/* ==========================================================================
   肥猫云 FeiMaoYun - 天体物理·黑洞吸积盘·引力奇点 深度定制视觉系统
   配色：#000000 纯黑 | #FCD34D 吸积黄 | #FF6B35 喷流橙 | 文字 #FFFFFF / rgba(255,255,255,0.7)
   性能：纯原生系统字体栈 | 零外部网络依赖 | 秒开渲染
   ========================================================================== */

:root {
  /* 基础主色调 */
  --bg-primary: #000000;
  --bg-secondary: #050505;
  --bg-card: rgba(14, 12, 10, 0.78);
  --bg-card-hover: rgba(22, 18, 14, 0.92);
  --border-color: rgba(252, 211, 77, 0.14);
  --border-hover: rgba(255, 107, 53, 0.55);

  /* 天体黑洞专属色系 */
  --primary-yellow: #FCD34D;
  --secondary-orange: #FF6B35;
  --primary-gradient: linear-gradient(135deg, #FCD34D 0%, #FF6B35 100%);
  --glow-yellow: rgba(252, 211, 77, 0.4);
  --glow-orange: rgba(255, 107, 53, 0.7);

  /* 文字颜色体系 (符合 WCAG AA 4.5:1 对比度标准) */
  --text-main: #FFFFFF;
  --text-muted: rgba(255, 255, 255, 0.7);
  --text-sub: rgba(255, 255, 255, 0.88);

  /* 基础阴影与圆角 (CTA 按钮固定 8px) */
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 10px 30px -5px rgba(0, 0, 0, 0.9), 0 0 20px rgba(252, 211, 77, 0.12);
  --radius-btn: 8px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --container-width: 1180px;
}

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

/* 锚点平滑跳转与固定页眉防遮挡 */
section[id], article[id], div[id] {
  scroll-margin-top: 88px;
}

/* 键盘焦点指示器 */
:focus-visible {
  outline: 2px solid var(--primary-yellow);
  outline-offset: 4px;
}

/* 无障碍跳链：跳转到主要内容 */
.skip-link {
  position: absolute;
  top: -120px;
  left: 20px;
  background: var(--primary-gradient);
  color: #000000;
  padding: 12px 22px;
  border-radius: var(--radius-btn);
  font-weight: 700;
  font-size: 0.95rem;
  z-index: 999999;
  transition: top 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  box-shadow: 0 0 25px var(--glow-yellow);
}

.skip-link:focus {
  top: 18px;
}

html {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  position: relative;
}

/* ==========================================================================
   全屏天体物理背景动效系统
   径向黄/橙辉光 + 80 颗闪烁星点 + 2 个螺旋坠落尘埃粒子 + 细网格渐隐
   ========================================================================== */

.cosmic-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 全屏径向渐变黄/橙辉光 */
.cosmic-glow {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 75% 30%, rgba(255, 107, 53, 0.18) 0%, rgba(252, 211, 77, 0.08) 32%, transparent 65%),
    radial-gradient(circle at 20% 70%, rgba(252, 211, 77, 0.12) 0%, rgba(255, 107, 53, 0.06) 30%, transparent 60%),
    radial-gradient(circle at 50% 50%, rgba(252, 211, 77, 0.04) 0%, transparent 75%);
}

/* 叠加细网格，边缘渐隐 */
.cosmic-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(252, 211, 77, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(252, 211, 77, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 45%, rgba(0, 0, 0, 0.9) 10%, rgba(0, 0, 0, 0.1) 70%, transparent 95%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 45%, rgba(0, 0, 0, 0.9) 10%, rgba(0, 0, 0, 0.1) 70%, transparent 95%);
}

/* 80 颗星点随机闪烁 */
.stars-field {
  position: absolute;
  inset: 0;
}

.star {
  position: absolute;
  background-color: #ffffff;
  border-radius: 50%;
  animation: starTwinkle var(--twinkle-duration, 3s) infinite ease-in-out alternate;
}

@keyframes starTwinkle {
  0% { opacity: 0.15; transform: scale(0.7); }
  50% { opacity: 0.9; transform: scale(1.2); box-shadow: 0 0 6px rgba(255, 255, 255, 0.8); }
  100% { opacity: 0.2; transform: scale(0.8); }
}

/* 2 个宇宙尘埃粒子按螺旋轨道向中心坠落 (8秒/10秒周期，720°旋转，半径 30vw 缩到 5vw) */
.dust-spiral-container {
  position: absolute;
  top: 360px;
  right: 25%;
  width: 0;
  height: 0;
  pointer-events: none;
}

.dust-particle {
  position: absolute;
  top: 0;
  left: 0;
  border-radius: 50%;
  transform-origin: 0 0;
}

.dust-1 {
  width: 6px;
  height: 6px;
  background: var(--primary-yellow);
  box-shadow: 0 0 12px 2px var(--primary-yellow);
  animation: spiralGravity1 8s infinite cubic-bezier(0.4, 0, 0.2, 1);
}

.dust-2 {
  width: 5px;
  height: 5px;
  background: var(--secondary-orange);
  box-shadow: 0 0 10px 2px var(--secondary-orange);
  animation: spiralGravity2 10s infinite cubic-bezier(0.4, 0, 0.2, 1);
  animation-delay: -4s;
}

@keyframes spiralGravity1 {
  0% {
    transform: rotate(0deg) translateX(30vw) scale(1.2);
    opacity: 0.85;
  }
  75% {
    opacity: 0.9;
  }
  100% {
    transform: rotate(720deg) translateX(5vw) scale(0.2);
    opacity: 0;
  }
}

@keyframes spiralGravity2 {
  0% {
    transform: rotate(180deg) translateX(32vw) scale(1.1);
    opacity: 0.8;
  }
  75% {
    opacity: 0.9;
  }
  100% {
    transform: rotate(900deg) translateX(5vw) scale(0.15);
    opacity: 0;
  }
}

/* 页面内容在背景之上 */
.header, .hero, .section, .bottom-cta, .footer, main {
  position: relative;
  z-index: 1;
}

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

/* ==========================================================================
   导航栏系统
   ========================================================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background-color: rgba(0, 0, 0, 0.85);
  border-bottom: 1px solid var(--border-color);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: 'Orbitron', sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.5px;
}

.logo-badge {
  background: var(--primary-gradient);
  color: #000;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(252, 211, 77, 0.45);
}

.logo span {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 20px rgba(252, 211, 77, 0.3);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  color: var(--text-sub);
  font-size: 0.93rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-link:hover {
  color: var(--primary-yellow);
}

.nav-link.highlight-nav {
  color: var(--primary-yellow);
  font-weight: 600;
}

.nav-link.highlight-nav:hover {
  color: #fff;
  text-shadow: 0 0 10px var(--primary-yellow);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* ==========================================================================
   CTA 按钮系统 (需求规范：黄到橙渐变、文字纯黑、圆角8px、30px黄色辉光、hover变橙)
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-btn); /* 固定 8px */
  cursor: pointer;
  transition: all 0.28s ease;
  border: 1px solid transparent;
  min-height: 46px;
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #000000; /* 纯黑文字 */
  box-shadow: 0 0 30px var(--glow-yellow); /* 30px 黄色辉光 */
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px var(--glow-orange); /* hover 辉光变橙 */
  filter: brightness(1.06);
  color: #000000;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--border-color);
  color: #ffffff;
  border-radius: var(--radius-btn);
}

.btn-secondary:hover {
  background: rgba(252, 211, 77, 0.1);
  border-color: var(--primary-yellow);
  color: var(--primary-yellow);
  box-shadow: 0 0 15px rgba(252, 211, 77, 0.25);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.05rem;
  min-height: 52px;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.9rem;
  min-height: 44px;
  min-width: 44px;
}

/* ==========================================================================
   主视觉区 (Hero: 左侧大标题+简介+CTA, 右侧 320x320 吸积盘引力奇点动画)
   ========================================================================== */

.hero {
  padding: 70px 0 65px;
  position: relative;
}

.hero-main-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
  margin-bottom: 50px;
}

.hero-left {
  text-align: left;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(252, 211, 77, 0.08);
  border: 1px solid rgba(252, 211, 77, 0.28);
  border-radius: var(--radius-btn);
  color: var(--primary-yellow);
  font-size: 0.84rem;
  font-weight: 600;
  margin-bottom: 22px;
  letter-spacing: 0.5px;
}

/* H1「肥猫云」使用 Orbitron 800 字重，标题文字带黄到橙渐变 + 双层文字阴影 */
.hero-title {
  font-family: 'Orbitron', -apple-system, sans-serif;
  font-weight: 800;
  font-size: 3.6rem;
  line-height: 1.12;
  letter-spacing: -0.5px;
  margin-bottom: 22px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  /* 双层文字阴影：一层黄色内聚，一层橙色外散 */
  text-shadow: 
    0 0 20px rgba(252, 211, 77, 0.45),
    0 0 50px rgba(255, 107, 53, 0.35);
  filter: drop-shadow(0 0 15px rgba(252, 211, 77, 0.2));
}

.hero-subtitle {
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 1.28rem;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted); /* rgba(255,255,255,0.5) */
  margin-bottom: 34px;
  line-height: 1.75;
  max-width: 620px;
}

.hero-desc strong {
  color: #FFFFFF;
  font-weight: 600;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* 右侧 320×320px 黑洞吸积盘天体结构 */
.hero-right-animation {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.blackhole-container {
  width: 320px;
  height: 320px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1000px;
}

/* 外层吸积盘：320×320px，conic-gradient 黄/橙循环 + blur(8px)，rotateX 75° 倾斜 + rotateZ 360° 旋转 8 秒一周期 */
.accretion-disk-outer {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    #FCD34D 0%,
    #FF6B35 25%,
    #b91c1c 45%,
    #FF6B35 70%,
    #FCD34D 100%
  );
  filter: blur(8px);
  transform: rotateX(75deg);
  animation: rotateOuterDisk 8s linear infinite;
  box-shadow: 0 0 40px rgba(252, 211, 77, 0.35);
}

@keyframes rotateOuterDisk {
  0% { transform: rotateX(75deg) rotateZ(0deg); }
  100% { transform: rotateX(75deg) rotateZ(360deg); }
}

/* 内层吸积盘：240×240px，反向旋转 6 秒一周期 */
.accretion-disk-inner {
  position: absolute;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: conic-gradient(
    from 180deg,
    #FF6B35 0%,
    #FCD34D 30%,
    #ffffff 50%,
    #FCD34D 70%,
    #FF6B35 100%
  );
  filter: blur(4px);
  transform: rotateX(75deg);
  animation: rotateInnerDisk 6s linear infinite reverse;
}

@keyframes rotateInnerDisk {
  0% { transform: rotateX(75deg) rotateZ(0deg); }
  100% { transform: rotateX(75deg) rotateZ(360deg); }
}

/* 事件视界外：150×150px 黄色光子环 (2px 描边 + 双层辉光 + 脉冲呼吸 2 秒一周期) */
.photon-ring {
  position: absolute;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  border: 2px solid #FCD34D;
  box-shadow: 
    0 0 15px 3px rgba(252, 211, 77, 0.7),
    0 0 35px 8px rgba(255, 107, 53, 0.45);
  animation: photonPulse 2s ease-in-out infinite alternate;
  z-index: 3;
}

@keyframes photonPulse {
  0% {
    transform: scale(0.96);
    box-shadow: 
      0 0 12px 2px rgba(252, 211, 77, 0.6),
      0 0 25px 5px rgba(255, 107, 53, 0.35);
  }
  100% {
    transform: scale(1.05);
    box-shadow: 
      0 0 24px 6px rgba(252, 211, 77, 0.9),
      0 0 50px 12px rgba(255, 107, 53, 0.65);
  }
}

/* 中心：140×140px 黑色事件视界 (径向阴影模拟引力透镜) */
.event-horizon {
  position: absolute;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: #000000;
  box-shadow: 
    inset 0 0 25px rgba(0, 0, 0, 1),
    0 0 30px 10px rgba(0, 0, 0, 0.98),
    0 0 12px 2px rgba(255, 107, 53, 0.4);
  z-index: 4;
}

/* 黑洞上下两端各一条 6×80px 黄色相对论性喷流 (脉冲缩放 1.5 秒一周期，模拟物质喷出) */
.relativistic-jet {
  position: absolute;
  width: 6px;
  height: 80px;
  border-radius: 4px;
  z-index: 5;
  filter: blur(1px);
}

.jet-top {
  bottom: 50%;
  left: calc(50% - 3px);
  background: linear-gradient(to top, #ffffff 0%, #FCD34D 40%, #FF6B35 80%, transparent 100%);
  box-shadow: 0 0 16px 2px #FCD34D, 0 -10px 25px rgba(255, 107, 53, 0.7);
  transform-origin: bottom center;
  animation: jetPulseTop 1.5s ease-in-out infinite alternate;
}

.jet-bottom {
  top: 50%;
  left: calc(50% - 3px);
  background: linear-gradient(to bottom, #ffffff 0%, #FCD34D 40%, #FF6B35 80%, transparent 100%);
  box-shadow: 0 0 16px 2px #FCD34D, 0 10px 25px rgba(255, 107, 53, 0.7);
  transform-origin: top center;
  animation: jetPulseBottom 1.5s ease-in-out infinite alternate;
}

@keyframes jetPulseTop {
  0% { transform: scaleY(0.8) scaleX(0.9); opacity: 0.75; }
  100% { transform: scaleY(1.3) scaleX(1.1); opacity: 1; }
}

@keyframes jetPulseBottom {
  0% { transform: scaleY(0.8) scaleX(0.9); opacity: 0.75; }
  100% { transform: scaleY(1.3) scaleX(1.1); opacity: 1; }
}

/* 状态指标条 (保持位置结构不变) */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 24px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-lg);
}

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

.stat-value {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.85rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 4px;
  background: linear-gradient(135deg, #ffffff 0%, #FCD34D 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   区域通用标题与区块
   ========================================================================== */

.section {
  padding: 85px 0;
}

.section-alt {
  background-color: rgba(5, 5, 5, 0.6);
  border-top: 1px solid rgba(252, 211, 77, 0.08);
  border-bottom: 1px solid rgba(252, 211, 77, 0.08);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 54px;
}

.section-tag {
  color: var(--primary-yellow);
  font-family: 'Orbitron', sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  color: #fff;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
}

/* ==========================================================================
   核心优势 (3个图文卡片)
   ========================================================================== */

.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: 36px 30px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: 0 10px 30px rgba(255, 107, 53, 0.2);
}

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

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  background: rgba(252, 211, 77, 0.1);
  border: 1px solid rgba(252, 211, 77, 0.3);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-yellow);
  margin-bottom: 22px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   流媒体与 AI 支持图卡
   ========================================================================== */

.media-ai-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.media-ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  position: relative;
}

.media-ai-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.media-ai-badge {
  padding: 6px 12px;
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: rgba(252, 211, 77, 0.12);
  color: var(--primary-yellow);
  border: 1px solid rgba(252, 211, 77, 0.3);
}

.media-ai-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
}

.media-ai-desc {
  font-size: 0.94rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.service-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.service-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-sub);
  transition: all 0.2s ease;
}

.service-pill:hover {
  border-color: var(--primary-yellow);
  background: rgba(252, 211, 77, 0.08);
  color: #fff;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary-yellow);
  box-shadow: 0 0 8px var(--primary-yellow);
}

/* ==========================================================================
   套餐价格对比表
   ========================================================================== */

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card.popular {
  border-color: rgba(252, 211, 77, 0.55);
  background: linear-gradient(180deg, rgba(28, 22, 14, 0.95) 0%, rgba(14, 11, 8, 0.98) 100%);
  box-shadow: 0 0 35px rgba(252, 211, 77, 0.2);
  transform: translateY(-8px);
}

.pricing-ribbon {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #000;
  padding: 4px 16px;
  border-radius: var(--radius-btn);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  box-shadow: 0 0 16px var(--primary-yellow);
}

.plan-header {
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

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

.plan-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

.plan-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary-yellow);
}

.plan-amount {
  font-family: 'Orbitron', sans-serif;
  font-size: 2.8rem;
  font-weight: 900;
  color: #fff;
  line-height: 1;
}

.plan-period {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-left: 2px;
}

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

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

.plan-feature-item svg {
  color: var(--primary-yellow);
  flex-shrink: 0;
}

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

/* ==========================================================================
   用户评价
   ========================================================================== */

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  color: var(--primary-yellow);
  margin-bottom: 16px;
  letter-spacing: 2px;
  text-shadow: 0 0 10px rgba(252, 211, 77, 0.5);
}

.review-content {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 22px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #000;
  font-size: 1rem;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
}

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

/* ==========================================================================
   常见问题 (FAQ 6个)
   ========================================================================== */

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-item[open] {
  border-color: rgba(252, 211, 77, 0.45);
  background: rgba(20, 16, 12, 0.85);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-icon {
  transition: transform 0.25s ease;
  color: var(--primary-yellow);
  flex-shrink: 0;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

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

/* ==========================================================================
   底部 CTA 转化条
   ========================================================================== */

.bottom-cta {
  padding: 75px 0;
  background: radial-gradient(circle at 50% 50%, rgba(255, 107, 53, 0.15) 0%, rgba(0, 0, 0, 0.95) 75%);
  text-align: center;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

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

.bottom-cta-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 30px;
}

/* ==========================================================================
   页脚规范 (只保留4个标题，打开新页面展示)
   ========================================================================== */

.footer {
  background-color: var(--bg-primary);
  padding: 50px 0 40px;
  border-top: 1px solid rgba(252, 211, 77, 0.08);
}

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

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

.footer-link {
  color: var(--text-sub);
  font-size: 1.02rem;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.footer-link:hover {
  color: var(--primary-yellow);
  background: rgba(252, 211, 77, 0.06);
}

.footer-copyright {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
}

/* ==========================================================================
   子页面样式规范
   ========================================================================== */

.subpage-container {
  max-width: 860px;
  margin: 50px auto 90px;
  padding: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.subpage-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
  margin-bottom: 34px;
}

.subpage-title {
  font-family: 'Orbitron', -apple-system, sans-serif;
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}

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

.subpage-content h2 {
  font-size: 1.38rem;
  font-weight: 700;
  color: #f1f5f9;
  margin: 32px 0 14px;
}

.subpage-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #e2e8f0;
  margin: 20px 0 10px;
}

.subpage-content p {
  font-size: 0.98rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 16px;
}

.subpage-content ul, .subpage-content ol {
  margin: 0 0 20px 24px;
  color: var(--text-sub);
}

.subpage-content li {
  margin-bottom: 8px;
  font-size: 0.96rem;
  line-height: 1.7;
}

.info-box {
  background: rgba(252, 211, 77, 0.08);
  border-left: 4px solid var(--primary-yellow);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0;
}

.info-box p {
  margin: 0;
  color: #fef08a;
  font-size: 0.92rem;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px;
}

.sitemap-card h3 {
  margin-top: 0;
  color: #fff;
  font-size: 1.15rem;
  margin-bottom: 12px;
}

.sitemap-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sitemap-card li {
  margin-bottom: 8px;
}

.sitemap-card a {
  color: var(--text-sub);
  font-size: 0.92rem;
}

.sitemap-card a:hover {
  color: var(--primary-yellow);
  text-decoration: underline;
}

/* 知识科普专区扩展样式 */
.wiki-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(252, 211, 77, 0.12);
  border: 1px solid rgba(252, 211, 77, 0.3);
  color: var(--primary-yellow);
  padding: 4px 12px;
  border-radius: var(--radius-btn);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.wiki-toc {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 24px 0 32px;
}

.wiki-toc-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.wiki-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.wiki-toc a {
  color: var(--text-sub);
  font-size: 0.92rem;
  transition: all 0.2s ease;
}

.wiki-toc a:hover {
  color: var(--primary-yellow);
  padding-left: 4px;
}

.wiki-table-wrapper {
  overflow-x: auto;
  margin: 20px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.wiki-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

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

.wiki-table th {
  background: rgba(252, 211, 77, 0.06);
  color: #fff;
  font-weight: 600;
}

.wiki-table tr:hover td {
  background: rgba(252, 211, 77, 0.02);
}

/* ==========================================================================
   9 篇深度 SEO 文章专栏与目录系统
   ========================================================================== */

.seo-nav-section {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-bottom: 50px;
}

.seo-nav-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.seo-nav-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.seo-nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.seo-nav-card {
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(252, 211, 77, 0.12);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
  text-decoration: none;
}

.seo-nav-card:hover {
  border-color: var(--primary-yellow);
  transform: translateY(-3px);
  box-shadow: 0 4px 15px rgba(252, 211, 77, 0.15);
}

.seo-nav-badge {
  display: inline-block;
  font-size: 0.74rem;
  color: var(--secondary-orange);
  font-weight: 700;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.seo-nav-card-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.45;
  margin-bottom: 8px;
}

.seo-nav-card-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* 独立 SEO 文章卡片主体 */
.seo-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 42px 38px;
  margin-bottom: 46px;
  box-shadow: var(--shadow-lg);
  position: relative;
  transition: border-color 0.25s ease;
}

.seo-article-card:hover {
  border-color: rgba(252, 211, 77, 0.35);
}

.seo-article-header {
  border-bottom: 1px solid rgba(252, 211, 77, 0.12);
  padding-bottom: 22px;
  margin-bottom: 28px;
}

.seo-article-tag-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.article-cat-tag {
  background: rgba(252, 211, 77, 0.15);
  border: 1px solid rgba(252, 211, 77, 0.35);
  color: var(--primary-yellow);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
}

.article-word-count {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.seo-article-title {
  font-size: 1.65rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.35;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}

.seo-keyword-badge-list {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.keyword-badge {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.04);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

/* 正文样式排版 */
.seo-article-body h3 {
  font-size: 1.22rem;
  font-weight: 700;
  color: #fef08a;
  margin: 28px 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.seo-article-body p {
  font-size: 0.98rem;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 16px;
  text-align: justify;
}

.seo-article-body ul, .seo-article-body ol {
  margin: 0 0 18px 24px;
  color: var(--text-sub);
}

.seo-article-body li {
  margin-bottom: 8px;
  font-size: 0.95rem;
  line-height: 1.7;
}

.seo-article-body strong {
  color: #fff;
  font-weight: 700;
}

/* 站内核心内链高亮 */
.internal-link {
  color: var(--primary-yellow);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: all 0.2s ease;
}

.internal-link:hover {
  color: var(--secondary-orange);
  text-shadow: 0 0 10px rgba(255, 107, 53, 0.5);
}

/* 文章内部 FAQ 专属样式 */
.article-faq-wrapper {
  margin: 28px 0 16px;
  padding-top: 18px;
  border-top: 1px dashed rgba(252, 211, 77, 0.2);
}

.article-faq-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #FCD34D;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article-faq-wrapper .faq-item {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(252, 211, 77, 0.18);
  border-radius: var(--radius-sm);
}

.article-faq-wrapper .faq-item[open] {
  border-color: rgba(252, 211, 77, 0.45);
  background: rgba(22, 18, 12, 0.7);
}

.article-faq-wrapper .faq-question {
  padding: 14px 18px;
  font-size: 0.96rem;
  color: #fff;
}

.article-faq-wrapper .faq-answer {
  padding: 0 18px 16px;
  font-size: 0.91rem;
  color: var(--text-muted);
  line-height: 1.68;
}

/* 文章内置 CTA 条 */
.article-inline-cta {
  background: linear-gradient(135deg, rgba(28, 22, 14, 0.9) 0%, rgba(18, 14, 9, 0.95) 100%);
  border: 1px solid rgba(252, 211, 77, 0.3);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 28px 0 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.article-inline-cta-text h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.article-inline-cta-text p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

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

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

  .seo-article-card {
    padding: 26px 20px;
  }

  .seo-article-title {
    font-size: 1.35rem;
  }

  .article-inline-cta {
    flex-direction: column;
    text-align: center;
  }

  .article-inline-cta .btn {
    width: 100%;
  }
}

/* ==========================================================================
   响应式媒体查询 (@media) - 确保手机端完美单栏与大触控体验
   ========================================================================== */

@media (max-width: 992px) {
  .hero-main-layout {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-right-animation {
    margin: 20px auto 0;
  }

  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.popular {
    transform: none;
  }
}

@media (max-width: 768px) {
  .header .nav-menu {
    display: none;
  }

  .hero {
    padding: 45px 0 35px;
  }

  .hero-title {
    font-size: 2.5rem;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

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

  .hero-actions .btn {
    width: 100%;
  }

  .blackhole-container {
    width: 280px;
    height: 280px;
    transform: scale(0.85);
  }

  .hero-stats {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px;
  }

  .section {
    padding: 55px 0;
  }

  .section-title {
    font-size: 1.75rem;
  }

  /* 移动端单栏化 */
  .features-grid,
  .media-ai-container,
  .pricing-grid,
  .reviews-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feature-card,
  .media-ai-card,
  .pricing-card,
  .review-card {
    padding: 26px 20px;
  }

  .plan-amount {
    font-size: 2.3rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .subpage-container {
    padding: 24px 18px;
    margin: 20px auto 50px;
  }

  .subpage-title {
    font-size: 1.75rem;
  }

  .wiki-toc ul {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   无障碍：遵循用户系统级减弱动态效果偏好 (prefers-reduced-motion)
   ========================================================================== */
@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;
  }
}