/* ==========================================================================
   寰宇云 (Huanyuyun) - 宇宙星系风格 & 反重力特效样式表
   极简原生 CSS，秒开级加载，无外部重型依赖
   ========================================================================== */

:root {
  /* 宇宙星系调色板 */
  --space-deep: #05070e;
  --space-card: rgba(16, 22, 43, 0.75);
  --space-card-hover: rgba(26, 35, 68, 0.88);
  --space-border: rgba(99, 125, 230, 0.22);
  --space-border-glow: rgba(0, 242, 254, 0.45);
  
  /* 星云与反重力光效 */
  --stellar-cyan: #00f2fe;
  --stellar-blue: #4facfe;
  --nebula-purple: #9d4edd;
  --nebula-pink: #f72585;
  --starlight-gold: #ffd166;
  
  /* 文本高对比度规范 (> 4.5:1) */
  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --text-dim: #94a3b8;
  
  /* 尺寸与间距 */
  --container-max: 1200px;
  --header-height: 72px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --transition-normal: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--space-deep);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(79, 172, 254, 0.18), transparent 70%),
    radial-gradient(circle 600px at 85% 30%, rgba(157, 78, 221, 0.15), transparent 70%),
    radial-gradient(circle 500px at 15% 70%, rgba(0, 242, 254, 0.12), transparent 60%),
    radial-gradient(circle 400px at 70% 90%, rgba(247, 37, 133, 0.08), transparent 60%),
    var(--space-deep);
}

/* 宇宙星系微粒与反重力背景层 (纯原生 CSS 绘制) */
.galaxy-canvas-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  background-image: 
    radial-gradient(1px 1px at 20px 30px, #ffffff, rgba(0,0,0,0)),
    radial-gradient(1.5px 1.5px at 100px 150px, #00f2fe, rgba(0,0,0,0)),
    radial-gradient(1px 1px at 220px 80px, #ffd166, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 350px 240px, #ffffff, rgba(0,0,0,0)),
    radial-gradient(1.5px 1.5px at 500px 380px, #9d4edd, rgba(0,0,0,0)),
    radial-gradient(1px 1px at 700px 120px, #ffffff, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 850px 310px, #4facfe, rgba(0,0,0,0)),
    radial-gradient(1.5px 1.5px at 1020px 180px, #ffffff, rgba(0,0,0,0)),
    radial-gradient(1px 1px at 1180px 420px, #ffd166, rgba(0,0,0,0));
  background-repeat: repeat;
  background-size: 1200px 600px;
  opacity: 0.75;
  animation: cosmicDrift 120s linear infinite;
}

/* 反重力浮动动画 */
@keyframes antigravityFloat {
  0% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-12px) rotate(0.8deg);
  }
  100% {
    transform: translateY(0px) rotate(0deg);
  }
}

@keyframes antigravityFloatSlow {
  0% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-18px) rotate(-1.2deg);
  }
  100% {
    transform: translateY(0px) rotate(0deg);
  }
}

@keyframes cosmicDrift {
  from { background-position: 0 0; }
  to { background-position: 1200px 600px; }
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 25px rgba(0, 242, 254, 0.25), inset 0 0 15px rgba(157, 78, 221, 0.15);
  }
  50% {
    box-shadow: 0 0 45px rgba(0, 242, 254, 0.45), inset 0 0 25px rgba(157, 78, 221, 0.3);
  }
}

.antigravity-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
  opacity: 0.4;
  animation: antigravityFloatSlow 10s ease-in-out infinite;
}

.orb-1 {
  top: 15%;
  left: 5%;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, var(--stellar-cyan), transparent);
}

.orb-2 {
  top: 40%;
  right: 8%;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, var(--nebula-purple), transparent);
  animation-duration: 14s;
  animation-delay: -3s;
}

/* 无障碍跳过链接 */
.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  background: var(--stellar-cyan);
  color: #000;
  padding: 10px 18px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  z-index: 9999;
  transition: top 0.2s ease;
  text-decoration: none;
}
.skip-link:focus {
  top: 16px;
  outline: 3px solid #fff;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 锚点滚动补偿 (防止固定导航遮挡) */
section[id], h2[id], div[id] {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* 页眉与导航 */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(5, 7, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--space-border);
  z-index: 100;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.brand-icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--stellar-cyan), var(--nebula-purple));
  border-radius: 10px;
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.4);
}

.brand-icon svg {
  width: 20px;
  height: 20px;
  fill: #fff;
}

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

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-normal);
  padding: 8px 0;
  position: relative;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--stellar-cyan);
}

.nav-links a.active {
  color: var(--stellar-cyan);
  font-weight: 600;
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--stellar-cyan);
  border-radius: 2px;
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  background: linear-gradient(135deg, var(--stellar-cyan), var(--stellar-blue));
  color: #040814;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 18px rgba(0, 242, 254, 0.35);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.nav-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 242, 254, 0.55);
}

/* 按钮规范 (符合最小44px点击尺寸与高对比度) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  min-width: 140px;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
  line-height: 1.2;
}

.btn-primary {
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #7928ca 100%);
  color: #040814;
  box-shadow: 0 4px 22px rgba(0, 242, 254, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 30px rgba(0, 242, 254, 0.6);
  color: #000;
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--space-border-glow);
  color: var(--text-main);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  background: rgba(0, 242, 254, 0.12);
  border-color: var(--stellar-cyan);
  color: #fff;
  transform: translateY(-2px);
}

/* 主视觉区 (Hero Section) - 宇宙反重力震撼感 */
.hero-section {
  padding: 90px 0 70px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(99, 125, 230, 0.15);
  border: 1px solid var(--space-border-glow);
  border-radius: 999px;
  color: var(--stellar-cyan);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
  animation: antigravityFloat 5s ease-in-out infinite;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--stellar-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--stellar-cyan);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 20%, #00f2fe 60%, #b388ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-guarantee {
  display: flex;
  justify-content: center;
  gap: 32px;
  font-size: 0.9rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}

.hero-guarantee span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-guarantee svg {
  width: 16px;
  height: 16px;
  fill: var(--stellar-cyan);
}

/* 反重力星系视觉卡片浮动展示 */
.hero-visual-card {
  margin-top: 50px;
  background: linear-gradient(180deg, rgba(22, 30, 60, 0.7) 0%, rgba(10, 14, 30, 0.85) 100%);
  border: 1px solid var(--space-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  animation: antigravityFloatSlow 7s ease-in-out infinite;
  position: relative;
  overflow: hidden;
}

.hero-visual-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20%;
  right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--stellar-cyan), transparent);
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.status-item {
  padding: 16px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.status-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--stellar-cyan);
  display: block;
}

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

/* 通用板块样式 */
.section-block {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-tag {
  color: var(--stellar-cyan);
  font-size: 0.88rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  line-height: 1.3;
}

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

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

.feature-card {
  background: var(--space-card);
  border: 1px solid var(--space-border);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  position: relative;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--space-border-glow);
  box-shadow: 0 16px 40px rgba(0, 242, 254, 0.15);
  background: var(--space-card-hover);
}

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.2), rgba(157, 78, 221, 0.2));
  border: 1px solid var(--space-border-glow);
}

.feature-icon-wrapper svg {
  width: 32px;
  height: 32px;
  fill: var(--stellar-cyan);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #fff;
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.7;
}

/* 流媒体与 AI 支持图卡 */
.streaming-ai-card {
  background: linear-gradient(135deg, rgba(22, 28, 56, 0.85) 0%, rgba(13, 17, 36, 0.95) 100%);
  border: 1px solid var(--space-border-glow);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.streaming-info h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: #fff;
}

.streaming-info p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 24px;
}

.support-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.support-tag {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-main);
}

.streaming-visual-box {
  background: rgba(8, 12, 25, 0.6);
  border: 1px solid var(--space-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.service-badge {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.service-badge svg {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
}

.service-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: #fff;
}

.service-status {
  font-size: 0.75rem;
  color: #10b981;
}

/* 套餐价格对比表 (规范的语义化 Table) */
.pricing-wrapper {
  background: var(--space-card);
  border: 1px solid var(--space-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  overflow-x: auto;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.pricing-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
  min-width: 720px;
}

.pricing-table caption {
  caption-side: top;
  text-align: left;
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-main);
}

.pricing-table th,
.pricing-table td {
  padding: 18px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.pricing-table thead th {
  background: rgba(255, 255, 255, 0.04);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--stellar-cyan);
}

.pricing-table thead th:first-child {
  border-top-left-radius: var(--radius-sm);
}

.pricing-table thead th:last-child {
  border-top-right-radius: var(--radius-sm);
}

.pricing-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

.pricing-table tbody td {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.plan-name-cell {
  font-weight: 700;
  color: #fff !important;
  font-size: 1.05rem !important;
}

.plan-badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  margin-left: 8px;
  background: linear-gradient(135deg, var(--nebula-purple), var(--nebula-pink));
  color: #fff;
}

.price-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--starlight-gold);
}

/* 用户评价 (Testimonials) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--space-card);
  border: 1px solid var(--space-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  color: var(--starlight-gold);
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 14px;
}

.user-avatar-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--stellar-cyan), var(--nebula-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 0.9rem;
}

.user-meta-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: #fff;
}

.user-meta-role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* 底部常见问题解答 (FAQ) - details/summary 默认展开，无依赖原生实现 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: var(--space-card);
  border: 1px solid var(--space-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: border-color var(--transition-normal);
}

.faq-item[open] {
  border-color: var(--space-border-glow);
  background: var(--space-card-hover);
}

.faq-question {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

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

.faq-question::after {
  content: "−";
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--stellar-cyan);
  transition: transform 0.2s ease;
}

.faq-item:not([open]) .faq-question::after {
  content: "+";
}

.faq-answer {
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 12px;
}

.faq-answer a {
  color: var(--stellar-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 页脚 (只保留四个指定标题并新窗口打开) */
.site-footer {
  background: rgba(3, 5, 10, 0.95);
  border-top: 1px solid var(--space-border);
  padding: 60px 0 40px;
  margin-top: 60px;
  position: relative;
  z-index: 10;
}

.footer-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 40px;
}

.footer-brand-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}

.footer-brand-desc {
  color: var(--text-dim);
  font-size: 0.92rem;
  max-width: 600px;
  line-height: 1.6;
}

.footer-nav-list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  list-style: none;
  padding: 24px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.footer-nav-list a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 600;
  transition: color var(--transition-normal);
  padding: 8px 12px;
}

.footer-nav-list a:hover,
.footer-nav-list a:focus-visible {
  color: var(--stellar-cyan);
  text-decoration: underline;
}

.footer-bottom {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* 文章详情页与知识科普页专属样式 */
.article-header {
  padding: 60px 0 30px;
  text-align: center;
}

.article-meta-info {
  display: flex;
  justify-content: center;
  gap: 20px;
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-top: 16px;
  margin-bottom: 30px;
}

.article-content {
  background: var(--space-card);
  border: 1px solid var(--space-border);
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  max-width: 860px;
  margin: 0 auto 50px;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #e2e8f0;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  margin: 36px 0 16px;
  border-left: 4px solid var(--stellar-cyan);
  padding-left: 14px;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #f1f5f9;
  margin: 26px 0 12px;
}

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

.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
}

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

.article-content a {
  color: var(--stellar-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.12), rgba(157, 78, 221, 0.12));
  border: 1px solid var(--space-border-glow);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  margin: 36px 0;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--space-card);
  border: 1px solid var(--space-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--stellar-cyan);
  box-shadow: 0 12px 30px rgba(0, 242, 254, 0.15);
}

.article-card-title {
  color: #fff;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-card-excerpt {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.article-card-more {
  color: var(--stellar-cyan);
  font-size: 0.88rem;
  font-weight: 600;
}

/* 响应式媒体查询 (360px, 390px, 768px, 1440px) */
@media (max-width: 1024px) {
  .features-grid,
  .reviews-grid,
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .streaming-ai-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* 移动端可精简导航或折叠 */
  }
  .site-header {
    height: 64px;
  }
  .hero-section {
    padding: 60px 0 40px;
  }
  .features-grid,
  .reviews-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }
  .status-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .btn {
    width: 100%;
  }
  .article-content {
    padding: 24px 20px;
  }
  .footer-nav-list {
    flex-direction: column;
    gap: 16px;
  }
}

@media (max-width: 390px) {
  .container {
    padding: 0 16px;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .status-grid {
    grid-template-columns: 1fr;
  }
}

/* 减弱动画无障碍模式 */
@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;
  }
  .galaxy-canvas-bg,
  .antigravity-orb,
  .hero-badge,
  .hero-visual-card {
    animation: none !important;
  }
}