/* SellerGears Landing — Design System */
:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.3);
    --accent: #06b6d4;
    --accent-hover: #0891b2;
    --success: #10b981;
    --warning: #f59e0b;

    --bg-dark: #0a0a1a;
    --bg-card: #111127;
    --bg-card-hover: #181840;
    --bg-section-alt: #0d0d22;
    --border: rgba(99, 102, 241, 0.15);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --radius: 12px;
    --radius-lg: 20px;
    --max-width: 1200px;
    --header-height: 72px;
}

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

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2.5rem, 6vw, 4.2rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.02em; }
h3 { font-size: 1.25rem; }
p { color: var(--text-secondary); }

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-hover); }

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

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 14px 28px; border-radius: var(--radius); font-weight: 600; font-size: 0.95rem;
    border: none; cursor: pointer; transition: all 0.3s ease;
    text-decoration: none; white-space: nowrap;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff; box-shadow: 0 4px 20px var(--primary-glow);
}
.btn-primary:hover {
    transform: translateY(-2px); box-shadow: 0 8px 30px var(--primary-glow);
    color: #fff;
}
.btn-secondary {
    background: transparent; color: var(--text-primary);
    border: 1.5px solid var(--border);
}
.btn-secondary:hover {
    background: rgba(99, 102, 241, 0.08); border-color: var(--primary);
    transform: translateY(-2px); color: var(--text-primary);
}
.btn-sm { padding: 10px 20px; font-size: 0.85rem; }
.btn-lg { padding: 18px 36px; font-size: 1.05rem; }

/* ===== HEADER ===== */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    height: var(--header-height); display: flex; align-items: center;
    transition: all 0.3s ease; backdrop-filter: blur(0);
}
.header.scrolled {
    background: rgba(10, 10, 26, 0.9); backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}
.header .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.3rem; color: var(--text-primary); text-decoration: none; }
.logo-icon {
    width: 36px; height: 36px; border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
}
.nav { display: flex; gap: 32px; align-items: center; }
.nav a { color: var(--text-secondary); font-weight: 500; font-size: 0.9rem; transition: color 0.2s; }
.nav a:hover { color: var(--text-primary); }
.header-actions { display: flex; gap: 12px; align-items: center; }

.mobile-menu-btn { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; }
.mobile-nav {
    display: none; position: fixed; top: var(--header-height); left: 0; right: 0; bottom: 0;
    background: rgba(10, 10, 26, 0.98); backdrop-filter: blur(20px); z-index: 99;
    flex-direction: column; align-items: center; justify-content: center; gap: 24px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a { font-size: 1.2rem; color: var(--text-primary); font-weight: 500; }

/* ===== HERO ===== */
.hero {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    position: relative; overflow: hidden; padding: 120px 0 80px;
}
.hero-bg {
    position: absolute; inset: 0; z-index: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99,102,241,0.15) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(6,182,212,0.08) 0%, transparent 50%);
}
.hero-grid {
    position: absolute; inset: 0; z-index: 0;
    background-image:
        linear-gradient(rgba(99,102,241,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
}
.hero .container { position: relative; z-index: 1; text-align: center; max-width: 860px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 8px 18px; border-radius: 100px; font-size: 0.82rem; font-weight: 500;
    background: rgba(99,102,241,0.1); border: 1px solid rgba(99,102,241,0.2);
    color: var(--primary); margin-bottom: 24px;
}
.hero-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--success); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.hero h1 { margin-bottom: 20px; }
.hero h1 .gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent), #a78bfa);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p { font-size: 1.2rem; max-width: 640px; margin: 0 auto 36px; color: var(--text-secondary); }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
    display: flex; gap: 48px; justify-content: center; margin-top: 64px;
    padding-top: 40px; border-top: 1px solid var(--border);
}
.hero-stat { text-align: center; }
.hero-stat .number { font-size: 2.2rem; font-weight: 800; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-stat .label { font-size: 0.82rem; color: var(--text-muted); margin-top: 4px; }

/* ===== SECTIONS ===== */
section { padding: 100px 0; }
.section-alt { background: var(--bg-section-alt); }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header .section-label {
    display: inline-block; font-size: 0.78rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 2px; color: var(--primary);
    margin-bottom: 12px;
}
.section-header p { max-width: 560px; margin: 12px auto 0; font-size: 1.05rem; }

/* Feature Grid */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 20px; }
.feature-card {
    padding: 32px; border-radius: var(--radius-lg); background: var(--bg-card);
    border: 1px solid var(--border); transition: all 0.3s ease;
    position: relative; overflow: hidden;
}
.feature-card:hover { border-color: rgba(99,102,241,0.3); transform: translateY(-4px); background: var(--bg-card-hover); }
.feature-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    opacity: 0; transition: opacity 0.3s;
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
    width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center;
    justify-content: center; font-size: 1.5rem; margin-bottom: 20px;
    background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(6,182,212,0.1));
}
.feature-card h3 { margin-bottom: 10px; }
.feature-card p { font-size: 0.9rem; color: var(--text-muted); }

/* Integrations Grid */
.integrations-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
.integration-card {
    display: flex; flex-direction: column; align-items: center; gap: 10px;
    padding: 24px 16px; border-radius: var(--radius); background: var(--bg-card);
    border: 1px solid var(--border); transition: all 0.3s ease;
    text-align: center;
}
.integration-card:hover { border-color: var(--primary); transform: translateY(-3px); background: var(--bg-card-hover); }
.integration-card .icon { font-size: 2rem; }
.integration-card .name { font-size: 0.8rem; font-weight: 500; color: var(--text-secondary); }

/* Pricing Cards */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.pricing-card {
    padding: 36px; border-radius: var(--radius-lg); background: var(--bg-card);
    border: 1px solid var(--border); position: relative; transition: all 0.3s ease;
}
.pricing-card:hover { transform: translateY(-4px); border-color: rgba(99,102,241,0.3); }
.pricing-card.popular {
    border-color: var(--primary); background: linear-gradient(180deg, rgba(99,102,241,0.06), var(--bg-card));
}
.pricing-card.popular::before {
    content: 'Most Popular'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    padding: 4px 16px; border-radius: 100px; font-size: 0.72rem; font-weight: 600;
    background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
    text-transform: uppercase; letter-spacing: 0.5px;
}
.pricing-card .plan-name { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.pricing-card .plan-price { font-size: 3rem; font-weight: 800; line-height: 1; margin-bottom: 4px; }
.pricing-card .plan-price span { font-size: 1rem; font-weight: 400; color: var(--text-muted); }
.pricing-card .plan-desc { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 24px; }
.pricing-card .plan-features { list-style: none; margin-bottom: 28px; }
.pricing-card .plan-features li {
    padding: 8px 0; font-size: 0.88rem; color: var(--text-secondary);
    display: flex; align-items: center; gap: 10px;
}
.pricing-card .plan-features li::before { content: '✓'; color: var(--success); font-weight: 700; }
.pricing-card .btn { width: 100%; }

/* Testimonials */
.testimonial-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 20px; }
.testimonial-card {
    padding: 28px; border-radius: var(--radius-lg); background: var(--bg-card);
    border: 1px solid var(--border);
}
.testimonial-card .stars { color: var(--warning); font-size: 0.9rem; margin-bottom: 14px; letter-spacing: 2px; }
.testimonial-card .quote { font-size: 0.95rem; color: var(--text-secondary); font-style: italic; margin-bottom: 18px; line-height: 1.7; }
.testimonial-card .author { display: flex; align-items: center; gap: 12px; }
.testimonial-card .avatar {
    width: 40px; height: 40px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent)); display: flex;
    align-items: center; justify-content: center; font-weight: 700; font-size: 0.9rem;
}
.testimonial-card .author-info .name { font-weight: 600; font-size: 0.88rem; }
.testimonial-card .author-info .role { font-size: 0.78rem; color: var(--text-muted); }

/* CTA Section */
.cta-section {
    position: relative; padding: 100px 0; text-align: center;
    background: linear-gradient(180deg, var(--bg-dark), var(--bg-section-alt));
    overflow: hidden;
}
.cta-section::before {
    content: ''; position: absolute; top: -100px; left: 50%; transform: translateX(-50%);
    width: 600px; height: 600px; border-radius: 50%;
    background: radial-gradient(circle, rgba(99,102,241,0.1) 0%, transparent 70%);
}
.cta-section h2 { margin-bottom: 16px; }
.cta-section p { max-width: 500px; margin: 0 auto 32px; font-size: 1.05rem; }

/* Footer */
.footer {
    padding: 60px 0 30px; border-top: 1px solid var(--border);
    background: var(--bg-section-alt);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { font-size: 0.85rem; color: var(--text-muted); margin-top: 12px; max-width: 280px; }
.footer-col h4 { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--text-secondary); font-size: 0.88rem; transition: color 0.2s; }
.footer-col 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: 0.82rem; color: var(--text-muted);
}
.footer-bottom .social { display: flex; gap: 16px; }
.footer-bottom .social a { color: var(--text-muted); font-size: 1.1rem; transition: color 0.2s; }
.footer-bottom .social a:hover { color: var(--primary); }

/* Animated elements */
.reveal {
    opacity: 0; transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* Responsive */
@media (max-width: 768px) {
    .nav { display: none; }
    .mobile-menu-btn { display: block; }
    .hero-stats { gap: 24px; flex-wrap: wrap; }
    .feature-grid, .pricing-grid, .testimonial-grid { grid-template-columns: 1fr; }
    .integrations-grid { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
    .header-actions .btn-secondary { display: none; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-actions { flex-direction: column; align-items: center; }
    .integrations-grid { grid-template-columns: repeat(2, 1fr); }
}