/* =============================================
   SE Sync - Main Stylesheet
   Dark theme with neon gradients
   ============================================= */

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #1e1e35;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b8;
    --text-muted: #666680;
    --accent-1: #00d2ff;
    --accent-2: #7b2ff7;
    --accent-green: #00ff88;
    --border: #2a2a4a;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-1); text-decoration: none; transition: all 0.3s; }
a:hover { color: var(--accent-green); }

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

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 28px; border-radius: 10px; font-weight: 600;
    font-size: 15px; cursor: pointer; transition: all 0.3s;
    border: none; text-decoration: none; gap: 8px;
}
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-lg { padding: 16px 36px; font-size: 17px; }
.btn-block { width: 100%; }
.btn-primary {
    background: var(--gradient); color: #fff;
    box-shadow: 0 4px 20px rgba(0,210,255,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 30px rgba(0,210,255,0.5); color: #fff; }
.btn-outline {
    background: transparent; color: var(--text-primary);
    border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent-1); color: var(--accent-1); }

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation */
.nav {
    display: flex; align-items: center; justify-content: space-between;
    padding: 20px 40px; position: relative; z-index: 10;
}
.nav-brand { font-size: 22px; font-weight: 800; color: #fff; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--text-secondary); font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: #fff; }

/* Hero */
.hero {
    position: relative; min-height: 90vh; display: flex; flex-direction: column;
    overflow: hidden;
}
.hero-content {
    flex: 1; display: flex; flex-direction: column; align-items: center;
    justify-content: center; text-align: center; padding: 40px 24px 80px;
    position: relative; z-index: 2;
}
.hero-badge {
    display: inline-block; padding: 8px 20px; background: rgba(0,210,255,0.1);
    border: 1px solid rgba(0,210,255,0.3); border-radius: 50px;
    font-size: 13px; color: var(--accent-1); margin-bottom: 24px;
    font-weight: 500;
}
.hero h1 { font-size: clamp(36px, 6vw, 64px); font-weight: 800; line-height: 1.15; margin-bottom: 20px; }
.hero-desc {
    font-size: 18px; color: var(--text-secondary); max-width: 600px;
    margin-bottom: 36px; line-height: 1.7;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
.hero-glow {
    position: absolute; top: 20%; left: 50%; transform: translateX(-50%);
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(0,210,255,0.12) 0%, rgba(123,47,247,0.08) 40%, transparent 70%);
    pointer-events: none; z-index: 1;
}

/* Sections */
.section { padding: 100px 0; }
.section-dark { background: var(--bg-secondary); }
.section-title {
    font-size: 36px; font-weight: 800; text-align: center; margin-bottom: 12px;
}
.section-sub { text-align: center; color: var(--text-secondary); font-size: 16px; margin-bottom: 48px; }

/* Features */
.features-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px; margin-top: 48px;
}
.feature-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 32px;
    transition: all 0.3s;
}
.feature-card:hover { transform: translateY(-4px); border-color: var(--accent-1); box-shadow: var(--shadow); }
.feature-icon { font-size: 40px; margin-bottom: 16px; }
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.feature-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.7; }

/* Pricing */
.pricing-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}
.pricing-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 32px;
    position: relative; transition: all 0.3s;
    display: flex; flex-direction: column;
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.pricing-featured {
    border-color: var(--accent-1);
    box-shadow: 0 0 40px rgba(0,210,255,0.15);
}
.pricing-badge {
    position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    padding: 4px 16px; background: var(--gradient); border-radius: 20px;
    font-size: 12px; font-weight: 700; white-space: nowrap;
}
.pricing-header { margin-bottom: 24px; }
.pricing-header h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.pricing-price { font-size: 32px; font-weight: 800; color: var(--accent-green); }
.pricing-features { list-style: none; margin-bottom: 28px; flex: 1; }
.pricing-features li { padding: 8px 0; color: var(--text-secondary); font-size: 14px; }

/* Footer */
.footer { padding: 48px 0 24px; border-top: 1px solid var(--border); }
.footer-content { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.footer-brand { font-size: 20px; font-weight: 700; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--text-secondary); font-size: 14px; }
.footer-copy { text-align: center; color: var(--text-muted); font-size: 13px; }

/* Responsive */
@media (max-width: 768px) {
    .nav { padding: 16px 20px; }
    .nav-links { display: none; }
    .hero-content { padding: 60px 20px; }
    .hero h1 { font-size: 32px; }
    .hero-desc { font-size: 15px; }
    .hero-actions { flex-direction: column; width: 100%; }
    .hero-actions .btn { width: 100%; }
    .section { padding: 60px 0; }
    .section-title { font-size: 28px; }
    .pricing-grid { grid-template-columns: 1fr; }
    .footer-content { flex-direction: column; gap: 16px; }
}