/* ======================== */
/*   AiAppWorks.cn Global   */
/* ======================== */

:root {
  --primary: #165DFF;
  --primary-dark: #1249CC;
  --primary-light: #E8F3FF;
  --bg: #F7F8FA;
  --white: #FFFFFF;
  --text: #1D2129;
  --text-secondary: #4E5969;
  --text-muted: #86909C;
  --border: #E5E6EB;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.10);
  --radius: 12px;
  --max-width: 1200px;
  --nav-height: 64px;
  --transition: all 0.25s ease;
}

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

html { scroll-behavior: smooth; }

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

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }

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

/* ============ NAV ============ */

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-size: 20px; font-weight: 700; color: var(--primary);
  letter-spacing: -0.5px;
}

.nav-logo span { color: var(--text); }

.nav-links { display: flex; gap: 32px; align-items: center; }

.nav-links a {
  font-size: 15px; color: var(--text-secondary);
  transition: var(--transition); position: relative;
}

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

.nav-links a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--primary); border-radius: 1px;
}

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 1px; transition: var(--transition); }

/* ============ HERO ============ */

.hero {
  padding: 160px 24px 100px;
  text-align: center;
  background: linear-gradient(180deg, var(--white) 0%, var(--bg) 100%);
}

.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 16px; border-radius: 20px;
  background: var(--primary-light); color: var(--primary);
  font-size: 13px; font-weight: 500; margin-bottom: 24px;
}

.hero-badge::before { content: '\2728'; font-size: 14px; }

.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800; line-height: 1.2;
  letter-spacing: -1px; margin-bottom: 20px;
}

.hero h1 .highlight { color: var(--primary); }

.hero p {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-secondary); max-width: 600px; margin: 0 auto 40px;
}

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

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 8px;
  font-size: 15px; font-weight: 600;
  transition: var(--transition);
}

.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow); }

.btn-outline { border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ============ SECTION ============ */

.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 32px; font-weight: 700; letter-spacing: -0.5px; margin-bottom: 12px; }
.section-header p { color: var(--text-secondary); font-size: 16px; }

/* ============ APP CARDS ============ */

.app-grid {
  display: grid; gap: 24px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.app-card {
  background: var(--white); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
  transition: var(--transition); border: 1px solid transparent;
  display: flex; flex-direction: column;
}

.app-card:hover {
  box-shadow: var(--shadow-hover); transform: translateY(-4px);
  border-color: var(--primary-light);
}

.app-card-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; margin-bottom: 16px; font-weight: 700;
}

.app-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.app-card p { font-size: 14px; color: var(--text-secondary); flex: 1; margin-bottom: 16px; line-height: 1.6; }

.app-card-tag {
  display: inline-block; padding: 4px 10px; border-radius: 6px;
  background: var(--bg); color: var(--text-muted);
  font-size: 12px; font-weight: 500;
}

.app-card-link {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 14px; font-weight: 600; color: var(--primary);
  margin-top: auto; transition: var(--transition);
}

.app-card-link:hover { gap: 8px; }
.app-card-link::after { content: '\2192'; }

/* ============ ADVANTAGES ============ */

.advantages-grid {
  display: grid; gap: 32px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.advantage-item { text-align: center; padding: 24px; }
.advantage-icon {
  width: 56px; height: 56px; border-radius: 16px;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin: 0 auto 16px;
}

.advantage-item h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.advantage-item p { font-size: 14px; color: var(--text-secondary); }

/* ============ FOOTER ============ */

.footer {
  padding: 40px 24px; text-align: center;
  border-top: 1px solid var(--border); background: var(--white);
}

.footer p { font-size: 14px; color: var(--text-muted); }
.footer a { color: var(--primary); }

/* ============ APP DETAIL ============ */

.app-detail { padding: calc(var(--nav-height) + 40px) 0 80px; }

.app-detail-breadcrumb { font-size: 14px; color: var(--text-muted); margin-bottom: 32px; }
.app-detail-breadcrumb a:hover { color: var(--primary); }

.app-detail-header { display: flex; gap: 24px; align-items: flex-start; margin-bottom: 40px; flex-wrap: wrap; }
.app-detail-icon {
  width: 72px; height: 72px; border-radius: 16px; flex-shrink: 0;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 32px; font-weight: 700;
}

.app-detail-info h1 { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.app-detail-info .tag { margin-bottom: 12px; }
.app-detail-info .desc { color: var(--text-secondary); font-size: 15px; line-height: 1.7; }

.app-detail-body { max-width: 800px; }
.app-detail-body h2 { font-size: 20px; font-weight: 600; margin: 32px 0 16px; }
.app-detail-body p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.app-detail-body ul { padding-left: 20px; color: var(--text-secondary); line-height: 2; }

/* ============ ABOUT ============ */

.about-section { padding: calc(var(--nav-height) + 60px) 0 80px; }
.about-content { max-width: 720px; margin: 0 auto; }
.about-content h1 { font-size: 36px; font-weight: 700; margin-bottom: 16px; }
.about-content .lead { font-size: 18px; color: var(--text-secondary); margin-bottom: 40px; line-height: 1.7; }
.about-content h2 { font-size: 22px; font-weight: 600; margin: 40px 0 16px; }
.about-content p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }

/* ============ CATEGORY FILTER ============ */

.category-bar {
  display: flex; gap: 8px; flex-wrap: wrap; justify-content: center;
  margin-bottom: 40px;
}

.category-btn {
  padding: 8px 20px; border-radius: 8px; font-size: 14px; font-weight: 500;
  border: 1.5px solid var(--border); transition: var(--transition);
}

.category-btn:hover { border-color: var(--primary); color: var(--primary); }
.category-btn.active { background: var(--primary); color: var(--white); border-color: var(--primary); }

/* ============ CTA ============ */

.cta {
  text-align: center; padding: 80px 24px;
  background: var(--white); border-radius: var(--radius);
  margin: 0 24px 80px; max-width: var(--max-width); margin-left: auto; margin-right: auto;
}

.cta h2 { font-size: 28px; font-weight: 700; margin-bottom: 12px; }
.cta p { color: var(--text-secondary); margin-bottom: 24px; }

/* ============ RESPONSIVE ============ */

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: var(--nav-height); left: 0; right: 0;
    background: var(--white); padding: 20px 24px; gap: 16px;
    border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
  }
  .nav-toggle { display: flex; }
  .nav-links a.active::after { display: none; }
  .hero { padding: 120px 20px 60px; }
  .section { padding: 60px 0; }
  .app-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr; }
  .app-detail-header { flex-direction: column; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 28px; }
  .btn { padding: 12px 24px; font-size: 14px; }
  .app-card { padding: 20px; }
}