/* 小云同学 — 微信风格 APP 下载页 */

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

:root {
  --primary: #07C160;
  --primary-hover: #06AD56;
  --primary-light: rgba(7, 193, 96, 0.08);
  --bg: #FFFFFF;
  --bg-secondary: #F8F8F8;
  --border: #E8E8E8;
  --text: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 4px 16px rgba(0,0,0,0.06);
  --transition: all 0.2s ease;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.9);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  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);
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 4px 0;
  transition: var(--transition);
}

.nav a:hover { color: var(--primary); }

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ===== Buttons ===== */
.btn-ghost {
  padding: 8px 16px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-ghost:hover { color: var(--text); }

.btn-primary {
  display: inline-block;
  padding: 10px 24px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }

.btn-outline {
  display: inline-block;
  padding: 10px 24px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: var(--radius-lg); }
.btn-block { display: block; text-align: center; width: 100%; }

/* ===== Hero ===== */
.hero {
  padding: 100px 0 80px;
  text-align: center;
}

.hero h1 {
  font-size: 48px;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.6;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  max-width: 500px;
  margin: 0 auto;
}

.stat { text-align: center; }
.stat-value { display: block; font-size: 28px; font-weight: 800; color: var(--text); }
.stat-label { font-size: 13px; color: var(--text-muted); }

/* ===== Section Header ===== */
.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 48px;
}

.section-header h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: 16px;
  color: var(--text-secondary);
}

/* ===== Features ===== */
.features {
  padding: 80px 0;
  background: var(--bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 28px 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  text-align: center;
}

.feature-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.feature-icon {
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== Tools ===== */
.tools {
  padding: 80px 0;
}

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

.tool-card {
  padding: 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  text-align: center;
}

.tool-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.tool-card h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}

.tool-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ===== Download ===== */
.download {
  padding: 80px 0;
  background: var(--bg-secondary);
}

.download-card {
  max-width: 600px;
  margin: 0 auto;
  padding: 48px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow);
}

.download-content h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 16px;
}

.download-content p {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.download-info {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.info-value {
  font-size: 16px;
  font-weight: 700;
}

.download-note {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 16px;
}

/* ===== CTA ===== */
.cta {
  padding: 80px 0;
}

.cta-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-content p {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* ===== Footer ===== */
.footer {
  padding: 64px 0 32px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 16px;
  line-height: 1.6;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  padding: 6px 0;
  transition: var(--transition);
}

.footer-links a:hover { color: var(--primary); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
}

.footer-social {
  display: flex;
  gap: 20px;
}

.footer-social a {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-social a:hover { color: var(--text); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .nav { display: none; }
  .section-header h2 { font-size: 26px; }
  .features-grid { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: 1fr; }
  .download-info { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 16px; }
}