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

:root {
    --color-primary: #1a56db;
    --color-primary-dark: #1440a8;
    --color-primary-light: #e8effc;
    --color-accent: #06b6d4;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --max-width: 1200px;
    --font-sans:
        "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-primary-dark);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* === HEADER === */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.site-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.site-logo span {
    background: linear-gradient(
        135deg,
        var(--color-primary),
        var(--color-accent)
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === NAV === */
.main-nav {
    display: flex;
    gap: 0.25rem;
}

.main-nav a {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: all 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--color-text);
    font-size: 1.5rem;
}

/* === MAIN === */
.site-main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 60vh;
}

/* === FOOTER === */
.site-footer {
    background: var(--color-text);
    color: #cbd5e1;
    margin-top: 4rem;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem 1.5rem 2rem;
}

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

.footer-brand p {
    font-size: 0.875rem;
    line-height: 1.7;
    color: #94a3b8;
    margin-top: 0.75rem;
}

.footer-title {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #f1f5f9;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #94a3b8;
    font-size: 0.875rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.8rem;
    color: #64748b;
}

/* === UTILS === */
.section-title {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    margin-bottom: 2rem;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-surface);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }

    .main-nav.open {
        display: flex;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .site-main {
        padding: 1.5rem 1rem;
    }
}