/* ========== 基础重置与变量 ========== */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --accent: #0ea5e9;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --radius: 16px;
  --radius-sm: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* ========== 头部导航 ========== */
.site-header {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
}
.logo img { height: 36px; width: auto; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text);
}
.site-nav {
  display: flex;
  gap: 8px;
}
.site-nav a {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
}
.site-nav a:hover {
  color: var(--primary);
  background: rgba(37,99,235,0.08);
}

/* ========== Hero 区域 ========== */
.page-hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0ea5e9 100%);
  color: #fff;
  padding: 80px 24px;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.page-hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-content { animation: fadeInUp 0.8s ease-out; }
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.category-badge {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 20px;
  backdrop-filter: blur(4px);
}
.page-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.page-hero p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 520px;
}

/* 下载按钮组 */
.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #fff;
  color: var(--primary);
  padding: 14px 32px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
  transition: var(--transition);
  border: none;
  cursor: pointer;
}
.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
  background: #f0f9ff;
}
.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  padding: 12px 20px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  backdrop-filter: blur(4px);
}
.store-btn:hover {
  background: rgba(255,255,255,0.25);
  transform: translateY(-2px);
}
.store-btn svg { width: 22px; height: 22px; fill: currentColor; }

/* Hero 右侧图片 */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}
.hero-visual img {
  max-width: 380px;
  width: 100%;
  border-radius: 24px;
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.35);
  transition: var(--transition);
}
.hero-visual img:hover {
  transform: scale(1.03) rotate(-1deg);
}

/* ========== 内容区域 ========== */
.content-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px;
}
.download-page-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.info-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.info-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--primary-light);
}
.info-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
}
.info-card h3::before {
  content: "";
  width: 4px;
  height: 24px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 2px;
  display: inline-block;
}
.info-card ol, .info-card ul {
  padding-left: 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}
.info-card li { margin-bottom: 8px; }
.info-card ol li::marker { color: var(--primary); font-weight: 700; }
.info-card ul li::marker { color: var(--accent); }

/* ========== 底部 ========== */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 60px 24px 0;
  margin-top: 40px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-inner p {
  line-height: 1.7;
  font-size: 0.95rem;
  max-width: 480px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-links a {
  color: #94a3b8;
  font-size: 0.95rem;
  transition: var(--transition);
  padding: 4px 0;
}
.footer-links a:hover { color: #fff; }
.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: #64748b;
}

/* ========== 响应式 ========== */
@media (max-width: 900px) {
  .page-hero-inner { grid-template-columns: 1fr; text-align: center; gap: 40px; }
  .page-hero h1 { font-size: 2.2rem; }
  .page-hero p { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  .hero-visual img { max-width: 280px; }
  .download-page-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .site-nav { display: none; }
  .nav-toggle { display: block; }
}
@media (max-width: 480px) {
  .page-hero { padding: 60px 20px; }
  .page-hero h1 { font-size: 1.8rem; }
  .store-btn { padding: 10px 16px; font-size: 0.85rem; }
  .download-btn { padding: 12px 24px; }
}