/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --primary-light: #818cf8;
    --accent: #06b6d4;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-light: #f8fafc;
    --text: #e2e8f0;
    --text-dark: #1e293b;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #10b981;
    --error: #ef4444;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0,0,0,0.12);
}

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}

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

a { color: var(--primary-light); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all .2s;
    text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.btn-outline { border-color: var(--primary-light); color: var(--primary-light); background: transparent; }
.btn-outline:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-lg { padding: 16px 36px; font-size: 17px; }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-block { display: block; width: 100%; }

/* === Navbar === */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
}
.nav-container { display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 22px; font-weight: 700; color: #fff; }
.logo:hover { color: #fff; }
.nav-links { display: flex; gap: 32px; }
.nav-links a { color: var(--text-muted); font-weight: 500; }
.nav-links a:hover { color: #fff; }

/* === Hero === */
.hero {
    position: relative;
    padding: 160px 0 100px;
    text-align: center;
    overflow: hidden;
}
.hero-bg {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(79,70,229,0.25) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 80%, rgba(6,182,212,0.15) 0%, transparent 50%);
}
.hero-content { position: relative; z-index: 1; }
.hero h1 {
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, var(--primary-light) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}
.hero-subtitle {
    font-size: clamp(18px, 3vw, 24px);
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto; margin-right: auto;
}
.hero-stats {
    display: flex; justify-content: center; gap: 48px;
    margin-top: 60px;
}
.stat { text-align: center; }
.stat-num { display: block; font-size: 28px; font-weight: 700; color: #fff; }
.stat-label { font-size: 13px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

/* === Section Common === */
.section-title {
    font-size: 36px; font-weight: 700; text-align: center;
    margin-bottom: 48px; color: #fff;
}

/* === About === */
.about { padding: 80px 0; }
.about-text {
    max-width: 700px; margin: 0 auto;
    font-size: 18px; color: var(--text-muted);
    text-align: center; line-height: 1.8;
}

/* === Features === */
.features { padding: 80px 0; background: var(--bg-card); }
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}
.feature-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    transition: transform .2s, border-color .2s;
}
.feature-card:hover { transform: translateY(-4px); border-color: var(--primary-light); }
.feature-icon { font-size: 40px; margin-bottom: 16px; }
.feature-card h3 { font-size: 20px; margin-bottom: 8px; color: #fff; }
.feature-card p { color: var(--text-muted); font-size: 15px; }

/* === Pricing === */
.pricing { padding: 80px 0; }
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    align-items: start;
}
.price-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
    text-align: center;
    transition: transform .2s;
}
.price-card:hover { transform: translateY(-4px); }
.price-card-popular {
    border-color: var(--primary);
    box-shadow: 0 0 40px rgba(79,70,229,0.2);
    position: relative;
}
.popular-badge {
    position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    background: var(--primary); color: #fff;
    padding: 4px 16px; border-radius: 20px;
    font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 1px;
}
.price-header h3 { font-size: 22px; color: #fff; margin-bottom: 8px; }
.price-amount { font-size: 42px; font-weight: 800; color: #fff; }
.price-amount span { font-size: 16px; font-weight: 400; color: var(--text-muted); }
.price-features { list-style: none; margin: 24px 0; text-align: left; }
.price-features li { padding: 8px 0; color: var(--text-muted); border-bottom: 1px solid var(--border); }
.price-features li:last-child { border-bottom: none; }

/* === CTA === */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-dark), var(--bg));
}
.cta-content { text-align: center; }
.cta-content h2 { font-size: 36px; color: #fff; margin-bottom: 16px; }
.cta-content p { font-size: 18px; color: var(--text-muted); margin-bottom: 32px; }

/* === Footer === */
.footer {
    padding: 48px 0 24px;
    border-top: 1px solid var(--border);
    background: var(--bg-card);
}
.footer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}
.footer h3 { color: #fff; margin-bottom: 8px; }
.footer h4 { color: #fff; margin-bottom: 12px; font-size: 16px; }
.footer p { color: var(--text-muted); font-size: 14px; margin-bottom: 4px; }
.footer-bottom { text-align: center; padding-top: 24px; border-top: 1px solid var(--border); }
.footer-bottom p { font-size: 13px; color: var(--text-muted); }

/* === Admin Login === */
.admin-login-wrap {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    background: var(--bg);
}
.admin-login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 48px;
    width: 100%; max-width: 400px;
    text-align: center;
}
.admin-login-card h2 { color: #fff; margin-bottom: 4px; }
.admin-login-sub { color: var(--text-muted); margin-bottom: 32px; }
.admin-back-link { display: inline-block; margin-top: 16px; color: var(--text-muted); font-size: 14px; }

/* === Admin Layout === */
.admin-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 100vh;
}
.admin-sidebar {
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    padding: 24px 0;
    display: flex; flex-direction: column;
    position: sticky; top: 0; height: 100vh;
}
.admin-logo {
    padding: 0 24px 24px;
    font-size: 20px; font-weight: 700; color: #fff;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
}
.admin-nav { flex: 1; padding: 0 12px; }
.admin-nav-link {
    display: block;
    padding: 10px 16px;
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 14px; font-weight: 500;
    margin-bottom: 4px;
    transition: all .15s;
}
.admin-nav-link:hover, .admin-nav-link.active {
    background: var(--primary);
    color: #fff;
}
.admin-sidebar-footer {
    padding: 16px 16px 0;
    border-top: 1px solid var(--border);
    display: flex; flex-direction: column; gap: 8px;
}
.admin-main { padding: 32px 40px; overflow-y: auto; }
.admin-header { margin-bottom: 32px; }
.admin-header h1 { font-size: 28px; color: #fff; }
.admin-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 24px;
}
.admin-section-title {
    font-size: 20px; color: #fff;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.admin-fields { display: grid; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; }
.form-group input, .form-group textarea {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    color: #fff;
    font-size: 15px;
    font-family: inherit;
    transition: border-color .2s;
}
.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}
.form-group textarea { resize: vertical; min-height: 80px; }
.admin-save-bar {
    position: sticky; bottom: 0;
    background: var(--bg);
    padding: 16px 0;
    border-top: 1px solid var(--border);
    margin-top: 24px;
    text-align: right;
}

/* === Alerts === */
.alert {
    padding: 12px 20px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
    font-weight: 500;
}
.alert-success { background: rgba(16,185,129,0.15); color: var(--success); border: 1px solid rgba(16,185,129,0.3); }
.alert-error { background: rgba(239,68,68,0.15); color: var(--error); border: 1px solid rgba(239,68,68,0.3); }

/* === Responsive === */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero { padding: 120px 0 60px; }
    .hero-stats { flex-wrap: wrap; gap: 24px; }
    .features-grid, .pricing-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .admin-layout { grid-template-columns: 1fr; }
    .admin-sidebar {
        position: relative; height: auto;
        flex-direction: row; flex-wrap: wrap;
        padding: 12px;
    }
    .admin-logo { padding: 0 12px 12px; width: 100%; border-bottom: 1px solid var(--border); }
    .admin-nav { display: flex; gap: 4px; flex-wrap: wrap; padding: 0; }
    .admin-sidebar-footer { flex-direction: row; border-top: none; padding: 8px 0 0; }
    .admin-main { padding: 16px; }
}