/* ============ Global Reset & Variables ============ */
:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #EEF2FF;
  --accent: #F59E0B;
  --bg: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-dark: #0F172A;
  --text: #1E293B;
  --text-secondary: #64748B;
  --text-light: #94A3B8;
  --border: #E2E8F0;
  --shadow: 0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -4px rgba(0,0,0,.06);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.1),0 8px 10px -6px rgba(0,0,0,.06);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

* { 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','Microsoft YaHei',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; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 50px; font-weight: 600;
  font-size: 15px; cursor: pointer; transition: var(--transition);
  border: none; text-decoration: none;
}
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 4px 14px rgba(79,70,229,.35);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(79,70,229,.45); }
.btn-outline {
  background: transparent; border: 2px solid var(--primary);
  color: var(--primary);
}
.btn-outline:hover { background: var(--primary-light); }
.btn-lg { padding: 16px 36px; font-size: 17px; }
.btn-white { background: #fff; color: var(--primary); }
.btn-white:hover { background: #f1f5f9; }

/* ============ Header ============ */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,.92); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; max-width: 1200px; margin: 0 auto; padding: 0 24px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 22px; font-weight: 800; color: var(--primary);
}
.logo-icon {
  width: 36px; height: 36px; background: linear-gradient(135deg, var(--primary), #818CF8);
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 18px;
}
.nav-links { display: flex; align-items: center; gap: 8px; list-style: none; }
.nav-links a {
  padding: 8px 16px; border-radius: 8px; font-size: 14px;
  font-weight: 500; color: var(--text-secondary); transition: var(--transition);
}
.nav-links a:hover { background: var(--primary-light); color: var(--primary); }
.nav-links .nav-btn { background: var(--primary); color: #fff !important; padding: 8px 20px; border-radius: 50px; }
.nav-links .nav-btn:hover { background: var(--primary-dark); }

/* ============ Hero ============ */
.hero {
  padding: 120px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, #EEF2FF 0%, #FFFFFF 100%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
  width: 600px; height: 600px; background: radial-gradient(circle, rgba(79,70,229,.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--primary-light); color: var(--primary);
  padding: 6px 16px; border-radius: 50px; font-size: 13px; font-weight: 600;
  margin-bottom: 24px; position: relative;
}
.hero-badge .dot { width: 6px; height: 6px; background: #10B981; border-radius: 50%; animation: pulse-dot 2s infinite; }
@keyframes pulse-dot { 0%,100%{opacity:1} 50%{opacity:.4} }
.hero h1 {
  font-size: 52px; font-weight: 800; line-height: 1.15;
  background: linear-gradient(135deg, #1E293B 0%, #4F46E5 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 16px; position: relative;
}
.hero p {
  font-size: 18px; color: var(--text-secondary);
  max-width: 600px; margin: 0 auto 40px; position: relative;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; position: relative; }
.hero-stats {
  display: flex; gap: 48px; justify-content: center; margin-top: 48px;
  position: relative;
}
.stat-item { text-align: center; }
.stat-num { font-size: 32px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 13px; color: var(--text-light); margin-top: 4px; }

/* ============ Section ============ */
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
  display: inline-block; background: var(--primary-light); color: var(--primary);
  padding: 4px 14px; border-radius: 50px; font-size: 13px; font-weight: 600;
  margin-bottom: 12px;
}
.section-title { font-size: 36px; font-weight: 800; margin-bottom: 12px; }
.section-desc { font-size: 16px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* ============ Features Grid ============ */
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px,1fr));
  gap: 24px;
}
.feature-card {
  background: #fff; border-radius: var(--radius-lg); padding: 32px;
  border: 1px solid var(--border); transition: var(--transition);
  position: relative; overflow: hidden;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.feature-icon {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 20px;
}
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ============ Tools Grid ============ */
.tools-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(130px,1fr));
  gap: 12px;
}
.tool-item {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); transition: var(--transition);
  cursor: pointer; font-size: 14px; font-weight: 500;
  background: #fff;
}
.tool-item:hover { border-color: var(--primary); background: var(--primary-light); color: var(--primary); }
.tool-icon { font-size: 20px; flex-shrink: 0; }

/* ============ CTA ============ */
.cta {
  background: linear-gradient(135deg, var(--primary) 0%, #7C3AED 100%);
  padding: 80px 0; text-align: center; color: #fff; border-radius: 24px;
  margin: 0 24px;
}
.cta h2 { font-size: 36px; font-weight: 800; margin-bottom: 12px; }
.cta p { font-size: 16px; opacity: .85; margin-bottom: 32px; }
.cta .btn { background: #fff; color: var(--primary); }
.cta .btn:hover { background: #f1f5f9; }

/* ============ Footer ============ */
.footer {
  background: var(--bg-dark); color: #CBD5E1; padding: 48px 0 32px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
}
.footer-brand h3 { color: #fff; font-size: 20px; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; line-height: 1.8; }
.footer-col h4 { color: #fff; font-size: 14px; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 13px; margin-bottom: 10px; transition: var(--transition); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  text-align: center; padding-top: 32px; margin-top: 32px;
  border-top: 1px solid rgba(255,255,255,.1); font-size: 13px;
}

/* ============ Responsive ============ */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .hero p { font-size: 15px; }
  .nav-links { display: none; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta { margin: 0; border-radius: 0; }
  .section { padding: 48px 0; }
}

/* ============ Animations ============ */
.fade-in { animation: fadeIn .6s ease-out; }
@keyframes fadeIn { from { opacity:0; transform:translateY(20px); } to { opacity:1; transform:translateY(0); } }

/* ============ Ad Container ============ */
.ad-container { text-align: center; padding: 20px 0; }
.ad-container.hidden { display: none; }