/* 91PO官网 - 全局样式 */
:root {
  --bg-primary: #0a0a12;
  --bg-secondary: #12121f;
  --bg-card: #1a1a2e;
  --accent: #ff6b35;
  --accent-hover: #ff8555;
  --purple: #7b61ff;
  --purple-light: #9d8aff;
  --text-primary: #ffffff;
  --text-secondary: #b0b0c0;
  --text-muted: #6b6b80;
  --border: #2a2a40;
  --gradient: linear-gradient(135deg, #7b61ff 0%, #ff6b35 100%);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --max-width: 1200px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
}

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

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

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* 头部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 18, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-link img { width: 48px; height: 48px; border-radius: 10px; }

.logo-text { font-size: 1.35rem; font-weight: 700; color: var(--text-primary); }
.logo-text span { color: var(--accent); }

.main-nav { display: flex; gap: 8px; align-items: center; }

.main-nav a {
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active { color: var(--text-primary); background: var(--bg-card); }

.nav-cta {
  background: var(--gradient) !important;
  color: #fff !important;
  font-weight: 600;
  padding: 10px 20px !important;
}

.nav-cta:hover { opacity: 0.9; color: #fff !important; }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* Hero 区域 */
.hero {
  padding: 60px 0 80px;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(123, 97, 255, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: 2.4rem;
  line-height: 1.3;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, #ccc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.badge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, opacity 0.2s;
}

.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--gradient);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.hero-image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

/* 轮播横幅 */
.banner-section { padding: 40px 0; }

.banner-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.banner-item {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform 0.3s;
}

.banner-item:hover { transform: scale(1.03); }

/* 功能区块 */
.section { padding: 64px 0; }

.section-alt { background: var(--bg-secondary); }

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.section-header p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.3s, transform 0.3s;
}

.feature-card:hover {
  border-color: var(--purple);
  transform: translateY(-4px);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.feature-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.feature-card p { color: var(--text-secondary); font-size: 0.95rem; }

/* 展示区 */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  overflow: hidden;
}

.showcase-item:nth-child(even) { direction: rtl; }
.showcase-item:nth-child(even) > * { direction: ltr; }

.showcase-img {
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.showcase-content h3 { font-size: 1.25rem; margin-bottom: 12px; color: var(--accent); }
.showcase-content p { color: var(--text-secondary); margin-bottom: 16px; font-size: 0.95rem; }

.showcase-tags { display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
  background: rgba(123, 97, 255, 0.15);
  color: var(--purple-light);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
}

/* 分类网格 */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.category-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  aspect-ratio: 16/10;
}

.category-card img { width: 100%; height: 100%; object-fit: cover; }

.category-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent 40%, rgba(0,0,0,0.85));
  display: flex;
  align-items: flex-end;
  padding: 16px;
}

.category-overlay h4 { font-size: 1rem; }

/* 下载指南 */
.download-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  counter-reset: step;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  position: relative;
}

.step-card::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--gradient);
  border-radius: 50%;
  font-weight: 700;
  margin: 0 auto 16px;
}

.step-card h4 { margin-bottom: 8px; }
.step-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::after { content: "+"; font-size: 1.2rem; color: var(--accent); }
.faq-item.open .faq-question::after { content: "−"; }

.faq-answer {
  display: none;
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.faq-item.open .faq-answer { display: block; }

/* 长文内容区 */
.article-content {
  max-width: 900px;
  margin: 0 auto;
}

.article-content h2 {
  font-size: 1.5rem;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}

.article-content h3 {
  font-size: 1.2rem;
  margin: 28px 0 12px;
  color: var(--accent);
}

.article-content p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  text-align: justify;
}

.article-content ul, .article-content ol {
  color: var(--text-secondary);
  margin: 0 0 16px 24px;
}

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

/* 内页通用 */
.page-hero {
  padding: 48px 0;
  background: var(--bg-secondary);
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 { font-size: 2rem; margin-bottom: 8px; }
.page-hero p { color: var(--text-secondary); }

.page-content {
  padding: 48px 0 80px;
  max-width: 900px;
  margin: 0 auto;
}

.page-content h2 {
  font-size: 1.35rem;
  margin: 32px 0 12px;
  color: var(--text-primary);
}

.page-content h3 {
  font-size: 1.1rem;
  margin: 24px 0 10px;
  color: var(--accent);
}

.page-content p, .page-content li {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.page-content ul, .page-content ol { margin-left: 24px; margin-bottom: 16px; }

/* 错误页 */
.error-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.error-code {
  font-size: 6rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
}

.error-page h1 { font-size: 1.5rem; margin-bottom: 12px; }
.error-page p { color: var(--text-secondary); margin-bottom: 32px; }

/* 页脚 */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand img { width: 56px; border-radius: 10px; margin-bottom: 12px; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; }

.footer-col h4 { font-size: 1rem; margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--text-secondary); font-size: 0.9rem; }
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p { color: var(--text-muted); font-size: 0.85rem; }

.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); font-size: 0.85rem; }

/* 面包屑 */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-secondary); }
.breadcrumb span { margin: 0 8px; }

/* 响应式 - 平板 */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero h1 { font-size: 2rem; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .banner-grid { grid-template-columns: repeat(2, 1fr); }
  .download-steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 响应式 - 手机 */
@media (max-width: 768px) {
  body.sub-page .page-hero .container,
  body.sub-page .container.page-content {
    padding-left: 24px;
    padding-right: 24px;
  }

  body.sub-page .container.page-content {
    padding-top: 32px;
    padding-bottom: 60px;
  }

  body.sub-page .page-hero {
    padding-top: 32px;
    padding-bottom: 32px;
  }

  body.sub-page .error-page {
    padding-left: 24px;
    padding-right: 24px;
  }

  body.sub-page .site-footer .container {
    padding-left: 24px;
    padding-right: 24px;
  }

  .menu-toggle { display: block; }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
  }

  .main-nav.open { display: flex; }

  .main-nav a { width: 100%; text-align: center; padding: 12px; }

  .hero { padding: 40px 0 60px; }
  .hero h1 { font-size: 1.6rem; }
  .hero-desc { font-size: 1rem; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }

  .section { padding: 40px 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .showcase-item { grid-template-columns: 1fr; }
  .showcase-item:nth-child(even) { direction: ltr; }
  .category-grid { grid-template-columns: 1fr 1fr; }
  .banner-grid { grid-template-columns: 1fr 1fr; }
  .download-steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .error-code { font-size: 4rem; }
}