/* ==========================================================================
   银河云 (Galaxy Cloud) - 天体物理引力透镜 UI 核心样式表
   Astrophysical Gravitational-Lensing UI Architecture
   Palette: Deep cosmological canvas (#030508), Core starlight white (#ffffff),
            Pulsar violet (#8b5cf6), Deep nebula cyan (#06b6d4)
   ========================================================================== */

/* ---------------- CSS 变量定义与主题配色 ---------------- */
:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Roboto Mono", Consolas, monospace;

  /* 天体物理配色：深色夜间模式 (默认宇宙画布) */
  --bg-cosmos: #030508;
  --bg-primary: #050811;
  --bg-secondary: #080d1a;
  --bg-card: rgba(10, 16, 31, 0.78);
  --bg-card-hover: rgba(18, 28, 54, 0.88);
  --bg-glass: rgba(5, 8, 17, 0.82);
  --bg-badge: rgba(139, 92, 246, 0.16);

  --border-color: rgba(139, 92, 246, 0.22);
  --border-cyan: rgba(6, 182, 212, 0.28);
  --border-light: rgba(255, 255, 255, 0.08);
  --border-focus: #8b5cf6;

  --text-primary: #ffffff;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --text-astronomy: #38bdf8;
  --badge-text: #c4b5fd;

  --starlight-white: #ffffff;
  --pulsar-violet: #8b5cf6;
  --nebula-cyan: #06b6d4;
  --singularity-pink: #ec4899;

  --brand-gradient: linear-gradient(135deg, #ffffff 0%, #8b5cf6 50%, #06b6d4 100%);
  --brand-gradient-hover: linear-gradient(135deg, #f8fafc 0%, #a855f7 50%, #22d3ee 100%);
  --warp-gradient: linear-gradient(90deg, rgba(139,92,246,0) 0%, rgba(6,182,212,0.8) 50%, rgba(139,92,246,0) 100%);

  --glow-core: rgba(255, 255, 255, 0.25);
  --glow-pulsar: rgba(139, 92, 246, 0.35);
  --glow-cyan: rgba(6, 182, 212, 0.3);

  --card-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.8), 0 0 20px rgba(139, 92, 246, 0.12);
  --card-shadow-hover: 0 20px 40px -10px rgba(0, 0, 0, 0.9), 0 0 35px rgba(6, 182, 212, 0.3);
  --header-shadow: 0 4px 24px rgba(0, 0, 0, 0.7);

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

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
}

/* 白昼星图模式 (白天模式，优雅高能物理实验室基底) */
[data-theme="light"] {
  --bg-cosmos: #f4f6fb;
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --bg-badge: #eef2ff;

  --border-color: rgba(139, 92, 246, 0.2);
  --border-cyan: rgba(6, 182, 212, 0.25);
  --border-light: #e2e8f0;
  --border-focus: #7c3aed;

  --text-primary: #0a0f1d;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-astronomy: #0284c7;
  --badge-text: #6d28d9;

  --starlight-white: #0a0f1d;
  --pulsar-violet: #6d28d9;
  --nebula-cyan: #0891b2;

  --brand-gradient: linear-gradient(135deg, #0a0f1d 0%, #6d28d9 50%, #0891b2 100%);
  --brand-gradient-hover: linear-gradient(135deg, #1e293b 0%, #5b21b6 50%, #0e7490 100%);

  --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 0 15px rgba(109, 40, 217, 0.06);
  --card-shadow-hover: 0 20px 35px -10px rgba(15, 23, 42, 0.15), 0 0 25px rgba(8, 145, 178, 0.15);
  --header-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-cosmos);
  color: var(--text-primary);
  line-height: 1.65;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 锚点滚动距离顶部留白 (避免被吸顶导航遮挡) */
section[id], div[id] {
  scroll-margin-top: 86px;
}

/* ---------------- 天体引力互动 Canvas 画布 ---------------- */
#galaxyCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: auto; /* 接收光标引力交互 */
}

/* 宇宙星系刻度与坐标辅助背景标尺 (纯CSS视觉) */
.astro-grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  background-image: 
    radial-gradient(circle at 50% 50%, transparent 65%, rgba(3, 5, 8, 0.85) 100%),
    linear-gradient(rgba(139, 92, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6, 182, 212, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 80px 80px, 80px 80px;
}

[data-theme="light"] .astro-grid-overlay {
  background-image: 
    radial-gradient(circle at 50% 50%, transparent 70%, rgba(244, 246, 251, 0.8) 100%),
    linear-gradient(rgba(109, 40, 217, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 145, 178, 0.03) 1px, transparent 1px);
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

a {
  color: inherit;
  text-decoration: none;
}

img, svg {
  vertical-align: middle;
}

/* ---------------- 天文坐标标尺微组件 (Astronomical HUD Brackets) ---------------- */
.astro-bracket {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 1px;
  color: var(--text-astronomy);
  padding: 4px 12px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-sm);
  position: relative;
  text-transform: uppercase;
}

.astro-bracket::before {
  content: "[";
  color: var(--pulsar-violet);
  font-weight: 700;
}
.astro-bracket::after {
  content: "]";
  color: var(--pulsar-violet);
  font-weight: 700;
}

/* ---------------- 顶部导航栏 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--header-shadow);
  transition: var(--transition);
}

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

/* 品牌 Logo 区 */
.logo-area {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.logo-area:hover {
  transform: scale(1.02);
  opacity: 0.95;
}

.site-logo-img {
  height: 38px;
  width: auto;
  max-width: 180px;
  object-fit: contain;
  vertical-align: middle;
}

.site-logo-img.logo-light {
  display: none;
}
.site-logo-img.logo-dark {
  display: block;
}

[data-theme="light"] .site-logo-img.logo-light {
  display: block;
}
[data-theme="light"] .site-logo-img.logo-dark {
  display: none;
}

.brand-tag-badge {
  font-size: 0.76rem;
  font-weight: 700;
  padding: 3px 8px;
  background: var(--bg-badge);
  color: var(--badge-text);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  letter-spacing: 0.6px;
  white-space: nowrap;
}

/* 导航链接目录 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.92rem;
  transition: color 0.2s ease, text-shadow 0.2s ease;
  position: relative;
  padding: 6px 0;
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--text-primary);
  text-shadow: 0 0 12px var(--pulsar-violet);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--brand-gradient);
  border-radius: 2px;
  transition: width 0.25s ease;
}

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

/* 导航中新增的【推荐资讯】专属高亮徽章微样式 */
.nav-badge-new {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 4px;
  background: linear-gradient(135deg, #ec4899, #8b5cf6);
  color: #ffffff;
  font-weight: 700;
  margin-left: 4px;
  vertical-align: middle;
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.85; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}

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

/* 昼夜切换按钮 (精致透明高质感) */
.theme-toggle-btn {
  background: rgba(139, 92, 246, 0.08);
  border: 1px solid var(--border-color);
  padding: 7px 14px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--text-secondary);
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.theme-toggle-btn:hover {
  background: rgba(6, 182, 212, 0.15);
  border-color: var(--nebula-cyan);
  color: var(--text-primary);
  transform: translateY(-1px);
  box-shadow: 0 0 15px var(--glow-cyan);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.icon-sun { display: none; }
.icon-moon { display: inline-block; }

[data-theme="light"] .icon-sun { display: inline-block; }
[data-theme="light"] .icon-moon { display: none; }

.theme-mode-label {
  font-size: 0.82rem;
  font-weight: 600;
}

/* 按钮规范系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  line-height: 1;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--brand-gradient);
  color: #ffffff !important;
  box-shadow: 0 4px 20px var(--glow-pulsar);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  box-shadow: 0 8px 30px var(--glow-cyan);
  transform: translateY(-2px);
  filter: brightness(1.1);
}

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

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--nebula-cyan);
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
}

.btn-white {
  background: #ffffff;
  color: #0a0f1d !important;
  font-weight: 700;
  box-shadow: 0 6px 24px rgba(255, 255, 255, 0.35);
  border: none;
}

.btn-white:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 10px 35px rgba(6, 182, 212, 0.5);
}

.btn-sm { padding: 8px 16px; font-size: 0.86rem; }
.btn-md { padding: 12px 24px; font-size: 0.96rem; }
.btn-lg { padding: 15px 32px; font-size: 1.08rem; letter-spacing: 0.4px; }
.btn-full { width: 100%; }

/* ---------------- 主视觉区 (Hero Section - 天体物理引力透镜) ---------------- */
.hero-section {
  padding: 85px 0 70px;
  text-align: center;
  position: relative;
  z-index: 2;
}

.hero-astronomy-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-badge);
  color: var(--badge-text);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.15);
}

.hero-pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--nebula-cyan);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(6, 182, 212, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(6, 182, 212, 0); }
}

.hero-headline {
  font-size: clamp(2.3rem, 5.5vw, 4.1rem);
  font-weight: 900;
  line-height: 1.18;
  margin-bottom: 20px;
  letter-spacing: -1.2px;
}

.brand-title-lead {
  background: linear-gradient(135deg, #ffffff 10%, #a855f7 60%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .brand-title-lead {
  background: linear-gradient(135deg, #090e1a 10%, #6d28d9 60%, #0891b2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  font-weight: 600;
  color: var(--text-astronomy);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

/* 主视觉区核心简介段落 */
.hero-introduction {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 840px;
  margin: 0 auto 36px;
  line-height: 1.8;
  padding: 0 10px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

/* 天体引力透镜交互指引贴士 */
.galaxy-canvas-hint {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 36px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.03);
  border: 1px dashed var(--border-color);
}

.galaxy-canvas-hint svg {
  animation: float-pointer 2s ease-in-out infinite;
  color: var(--nebula-cyan);
}

@keyframes float-pointer {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1040px;
  margin: 0 auto;
  padding: 30px 20px 0;
  border-top: 1px solid var(--border-color);
}

.stat-item {
  padding: 10px;
  position: relative;
}

.stat-number {
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 4px;
  font-family: var(--font-mono);
  letter-spacing: -0.5px;
}

.stat-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ---------------- 通用 Section 样式 ---------------- */
.section {
  padding: 85px 0;
  position: relative;
  z-index: 2;
}

.section-alt {
  background: rgba(8, 13, 26, 0.6);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
}

[data-theme="light"] .section-alt {
  background: rgba(241, 245, 249, 0.8);
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--nebula-cyan);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.9rem, 3.8vw, 2.6rem);
  font-weight: 900;
  margin-bottom: 16px;
  letter-spacing: -0.8px;
}

.section-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ---------------- 3个产品核心优势卡片 ---------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--pulsar-violet), var(--nebula-cyan));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--nebula-cyan);
}

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

.feature-icon-box {
  width: 62px;
  height: 62px;
  border-radius: var(--radius-md);
  background: var(--bg-badge);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--nebula-cyan);
  border: 1px solid var(--border-color);
}

.feature-icon-box svg {
  width: 32px;
  height: 32px;
}

.feature-title {
  font-size: 1.38rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.feature-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.feature-pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 4px 10px;
  background: rgba(139, 92, 246, 0.08);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--badge-text);
  font-weight: 500;
}

/* ---------------- 应用专区 (流媒体图卡 & AI 支持图卡) ---------------- */
.specialty-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(16px);
  position: relative;
}

.showcase-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--nebula-cyan);
}

.showcase-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 5px 14px;
  background: var(--bg-badge);
  color: var(--badge-text);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 18px;
  border: 1px solid var(--border-color);
}

.showcase-title {
  font-size: 1.65rem;
  font-weight: 800;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.showcase-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 28px;
}

.service-tags-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.service-tag-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(3, 5, 8, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

[data-theme="light"] .service-tag-item {
  background: #f8fafc;
}

.service-tag-item:hover {
  border-color: var(--nebula-cyan);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.service-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.service-logo-box {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.75rem;
  color: #fff;
}

.logo-netflix { background: #E50914; }
.logo-disney { background: #113CCF; }
.logo-youtube { background: #FF0000; }
.logo-spotify { background: #1DB954; }
.logo-chatgpt { background: #10A37F; }
.logo-claude { background: #D97706; }
.logo-midjourney { background: #2E1065; }
.logo-gemini { background: #2563EB; }

.service-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

.service-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.76rem;
  color: #10b981;
  font-weight: 600;
  background: rgba(16, 185, 129, 0.12);
  padding: 3px 8px;
  border-radius: var(--radius-full);
}

.status-dot {
  width: 6px;
  height: 6px;
  background-color: #10b981;
  border-radius: 50%;
}

.showcase-footer-metric {
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.metric-value {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--nebula-cyan);
}

/* ---------------- 套餐价格对比表 (参考网上真实价格标准) ---------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  backdrop-filter: blur(16px);
}

.pricing-card.featured {
  border-color: var(--nebula-cyan);
  box-shadow: 0 15px 40px -5px rgba(6, 182, 212, 0.35);
  transform: scale(1.02);
  z-index: 2;
  background: rgba(15, 23, 42, 0.88);
}

[data-theme="light"] .pricing-card.featured {
  background: #ffffff;
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #06b6d4 100%);
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.8px;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
  white-space: nowrap;
}

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

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  min-height: 44px;
  line-height: 1.6;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 22px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--nebula-cyan);
}

.price {
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

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

.plan-features-list {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.check-icon {
  width: 17px;
  height: 17px;
  color: #10b981;
  flex-shrink: 0;
}

/* ---------------- 用户评价 ---------------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(16px);
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--nebula-cyan);
}

.stars-rating {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 16px;
}

.stars-rating svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.testimonial-text {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
  flex-grow: 1;
  font-style: italic;
}

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

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--pulsar-violet), var(--nebula-cyan));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.05rem;
}

.user-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
}

.user-role {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ---------------- 常见问题 (FAQ 手风琴) ---------------- */
.faq-wrap {
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

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

.faq-question {
  width: 100%;
  padding: 22px 24px;
  background: transparent;
  border: none;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: color 0.2s ease;
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--nebula-cyan);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 350px;
  padding-bottom: 22px;
}

/* ---------------- 底栏转化 Banner ---------------- */
.cta-banner-section {
  padding: 80px 0;
  position: relative;
  z-index: 2;
}

.cta-banner-card {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.8) 0%, rgba(6, 182, 212, 0.8) 100%);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  color: #ffffff;
  box-shadow: 0 25px 50px -10px rgba(6, 182, 212, 0.4);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.cta-banner-title {
  font-size: clamp(2rem, 3.8vw, 2.7rem);
  font-weight: 900;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.cta-banner-desc {
  font-size: 1.12rem;
  max-width: 650px;
  margin: 0 auto 34px;
  opacity: 0.95;
  line-height: 1.7;
}

/* ---------------- 页脚 (严格只保留四个指定标题链接) ---------------- */
.site-footer {
  background: rgba(3, 5, 8, 0.92);
  border-top: 1px solid var(--border-color);
  padding: 50px 0 35px;
  position: relative;
  z-index: 10;
  backdrop-filter: blur(20px);
}

[data-theme="light"] .site-footer {
  background: #ffffff;
}

.footer-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  list-style: none;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-nav-item a {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

.footer-nav-item a:hover {
  color: var(--nebula-cyan);
  background: rgba(6, 182, 212, 0.1);
  transform: translateY(-1px);
}

.footer-divider {
  max-width: 600px;
  margin: 0 auto 24px;
  height: 1px;
  background: var(--border-color);
}

.footer-bottom {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-brand-tag {
  font-weight: 700;
  color: var(--text-secondary);
}

/* ---------------- 子页面内容通用排版 ---------------- */
.subpage-hero {
  padding: 65px 0 45px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: rgba(8, 13, 26, 0.7);
  backdrop-filter: blur(12px);
  position: relative;
  z-index: 2;
}

[data-theme="light"] .subpage-hero {
  background: rgba(241, 245, 249, 0.85);
}

.subpage-content-wrap {
  max-width: 880px;
  margin: 50px auto 80px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(16px);
  position: relative;
  z-index: 2;
}

.subpage-content-wrap h2 {
  font-size: 1.65rem;
  font-weight: 800;
  margin: 38px 0 16px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.subpage-content-wrap h2:first-of-type {
  margin-top: 0;
}

.subpage-content-wrap h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 24px 0 12px;
  color: var(--text-primary);
}

.subpage-content-wrap p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.85;
  margin-bottom: 16px;
}

.subpage-content-wrap ul, .subpage-content-wrap ol {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.85;
  padding-left: 24px;
  margin-bottom: 20px;
}

.subpage-content-wrap li {
  margin-bottom: 8px;
}

.alert-box {
  padding: 18px 22px;
  border-radius: var(--radius-md);
  margin: 24px 0;
  font-size: 0.96rem;
  line-height: 1.75;
}

.alert-info {
  background: rgba(6, 182, 212, 0.1);
  border-left: 4px solid var(--nebula-cyan);
  color: var(--text-primary);
}

.alert-warning {
  background: rgba(239, 68, 68, 0.1);
  border-left: 4px solid #ef4444;
  color: var(--text-primary);
}

/* 资讯文章卡片流 */
.article-item-card {
  padding: 30px;
  border-radius: var(--radius-md);
  background: rgba(3, 5, 8, 0.45);
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
  transition: var(--transition);
}

[data-theme="light"] .article-item-card {
  background: #f8fafc;
}

.article-item-card:hover {
  border-color: var(--nebula-cyan);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(6, 182, 212, 0.15);
}

.article-meta-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(139, 92, 246, 0.15);
  color: var(--badge-text);
  margin-bottom: 12px;
  border: 1px solid var(--border-color);
}

.article-item-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.article-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* ---------------- 深度 SEO 科普文章专属排版体系 ---------------- */
/* 面包屑导航 */
.breadcrumb-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb-wrap a {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.breadcrumb-wrap a:hover {
  color: var(--nebula-cyan);
}

.breadcrumb-sep {
  color: var(--border-color);
}

.breadcrumb-current {
  color: var(--text-astronomy);
  font-weight: 600;
}

/* 文章详情容器 */
.article-detail-wrap {
  max-width: 900px;
  margin: 40px auto 80px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 50px 45px;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(20px);
  position: relative;
  z-index: 2;
}

.article-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

.article-title-main {
  font-size: clamp(1.8rem, 3.4vw, 2.45rem);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 18px;
  letter-spacing: -0.6px;
  color: var(--text-primary);
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-header-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 文章目录 (Table of Contents) */
.article-toc {
  background: rgba(3, 5, 8, 0.45);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--pulsar-violet);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 32px 0 40px;
}

[data-theme="light"] .article-toc {
  background: #f8fafc;
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-list li {
  font-size: 0.95rem;
  padding-left: 12px;
  position: relative;
}

.toc-list li::before {
  content: "•";
  color: var(--nebula-cyan);
  position: absolute;
  left: 0;
  font-weight: bold;
}

.toc-list a {
  color: var(--text-secondary);
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.toc-list a:hover {
  color: var(--nebula-cyan);
  transform: translateX(4px);
}

/* 正文深度排版 */
.article-body-content {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.88;
}

.article-body-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  scroll-margin-top: 90px;
}

.article-body-content h2:first-of-type {
  margin-top: 10px;
}

.article-body-content h3 {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 14px;
  scroll-margin-top: 90px;
}

.article-body-content p {
  margin-bottom: 20px;
}

.article-body-content ul,
.article-body-content ol {
  padding-left: 24px;
  margin-bottom: 24px;
}

.article-body-content li {
  margin-bottom: 8px;
}

.article-body-content strong {
  color: var(--text-primary);
}

.article-body-content a {
  color: var(--nebula-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color 0.2s ease;
}

.article-body-content a:hover {
  color: var(--pulsar-violet);
}

.article-body-content blockquote {
  border-left: 4px solid var(--nebula-cyan);
  background: rgba(6, 182, 212, 0.08);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: italic;
  color: var(--text-primary);
}

/* 数据对比表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.seo-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
}

.seo-table th,
.seo-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}

.seo-table th {
  background: rgba(139, 92, 246, 0.12);
  color: var(--text-primary);
  font-weight: 700;
  white-space: nowrap;
}

[data-theme="light"] .seo-table th {
  background: #f1f5f9;
}

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

.seo-table tr:hover td {
  background: rgba(6, 182, 212, 0.04);
}

/* 文章内部 FAQ 区块 */
.article-faq-section {
  margin: 48px 0 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.article-faq-item {
  background: rgba(3, 5, 8, 0.45);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin-bottom: 16px;
}

[data-theme="light"] .article-faq-item {
  background: #f8fafc;
}

.article-faq-q {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-faq-q::before {
  content: "Q";
  color: var(--nebula-cyan);
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 1.15rem;
}

.article-faq-a {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  padding-left: 24px;
}

/* 文章底部转化卡片 */
.article-cta-box {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  margin: 45px 0 30px;
}

.article-cta-box h3 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.article-cta-box p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

/* 相关阅读网格 (Related Posts) */
.related-posts-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.related-posts-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-post-card {
  background: rgba(3, 5, 8, 0.45);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

[data-theme="light"] .related-post-card {
  background: #f8fafc;
}

.related-post-card:hover {
  border-color: var(--nebula-cyan);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(6, 182, 212, 0.12);
}

.related-post-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.related-post-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 推荐资讯主聚合页网格 */
.insights-hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  margin: 36px 0;
}

/* 网站地图卡片网格 */
.sitemap-links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.sitemap-card {
  padding: 22px;
  background: rgba(3, 5, 8, 0.45);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

[data-theme="light"] .sitemap-card {
  background: #f8fafc;
}

.sitemap-card:hover {
  border-color: var(--nebula-cyan);
  transform: translateY(-2px);
}

.sitemap-card h3 {
  margin: 0 0 8px 0;
  font-size: 1.15rem;
  color: var(--nebula-cyan);
}

.sitemap-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---------------- 响应式媒体查询 (@media) ---------------- */
@media (max-width: 1100px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
}

@media (max-width: 992px) {
  .features-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .specialty-grid {
    grid-template-columns: 1fr;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

@media (max-width: 820px) {
  .nav-links {
    display: none; /* 移动端精简顶部，聚焦CTA与昼夜切换 */
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .service-tags-grid {
    grid-template-columns: 1fr;
  }
  
  .sitemap-links-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-section {
    padding: 60px 0 45px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }
  
  .subpage-content-wrap {
    padding: 24px;
    margin: 30px 16px 60px;
  }
  
  .cta-banner-card {
    padding: 40px 20px;
  }
  
  .footer-nav-list {
    gap: 20px;
  }
  
  .footer-nav-item a {
    font-size: 0.95rem;
    padding: 8px 10px;
  }
}

@media (max-width: 480px) {
  .site-logo-img {
    height: 30px;
    max-width: 140px;
  }
  
  .brand-tag-badge {
    display: none;
  }

  .hero-stats-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .stat-number {
    font-size: 1.6rem;
  }
}