/* GameHub 官网样式 - 深色游戏风 紫色强调 */
:root {
  --bg: #0f1117;
  --bg-2: #1a0b2e;
  --bg-3: #2d1247;
  --card: #1a1d2e;
  --card-hover: #232740;
  --border: #2d3252;
  --text: #e8eaf0;
  --text-dim: #a8aecd;
  --text-mute: #6b7088;
  --accent: #a855f7;
  --accent-2: #c084fc;
  --accent-3: #7c3aed;
  --accent-glow: rgba(168, 85, 247, 0.4);
  --success: #22c55e;
  --warning: #f59e0b;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 8px 40px rgba(168, 85, 247, 0.25);
  --max-width: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--accent-2); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent); }

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 顶部导航 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.logo:hover { color: var(--text); }
.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent-3), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px var(--accent-glow);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  color: var(--text-dim);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--accent-2); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-3), var(--accent));
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: #fff;
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: var(--card);
  border-color: var(--accent);
  color: var(--text);
}
.btn-lg { padding: 16px 32px; font-size: 16px; }

/* ===== Hero 区 ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url("assets/hero-bg.jpg") center/cover no-repeat;
  opacity: 0.5;
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15,17,23,0.4) 0%, var(--bg) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 880px;
}
.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #fff 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-dim);
  margin-bottom: 40px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin-top: 64px;
  flex-wrap: wrap;
}
.stat .num {
  font-size: 36px;
  font-weight: 800;
  color: var(--accent-2);
}
.stat .label {
  font-size: 14px;
  color: var(--text-mute);
}

/* ===== 通用区块 ===== */
.section {
  padding: 96px 0;
}
.section-alt { background: var(--bg-2); }
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px;
}
.section-tag {
  display: inline-block;
  color: var(--accent-2);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-head h2 {
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}
.section-head p {
  font-size: 17px;
  color: var(--text-dim);
}

/* ===== 特性卡片网格 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  background: var(--card-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-3), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}
.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}
.feature-card p {
  color: var(--text-dim);
  font-size: 15px;
}

/* ===== 截图展示 ===== */
.shots {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  max-width: 960px;
  margin: 0 auto;
}
.shot {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}
.shot:hover { transform: scale(1.01); }
.shot img { width: 100%; display: block; }
.shot-caption {
  padding: 16px 20px;
  background: var(--card);
  color: var(--text-dim);
  font-size: 14px;
  border-top: 1px solid var(--border);
}

/* ===== 步骤 ===== */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
  max-width: 960px;
  margin: 0 auto;
  counter-reset: step;
}
.step {
  text-align: center;
  position: relative;
}
.step-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-3), var(--accent));
  color: #fff;
  font-size: 24px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 0 30px var(--accent-glow);
}
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--text-dim); font-size: 14px; }

/* ===== 平台支持 ===== */
.platforms {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}
.platform-tag {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
}
.platform-tag .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

/* ===== CTA ===== */
.cta {
  background: linear-gradient(135deg, var(--bg-2), var(--bg-3));
  border-radius: 24px;
  padding: 64px 48px;
  text-align: center;
  margin: 0 24px;
  border: 1px solid var(--accent-3);
  box-shadow: var(--shadow-glow);
}
.cta h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 16px;
}
.cta p { color: var(--text-dim); margin-bottom: 32px; font-size: 17px; }

/* ===== 页面通用 ===== */
.page-head {
  padding: 140px 0 64px;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-2) 0%, var(--bg) 100%);
}
.page-head h1 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  margin-bottom: 16px;
}
.page-head p {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto;
}

/* ===== 功能详情页 ===== */
.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
}
.feature-detail:nth-child(even) .feature-detail-text { order: 2; }
.feature-detail-text h3 {
  font-size: 28px;
  margin-bottom: 16px;
}
.feature-detail-text p {
  color: var(--text-dim);
  margin-bottom: 16px;
  font-size: 16px;
}
.feature-detail-text ul {
  list-style: none;
  padding: 0;
}
.feature-detail-text li {
  padding: 8px 0 8px 28px;
  position: relative;
  color: var(--text-dim);
}
.feature-detail-text li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-2);
  font-weight: 700;
}
.feature-detail-img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

/* ===== 下载页 ===== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}
.download-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  transition: all 0.3s;
}
.download-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.download-card .platform-icon {
  font-size: 48px;
  margin-bottom: 16px;
}
.download-card h3 { font-size: 22px; margin-bottom: 8px; }
.download-card .ver { color: var(--text-mute); font-size: 14px; margin-bottom: 20px; }
.download-card .size { color: var(--text-dim); font-size: 13px; margin-top: 12px; }

.changelog {
  max-width: 800px;
  margin: 80px auto 0;
}
.changelog h2 { text-align: center; margin-bottom: 40px; font-size: 32px; }
.changelog-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.changelog-item:last-child { border-bottom: none; }
.changelog-ver {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.changelog-ver .v {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-2);
}
.changelog-ver .date { color: var(--text-mute); font-size: 14px; }
.changelog-item ul {
  padding-left: 20px;
  color: var(--text-dim);
}
.changelog-item li { margin-bottom: 6px; }

/* ===== FAQ / 关于页 ===== */
.faq {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  overflow: hidden;
}
.faq-item summary {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-size: 24px;
  color: var(--accent-2);
  transition: transform 0.2s;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p {
  padding: 0 24px 20px;
  color: var(--text-dim);
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}
.contact-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  transition: all 0.3s;
}
.contact-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.contact-card .icon { font-size: 32px; margin-bottom: 16px; }
.contact-card h3 { margin-bottom: 8px; }
.contact-card a { color: var(--accent-2); word-break: break-all; }

/* ===== 页脚 ===== */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
  margin-top: 64px;
}
.footer .container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 32px;
}
.footer-brand p {
  color: var(--text-dim);
  font-size: 14px;
  margin-top: 12px;
  max-width: 280px;
}
.footer-col h4 {
  font-size: 14px;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--text-dim); font-size: 14px; }
.footer-col a:hover { color: var(--accent-2); }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-mute);
  font-size: 13px;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-2);
    padding: 24px;
    border-bottom: 1px solid var(--border);
    gap: 16px;
  }
  .nav-toggle {
    display: flex !important;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
  }
  .nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
  }
  .feature-detail {
    grid-template-columns: 1fr;
  }
  .feature-detail:nth-child(even) .feature-detail-text { order: 0; }
  .footer .container {
    grid-template-columns: 1fr 1fr;
  }
  .hero-stats { gap: 32px; }
  .section { padding: 64px 0; }
}
.nav-toggle { display: none; }