/* ==========================================================================
   PupilCheck v2.0 - CSS Custom Properties & Base Styles
   variables.css
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */

:root {
    /* --- Existing Core Palette --- */
    --bg: #1a1a2e;
    --surface: #16213e;
    --surface2: #0f3460;
    --primary: #e94560;
    --primary-light: #ff6b81;
    --text: #eee;
    --text-muted: #aab;
    --success: #2ed573;
    --warning: #ffa502;
    --danger: #ff4757;
    --info: #70a1ff;
    --radius: 12px;

    /* --- New Extended Tokens --- */
    --surface-elevated: #1c2a4a;
    --border-subtle: rgba(255, 255, 255, 0.08);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25), 0 1px 2px rgba(0, 0, 0, 0.18);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35), 0 2px 6px rgba(0, 0, 0, 0.22);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;

    /* Typography */
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;

    /* Focus Ring */
    --focus-ring: 0 0 0 3px rgba(233, 69, 96, 0.45);
}

/* --------------------------------------------------------------------------
   2. Global Reset
   -------------------------------------------------------------------------- */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

/* --------------------------------------------------------------------------
   3. Body Base Styles
   -------------------------------------------------------------------------- */

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    touch-action: manipulation;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   4. Keyframe Animations
   -------------------------------------------------------------------------- */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --------------------------------------------------------------------------
   5. Accessibility - High Contrast
   -------------------------------------------------------------------------- */

@media (prefers-contrast: high) {
    :root {
        --bg: #000000;
        --surface: #111111;
        --surface2: #1a1a1a;
        --surface-elevated: #1a1a1a;
        --text: #ffffff;
        --text-muted: #cccccc;
        --primary: #ff5577;
        --primary-light: #ff8899;
        --success: #44ff88;
        --warning: #ffcc00;
        --danger: #ff4444;
        --info: #88bbff;
        --border-subtle: rgba(255, 255, 255, 0.25);
        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.6);
        --focus-ring: 0 0 0 3px rgba(255, 85, 119, 0.7);
    }

    .btn,
    .eye-label,
    .assessment-box,
    .tip-box,
    .disclaimer {
        border-width: 2px;
    }
}

/* --------------------------------------------------------------------------
   6. Accessibility - Reduced Motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* --------------------------------------------------------------------------
   7. Print Base Overrides
   -------------------------------------------------------------------------- */

@media print {
    :root {
        --bg: #ffffff;
        --surface: #f5f5f5;
        --surface2: #eeeeee;
        --surface-elevated: #f0f0f0;
        --text: #111111;
        --text-muted: #555555;
        --primary: #c0354a;
        --primary-light: #d44d62;
        --border-subtle: rgba(0, 0, 0, 0.12);
    }

    body {
        background: white;
        color: black;
        min-height: auto;
    }

    .header {
        border-bottom-color: #333;
        position: static;
    }

    .btn {
        display: none;
    }

    .screen {
        max-width: 100%;
        display: block !important;
        animation: none;
    }

    .processing-overlay {
        display: none !important;
    }
}