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

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #10b981;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
    --shadow: rgba(0, 0, 0, 0.1);
    --card-bg: #ffffff;
}

[data-theme="dark"] {
    --primary: #60a5fa;
    --primary-dark: #3b82f6;
    --secondary: #34d399;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
    --card-bg: #1e293b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: background 0.3s, border 0.3s;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
}

.theme-icon::before {
    content: '☀️';
    font-size: 20px;
}

[data-theme="dark"] .theme-icon::before {
    content: '🌙';
}

.btn-login {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-login:hover {
    background: var(--bg-secondary);
}

.btn-primary, .btn-large, .btn-cta {
    padding: 10px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary:hover, .btn-large:hover, .btn-cta:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-outline-large {
    padding: 14px 32px;
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    border-radius: 8px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-outline-large:hover {
    background: var(--primary);
    color: white;
}

.hero {
    padding: 100px 0;
    background: linear-gradient(rgba(59, 130, 246, 0.9), rgba(37, 99, 235, 0.9)), url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?w=1600&h=800&fit=crop') center/cover;
    text-align: center;
    position: relative;
}

[data-theme="dark"] .hero {
    background: linear-gradient(rgba(15, 23, 42, 0.85), rgba(15, 23, 42, 0.85)), url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?w=1600&h=800&fit=crop') center/cover;
}

.hero-content h1,
.hero-content > p {
    color: white;
    text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.hero-stats .stat h3,
.hero-stats .stat p {
    color: white;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.hero-content h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.1;
}

.hero-content p {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 48px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    margin-bottom: 48px;
}

.stat h3 {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.stat p {
    color: var(--text-secondary);
    font-size: 14px;
}

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

.features {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    padding: 32px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    stroke: white;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.pricing {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.pricing-toggle {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-bottom: 48px;
}

.toggle-label {
    font-weight: 600;
    color: var(--text-primary);
}

.save-badge {
    background: var(--secondary);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    margin-left: 8px;
}

.switch {
    position: relative;
    width: 56px;
    height: 28px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--border);
    transition: 0.3s;
    border-radius: 28px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background: white;
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .slider {
    background: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(28px);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.plan-card {
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 40px;
    transition: all 0.3s;
}

.plan-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow);
}

.plan-card.featured {
    border-color: var(--primary);
    position: relative;
}

.plan-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.plan-name {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
}

.plan-price {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 8px;
}

.plan-price span {
    font-size: 18px;
    color: var(--text-secondary);
    font-weight: 400;
}

.plan-description {
    color: var(--text-secondary);
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.plan-features {
    list-style: none;
    margin-bottom: 32px;
}

.plan-features li {
    padding: 12px 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.plan-features svg {
    width: 20px;
    height: 20px;
    stroke: var(--secondary);
    flex-shrink: 0;
}

.plan-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
}

.plan-btn:hover {
    background: var(--primary-dark);
}

.about {
    padding: 100px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-content h2 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 24px;
}

.about-content > p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.benefits-list {
    list-style: none;
}

.benefits-list li {
    display: flex;
    gap: 20px;
    margin-bottom: 32px;
}

.benefit-icon {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.benefit-icon svg {
    stroke: white;
}

.benefits-list h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.benefits-list p {
    color: var(--text-secondary);
}

.about-visual {
    display: flex;
    justify-content: center;
}

.server-stack {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.server-item {
    width: 400px;
    height: 80px;
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.server-item::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    animation: scan 3s infinite;
}

@keyframes scan {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.cta {
    padding: 100px 0;
    background: var(--primary);
    text-align: center;
}

.cta-content h2 {
    font-size: 48px;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
}

.cta-content > p {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
}

.btn-cta {
    background: white;
    color: var(--primary);
    padding: 16px 40px;
    font-size: 18px;
}

.btn-cta:hover {
    background: var(--bg-secondary);
}

.cta-note {
    margin-top: 16px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

.footer {
    background: var(--bg-secondary);
    padding: 80px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
}

.footer-col p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

.footer-bottom a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .nav-menu { display: none; }
    .hero-content h1 { font-size: 36px; }
    .hero-stats { flex-direction: column; gap: 32px; }
    .about-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .server-item { width: 100%; }
}