:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: #3b82f6;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
    --mono: 'Space Mono', monospace;
    --sans: 'DM Sans', sans-serif;
    --radius: 12px;
    --nav-h: 72px;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --border-color: #334155;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #60a5fa;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-card: #1e293b;
        --border-color: #334155;
        --accent: #3b82f6;
        --accent-hover: #2563eb;
        --accent-light: #60a5fa;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --text-muted: #64748b;
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--sans), sans-serif;
    font-size: 16px;
    line-height: 1.7;
    overflow-x: hidden;
}

::selection {
    background: var(--accent);
    color: #fff;
}

h1, h2, h3, h4 {
    font-family: var(--mono), sans-serif;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.25s;
}

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

.section-label {
    font-family: var(--mono), sans-serif;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 24px 28px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 80px;
}

.footer-inner {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
}

.footer-nav a {
    font-family: var(--sans), sans-serif;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 20px;
    transition: color 0.2s, background 0.2s;
}

.footer-nav a:hover {
    color: var(--accent);
    background: rgba(59, 130, 246, 0.08);
}

.footer-socials {
    display: flex;
    gap: 10px;
}

.footer-social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 1.1rem;
    text-decoration: none;
    transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.footer-social-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.08);
}

.footer-copy {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.btn-primary {
    font-family: var(--mono), sans-serif;
    font-size: 0.85rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 30px;
    padding: 13px 28px;
    cursor: pointer;
    transition: background 0.25s, box-shadow 0.25s, transform 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
    color: #fff;
    transform: translateY(-1px);
}

.btn-outline {
    font-family: var(--mono), sans-serif;
    font-size: 0.85rem;
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: 30px;
    padding: 11px 26px;
    cursor: pointer;
    transition: border-color 0.25s, color 0.25s, transform 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

.page-content {
    width: min(900px, calc(100% - 40px));
    margin: 0 auto;
    padding: calc(var(--nav-h) + 60px) 24px 60px;
}

.page-header {
    margin-bottom: 48px;
}

.page-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

.page-title span {
    color: var(--accent);
}

@media (max-width: 768px) {
    .page-content {
        padding: calc(var(--nav-h) + 40px) 20px 40px;
    }

    .page-header {
        margin-bottom: 32px;
    }
}