95);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.notice-modal-backdrop.is-visible .notice-modal {
  transform: scale(1);
}

.modal-icon-wrap {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--color-ice-blue-subtle);
  color: var(--color-ice-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.modal-body {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
}

.modal-footer {
  display: flex;
  justify-content: center;
  gap: 12px;
}