/*
 * Base Application Styles
 * 
 * Design philosophy:
 * - Mobile-first responsive design
 * - Relative units (rem, em, %, vw, vh) for scalability
 * - CSS custom properties for easy theming
 * - Minimal specificity for maintainability
 */

:root {
    /* Colors - Core palette */
    --color-bg: #1a1a2e;
    --color-bg-secondary: #16213e;
    --color-text: #eaeaea;
    --color-text-muted: #a0a0a0;
    --color-accent: #e94560;
    --color-accent-secondary: #0f3460;
    --color-success: #4ade80;
    --color-warning: #fbbf24;
    --color-danger: #ef4444;

    /* Typography */
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: clamp(14px, 2vw, 16px);
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.1s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
}

/* ============================================
   Base Reset & Defaults
   ============================================ */

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

html {
    font-size: var(--font-size-base);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family), serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100dvh;
    overflow-x: hidden;
}

/* Prevent text selection during gameplay */
.game-page {
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

/* ============================================
   Button Components
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform var(--transition-fast),
    background-color var(--transition-fast),
    box-shadow var(--transition-fast);
    min-height: 44px;
    min-width: 44px;
}

.btn:active {
    transform: scale(0.97);
}

.btn--primary {
    background: var(--color-accent);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn--primary:hover {
    background: color-mix(in srgb, var(--color-accent) 85%, white);
}

.btn--secondary {
    background: var(--color-accent-secondary);
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
    background: color-mix(in srgb, var(--color-accent-secondary) 85%, white);
}

/* ============================================
   Game Page Layout
   ============================================ */

.game-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100dvh;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
}

.game-header {
    text-align: center;
}

.game-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-accent);
    text-shadow: 0 2px 10px rgba(233, 69, 96, 0.3);
}

.game-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.game-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.game-footer {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
}

.game-error {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(233, 69, 96, 0.15);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    font-size: var(--font-size-sm);
    max-width: 500px;
    width: 100%;
}

.game-error__dismiss {
    background: none;
    border: none;
    color: var(--color-accent);
    font-size: var(--font-size-lg);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.game-error__dismiss:hover {
    opacity: 0.8;
}

/* ============================================
   Game HUD
   ============================================ */

.game-hud {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 500px;
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.game-hud__meta {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.hud-pill {
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.game-hud__stats {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1 1 5rem;
    min-width: 5rem;
}

.stat--wide {
    flex: 1 1 7rem;
    min-width: 7rem;
}

.stat__icon {
    font-size: var(--font-size-lg);
}

.stat__value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.stat__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Progress Bar */
.game-hud__progress {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.progress-bar {
    position: relative;
    height: 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar__fill {
    height: 100%;
    transition: width var(--transition-normal);
}

.progress-bar__fill--danger {
    background: linear-gradient(90deg, var(--color-warning), var(--color-danger));
}

.progress-bar__threshold {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-text);
    opacity: 0.5;
}

.progress-bar__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
}

.debug-info {
    font-size: 0.75rem;
    opacity: 0.6;
    font-family: monospace;
}

/* Controls */
.game-hud__controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Game Result Messages */
.game-result {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: var(--font-size-lg);
    text-align: center;
}

.game-result--win {
    background: rgba(74, 222, 128, 0.2);
    color: var(--color-success);
}

.game-result--lose {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-danger);
}

/* ============================================
   Modal (New Game / Setup)
   ============================================ */

.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(0.25rem);
}

.modal {
    width: min(42rem, 100%);
    max-height: calc(100dvh - (var(--spacing-md) * 2));
    display: flex;
    flex-direction: column;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal--small {
    width: min(24rem, 100%);
}

.modal__header,
.modal__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
}

.modal__footer {
    flex-wrap: wrap;
    justify-content: flex-end;
}

.modal__title {
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.modal__body {
    padding: var(--spacing-md);
    overflow: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.modal__hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.modal__error {
    color: var(--color-accent);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
}

.setup-summary {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
}

.setup-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.setup-divider {
    width: 100%;
    height: 1px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 999px;
}

.setup-field {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.setup-field__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.setup-field__control {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.setup-field__suffix {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.setup-field__help {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    opacity: 0.85;
}

.setup-input {
    width: 100%;
    min-height: 44px;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.06);
    color: var(--color-text);
}

.setup-input:disabled {
    opacity: 0.6;
}

.segmented {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(6.5rem, 1fr));
    gap: var(--spacing-xs);
}

.segmented__btn {
    min-height: 44px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.06);
    color: var(--color-text);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.segmented__btn:active {
    transform: scale(0.98);
}

.segmented__btn--active {
    background: color-mix(in srgb, var(--color-accent-secondary) 80%, white);
    border-color: rgba(255, 255, 255, 0.22);
}

.setup-summary__row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.setup-summary__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.setup-summary__value {
    font-variant-numeric: tabular-nums;
    text-align: right;
    white-space: nowrap;
}

/* Debug drawer (Difficulty Panel) */
.debug-drawer {
    position: fixed;
    top: var(--spacing-md);
    right: 0;
    z-index: 1250;
    display: flex;
    align-items: stretch;
    max-height: calc(100dvh - (var(--spacing-md) * 2));
    transform: translateX(calc(100% - 2.75rem));
    transition: transform var(--transition-slow);
}

.debug-drawer--open {
    transform: translateX(0);
}

.debug-drawer__toggle {
    min-width: 2.75rem;
    border: none;
    background: var(--color-accent-secondary);
    color: var(--color-text);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-xs);
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

.debug-drawer__panel {
    width: min(28rem, 92vw);
    overflow: auto;
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(0.25rem);
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

@media (max-width: 768px) {
    .debug-drawer {
        display: none;
    }
}

/* ============================================
   Main Menu
   ============================================ */

.main-menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100dvh;
    padding: var(--spacing-xl);
    gap: var(--spacing-xl);
}

.main-menu__header {
    text-align: center;
}

.main-menu__nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    width: min(300px, 100%);
}

.btn--large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
    min-height: 56px;
}

/* ============================================
   Responsive Adjustments
   ============================================ */

@media (max-width: 480px) {
    .game-page {
        padding: var(--spacing-sm);
    }

    .game-hud {
        padding: var(--spacing-sm);
    }

    .stat__value {
        font-size: var(--font-size-lg);
    }
}

/* Mobile: prevent accidental page scroll during gameplay */
@media (max-width: 768px) {
    html,
    body {
        height: 100%;
        overflow: hidden;
        overscroll-behavior: none;
    }

    body {
        position: fixed;
        width: 100%;
    }

    .modal__body {
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
    }
}

@media (min-width: 640px) {
    .modal-backdrop {
        align-items: center;
    }

    .setup-grid {
        grid-template-columns: minmax(0, 1fr) 1px minmax(0, 1fr);
        align-items: start;
    }

    .setup-divider {
        width: 1px;
        height: 100%;
        justify-self: stretch;
        align-self: stretch;
    }
}

.setup-field--full {
    grid-column: 1 / -1;
}

@media (min-width: 768px) {
    .game-hud {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        max-width: 700px;
    }

    .game-hud__meta {
        flex: 0 0 100%;
        order: -1;
        justify-content: flex-start;
    }

    .game-hud__stats {
        flex: 0 0 auto;
        flex-wrap: nowrap;
        justify-content: flex-start;
        gap: var(--spacing-md);
    }

    .game-hud__progress {
        flex: 1;
        min-width: 200px;
    }

    .game-hud__controls {
        flex: 0 0 auto;
    }

    .stat,
    .stat--wide {
        flex: 0 0 auto;
    }
}

/* ============================================
   Medal Display
   ============================================ */

.medal-display {
    display: flex;
    justify-content: center;
    margin: var(--spacing-sm) 0;
}

.medal-display__awards {
    display: flex;
    gap: var(--spacing-lg);
}

.medal-award {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    min-width: 5rem;
}

.medal-award__icon {
    font-size: var(--font-size-2xl);
}

.medal-award__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.medal-award__tier {
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.medal-display__none {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
}