/* ═══════════════════════════════════════════════════
   UDEC Light Glassmorphism — Base & Layout
   ═══════════════════════════════════════════════════ */

:root {
    --bg-body: #e8edf4;
    --bg-card: rgba(255, 255, 255, 0.55);
    --bg-card-solid: #ffffff;
    --bg-surface: rgba(255, 255, 255, 0.4);
    --bg-input: rgba(255, 255, 255, 0.75);
    --bg-input-focus: rgba(255, 255, 255, 0.9);
    --border-subtle: rgba(255, 255, 255, 0.6);
    --border-medium: rgba(0, 0, 0, 0.1);
    --border-focus: #3b6ddb;
    --accent-primary: #3b6ddb;
    --accent-dark: #2c54b0;
    --accent-light: rgba(59, 109, 219, 0.1);
    --accent-gradient: linear-gradient(135deg, #3b6ddb, #2c54b0);
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-white: #ffffff;
    --text-muted: #94a3b8;
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 8px 32px rgba(59, 109, 219, 0.1);
    --shadow-dropdown: 0 8px 32px rgba(0, 0, 0, 0.12);
    --radius-md: 0.625rem;
    --radius-lg: 0.875rem;
    --blur-card: blur(16px);
    --blur-surface: blur(10px);
    --font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* ── Base ── */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    background: linear-gradient(135deg, #e8edf4 0%, #dce4f0 50%, #d0daea 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-family);
    min-height: 100vh;
    margin: 0;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: rgba(59, 109, 219, 0.2);
    color: var(--text-primary);
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15);
    border-radius: 3px;
}

    ::-webkit-scrollbar-thumb:hover {
        background: var(--accent-primary);
    }

/* ── Layout ── */
.site-header {
    background: var(--accent-gradient);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: 0 2px 16px rgba(44, 84, 176, 0.3);
}

    .site-header .nav-brand {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        color: var(--text-white);
        font-weight: 700;
        font-size: 1.1rem;
    }

    .site-header .nav-link {
        color: rgba(255, 255, 255, 0.85);
        text-decoration: none;
        font-size: 0.875rem;
        font-weight: 500;
        transition: color 0.2s;
    }

        .site-header .nav-link:hover {
            color: #ffffff;
        }

.site-footer {
    background: rgba(55, 65, 81, 0.9);
    backdrop-filter: var(--blur-surface);
    -webkit-backdrop-filter: var(--blur-surface);
    color: #9ca3af;
    text-align: center;
    padding: 1rem;
    font-size: 0.8rem;
    margin-top: 3rem;
}