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

:root {
    --color-bg: #0a0a0f;
    --color-surface: #12121a;
    --color-surface-hover: #1a1a25;
    --color-border: #2a2a3a;
    --color-text: #e4e4ef;
    --color-text-muted: #9898a8;
    --color-primary: #6366f1;
    --color-primary-hover: #818cf8;
    --color-accent: #a78bfa;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    --max-width: 1100px;
    --radius: 12px;
    --radius-sm: 8px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: var(--color-primary-hover);
    text-decoration: none;
    transition: color 0.15s;
}

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

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* === Header === */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.site-header nav {
    display: flex;
    gap: 28px;
}

.site-header nav a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.15s;
}

.site-header nav a:hover {
    color: var(--color-text);
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    border: none;
    text-decoration: none;
}

.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    color: #fff;
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.05rem;
}

/* === Hero === */
.hero {
    padding: 100px 0 80px;
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 100px;
    background: rgba(99, 102, 241, 0.15);
    color: var(--color-primary-hover);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(99, 102, 241, 0.25);
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    max-width: 720px;
    margin: 0 auto 20px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* === Sections === */
section {
    padding: 80px 0;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-intro {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin-bottom: 48px;
}

/* === Problem Section === */
.problem {
    border-top: 1px solid var(--color-border);
}

.problem-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.problem-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
}

.problem-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.problem-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* === Features === */
.features {
    border-top: 1px solid var(--color-border);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
    transition: border-color 0.15s, background 0.15s;
}

.feature-card:hover {
    border-color: var(--color-primary);
    background: var(--color-surface-hover);
}

.feature-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.12);
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    color: var(--color-primary-hover);
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* === Use Cases === */
.use-cases {
    border-top: 1px solid var(--color-border);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.use-case-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
}

.use-case-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.use-case-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* === Installation === */
.installation {
    border-top: 1px solid var(--color-border);
}

.code-block {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-bottom: 20px;
    overflow: hidden;
}

.code-header {
    padding: 12px 20px;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.code-block pre {
    padding: 20px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--color-text);
}

.comment {
    color: var(--color-text-muted);
}

.install-links {
    display: flex;
    gap: 12px;
    margin-top: 32px;
    flex-wrap: wrap;
}

/* === CTA Section === */
.cta-section {
    border-top: 1px solid var(--color-border);
    text-align: center;
    padding: 100px 0;
}

.cta-section p {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    max-width: 520px;
    margin: 0 auto 32px;
}

/* === Footer === */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 60px 0 40px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 300px;
}

.logo-text {
    font-size: 1.1rem;
    font-weight: 700;
    display: block;
    margin-bottom: 8px;
}

.footer-brand p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

.license {
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-col a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

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

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 24px;
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* === Responsive === */
@media (max-width: 768px) {
    .hero {
        padding: 60px 0 50px;
    }

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

    .subtitle {
        font-size: 1rem;
    }

    section {
        padding: 50px 0;
    }

    h2 {
        font-size: 1.6rem;
    }

    .problem-grid,
    .features-grid,
    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 32px;
    }

    .footer-links {
        gap: 32px;
    }

    .site-header nav {
        gap: 16px;
    }

    .site-header nav a {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero h1 {
        font-size: 1.7rem;
    }

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

    .install-links {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}