/* ===================================================================
   贝贝云 (beibeicloud.buzz) - 官方轻奢斐波那契母贝美学样式表
   Nautilus Fibonacci-spiral & Iridescent Mother-of-Pearl Luxury UI
   零重型外部依赖 | 纯原生 CSS3 | 薄膜干涉微交互 | 秒开级加载
   =================================================================== */

:root {
  /* ================= 浅色调（默认）：Pristine Nacre Ivory & Coastal Luxury ================= */
  --bg-primary: #fcfbf9;             /* 纯净母贝象牙白 */
  --bg-surface: #ffffff;             /* 高雅白润板卡 */
  --bg-surface-secondary: #f4f1eb;   /* 柔润海浪细砂雾面 */
  --bg-surface-elevated: #ffffff;
  --bg-pearl-glass: rgba(252, 251, 249, 0.85);
  --bg-nav: rgba(252, 251, 249, 0.92);

  --text-primary: #18181b;           /* 远洋深海板岩黑灰 (Deep oceanic slate) */
  --text-secondary: #3f3f46;         /* 优雅次级文字 */
  --text-muted: #71717a;             /* 辅助说明暗调 */
  --text-inverse: #ffffff;

  --border-color: rgba(24, 24, 27, 0.08);
  --border-subtle: rgba(24, 24, 27, 0.04);
  --border-pearl: rgba(6, 182, 212, 0.25);

  --primary: #0f766e;                /* 深海松石翡翠绿 */
  --primary-hover: #115e59;
  --primary-light: rgba(15, 118, 110, 0.08);

  --accent-cyan: #0891b2;            /* 纯澈海青 */
  --accent-rose: #e11d48;            /* 贝母微粉玫瑰 */
  --accent-pearl-cyan: #06b6d4;
  --accent-amber: #d97706;
  --accent-emerald: #059669;

  /* 薄膜干涉彩虹光泽（Thin-film iridescence highlights: cyan to blush-rose） */
  --sheen-gradient: linear-gradient(
    135deg,
    rgba(165, 243, 252, 0.35) 0%,
    rgba(254, 205, 211, 0.28) 40%,
    rgba(224, 231, 255, 0.32) 75%,
    rgba(254, 240, 138, 0.22) 100%
  );
  --pearl-sheen-soft: linear-gradient(135deg, rgba(240, 253, 250, 0.8) 0%, rgba(255, 241, 242, 0.8) 100%);
  --brand-gradient: linear-gradient(135deg, #0f766e 0%, #0284c7 50%, #4338ca 100%);
  --gradient-badge: linear-gradient(135deg, rgba(15, 118, 110, 0.08) 0%, rgba(6, 182, 212, 0.12) 100%);

  /* 斐波那契圆角序列 (Fibonacci sequence: 8, 13, 21, 34, 55px) */
  --radius-8: 8px;
  --radius-13: 13px;
  --radius-21: 21px;
  --radius-34: 34px;
  --radius-55: 55px;
  --radius-full: 9999px;

  /* 阴影层次 */
  --shadow-sm: 0 1px 3px rgba(24, 24, 27, 0.04);
  --shadow-md: 0 4px 14px rgba(24, 24, 27, 0.06);
  --shadow-lg: 0 10px 30px -5px rgba(24, 24, 27, 0.08);
  --shadow-pearl: 0 16px 40px -10px rgba(15, 118, 110, 0.1), 0 20px 45px -15px rgba(225, 29, 72, 0.06);

  /* 物理弹簧阻尼微交互动效 (Silky spring damping curve) */
  --spring-damping: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.18s ease;
  --transition-base: 0.32s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);

  --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', Consolas, Monaco, 'JetBrains Mono', monospace;
}

/* ================= 黑夜模式：Oceanic Abyss & Bioluminescent Pearl ================= */
[data-theme="dark"] {
  --bg-primary: #0a0e17;             /* 深海午夜海沟黑蓝 */
  --bg-surface: #121927;             /* 润泽黑珍珠暗面 */
  --bg-surface-secondary: #172134;   /* 幽暗海砂层 */
  --bg-surface-elevated: #1e2a42;
  --bg-pearl-glass: rgba(18, 25, 39, 0.88);
  --bg-nav: rgba(10, 14, 23, 0.92);

  --text-primary: #f8fafc;           /* 荧光净白 */
  --text-secondary: #cbd5e1;         /* 雾感珍珠灰 */
  --text-muted: #64748b;             /* 深蓝微光 */
  --text-inverse: #0a0e17;

  --border-color: rgba(255, 255, 255, 0.09);
  --border-subtle: rgba(255, 255, 255, 0.05);
  --border-pearl: rgba(56, 189, 248, 0.3);

  --primary: #38bdf8;                /* 生物荧光天蓝 */
  --primary-hover: #7dd3fc;
  --primary-light: rgba(56, 189, 248, 0.15);

  --accent-cyan: #38bdf8;
  --accent-rose: #fb7185;            /* 深海极光玫瑰 */
  --accent-pearl-cyan: #22d3ee;
  --accent-amber: #fbbf24;
  --accent-emerald: #34d399;

  --sheen-gradient: linear-gradient(
    135deg,
    rgba(56, 189, 248, 0.2) 0%,
    rgba(251, 113, 133, 0.16) 40%,
    rgba(167, 139, 250, 0.18) 75%,
    rgba(253, 224, 71, 0.12) 100%
  );
  --pearl-sheen-soft: linear-gradient(135deg, rgba(23, 33, 52, 0.8) 0%, rgba(30, 42, 66, 0.8) 100%);
  --brand-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #f472b6 100%);
  --gradient-badge: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(244, 114, 182, 0.15) 100%);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 10px 30px -5px rgba(0, 0, 0, 0.65);
  --shadow-pearl: 0 16px 45px -10px rgba(56, 189, 248, 0.18), 0 20px 50px -15px rgba(0, 0, 0, 0.9);
}

/* ================= 全局重置与几何骨架 ================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.68;
  transition: background-color var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
  position: relative;
  letter-spacing: -0.01em;
}

/* 斐波那契螺旋背景晕染层 */
body::before {
  content: '';
  position: fixed;
  top: -200px;
  right: -100px;
  width: 900px;
  height: 900px;
  background: radial-gradient(
    circle,
    rgba(165, 243, 252, 0.18) 0%,
    rgba(254, 205, 211, 0.12) 38%,
    rgba(224, 231, 255, 0.08) 65%,
    transparent 80%
  );
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
}

[data-theme="dark"] body::before {
  background: radial-gradient(
    circle,
    rgba(56, 189, 248, 0.15) 0%,
    rgba(244, 114, 182, 0.1) 40%,
    transparent 75%
  );
  filter: blur(120px);
}

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

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

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

.container {
  width: 100%;
  max-width: 1220px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 100px 0;
  position: relative;
}

/* ================= 头部与导航栏 (Header) ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-slow), border-color var(--transition-slow);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

/* 品牌 Logo */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-brand-logo {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--brand-gradient);
  border-radius: var(--radius-13);
  color: #fff;
  box-shadow: 0 6px 16px rgba(15, 118, 110, 0.25);
  position: relative;
}

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

/* 导航菜单（带动态平滑滚动与光标高亮） */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: var(--bg-surface-secondary);
}

/* 导航中特别标识的“推荐资讯”入口 */
.nav-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
  font-weight: 600;
  color: var(--primary);
}

.nav-link-badge::after {
  content: 'HOT';
  font-size: 0.65rem;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--accent-rose);
  color: #fff;
  line-height: 1.2;
}

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

/* ================= 昼夜模式切换按钮（母贝微光质感） ================= */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-13);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--sheen-gradient);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.theme-toggle-btn:hover {
  border-color: var(--border-pearl);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: var(--primary);
}

.theme-toggle-btn:hover::before {
  opacity: 0.8;
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  position: relative;
  z-index: 1;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.theme-icon-sun {
  display: block;
}

.theme-icon-moon {
  display: none;
}

[data-theme="dark"] .theme-icon-sun {
  display: none;
}

[data-theme="dark"] .theme-icon-moon {
  display: block;
}

.mobile-toggle-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-8);
  align-items: center;
  justify-content: center;
  background: var(--bg-surface-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

/* ================= 按钮系统 (Buttons) ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--brand-gradient);
  color: #ffffff !important;
  box-shadow: 0 6px 20px rgba(15, 118, 110, 0.28);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(15, 118, 110, 0.36);
  filter: brightness(1.05);
}

.btn-outline {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

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

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

.btn-block {
  width: 100%;
}

/* ================= 排版与通用徽章 ================= */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--gradient-badge);
  border: 1px solid var(--border-pearl);
  border-radius: var(--radius-full);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 18px;
  white-space: nowrap;
}

.section-title {
  font-size: 2.45rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.025em;
}

.section-title .gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ================= 主视觉区 (Hero Section - Fibonacci 比例分割) ================= */
.hero-section {
  padding: 70px 0 100px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  background: var(--gradient-badge);
  border: 1px solid var(--border-pearl);
  border-radius: var(--radius-full);
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
  white-space: nowrap;
}

.hero-badge .ping-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulsePing 2s infinite ease-in-out;
}

@keyframes pulsePing {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}

/* 大标题包含当前品牌名“贝贝云”并严禁单字被挤落分行 */
.hero-headline {
  font-size: clamp(1.85rem, 2.5vw, 2.65rem);
  font-weight: 900;
  line-height: 1.32;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
  color: var(--text-primary);
  word-break: keep-all;
}

.headline-nowrap {
  display: block;
  white-space: nowrap; /* 核心：严禁字符分行折行 */
}

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

/* 简介文案 */
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 36px;
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* 指标胶囊墙 */
.hero-metrics-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 580px;
}

.metric-pill {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 16px 18px;
  border-radius: var(--radius-13);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.metric-pill:hover {
  transform: translateY(-2px);
  border-color: var(--border-pearl);
}

.metric-value {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  font-feature-settings: "tnum";
}

.metric-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 4px;
}

/* ================= 右侧视觉展台：母贝曲面叠羽 + 极客等宽 IPLC 监控屏 ================= */
.hero-visual-board {
  position: relative;
  border-radius: var(--radius-34);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 24px;
  box-shadow: var(--shadow-pearl);
  overflow: hidden;
}

/* 真实薄膜干涉彩虹光泽（Thin-film interference sheen overlay） */
.hero-visual-board::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--sheen-gradient);
  opacity: 0.65;
  pointer-events: none;
  z-index: 1;
}

.shell-louvers-wrap {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* 监控屏控制台顶部 */
.monitor-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-surface-secondary);
  border-radius: var(--radius-13);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.monitor-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  display: inline-block;
  margin-right: 6px;
}

/* 叠羽母贝卡片 (Curved shell louvers framing crisp monospace metrics) */
.shell-louver-item {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-21);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.shell-louver-item::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--brand-gradient);
  opacity: 0.7;
}

.shell-louver-item:hover {
  transform: translateX(4px);
  border-color: var(--border-pearl);
  box-shadow: var(--shadow-md);
}

.louver-node-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.louver-code {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.louver-tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-surface-secondary);
  color: var(--text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.louver-metrics {
  text-align: right;
  font-family: var(--font-mono);
  white-space: nowrap;
}

.louver-latency {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--accent-emerald);
  white-space: nowrap;
}

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

/* 斐波那契螺旋轻奢装饰角标 */
.fibonacci-watermark {
  padding: 12px 16px;
  border-radius: var(--radius-13);
  background: var(--bg-surface-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  border: 1px dashed var(--border-color);
}

/* ================= 核心优势介绍 (3个图文卡片) ================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-34);
  padding: 40px 32px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

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

.feature-icon-wrapper {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-21);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 26px;
  color: #fff;
  background: var(--brand-gradient);
  box-shadow: 0 8px 20px rgba(15, 118, 110, 0.22);
}

.feature-icon-wrapper svg {
  width: 30px;
  height: 30px;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.72;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-meta-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
}

.feature-meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.feature-meta-item svg {
  width: 16px;
  height: 16px;
  color: var(--primary);
  flex-shrink: 0;
}

/* ================= 流媒体与AI生产力赋能板块 (2大卡片) ================= */
.unlock-showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.unlock-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-34);
  padding: 44px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

.unlock-card-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.unlock-tag-media {
  background: rgba(225, 29, 72, 0.1);
  color: var(--accent-rose);
}

.unlock-tag-ai {
  background: rgba(15, 118, 110, 0.1);
  color: var(--primary);
}

.unlock-card-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.unlock-card-desc {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.72;
  margin-bottom: 28px;
}

.services-badge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.service-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--bg-surface-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-13);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.service-pill:hover {
  border-color: var(--primary);
  transform: scale(1.02);
  background: var(--bg-surface-elevated);
}

.service-pill svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.unlock-footer-tip {
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.unlock-footer-tip svg {
  width: 16px;
  height: 16px;
  color: var(--primary);
  flex-shrink: 0;
}

/* ================= 套餐价格对比表（参考网上真实套餐价格） ================= */
.pricing-section {
  background: var(--bg-surface-secondary);
  transition: background-color var(--transition-slow);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

/* 遵循提示词：Hovering over subscription tiers imparts a gentle 2px buoyant lift with silky spring damping */
.pricing-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-34);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: transform 0.45s var(--spring-damping), box-shadow 0.45s var(--spring-damping), border-color 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-2px); /* 2px buoyant lift */
  box-shadow: var(--shadow-pearl);
  border-color: var(--border-pearl);
}

.pricing-card.popular {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-pearl);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--brand-gradient);
  color: #ffffff;
  padding: 5px 16px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  white-space: nowrap; /* 核心：严禁折行分行 */
  box-shadow: 0 4px 14px rgba(15, 118, 110, 0.3);
  z-index: 2;
}

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

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

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

.plan-price-wrap {
  margin: 20px 0 6px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.plan-currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.plan-price {
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  font-feature-settings: "tnum";
}

.plan-period {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.plan-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--accent-emerald);
  flex-shrink: 0;
  margin-top: 2px;
}

.plan-feature-item.highlight {
  font-weight: 600;
  color: var(--text-primary);
}

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

.review-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-21);
  padding: 34px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.review-stars {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 18px;
}

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

.review-comment {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.72;
  margin-bottom: 24px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  background: var(--brand-gradient);
  flex-shrink: 0;
}

.author-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

/* ================= 常见问题 (FAQ 手风琴) ================= */
.faq-wrap {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-21);
  overflow: hidden;
  transition: all var(--transition-fast);
}

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

.faq-header {
  padding: 22px 28px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  background: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-header:hover {
  color: var(--primary);
}

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

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

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
  background: var(--bg-surface);
}

.faq-item.open .faq-body {
  max-height: 400px;
}

.faq-content {
  padding: 0 28px 24px;
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ================= 推荐资讯专区卡片组件 ================= */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.news-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-34);
  padding: 36px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.news-tag {
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--gradient-badge);
  color: var(--primary);
  font-weight: 600;
}

.news-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
  line-height: 1.4;
}

.news-excerpt {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.72;
  margin-bottom: 24px;
}

.news-action {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ================= 底部转化横幅 (CTA Banner) ================= */
.cta-banner-section {
  padding: 80px 0;
}

.cta-banner-box {
  background: var(--brand-gradient);
  border-radius: var(--radius-34);
  padding: 64px 44px;
  text-align: center;
  color: #ffffff;
  box-shadow: var(--shadow-pearl);
  position: relative;
  overflow: hidden;
}

.cta-banner-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--sheen-gradient);
  opacity: 0.18;
  pointer-events: none;
}

.cta-banner-title {
  font-size: 2.35rem;
  font-weight: 900;
  margin-bottom: 16px;
  line-height: 1.25;
}

.cta-banner-subtitle {
  font-size: 1.15rem;
  opacity: 0.92;
  max-width: 680px;
  margin: 0 auto 36px;
}

.cta-banner-btn {
  background: #ffffff !important;
  color: #0f172a !important;
  font-weight: 700;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.2);
}

.cta-banner-btn:hover {
  transform: translateY(-2px);
  background: #f8fafc !important;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.28);
}

/* ================= 页脚规范：严格仅保留四个标题链接，打开新页面 ================= */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 52px 0;
  transition: background-color var(--transition-slow), border-color var(--transition-slow);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  text-align: center;
}

.footer-brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-links-only {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 36px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links-only li a {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-8);
}

.footer-links-only li a:hover {
  color: var(--primary);
  background: var(--bg-surface-secondary);
  transform: translateY(-1px);
}

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

/* ================= 独立子页面通用文档卡片 (Doc Card) ================= */
.doc-page {
  padding: 60px 0 100px;
}

.doc-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-34);
  padding: 56px;
  box-shadow: var(--shadow-sm);
  max-width: 920px;
  margin: 0 auto;
}

.doc-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 26px;
  margin-bottom: 38px;
}

.doc-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.doc-meta {
  font-size: 0.92rem;
  color: var(--text-muted);
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.doc-section {
  margin-bottom: 38px;
}

.doc-section h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-section p, .doc-section li {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}

.doc-section ul, .doc-section ol {
  padding-left: 24px;
  margin-bottom: 18px;
}

/* ================= SEO 文章增强结构：目录 (TOC)、对比表格、问答与相关阅读 ================= */
.article-toc {
  background: var(--bg-surface-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-21);
  padding: 24px 28px;
  margin-bottom: 36px;
}

.article-toc-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.article-toc-list li a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition-fast);
}

.article-toc-list li a:hover {
  color: var(--primary);
  text-decoration: underline;
}

.article-toc-list li::before {
  content: '§';
  color: var(--primary);
  font-weight: bold;
  font-size: 0.85rem;
}

/* 深度对比表格 */
.seo-table-wrap {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: var(--radius-13);
  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-subtle);
}

.seo-table th {
  background: var(--bg-surface-secondary);
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

.seo-table tr:hover td {
  background: var(--bg-surface-elevated);
}

/* 文章专属 FAQ 板块 */
.article-faq-box {
  background: var(--bg-surface-secondary);
  border-radius: var(--radius-21);
  padding: 30px;
  margin: 36px 0;
  border: 1px solid var(--border-color);
}

.article-faq-item {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--border-subtle);
}

.article-faq-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

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

.article-faq-q-badge {
  background: var(--primary);
  color: #fff;
  font-size: 0.75rem;
  padding: 1px 7px;
  border-radius: 4px;
  font-weight: 800;
  line-height: 1.4;
  flex-shrink: 0;
  margin-top: 3px;
}

.article-faq-a {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.72;
  padding-left: 28px;
}

/* 相关阅读网格 (Related Reading) */
.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.related-post-card {
  background: var(--bg-surface-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-13);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-base);
}

.related-post-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.related-post-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.related-post-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 10px;
}

.related-post-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.doc-highlight-box {
  background: var(--bg-surface-secondary);
  border-left: 4px solid var(--primary);
  padding: 20px 26px;
  border-radius: 0 var(--radius-13) var(--radius-13) 0;
  margin: 22px 0;
}

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

.back-home-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
}

/* ================= 移动端与各断点媒体查询 (@media) ================= */
@media (max-width: 1080px) {
  .hero-headline {
    font-size: clamp(1.8rem, 3.2vw, 2.45rem);
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .unlock-showcase-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .hero-section {
    padding: 40px 0 60px;
  }

  .hero-badge {
    white-space: normal;
    font-size: 0.82rem;
    line-height: 1.45;
    padding: 6px 14px;
  }

  .hero-headline {
    font-size: clamp(1.35rem, 4.8vw, 1.95rem);
    line-height: 1.32;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  .hero-metrics-strip {
    grid-template-columns: 1fr;
  }

  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .news-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .services-badge-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .mobile-toggle-btn {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: var(--shadow-lg);
    transform: translateY(-150%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-base);
    z-index: 99;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    font-size: 1.05rem;
    width: 100%;
    text-align: center;
    padding: 10px 0;
  }

  .nav-actions .btn {
    display: none;
  }

  .nav-menu .mobile-cta-btn {
    display: flex;
    width: 100%;
    margin-top: 8px;
  }

  .footer-links-only {
    gap: 18px;
    flex-direction: column;
  }

  .doc-card {
    padding: 30px 20px;
  }

  .doc-title {
    font-size: 1.85rem;
  }

  .cta-banner-box {
    padding: 44px 24px;
  }

  .cta-banner-title {
    font-size: 1.85rem;
  }
}

@media (max-width: 480px) {
  .hero-headline {
    font-size: clamp(1.15rem, 5.8vw, 1.55rem);
  }

  .pricing-ribbon {
    font-size: 0.72rem;
    padding: 4px 12px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .services-badge-grid {
    grid-template-columns: 1fr;
  }

  .monitor-topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .shell-louver-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .louver-metrics {
    text-align: left;
    margin-top: 6px;
  }
}