/* ==========================================================================
   杏花云 (Xinghua Cloud) - 核心样式表
   风格：Warm Organic Frosted Glassmorphism & Soft Flora Hue
   配色：霜白雪花石 (#F8F9FA) / 深邃午夜蓝 (#0B0F19) / 暖杏花甘露 (#FF8E72) / 尤加利灰 (#64748B)
   特性：纯原生 CSS、零外部库依赖、秒开极速加载、昼夜主题切换、响应式媒体查询
   ========================================================================== */

/* --- CSS 变量系统 (默认白天/浅色模式，支持切换为暗夜/深色模式) --- */
:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  /* 默认白天浅色主题 (Frosted Cream Alabaster & Warm Apricot Nectar) */
  --bg-primary: #FAF8F5;
  --bg-secondary: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #FFFFFF;
  --bg-nav: rgba(250, 248, 245, 0.92);
  --bg-glass: rgba(255, 142, 114, 0.04);
  --bg-input: #F3EFEA;
  
  --border-color: rgba(214, 203, 193, 0.35);
  --border-hover: rgba(255, 142, 114, 0.45);
  --border-glow: rgba(255, 142, 114, 0.3);
  
  --text-primary: #1C2331;
  --text-secondary: #64748B; /* 尤加利灰 */
  --text-muted: #8E9BAE;
  
  /* 暖杏花色彩矩阵 */
  --accent-primary: #FF8E72;
  --accent-secondary: #FF7854;
  --accent-deep: #E06044;
  --accent-soft: rgba(255, 142, 114, 0.12);
  --accent-green: #10B981;
  --accent-amber: #F59E0B;
  --accent-blue: #3B82F6;
  
  --gradient-brand: linear-gradient(135deg, #FF8E72 0%, #FF7052 50%, #E85D04 100%);
  --gradient-warm-soft: linear-gradient(135deg, rgba(255, 142, 114, 0.15) 0%, rgba(255, 237, 213, 0.3) 100%);
  --gradient-subtle: linear-gradient(180deg, rgba(255, 142, 114, 0.06) 0%, rgba(250, 248, 245, 0) 100%);
  --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.95) 0%, rgba(254, 243, 238, 0.6) 100%);
  
  --shadow-sm: 0 4px 12px rgba(224, 96, 68, 0.06);
  --shadow-md: 0 10px 30px rgba(28, 35, 49, 0.06);
  --shadow-lg: 0 18px 45px rgba(28, 35, 49, 0.1);
  --shadow-glow: 0 0 35px rgba(255, 142, 114, 0.28);
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --container-width: 1200px;
}

/* 浅色主题显式标记 */
[data-theme="light"] {
  --bg-primary: #FAF8F5;
  --bg-secondary: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #FFFFFF;
  --bg-nav: rgba(250, 248, 245, 0.92);
  --bg-glass: rgba(255, 142, 114, 0.04);
  --bg-input: #F3EFEA;
  
  --border-color: rgba(214, 203, 193, 0.35);
  --border-hover: rgba(255, 142, 114, 0.45);
  --border-glow: rgba(255, 142, 114, 0.3);
  
  --text-primary: #1C2331;
  --text-secondary: #64748B;
  --text-muted: #8E9BAE;
  
  --shadow-sm: 0 4px 12px rgba(224, 96, 68, 0.06);
  --shadow-md: 0 10px 30px rgba(28, 35, 49, 0.06);
  --shadow-lg: 0 18px 45px rgba(28, 35, 49, 0.1);
}

/* 深色主题 (Deep Midnight Navy 模式) */
[data-theme="dark"] {
  --bg-primary: #0B0F19;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.78);
  --bg-card-hover: rgba(26, 36, 56, 0.92);
  --bg-nav: rgba(11, 15, 25, 0.88);
  --bg-glass: rgba(255, 142, 114, 0.05);
  --bg-input: #172033;
  
  --border-color: rgba(255, 255, 255, 0.09);
  --border-hover: rgba(255, 142, 114, 0.4);
  --border-glow: rgba(255, 142, 114, 0.3);
  
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  --gradient-subtle: linear-gradient(180deg, rgba(255, 142, 114, 0.08) 0%, rgba(11, 15, 25, 0) 100%);
  --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 45px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 35px rgba(255, 142, 114, 0.35);
}

/* --- 全局重置与平滑滚动 --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

/* 锚点防遮挡偏移量 (对应 72px 顶栏高度 + 14px 留白) */
[id] {
  scroll-margin-top: 86px;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

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

img, svg {
  vertical-align: middle;
}

ul, ol {
  list-style: none;
}

button, input {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

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

/* --- 背景暖意有机流体微光特效 (Warm Organic Fluids) --- */
.bg-ambient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.ambient-blob-1 {
  position: absolute;
  top: -15%;
  left: 15%;
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(255, 142, 114, 0.18) 0%, rgba(255, 142, 114, 0) 70%);
  filter: blur(80px);
  border-radius: 50%;
  animation: floatWarmOrb 22s infinite alternate ease-in-out;
}

.ambient-blob-2 {
  position: absolute;
  top: 45%;
  right: -5%;
  width: 580px;
  height: 580px;
  background: radial-gradient(circle, rgba(255, 112, 82, 0.12) 0%, rgba(255, 237, 213, 0) 70%);
  filter: blur(90px);
  border-radius: 50%;
  animation: floatWarmOrb 28s infinite alternate-reverse ease-in-out;
}

@keyframes floatWarmOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, 40px) scale(1.1); }
  100% { transform: translate(-40px, -30px) scale(0.92); }
}

/* --- 顶部导航栏 --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-nav);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon-box {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(255, 142, 114, 0.4);
  color: #FFFFFF;
}

.brand-text-main {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

.brand-tag {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--accent-soft);
  color: var(--accent-primary);
  border: 1px solid rgba(255, 142, 114, 0.3);
  font-weight: 600;
  margin-left: 6px;
}

/* 导航链接列表 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-item {
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  white-space: nowrap;
}

.nav-item:hover {
  color: var(--accent-primary);
}

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

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

/* 推荐资讯特别高亮入口 */
.nav-item-highlight {
  color: var(--accent-deep);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--accent-soft);
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 142, 114, 0.35);
  transition: all var(--transition-fast);
}

.nav-item-highlight:hover {
  background: var(--accent-primary);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.nav-badge-new {
  font-size: 0.68rem;
  background: var(--accent-primary);
  color: #FFFFFF;
  padding: 1px 5px;
  border-radius: var(--radius-full);
  font-weight: 800;
  letter-spacing: 0.05em;
}

.nav-item-highlight:hover .nav-badge-new {
  background: #FFFFFF;
  color: var(--accent-primary);
}

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

/* --- 精致半透明磨砂昼夜切换按钮 --- */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.theme-icon-sun,
.theme-icon-moon {
  position: absolute;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
}

/* 默认白天浅色模式：显示月亮图标（提示点击切换为夜间） */
.theme-icon-sun {
  transform: rotate(-90deg) scale(0.2);
  opacity: 0;
}
.theme-icon-moon {
  transform: rotate(0deg) scale(1);
  opacity: 1;
}

/* 深色模式：显示太阳图标（提示点击切换为白天） */
[data-theme="dark"] .theme-icon-sun {
  transform: rotate(0deg) scale(1);
  opacity: 1;
}
[data-theme="dark"] .theme-icon-moon {
  transform: rotate(90deg) scale(0.2);
  opacity: 0;
}

/* 浅色模式显式标记 */
[data-theme="light"] .theme-icon-sun {
  transform: rotate(-90deg) scale(0.2);
  opacity: 0;
}
[data-theme="light"] .theme-icon-moon {
  transform: rotate(0deg) scale(1);
  opacity: 1;
}

/* --- CTA 按钮体系 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-md);
  padding: 12px 24px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
  text-decoration: none;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-primary {
  background: var(--gradient-brand);
  color: #FFFFFF;
  box-shadow: 0 4px 18px rgba(255, 142, 114, 0.45);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.28), transparent);
  transition: left 0.6s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(255, 112, 82, 0.6);
  color: #FFFFFF;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  color: var(--text-primary);
}

.btn-pulse {
  animation: pulseApricot 3s infinite ease-in-out;
}

@keyframes pulseApricot {
  0%, 100% { box-shadow: 0 4px 18px rgba(255, 142, 114, 0.45); }
  50% { box-shadow: 0 4px 30px rgba(232, 93, 4, 0.65); }
}

/* --- Hero 主视觉区 --- */
.hero-section {
  padding: 85px 0 60px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: var(--accent-soft);
  border: 1px solid rgba(255, 142, 114, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  color: var(--text-primary);
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero-pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 10px var(--accent-green);
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  max-width: 980px;
  margin: 0 auto 20px;
}

.hero-gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline;
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 45px;
}

/* --- 交互式测速组件 (Interactive Speed Demo Widget) --- */
.speed-test-section {
  margin: 40px auto 60px;
  max-width: 740px;
}

.speed-test-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.speed-test-card:hover {
  border-color: var(--border-hover);
}

.speed-test-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.speed-test-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: var(--bg-glass);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.speed-test-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-amber);
  transition: background-color 0.4s ease;
}

.speed-test-badge-dot.active {
  background: var(--accent-green);
  box-shadow: 0 0 10px var(--accent-green);
}

.speed-dial-center {
  margin: 20px auto 28px;
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 170px;
  height: 170px;
  border-radius: 50%;
  background: var(--gradient-warm-soft);
  border: 2px dashed rgba(255, 142, 114, 0.4);
  transition: all 0.5s ease;
}

.speed-dial-center.testing {
  border-style: solid;
  border-color: var(--accent-primary);
  animation: rotateBorder 4s linear infinite;
}

@keyframes rotateBorder {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.speed-dial-number {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  color: var(--accent-deep);
  letter-spacing: -0.02em;
}

.speed-dial-unit {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 600;
}

.speed-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 26px;
}

.speed-metric-item {
  padding: 14px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.speed-metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.speed-metric-val {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.text-green {
  color: var(--accent-green);
}

/* --- Section 通用排版 --- */
.section {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-deep);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* --- Bento 便当盒核心优势卡片 (Bento Feature Modules) --- */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  backdrop-filter: blur(14px);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.bento-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

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

.bento-icon-box {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-deep);
  margin-bottom: 24px;
  border: 1px solid rgba(255, 142, 114, 0.3);
}

.bento-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.bento-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
}

.bento-list {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.bento-list-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.bento-list-item svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

/* --- 流媒体与 AI 支持图卡展示 --- */
.showcase-block {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 36px;
  backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
}

.showcase-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 16px;
}

.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--accent-soft);
  border: 1px solid rgba(255, 142, 114, 0.35);
  border-radius: var(--radius-full);
  color: var(--accent-deep);
  font-size: 0.85rem;
  font-weight: 700;
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.service-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  text-align: center;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.service-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.service-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.service-name {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 4px;
}

.service-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* --- 弹性带宽计算滑块 (Sliding Plan Selector) --- */
.plan-slider-box {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  margin-bottom: 48px;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-md);
}

.plan-slider-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.plan-slider-title {
  font-size: 1.45rem;
  font-weight: 700;
}

.plan-slider-subtitle {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.plan-slider-result {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.plan-slider-price {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--accent-deep);
  line-height: 1;
}

.plan-slider-cycle {
  font-size: 1rem;
  color: var(--text-muted);
}

.slider-control-wrap {
  margin-bottom: 24px;
}

.plan-range-input {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--border-color);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.plan-range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gradient-brand);
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(255, 142, 114, 0.6);
  border: 2px solid #FFFFFF;
  transition: transform 0.15s ease;
}

.plan-range-input::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.plan-slider-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

.plan-slider-chip {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.plan-slider-chip strong {
  color: var(--text-primary);
}

/* --- 套餐价格对比表 (Pricing) --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  backdrop-filter: blur(14px);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
}

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

.pricing-popular {
  border-color: var(--accent-primary);
  box-shadow: 0 0 30px rgba(255, 142, 114, 0.25);
  transform: scale(1.03);
}

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

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(255, 142, 114, 0.4);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.pricing-tier {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.pricing-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  min-height: 42px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-deep);
}

.price-amount {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.pricing-divider {
  height: 1px;
  background: var(--border-color);
  margin-bottom: 24px;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
  flex-grow: 1;
}

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

.pricing-feature-item svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

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

/* --- 用户评价 (Testimonials) --- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #F59E0B;
  margin-bottom: 16px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #FFFFFF;
  font-size: 0.95rem;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
}

.author-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- 常见问题 (FAQ Accordion) --- */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

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

.faq-item.active {
  border-color: var(--border-glow);
}

.faq-question {
  width: 100%;
  padding: 22px 24px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-primary);
}

.faq-icon {
  width: 22px;
  height: 22px;
  transition: transform var(--transition-normal);
  color: var(--text-muted);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--accent-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--bg-glass);
}

.faq-answer-inner {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- 底部横幅 CTA Banner --- */
.cta-banner {
  background: linear-gradient(135deg, rgba(255, 142, 114, 0.16) 0%, rgba(255, 112, 82, 0.1) 100%);
  border: 1px solid rgba(255, 142, 114, 0.35);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  margin: 40px 0 80px;
  position: relative;
  overflow: hidden;
}

.cta-banner-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 30px;
}

/* --- 页脚 (严格遵守只保留四个标题规范) --- */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  padding: 40px 0 32px;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- 文章与资讯中心通用版式 (Insights & Article System) --- */
.page-hero {
  padding: 70px 0 40px;
  text-align: center;
  background: var(--gradient-subtle);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 40px;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.page-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

.content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 44px;
  margin-bottom: 60px;
  backdrop-filter: blur(12px);
  line-height: 1.8;
}

.content-box h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.content-box h2:first-child {
  margin-top: 0;
}

.content-box h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 22px 0 12px;
  color: var(--text-primary);
}

.content-box p {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.content-box ul {
  margin: 0 0 20px 24px;
  list-style: disc;
}

.content-box li {
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.content-highlight-box {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent-primary);
  padding: 18px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
}

.content-highlight-box p {
  margin-bottom: 0;
  color: var(--text-primary);
  font-weight: 500;
}

/* 资讯中心专有文章栅格 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 30px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.article-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.45;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

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

.article-link {
  color: var(--accent-deep);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

/* 文章目录 Table of Contents (TOC) */
.article-toc {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin-bottom: 32px;
}

.article-toc-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-toc-list a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  transition: color var(--transition-fast);
}

.article-toc-list a:hover {
  color: var(--accent-deep);
  padding-left: 4px;
}

/* 文章相关阅读模块 */
.related-box {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.related-box h3 {
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-link-card {
  padding: 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: block;
}

.related-link-card:hover {
  border-color: var(--border-hover);
  transform: translateX(4px);
}

.related-link-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.related-link-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 网站地图专用栅格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.15rem;
  margin-bottom: 14px;
  color: var(--accent-deep);
}

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

.sitemap-links a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sitemap-links a:hover {
  color: var(--text-primary);
  transform: translateX(4px);
}

/* --- 移动端响应式媒体查询 (@media) --- */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .bento-grid,
  .pricing-grid,
  .reviews-grid,
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .showcase-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
  }
  .nav-inner {
    height: 64px;
  }
  
  .nav-links {
    display: none;
  }
  
  .hero-section {
    padding: 50px 0 40px;
  }
  
  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }
  
  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: 28px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  
  .hero-cta-group .btn {
    width: 100%;
  }
  
  .speed-test-card {
    padding: 24px 18px;
  }
  
  .speed-metrics-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  
  .bento-grid,
  .pricing-grid,
  .reviews-grid,
  .articles-grid,
  .sitemap-grid,
  .related-links {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .pricing-popular {
    transform: none;
  }
  .pricing-popular:hover {
    transform: translateY(-4px);
  }
  
  .showcase-block {
    padding: 24px 18px;
  }
  
  .showcase-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  
  .plan-slider-box {
    padding: 24px 18px;
  }
  
  .plan-slider-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .section {
    padding: 55px 0;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .cta-banner {
    padding: 36px 20px;
    margin: 20px 0 50px;
  }
  
  .cta-banner-title {
    font-size: 1.65rem;
  }
  
  .footer-nav {
    gap: 18px;
    flex-direction: row;
    justify-content: space-around;
  }
  
  .content-box {
    padding: 24px 18px;
  }
  
  .page-title {
    font-size: 1.9rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .brand-logo {
    font-size: 1.1rem;
  }
  .brand-icon-box {
    width: 34px;
    height: 34px;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .showcase-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
}