/* ===================================================================
   ikuku云 占星科技 · 星座罗盘 · 天穹导航 视觉样式表
   配色规范：
   - 主背景：#020617 太空黑 (径向渐变到 #0A0E27)
   - 主色：#3B82F6 星图蓝
   - 次色：#FCD34D 星辰黄
   - 文字：#FFFFFF / rgba(255, 255, 255, 0.5)
   - CTA：圆角 8px，带 30px 蓝色辉光
   =================================================================== */

/* 本地原生字体族，零外部依赖，极速秒开 */


:root {
  --bg-space-dark: #020617;
  --bg-space-light: #0a0e27;
  --bg-card: rgba(10, 14, 39, 0.72);
  --bg-card-hover: rgba(18, 24, 61, 0.85);
  
  --star-blue: #3b82f6;
  --star-blue-glow: rgba(59, 130, 246, 0.5);
  --star-yellow: #fcd34d;
  --star-yellow-glow: rgba(252, 211, 77, 0.45);
  
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #60a5fa 50%, #fcd34d 100%);
  --btn-gradient: linear-gradient(135deg, #1d4ed8 0%, #3b82f6 60%, #60a5fa 100%);
  --btn-gradient-hover: linear-gradient(135deg, #2563eb 0%, #60a5fa 60%, #93c5fd 100%);
  
  --text-main: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.7);
  --text-sub: rgba(255, 255, 255, 0.85);
  
  --border-color: rgba(59, 130, 246, 0.18);
  --border-yellow: rgba(252, 211, 77, 0.25);
  --border-focus: rgba(59, 130, 246, 0.55);
  
  --card-shadow: 0 12px 36px -8px rgba(2, 6, 23, 0.8);
  --radius-btn: 8px; /* 用户规范：圆角 8px */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --container-max: 1200px;
}

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

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  /* 太空黑到深穹蓝径向渐变 */
  background: radial-gradient(circle at 50% 25%, var(--bg-space-light) 0%, var(--bg-space-dark) 85%);
  background-attachment: fixed;
}

/* ===================================================================
   背景动效：2 个大型蓝/黄 Blur 光晕缓慢呼吸缩放
   =================================================================== */
.celestial-halo {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(100px);
  opacity: 0.45;
  animation: haloBreathe 12s ease-in-out infinite alternate;
}

.celestial-halo-blue {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, #3b82f6 0%, transparent 70%);
  top: -100px;
  left: -80px;
}

.celestial-halo-yellow {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #fcd34d 0%, transparent 70%);
  bottom: 10%;
  right: -60px;
  animation-delay: -6s;
  opacity: 0.35;
}

@keyframes haloBreathe {
  0% {
    transform: scale(0.85) translate(0, 0);
    opacity: 0.3;
  }
  50% {
    transform: scale(1.15) translate(25px, 20px);
    opacity: 0.55;
  }
  100% {
    transform: scale(0.95) translate(-15px, 10px);
    opacity: 0.35;
  }
}

/* ===================================================================
   背景动效：120 颗白星闪烁 + 2 组星座连线 (蓝色虚线 + 黄色节点流动)
   =================================================================== */
.celestial-canvas-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 星星随机闪烁动画 */
@keyframes starTwinkle {
  0%, 100% { opacity: 0.2; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.3); filter: drop-shadow(0 0 3px #ffffff); }
}

.twinkle-fast { animation: starTwinkle 2.5s ease-in-out infinite; }
.twinkle-mid { animation: starTwinkle 4s ease-in-out infinite; }
.twinkle-slow { animation: starTwinkle 6s ease-in-out infinite; }
.twinkle-alt { animation: starTwinkle 5s ease-in-out infinite 2s; }

/* 星座连线流动动画 */
@keyframes constellationFlow {
  to {
    stroke-dashoffset: -120;
  }
}

.constellation-line {
  stroke: var(--star-blue);
  stroke-width: 1.5;
  stroke-dasharray: 6 6;
  fill: none;
  animation: constellationFlow 18s linear infinite;
  opacity: 0.65;
}

.constellation-node {
  fill: var(--star-yellow);
  filter: drop-shadow(0 0 5px rgba(252, 211, 77, 0.8));
  animation: starTwinkle 3s ease-in-out infinite;
}

/* 页面主要内容置于背景之上 */
header, main, footer {
  position: relative;
  z-index: 1;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

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

/* ===================================================================
   天穹导航栏 (Navbar)
   =================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(2, 6, 23, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  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: 'Orbitron', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #ffffff;
}

.brand-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--star-blue) 0%, var(--star-yellow) 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.6);
}

.brand-name {
  background: linear-gradient(135deg, #ffffff 0%, var(--star-yellow) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-family: 'Orbitron', sans-serif;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 4px 2px;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(59, 130, 246, 0.6);
}

.nav-link.badge-link::after {
  content: "科普";
  font-size: 0.68rem;
  font-weight: 800;
  background: rgba(252, 211, 77, 0.15);
  color: var(--star-yellow);
  border: 1px solid rgba(252, 211, 77, 0.4);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  margin-left: 5px;
  vertical-align: super;
}

.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* ===================================================================
   【CTA 按钮规范】
   - 蓝色渐变按钮
   - 圆角 8px
   - 带 30px 蓝色辉光
   - hover 时光晕扩大
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius-btn); /* 严格 8px 圆角 */
  cursor: pointer;
  border: none;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  white-space: nowrap;
  user-select: none;
}

.btn:active {
  transform: scale(0.98);
}

/* 核心 CTA 蓝色渐变 + 30px 辉光 + 8px 圆角 */
.btn-primary {
  background: var(--btn-gradient);
  color: #ffffff;
  border-radius: var(--radius-btn);
  box-shadow: 0 0 30px var(--star-blue-glow); /* 严格 30px 蓝色辉光 */
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background: var(--btn-gradient-hover);
  box-shadow: 0 0 45px rgba(59, 130, 246, 0.85); /* hover 光晕显著扩大 */
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-sub);
  border-radius: var(--radius-btn);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.12);
  color: #ffffff;
  border-color: var(--star-blue);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.05rem;
}

/* ===================================================================
   主视觉区 (Hero Layout)
   左侧：H1「ikuku云」Orbitron 800 字重，蓝到黄渐变 + 双层文字阴影 + 简介 + CTA
   右侧动画：320×320px 星座罗盘动画系统
   =================================================================== */
.hero-section {
  padding: 70px 0 65px;
  position: relative;
}

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

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

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-btn);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.35);
  color: var(--star-blue);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-pill-badge {
  background: var(--star-yellow);
  color: #020617;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 2px 7px;
  border-radius: 4px;
  font-family: 'Orbitron', sans-serif;
}

/* 大标题：H1「ikuku云」Orbitron 800，蓝到黄渐变 + 双层文字阴影 */
.hero-title {
  font-family: 'Orbitron', -apple-system, sans-serif;
  font-weight: 800;
  font-size: clamp(2.4rem, 4.8vw, 3.8rem);
  line-height: 1.18;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
  color: #ffffff;
}

.hero-title-brand {
  font-family: 'Orbitron', sans-serif;
  font-weight: 800;
  background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 45%, #fcd34d 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  /* 双层文字阴影：一层蓝色辉光 + 一层星辰黄辉光 */
  filter: drop-shadow(0 0 16px rgba(59, 130, 246, 0.7)) drop-shadow(0 0 35px rgba(252, 211, 77, 0.45));
}

.hero-title-sub {
  font-size: clamp(1.4rem, 2.8vw, 2.1rem);
  color: #ffffff;
  display: block;
  font-weight: 700;
  margin-top: 6px;
}

/* 主视觉区核心简介模块 */
.hero-intro-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 20px 24px;
  box-shadow: 0 10px 25px -5px rgba(2, 6, 23, 0.6);
  margin-bottom: 30px;
  backdrop-filter: blur(12px);
}

.hero-intro-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  color: var(--star-yellow);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.hero-intro-text {
  font-size: 1.02rem;
  color: var(--text-sub);
  line-height: 1.7;
}

.hero-intro-text strong {
  color: #ffffff;
}

.hero-cta-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.hero-guarantees {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.guarantee-icon {
  color: var(--star-yellow);
}

/* ===================================================================
   【右侧动画：320×320px 星座罗盘系统 (Astrological Compass)】
   - 外层 320×320px 罗盘圆环（12 刻度，蓝色边框，30 秒旋转）
   - 中层 260×260px 虚线圆环（黄色，20 秒反向旋转）
   - 内层 200×200px 实线圆环（蓝色，15 秒旋转）
   - 中心 2 根指针（黄色 140px 8秒摆动 + 蓝色 100px 6秒摆动）
   - 指针中心 60×60px 蓝黄径向渐变能量球（3秒脉冲呼吸）
   - 罗盘周围 4 个黄/蓝星辰节点闪烁（2秒周期）
   =================================================================== */
.compass-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  height: 380px;
}

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

/* 外层罗盘圆环：320×320px，带 12 个刻度，蓝色边框，30 秒一周期旋转 */
.compass-ring-outer {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 2px solid var(--star-blue);
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.4), inset 0 0 20px rgba(59, 130, 246, 0.2);
  animation: compassRotateClockwise 30s linear infinite;
}

/* 12 个刻度标记 */
.compass-ticks {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.compass-tick {
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 10px;
  background: var(--star-blue);
  transform-origin: 50% 160px;
}

.compass-tick:nth-child(3n+1) {
  height: 16px;
  width: 3px;
  background: var(--star-yellow);
  box-shadow: 0 0 6px var(--star-yellow);
}

/* 中层：260×260px 虚线圆环，黄色，20 秒反向旋转 */
.compass-ring-mid {
  position: absolute;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  border: 2px dashed var(--star-yellow);
  box-shadow: 0 0 18px rgba(252, 211, 77, 0.35);
  animation: compassRotateCounter 20s linear infinite;
}

/* 内层：200×200px 实线圆环，蓝色，15 秒旋转 */
.compass-ring-inner {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 2px solid var(--star-blue);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
  animation: compassRotateClockwise 15s linear infinite;
}

/* 中心 2 根指针 */
/* 黄色主指针 140px，8 秒摆动旋转（罗盘寻北效果） */
.compass-needle-yellow {
  position: absolute;
  width: 4px;
  height: 140px;
  background: linear-gradient(to top, transparent 0%, var(--star-yellow) 70%, #ffffff 100%);
  border-radius: 2px;
  transform-origin: 50% 100%;
  top: calc(50% - 140px);
  left: calc(50% - 2px);
  filter: drop-shadow(0 0 8px var(--star-yellow));
  animation: needleSwingYellow 8s ease-in-out infinite;
  z-index: 5;
}

/* 蓝色副指针 100px，6 秒摆动旋转 */
.compass-needle-blue {
  position: absolute;
  width: 3px;
  height: 100px;
  background: linear-gradient(to top, transparent 0%, var(--star-blue) 75%, #ffffff 100%);
  border-radius: 2px;
  transform-origin: 50% 100%;
  top: calc(50% - 100px);
  left: calc(50% - 1.5px);
  filter: drop-shadow(0 0 8px var(--star-blue));
  animation: needleSwingBlue 6s ease-in-out infinite;
  z-index: 4;
}

/* 指针中心 60×60px 蓝黄径向渐变能量球（脉冲呼吸 3 秒一周期） */
.compass-core-orb {
  position: absolute;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #ffffff 0%, var(--star-yellow) 30%, var(--star-blue) 75%, #020617 100%);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.8), 0 0 15px rgba(252, 211, 77, 0.6);
  z-index: 6;
  animation: orbPulse 3s ease-in-out infinite;
}

/* 罗盘周围 4 个黄/蓝星辰节点闪烁（2 秒一周期） */
.compass-star-node {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  animation: starNodeBlink 2s ease-in-out infinite;
  z-index: 7;
}

.node-top {
  top: -18px;
  left: calc(50% - 6px);
  background: var(--star-yellow);
  box-shadow: 0 0 14px var(--star-yellow);
}

.node-bottom {
  bottom: -18px;
  left: calc(50% - 6px);
  background: var(--star-blue);
  box-shadow: 0 0 14px var(--star-blue);
  animation-delay: -1s;
}

.node-left {
  left: -18px;
  top: calc(50% - 6px);
  background: var(--star-blue);
  box-shadow: 0 0 14px var(--star-blue);
  animation-delay: -0.5s;
}

.node-right {
  right: -18px;
  top: calc(50% - 6px);
  background: var(--star-yellow);
  box-shadow: 0 0 14px var(--star-yellow);
  animation-delay: -1.5s;
}

/* 罗盘动效帧定义 */
@keyframes compassRotateClockwise {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

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

@keyframes needleSwingYellow {
  0%   { transform: rotate(-35deg); }
  25%  { transform: rotate(45deg); }
  50%  { transform: rotate(15deg); }
  75%  { transform: rotate(-50deg); }
  100% { transform: rotate(-35deg); }
}

@keyframes needleSwingBlue {
  0%   { transform: rotate(60deg); }
  33%  { transform: rotate(-40deg); }
  66%  { transform: rotate(20deg); }
  100% { transform: rotate(60deg); }
}

@keyframes orbPulse {
  0%, 100% {
    transform: scale(0.92);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.6), 0 0 10px rgba(252, 211, 77, 0.4);
  }
  50% {
    transform: scale(1.08);
    box-shadow: 0 0 40px rgba(59, 130, 246, 0.95), 0 0 25px rgba(252, 211, 77, 0.85);
  }
}

@keyframes starNodeBlink {
  0%, 100% { opacity: 0.3; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.3); }
}

/* ===================================================================
   产品核心优势介绍 (3个图文卡片)
   =================================================================== */
.section {
  padding: 80px 0;
}

.section-alt {
  background: rgba(10, 14, 39, 0.45);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-badge {
  display: inline-block;
  color: var(--star-yellow);
  font-family: 'Orbitron', sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.02rem;
  max-width: 620px;
  margin: 0 auto;
}

.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-btn);
  padding: 36px 30px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(10px);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--star-blue);
  transform: translateY(-5px);
  box-shadow: var(--card-shadow), 0 0 25px rgba(59, 130, 246, 0.25);
}

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-btn);
  background: rgba(59, 130, 246, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--star-blue);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.feature-card:nth-child(2) .feature-icon-wrapper {
  background: rgba(252, 211, 77, 0.12);
  color: var(--star-yellow);
  border-color: rgba(252, 211, 77, 0.3);
}

.feature-card:nth-child(3) .feature-icon-wrapper {
  background: rgba(96, 165, 250, 0.12);
  color: #60a5fa;
  border-color: rgba(96, 165, 250, 0.3);
}

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

.feature-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-highlights {
  list-style: none;
  border-top: 1px solid var(--border-color);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-highlights li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-sub);
  font-size: 0.88rem;
}

.feature-highlights li svg {
  color: var(--star-yellow);
  flex-shrink: 0;
}

/* ===================================================================
   流媒体与 AI 支持图卡
   =================================================================== */
.media-ai-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.media-ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 36px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease;
  backdrop-filter: blur(10px);
}

.media-ai-card:hover {
  transform: translateY(-4px);
  border-color: var(--star-blue);
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.2);
}

.media-ai-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--star-blue), var(--star-yellow));
}

.media-ai-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.media-ai-tag {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-btn);
  background: rgba(59, 130, 246, 0.15);
  color: var(--star-blue);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.media-ai-title {
  font-size: 1.35rem;
  font-weight: 700;
}

.media-ai-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 24px;
}

.service-badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 12px;
}

.service-badge {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-sub);
  transition: all 0.2s ease;
}

.service-badge:hover {
  background: rgba(59, 130, 246, 0.12);
  border-color: var(--star-blue);
  color: #ffffff;
  transform: translateY(-2px);
}

.service-badge-icon {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ===================================================================
   套餐价格对比表 (保持栅格与排版，应用星图蓝/星辰黄/8px圆角)
   =================================================================== */
.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-btn);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
  backdrop-filter: blur(12px);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(10, 14, 39, 0.95) 0%, rgba(20, 28, 77, 0.95) 100%);
  border-color: var(--star-yellow);
  box-shadow: 0 15px 35px -5px rgba(252, 211, 77, 0.2);
  transform: scale(1.03);
}

.pricing-card:hover {
  transform: translateY(-5px);
  border-color: var(--star-blue);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-5px);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--star-blue) 0%, var(--star-yellow) 100%);
  color: #020617;
  padding: 4px 18px;
  font-size: 0.8rem;
  font-weight: 800;
  border-radius: var(--radius-btn);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 14px rgba(252, 211, 77, 0.4);
}

.pricing-name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

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

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

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

.pricing-amount {
  font-family: 'Orbitron', sans-serif;
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: #ffffff;
}

.pricing-cycle {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-left: 4px;
}

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

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

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

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

/* ===================================================================
   用户真实评价 (Reviews)
   =================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease;
  backdrop-filter: blur(10px);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--star-blue);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.review-rating {
  display: flex;
  gap: 4px;
  color: var(--star-yellow);
  margin-bottom: 14px;
  font-size: 1.05rem;
}

.review-content {
  color: var(--text-sub);
  font-size: 0.94rem;
  line-height: 1.65;
  margin-bottom: 22px;
  font-style: italic;
}

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

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--star-blue) 0%, var(--star-yellow) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: #020617;
  flex-shrink: 0;
}

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

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

/* ===================================================================
   6个常见问题解答 (FAQ)
   =================================================================== */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  overflow: hidden;
  transition: border-color 0.2s ease;
  backdrop-filter: blur(10px);
}

.faq-item[open] {
  border-color: var(--star-blue);
}

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

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

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--star-yellow);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 24px 22px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 14px;
}

/* 底部 CTA 条 */
.bottom-cta-box {
  background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.25) 0%, rgba(10, 14, 39, 0.95) 100%);
  border: 1px solid var(--star-blue);
  border-radius: var(--radius-btn);
  padding: 60px 30px;
  text-align: center;
  margin-top: 30px;
  box-shadow: 0 0 40px rgba(59, 130, 246, 0.3);
}

.bottom-cta-title {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 14px;
}

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

/* ===================================================================
   页脚 (规范：只保留这4个标题，新窗口展示)
   =================================================================== */
.footer {
  margin-top: auto;
  background: #020617;
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.footer-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-sub);
  padding: 6px 10px;
  border-radius: var(--radius-btn);
  transition: all 0.2s ease;
}

.footer-link:hover {
  color: var(--star-yellow);
  background: rgba(252, 211, 77, 0.08);
  text-shadow: 0 0 10px rgba(252, 211, 77, 0.5);
}

.footer-copyright {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.86rem;
}

/* 子页面文章通用 */
.subpage-header {
  padding: 60px 0 36px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(10, 14, 39, 0.6);
}

.subpage-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--star-yellow);
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 20px;
}

.subpage-back:hover {
  text-decoration: underline;
}

.article-body {
  max-width: 860px;
  margin: 48px auto 80px;
  color: var(--text-sub);
  line-height: 1.8;
  font-size: 1.02rem;
}

.article-body h2 {
  font-size: 1.6rem;
  color: #ffffff;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  color: var(--star-yellow);
  margin: 24px 0 12px;
}

.article-body p {
  margin-bottom: 16px;
  color: var(--text-sub);
}

.article-body ul, .article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.highlight-box {
  background: rgba(59, 130, 246, 0.1);
  border-left: 4px solid var(--star-blue);
  padding: 16px 20px;
  border-radius: 0 var(--radius-btn) var(--radius-btn) 0;
  margin: 24px 0;
  color: var(--text-main);
}

.danger-box {
  background: rgba(239, 68, 68, 0.1);
  border-left: 4px solid #ef4444;
  padding: 16px 20px;
  border-radius: 0 var(--radius-btn) var(--radius-btn) 0;
  margin: 24px 0;
  color: #fca5a5;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 30px;
}

.sitemap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 28px;
  backdrop-filter: blur(10px);
}

.sitemap-card h3 {
  font-size: 1.2rem;
  color: var(--star-yellow);
  margin-bottom: 16px;
  border: none;
  padding: 0;
}

.sitemap-links {
  list-style: none;
  padding: 0;
}

.sitemap-links li {
  margin-bottom: 12px;
}

.sitemap-links a {
  color: var(--text-sub);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color 0.2s ease;
}

.sitemap-links a:hover {
  color: #ffffff;
  text-decoration: underline;
}

/* ===================================================================
   知识科普 SEO 9 篇专栏卡片与快速目录样式
   =================================================================== */
.seo-toc-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--star-yellow);
  border-radius: var(--radius-btn);
  padding: 24px 28px;
  margin: 32px 0 48px;
  backdrop-filter: blur(12px);
}

.seo-toc-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--star-yellow);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.seo-toc-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 20px;
  list-style: none;
  padding: 0;
}

.seo-toc-list li a {
  color: var(--text-sub);
  font-size: 0.93rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.seo-toc-list li a:hover {
  color: var(--star-yellow);
  transform: translateX(4px);
}

.seo-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 38px 36px;
  margin-bottom: 40px;
  box-shadow: 0 10px 30px -10px rgba(2, 6, 23, 0.7);
  backdrop-filter: blur(12px);
  position: relative;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.seo-article-card:hover {
  border-color: var(--star-blue);
  box-shadow: 0 12px 35px -8px rgba(59, 130, 246, 0.2);
}

.seo-article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.seo-badge-pill {
  background: rgba(59, 130, 246, 0.15);
  color: var(--star-blue);
  border: 1px solid rgba(59, 130, 246, 0.35);
  padding: 2px 10px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.78rem;
}

.seo-article-title {
  font-size: 1.55rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.4;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.seo-article-content {
  color: var(--text-sub);
  font-size: 1rem;
  line-height: 1.85;
}

.seo-article-content h3 {
  font-size: 1.25rem;
  color: var(--star-yellow);
  margin: 24px 0 10px;
  font-weight: 700;
}

.seo-article-content p {
  margin-bottom: 14px;
}

.seo-article-content ul, .seo-article-content ol {
  margin-bottom: 18px;
  padding-left: 22px;
}

.seo-article-content li {
  margin-bottom: 6px;
}

.seo-article-content strong {
  color: #ffffff;
}

.seo-inlink {
  color: var(--star-yellow);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

.seo-inlink:hover {
  color: #ffffff;
  text-shadow: 0 0 10px var(--star-yellow);
}

.seo-article-action {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

/* 9篇文章内部专有 FAQ 模块样式 */
.article-faq-box {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px dashed var(--border-color);
}

.article-faq-heading {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--star-yellow);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-faq-box .faq-item {
  margin-bottom: 12px;
  background: rgba(2, 6, 23, 0.55);
  border: 1px solid var(--border-color);
}

.article-faq-box .faq-item[open] {
  border-color: rgba(59, 130, 246, 0.45);
}

.article-faq-box .faq-summary {
  font-size: 0.96rem;
  padding: 14px 18px;
  color: #ffffff;
}

.article-faq-box .faq-answer {
  padding: 0 18px 16px 18px;
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ===================================================================
   响应式媒体查询 (@media) - 手机端单栏，按钮适配点击
   =================================================================== */
@media (max-width: 1024px) {
  .hero-layout-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

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

  .hero-cta-group,
  .hero-guarantees {
    justify-content: center;
  }

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

  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-5px);
  }
}

@media (max-width: 860px) {
  .nav-links {
    display: none;
  }
}

@media (max-width: 768px) {
  .hero-section {
    padding: 46px 0 36px;
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-cta-group .btn {
    width: 100%;
    padding: 16px 24px;
    font-size: 1.1rem;
  }

  .features-grid,
  .media-ai-container,
  .pricing-grid,
  .reviews-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

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

  .footer-link {
    font-size: 1.1rem;
    padding: 10px;
  }

  .compass-wrapper {
    height: 330px;
    transform: scale(0.9);
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand-logo {
    font-size: 1.2rem;
  }

  .compass-wrapper {
    transform: scale(0.82);
    height: 290px;
  }

  .service-badges-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================================================
   无障碍与 SEO 规范增强 (Accessibility & SEO Standards)
   =================================================================== */

/* 1. 键盘可访问性：主要内容跳跃链接 (Skip Link) */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--star-yellow);
  color: #020617;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  font-weight: 700;
  font-size: 0.95rem;
  z-index: 99999;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(252, 211, 77, 0.5);
  transition: top 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.skip-link:focus {
  top: 16px;
  outline: 3px solid var(--star-blue);
  outline-offset: 2px;
}

/* 2. 交互元素清晰键盘焦点样式 (:focus-visible) */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--star-yellow);
  outline-offset: 3px;
  box-shadow: 0 0 10px var(--star-yellow-glow);
}

/* 3. 固定导航栏锚点滚动防遮挡 (scroll-margin-top) */
section[id],
article[id],
div[id] {
  scroll-margin-top: 88px;
}

/* 4. 辅助技术专有隐藏类 (.sr-only) */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* 5. 套餐对比表语义增强与响应式横向滚动容器 */
.pricing-table-container {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.pricing-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}
.pricing-grid-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}
@media (max-width: 900px) {
  .pricing-grid-row {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* 6. 减弱动态效果媒体查询 (prefers-reduced-motion) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .compass-outer,
  .compass-middle,
  .compass-inner,
  .pointer-yellow,
  .pointer-blue,
  .compass-orb,
  .star-node,
  .glow-orb-1,
  .glow-orb-2,
  .star {
    animation: none !important;
  }
}