:root {
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-tertiary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent: #2196f3;
    --accent-dim: rgba(33, 150, 243, 0.12);
    --border: #2d2d2d;

    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
}

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

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;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* Hero Section - Clean Material */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    overflow: hidden;
}

/* NO GRID OVERLAY - Clean Material Design */
.grid-overlay {
    display: none;
}

.hero-content {
    text-align: center;
    z-index: 1;
    position: relative;
}

.logo {
    font-size: 1.25rem;
    letter-spacing: 2px;
    margin-bottom: 30px;
    color: var(--accent);
    font-weight: 600;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 400;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.tagline {
    font-size: 1.375rem;
    color: var(--text-secondary);
    margin-bottom: 50px;
    font-weight: 300;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 40px;
}

.hero-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center;
    margin-top: 30px;
}

.hero-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.hero-link:not(.disabled):hover {
    color: var(--accent);
}

.hero-link.disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.separator {
    color: var(--border);
    font-size: 0.875rem;
}

.badge-small {
    font-size: 0.75rem;
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.05);
}

/* Buttons - Material Design */
.btn {
    display: inline-block;
    padding: 12px 32px;
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    border-radius: 4px;
    font-family: inherit;
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: #1976d2;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.23);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent);
    color: var(--accent);
}

.status-badge {
    display: inline-block;
    padding: 8px 20px;
    border: none;
    color: var(--accent);
    font-size: 0.875rem;
    background: var(--accent-dim);
    margin-top: 20px;
    border-radius: 16px;
}

/* Section Styles */
section {
    padding: 120px 0;
    border-top: 1px solid var(--border);
}

.section-header {
    margin-bottom: 60px;
}

.section-label {
    display: block;
    color: var(--accent);
    font-size: 0.9375rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.section-header h2 {
    font-size: 3rem;
    font-weight: 400;
    letter-spacing: -0.5px;
}

/* About Section */
.about {
    background: var(--bg-secondary);
}

.about-content {
    max-width: 800px;
}

.about-content p {
    font-size: 1.375rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
    font-weight: 300;
}

/* Use Cases Section - Material Cards */
.use-cases {
    background: var(--bg-primary);
}

.use-case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.use-case-item {
    background: var(--bg-secondary);
    padding: 32px 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.use-case-item:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.use-case-number {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 1.75rem;
    color: rgba(255, 255, 255, 0.1);
    font-weight: 600;
    line-height: 1;
}

.use-case-item h4 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    font-weight: 500;
    color: var(--text-primary);
}

.use-case-item p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9375rem;
}

/* Models Section - Material Elevation */
.models {
    background: var(--bg-secondary);
}

.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
}

.model-card {
    background: var(--bg-tertiary);
    padding: 40px 32px;
    border: 1px solid var(--border);
    border-radius: 8px;
    position: relative;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.model-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-number {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 2.5rem;
    color: rgba(255, 255, 255, 0.08);
    font-weight: 600;
}

.model-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    font-weight: 500;
}

.model-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.9375rem;
}

/* Features Section - Clean Grid */
.features {
    background: var(--bg-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.feature-item {
    background: var(--bg-tertiary);
    padding: 32px 24px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.feature-item:hover {
    background: var(--bg-secondary);
}

.feature-number {
    display: block;
    color: var(--accent);
    font-size: 2rem;
    margin-bottom: 16px;
    font-weight: 600;
    opacity: 0.2;
    line-height: 1;
}

.feature-item h4 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* CTA Section - Material */
.cta {
    background: var(--bg-secondary);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 400;
}

.cta-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* Footer - Clean */
footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: 50px 0;
}

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

.logo-small {
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--accent);
    margin-bottom: 10px;
    font-size: 1.125rem;
}

.footer-left p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.footer-right {
    display: flex;
    gap: 30px;
}

.footer-right a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.9375rem;
}

.footer-right a:hover {
    color: var(--accent);
}

.footer-status {
    color: var(--text-secondary);
    font-size: 0.875rem;
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.03);
}

.footer-note {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-top: 5px;
    opacity: 0.7;
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1.125rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-links {
        flex-direction: column;
        gap: 10px;
    }

    .separator {
        display: none;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .use-case-grid {
        grid-template-columns: 1fr;
    }

    .model-grid {
        grid-template-columns: 1fr;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }

    .footer-right {
        flex-direction: column;
        gap: 15px;
    }
}