/* ============================================================
   龙猫云 LongMaoYun - 量子粒子云 · 云锦跃迁 · 粒子科技
   视觉规范与背景动效样式系统 (原生高性能零外部依赖)
   ============================================================ */

:root {
  /* 【配色规范】 */
  --bg-primary: #0A0E27;           /* 主背景：深蓝黑 */
  --bg-card: rgba(16, 23, 58, 0.72);
  --bg-card-hover: rgba(24, 34, 82, 0.88);
  --border-color: rgba(6, 182, 212, 0.18);
  --border-glow: rgba(236, 72, 153, 0.45);

  --color-cyan: #06B6D4;           /* 主色：量子青 */
  --color-pink: #EC4899;           /* 次色：粒子粉 */
  --gradient-main: linear-gradient(135deg, #06B6D4 0%, #EC4899 100%);
  --gradient-reverse: linear-gradient(135deg, #EC4899 0%, #06B6D4 100%);

  --text-main: #FFFFFF;            /* 文字：纯白 */
  --text-muted: rgba(255, 255, 255, 0.6); /* 文字：半透灰白 */
  --text-dim: rgba(255, 255, 255, 0.4);

  /* 【字体规范 · 优先采用本地/系统高质量字体，杜绝外部网络阻塞】 */
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: 'Space Grotesk', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --container-width: 1200px;
  --radius-btn: 12px;              /* CTA 按钮圆角 12px */
  --radius-card: 16px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 无障碍键盘访问跳过导航链接 */
.skip-link {
  position: absolute;
  top: -120px;
  left: 20px;
  background: var(--color-cyan);
  color: #0A0E27;
  padding: 12px 22px;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: 8px;
  z-index: 999999;
  text-decoration: none;
  transition: top 0.2s ease;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.4);
}

.skip-link:focus {
  top: 15px;
  outline: 3px solid #FFFFFF;
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.9);
}

/* 键盘可访问性清晰焦点样式 */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
details:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.5);
}

/* 固定页眉防遮挡锚点处理 */
section[id],
#features,
#media-ai,
#pricing,
#reviews,
#faq {
  scroll-margin-top: 90px;
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

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

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

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

/* ============================================================
   【背景动效】：全屏 Canvas 量子粒子云 + 网格 + 呼吸光晕
   ============================================================ */

/* 1. Canvas 粒子网络画板 */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* 2. 叠加细网格线 (带 radial mask 让边缘渐隐) */
.cyber-grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(6, 182, 212, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6, 182, 212, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at 50% 40%, black 25%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, black 25%, transparent 75%);
  pointer-events: none;
  z-index: 1;
}

/* 3. 两个青/粉大型 blur 光晕 (缓慢呼吸缩放) */
.glow-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 1;
  opacity: 0.38;
  animation: orbBreath 10s infinite alternate ease-in-out;
}

.glow-orb-cyan {
  width: 520px;
  height: 520px;
  background: var(--color-cyan);
  top: -120px;
  left: 8%;
}

.glow-orb-pink {
  width: 560px;
  height: 560px;
  background: var(--color-pink);
  top: 35%;
  right: -100px;
  animation-delay: -5s;
}

@keyframes orbBreath {
  0% {
    transform: scale(0.88) translate(0, 0);
    opacity: 0.28;
  }
  100% {
    transform: scale(1.15) translate(30px, 20px);
    opacity: 0.45;
  }
}

/* ============================================================
   【大标题与文字样式】：Space Grotesk + 青粉渐变 + 双层文字阴影
   ============================================================ */

.font-heading {
  font-family: var(--font-heading);
}

.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  /* 双层辉光阴影 */
  filter: drop-shadow(0 0 16px rgba(6, 182, 212, 0.55)) drop-shadow(0 0 32px rgba(236, 72, 153, 0.4));
}

/* ============================================================
   【CTA 按钮规范】：青到粉渐变 + 圆角12px + 30px青色辉光 (hover变粉)
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 700;
  padding: 13px 30px;
  border-radius: var(--radius-btn); /* 圆角 12px */
  transition: var(--transition);
  cursor: pointer;
  text-align: center;
  border: none;
  min-height: 48px;
  position: relative;
  z-index: 2;
  text-decoration: none;
}

/* 核心 CTA 按钮：青到粉渐变 + 30px 青色辉光，hover 时变粉色辉光 */
.btn-primary {
  background: var(--gradient-main);
  color: #FFFFFF;
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.5); /* 30px 青色辉光 */
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 30px rgba(236, 72, 153, 0.85); /* hover 辉光变粉 */
  color: #FFFFFF;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: #FFFFFF;
  border: 1px solid rgba(6, 182, 212, 0.35);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.15);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-pink);
  box-shadow: 0 0 20px rgba(236, 72, 153, 0.35);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 22px;
  font-size: 0.9rem;
  min-height: 40px;
  border-radius: 10px;
}

.btn-block {
  width: 100%;
}

/* ============================================================
   顶部导航栏
   ============================================================ */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 39, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.brand-logo svg {
  width: 34px;
  height: 34px;
}

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

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--color-cyan);
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.6);
}

.nav-badge-new {
  font-size: 0.65rem;
  font-family: var(--font-heading);
  background: var(--gradient-main);
  color: #FFFFFF;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  margin-left: 5px;
  vertical-align: middle;
  font-weight: 700;
  box-shadow: 0 0 10px rgba(236, 72, 153, 0.6);
}

/* ============================================================
   主视觉区 (Hero Section) 布局结构保持，视觉效果升级
   ============================================================ */

.hero {
  padding: 70px 0 60px;
  position: relative;
  z-index: 2;
}

.hero-layout-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.35);
  color: var(--color-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-cyan);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--color-cyan);
  animation: dotPulse 2s infinite ease-in-out;
}

@keyframes dotPulse {
  0%, 100% { opacity: 0.5; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.2); }
}

/* 左侧：H1「龙猫云」使用 Space Grotesk，标题文字带青到粉渐变 + 双层文字阴影 */
.hero-title {
  font-family: var(--font-heading);
  font-size: 3.4rem;
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-title .brand-name-glow {
  font-family: var(--font-heading);
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  /* 双层文字阴影（青色底层 + 粉色外层） */
  filter: drop-shadow(0 0 18px rgba(6, 182, 212, 0.65)) drop-shadow(0 0 35px rgba(236, 72, 153, 0.5));
}

.hero-intro-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 22px 24px;
  margin-bottom: 28px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

.hero-intro-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  color: var(--color-cyan);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
}

.hero-intro-text {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

/* ============================================================
   【右侧动画（强科技感 + 龙猫）】规范深度实现
   2 层虚线圆轨道反向旋转
   中心 140×140px 青粉径向渐变能量核（3秒脉冲呼吸）
   6 个发光粒子节点（4秒漂浮）
   100×62px 龙猫剪影 SVG（3秒浮动+缩放+双层drop-shadow辉光）
   4 个角落等宽数据标签 [P_01] [P_30] [FLUX_OK] [LIVE]
   ============================================================ */

.hero-visual-stage {
  display: flex;
  justify-content: center;
  align-items: center;
}

.totoro-quantum-stage {
  width: 360px;
  height: 360px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, rgba(16, 23, 58, 0.6) 0%, transparent 70%);
  border-radius: 50%;
}

/* 4 个角落叠加等宽字体数据标签 */
.corner-tag {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(10, 14, 39, 0.85);
  border: 1px solid rgba(6, 182, 212, 0.3);
  backdrop-filter: blur(4px);
  z-index: 10;
}

.corner-tag.top-left {
  top: 10px;
  left: 10px;
  color: var(--color-cyan);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.3);
}

.corner-tag.top-right {
  top: 10px;
  right: 10px;
  color: var(--color-pink);
  box-shadow: 0 0 10px rgba(236, 72, 153, 0.3);
}

.corner-tag.bottom-left {
  bottom: 10px;
  left: 10px;
  color: var(--color-cyan);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.3);
}

.corner-tag.bottom-right {
  bottom: 10px;
  right: 10px;
  color: var(--color-pink);
  border-color: rgba(236, 72, 153, 0.4);
  box-shadow: 0 0 10px rgba(236, 72, 153, 0.4);
}

/* 2 层虚线圆轨道（青/粉）反向旋转 */
.orbit-ring {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.orbit-outer {
  width: 320px;
  height: 320px;
  border: 2px dashed rgba(6, 182, 212, 0.65);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
  animation: rotateClockwise 22s linear infinite;
}

.orbit-inner {
  width: 240px;
  height: 240px;
  border: 2px dashed rgba(236, 72, 153, 0.65);
  box-shadow: 0 0 20px rgba(236, 72, 153, 0.2);
  animation: rotateCounterClockwise 16s linear infinite;
}

@keyframes rotateClockwise {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes rotateCounterClockwise {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}

/* 中心 140×140px 的青粉径向渐变能量核（脉冲呼吸 3 秒一周期） */
.energy-core {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.85) 0%, rgba(6, 182, 212, 0.75) 60%, transparent 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: corePulse 3s infinite ease-in-out;
  z-index: 5;
}

@keyframes corePulse {
  0%, 100% {
    transform: scale(0.94);
    box-shadow: 0 0 25px rgba(6, 182, 212, 0.5), 0 0 45px rgba(236, 72, 153, 0.4);
    opacity: 0.88;
  }
  50% {
    transform: scale(1.08);
    box-shadow: 0 0 45px rgba(6, 182, 212, 0.9), 0 0 75px rgba(236, 72, 153, 0.8);
    opacity: 1;
  }
}

/* 6 个青/粉发光粒子节点分布在核周围，按节奏脉冲漂浮（4 秒一周期，错开延迟） */
.quantum-node {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  z-index: 6;
  animation: nodeFloat 4s infinite ease-in-out;
}

.node-1 {
  top: 35px;
  left: 174px;
  background: var(--color-cyan);
  box-shadow: 0 0 14px var(--color-cyan);
  animation-delay: 0s;
}

.node-2 {
  top: 95px;
  right: 50px;
  background: var(--color-pink);
  box-shadow: 0 0 14px var(--color-pink);
  animation-delay: 0.65s;
}

.node-3 {
  bottom: 95px;
  right: 50px;
  background: var(--color-cyan);
  box-shadow: 0 0 14px var(--color-cyan);
  animation-delay: 1.3s;
}

.node-4 {
  bottom: 35px;
  left: 174px;
  background: var(--color-pink);
  box-shadow: 0 0 14px var(--color-pink);
  animation-delay: 1.95s;
}

.node-5 {
  bottom: 95px;
  left: 50px;
  background: var(--color-cyan);
  box-shadow: 0 0 14px var(--color-cyan);
  animation-delay: 2.6s;
}

.node-6 {
  top: 95px;
  left: 50px;
  background: var(--color-pink);
  box-shadow: 0 0 14px var(--color-pink);
  animation-delay: 3.25s;
}

@keyframes nodeFloat {
  0%, 100% {
    transform: scale(0.85) translate(0, 0);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.3) translate(0, -6px);
    opacity: 1;
  }
}

/* 核中心叠 100×62px 龙猫剪影 SVG（上下浮动 + 缩放动画 3秒一周期 + 双层 drop-shadow 辉光） */
.totoro-svg {
  width: 100px;
  height: 62px;
  animation: totoroFloat 3s infinite ease-in-out;
  /* 双层 drop-shadow 辉光（青色层 + 粉色层） */
  filter: drop-shadow(0 0 10px rgba(6, 182, 212, 0.9)) drop-shadow(0 0 20px rgba(236, 72, 153, 0.75));
  z-index: 8;
}

@keyframes totoroFloat {
  0%, 100% {
    transform: translateY(0px) scale(0.96);
  }
  50% {
    transform: translateY(-8px) scale(1.04);
  }
}

/* ============================================================
   信任背书特征条
   ============================================================ */

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
  margin-top: 20px;
}

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

.highlight-item svg {
  width: 20px;
  height: 20px;
  color: var(--color-cyan);
  flex-shrink: 0;
}

/* ============================================================
   通用区块与核心组件
   ============================================================ */

.section {
  padding: 85px 0;
  position: relative;
  z-index: 2;
}

.section-alt {
  background: rgba(12, 17, 44, 0.6);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-cyan);
  margin-bottom: 12px;
  display: inline-block;
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

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

/* 核心优势卡片 (3 个图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-main);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-cyan);
  transform: translateY(-6px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4), 0 0 24px rgba(6, 182, 212, 0.2);
}

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

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: 12px;
  background: rgba(6, 182, 212, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.feature-icon-wrapper svg {
  width: 28px;
  height: 28px;
  color: var(--color-cyan);
}

.feature-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.feature-list {
  margin-top: 18px;
  list-style: none;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.feature-list li svg {
  width: 15px;
  height: 15px;
  color: var(--color-cyan);
  flex-shrink: 0;
}

/* 流媒体与 AI 支持图卡 (2 个图文卡片) */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.support-card:hover {
  border-color: var(--color-pink);
  transform: translateY(-5px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4), 0 0 25px rgba(236, 72, 153, 0.2);
}

.support-header {
  margin-bottom: 20px;
}

.support-badge {
  display: inline-block;
  padding: 4px 12px;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 6px;
  background: rgba(236, 72, 153, 0.15);
  color: var(--color-pink);
  margin-bottom: 12px;
  border: 1px solid rgba(236, 72, 153, 0.3);
}

.support-title {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.support-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.brand-chips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.brand-chip {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
}

.brand-chip:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-cyan);
}

.chip-icon {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.chip-text {
  font-size: 0.88rem;
  font-weight: 600;
}

/* 套餐价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-cyan);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4), 0 0 20px rgba(6, 182, 212, 0.25);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(20, 28, 70, 0.95) 0%, rgba(13, 18, 48, 0.95) 100%);
  border: 2px solid var(--color-cyan);
  box-shadow: 0 10px 40px rgba(6, 182, 212, 0.35);
  transform: scale(1.04);
  z-index: 5;
}

.pricing-card.featured:hover {
  transform: scale(1.04) translateY(-6px);
  border-color: var(--color-pink);
  box-shadow: 0 14px 45px rgba(236, 72, 153, 0.4);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-main);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 14px rgba(236, 72, 153, 0.5);
}

.plan-name {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  min-height: 42px;
}

.plan-price {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 10px;
}

.plan-sub-billing {
  font-size: 0.82rem;
  color: var(--color-cyan);
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  font-weight: 600;
}

.currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-cyan);
}

.amount {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1;
}

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

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.plan-features li svg {
  width: 17px;
  height: 17px;
  color: var(--color-cyan);
  flex-shrink: 0;
}

.pricing-footnote {
  text-align: center;
  margin-top: 36px;
  font-size: 0.88rem;
  color: var(--text-dim);
}

/* 用户评价 (Reviews) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.review-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(6, 182, 212, 0.4);
  transform: translateY(-4px);
}

.stars {
  color: #fbbf24;
  margin-bottom: 12px;
  display: flex;
  gap: 3px;
}

.stars svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-main);
  line-height: 1.6;
  margin-bottom: 18px;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
}

.reviewer-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: #FFFFFF;
}

.reviewer-info h4 {
  font-size: 0.88rem;
  font-weight: 600;
}

.reviewer-info p {
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* 6个常见问题解答 (FAQ) */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 1060px;
  margin: 0 auto;
}

.faq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 24px 22px;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

details.faq-card {
  display: block;
}

details.faq-card[open] {
  border-color: rgba(6, 182, 212, 0.45);
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.12);
}

.faq-card:hover {
  border-color: var(--color-cyan);
  background: var(--bg-card-hover);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.15);
}

.faq-question {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0;
  color: #FFFFFF;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

details.faq-card summary::-webkit-details-marker {
  display: none;
}

.faq-question h3 {
  font-size: 1.02rem;
  font-weight: 700;
  color: #FFFFFF;
  margin: 0;
  flex: 1;
}

.faq-toggle-icon {
  font-size: 0.8rem;
  color: var(--color-cyan);
  transition: transform 0.25s ease;
  margin-left: auto;
  opacity: 0.8;
}

details.faq-card[open] .faq-toggle-icon {
  transform: rotate(180deg);
  color: var(--color-pink);
}

.faq-q-badge {
  background: rgba(6, 182, 212, 0.15);
  color: var(--color-cyan);
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.faq-answer {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  padding-left: 36px;
  margin-top: 14px;
}

/* 优质内链文字样式 (SEO高权重样式) */
.inline-link {
  color: var(--color-cyan);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--transition);
}

.inline-link:hover {
  color: var(--color-pink);
  text-shadow: 0 0 8px rgba(236, 72, 153, 0.5);
}

/* 文章详情页 FAQ 模块 (默认展开) */
.article-faq-section {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.article-faq-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

details.article-faq-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px 20px;
  transition: var(--transition);
  display: block;
}

details.article-faq-item[open] {
  border-color: rgba(6, 182, 212, 0.4);
  background: rgba(6, 182, 212, 0.04);
}

details.article-faq-item:hover {
  border-color: rgba(6, 182, 212, 0.6);
}

summary.article-faq-summary {
  font-weight: 600;
  font-size: 0.98rem;
  color: #FFFFFF;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  user-select: none;
}

summary.article-faq-summary::-webkit-details-marker {
  display: none;
}

.article-faq-q-text {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

.article-faq-badge {
  background: rgba(236, 72, 153, 0.2);
  color: var(--color-pink);
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--font-heading);
  font-weight: 700;
  flex-shrink: 0;
}

details.article-faq-item .faq-item-answer {
  margin-top: 12px;
  color: var(--text-muted);
  font-size: 0.91rem;
  line-height: 1.75;
  padding-left: 2px;
}

details.article-faq-item .faq-toggle-icon {
  color: var(--color-cyan);
  transition: transform 0.25s ease;
  font-size: 0.75rem;
}

details.article-faq-item[open] .faq-toggle-icon {
  transform: rotate(180deg);
  color: var(--color-pink);
}

/* 文章相关推荐阅读 (内部网状链接) */
.article-related-section {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.article-related-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.article-related-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px 16px;
  text-decoration: none;
  display: block;
  transition: var(--transition);
}

.article-related-card:hover {
  border-color: var(--color-cyan);
  background: rgba(6, 182, 212, 0.06);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(6, 182, 212, 0.15);
}

.article-related-tag {
  font-size: 0.72rem;
  color: var(--color-cyan);
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
}

.article-related-card h4 {
  font-size: 0.88rem;
  color: #FFFFFF;
  line-height: 1.45;
  margin: 0;
  font-weight: 600;
}

@media (max-width: 768px) {
  .article-related-grid {
    grid-template-columns: 1fr;
  }
}

/* 底部 CTA 条 */
.bottom-cta-banner {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(236, 72, 153, 0.15) 100%);
  border: 1px solid rgba(6, 182, 212, 0.35);
  border-radius: var(--radius-card);
  padding: 48px;
  text-align: center;
  margin: 60px auto 0;
  max-width: 960px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

.bottom-cta-banner h3 {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.bottom-cta-banner p {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto 28px;
}

/* 页脚 (只保留 4 个标题：网站地图、关于我们、服务条款、隐私政策) */
.footer {
  background: #070A1E;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 35px;
  position: relative;
  z-index: 2;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  list-style: none;
  margin-bottom: 30px;
}

.footer-nav a {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: var(--transition);
  position: relative;
  padding-bottom: 4px;
}

.footer-nav a:hover {
  color: var(--color-cyan);
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

.footer-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--gradient-main);
  transition: var(--transition);
}

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

.footer-bottom {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
}

/* 子页面通用布局 */
.subpage-hero {
  padding: 60px 0 30px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: rgba(12, 17, 44, 0.6);
  position: relative;
  z-index: 2;
}

/* 知识科普 3x3 栅格排版 */
.articles-grid-3x3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.article-card-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: relative;
  overflow: hidden;
}

.article-card-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-cyan);
  transform: translateY(-5px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.45), 0 0 20px rgba(6, 182, 212, 0.22);
}

.subpage-title {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.subpage-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
}

.subpage-content {
  padding: 50px 0 80px;
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.policy-block {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 32px;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.policy-block h2 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.policy-block p, .policy-block li {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.policy-block ul {
  padding-left: 20px;
  margin-top: 10px;
}

.back-home-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-cyan);
  font-weight: 600;
  margin-bottom: 20px;
}

/* ============================================================
   响应式媒体查询 (@media)
   ============================================================ */

@media (max-width: 1024px) {
  .articles-grid-3x3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-layout-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-intro-card {
    text-align: left;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-title {
    font-size: 2.8rem;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid .feature-card:last-child {
    grid-column: span 2;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .articles-grid-3x3 {
    grid-template-columns: 1fr;
  }
  .navbar {
    padding: 12px 0;
  }
  .nav-links {
    display: none;
  }
  .hero {
    padding: 40px 0 30px;
  }
  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .hero-highlights {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  
  .totoro-quantum-stage {
    width: 290px;
    height: 290px;
    margin: 10px auto;
  }
  .orbit-outer {
    width: 270px;
    height: 270px;
  }
  .orbit-inner {
    width: 200px;
    height: 200px;
  }
  .energy-core {
    width: 120px;
    height: 120px;
  }
  
  .section {
    padding: 50px 0;
  }
  .section-title {
    font-size: 1.75rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  .features-grid .feature-card:last-child {
    grid-column: auto;
  }
  
  .media-ai-grid {
    grid-template-columns: 1fr;
  }
  .brand-chips-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  
  .faq-grid {
    grid-template-columns: 1fr;
  }
  .faq-answer {
    padding-left: 0;
    margin-top: 8px;
  }

  .bottom-cta-banner {
    padding: 30px 18px;
  }
  .bottom-cta-banner h3 {
    font-size: 1.45rem;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
  
  .btn {
    min-height: 50px;
    font-size: 1.05rem;
  }

  .btn-sm {
    min-height: 44px;
    padding: 10px 18px;
  }

  .nav-links a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  summary.faq-question,
  summary.article-faq-summary {
    min-height: 44px;
  }
}

/* ============================================================
   减弱动效偏好媒体查询 (Accessibility / WCAG 2.1 AA)
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  #particle-canvas {
    display: none !important;
  }

  .orbit-ring,
  .totoro-svg,
  .energy-core,
  .quantum-node,
  .glow-orb {
    animation: none !important;
  }
}