/* ============================================
   GameBox — Shared Design System
   All games import this for consistent styling.
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --gb-bg: #0f1117;
    --gb-surface: #1a1d2e;
    --gb-border: #2d3148;
    --gb-text: #e8eaed;
    --gb-text-muted: #a0aec0;
    --gb-accent: #38b2ac;
    --gb-accent-hover: #2c9a94;
    --gb-success: #48bb78;
    --gb-danger: #f56565;
    --gb-warning: #ecc94b;
    --gb-font: 'Inter', sans-serif;
    --gb-radius: 12px;
    --gb-radius-sm: 8px;
    --gb-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --gb-transition: 0.2s ease;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--gb-font);
    color: var(--gb-text);
    background: var(--gb-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

a {
    text-decoration: none;
    color: inherit;
}

/* --- Back Link --- */
.back-link {
    position: fixed;
    top: 1rem;
    left: 1rem;
    color: var(--gb-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--gb-border);
    border-radius: var(--gb-radius-sm);
    background: var(--gb-surface);
    transition: all var(--gb-transition);
    z-index: 100;
}

.back-link:hover {
    color: var(--gb-accent);
    border-color: var(--gb-accent);
}

/* --- Game Container Shell --- */
.game-shell {
    background: var(--gb-surface);
    border: 1px solid var(--gb-border);
    border-radius: var(--gb-radius);
    padding: 2rem;
    box-shadow: var(--gb-shadow);
    max-width: 550px;
    width: 90%;
    text-align: center;
}

.game-shell h1 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    color: var(--gb-text);
}

/* --- Shared Button Styles --- */
.gb-btn {
    display: inline-block;
    padding: 0.5rem 1.4rem;
    border: 2px solid var(--gb-accent);
    border-radius: 20px;
    background: transparent;
    color: var(--gb-accent);
    font-family: var(--gb-font);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--gb-transition);
}

.gb-btn:hover {
    background: var(--gb-accent);
    color: var(--gb-bg);
}

.gb-btn.active,
.gb-btn.selected {
    background: var(--gb-accent);
    color: var(--gb-bg);
    border-color: var(--gb-accent);
}

.gb-btn-solid {
    display: inline-block;
    padding: 0.55rem 1.5rem;
    border: none;
    border-radius: var(--gb-radius-sm);
    background: var(--gb-accent);
    color: var(--gb-bg);
    font-family: var(--gb-font);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--gb-transition);
}

.gb-btn-solid:hover {
    background: var(--gb-accent-hover);
}

/* --- Scoreboard --- */
.gb-scoreboard {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1.2rem;
    font-size: 0.9rem;
    color: var(--gb-text-muted);
}

.gb-scoreboard span {
    font-weight: 700;
    color: var(--gb-accent);
}

/* --- Difficulty / Mode Selector --- */
.gb-selector {
    display: flex;
    justify-content: center;
    gap: 0.4rem;
    margin-bottom: 1.2rem;
    flex-wrap: wrap;
}

.gb-selector label {
    font-size: 0.85rem;
    color: var(--gb-text-muted);
    width: 100%;
    text-align: center;
    margin-bottom: 0.4rem;
}

/* --- Modal --- */
.gb-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.65);
    justify-content: center;
    align-items: center;
    z-index: 200;
}

.gb-modal-content {
    background: var(--gb-surface);
    border: 1px solid var(--gb-border);
    border-radius: var(--gb-radius);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--gb-shadow);
    max-width: 400px;
    width: 90%;
}

.gb-modal-content h2 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: var(--gb-accent);
}

.gb-modal-content p {
    color: var(--gb-text-muted);
    margin-bottom: 1.2rem;
}

.gb-modal .close {
    color: var(--gb-text-muted);
    float: right;
    font-size: 1.5rem;
    cursor: pointer;
    transition: color var(--gb-transition);
    line-height: 1;
}

.gb-modal .close:hover {
    color: var(--gb-text);
}

/* --- Status Text --- */
.gb-status {
    font-size: 1rem;
    color: var(--gb-text-muted);
    margin: 0.8rem 0;
}

/* --- Utility --- */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }

/* --- Responsive --- */
@media (max-width: 600px) {
    .game-shell {
        padding: 1.2rem;
        width: 95%;
    }

    .game-shell h1 {
        font-size: 1.3rem;
    }
}

/* --- Focus Visible (Accessibility) --- */
:focus-visible {
    outline: 2px solid var(--gb-accent);
    outline-offset: 2px;
}

/* Hide focus ring for mouse/touch, show for keyboard */
:focus:not(:focus-visible) {
    outline: none;
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
    position: fixed;
    top: -100%;
    left: 1rem;
    padding: 0.6rem 1.2rem;
    background: var(--gb-accent);
    color: var(--gb-bg);
    font-weight: 600;
    border-radius: var(--gb-radius-sm);
    z-index: 300;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 1rem;
}

/* --- Page Entry Animation --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.game-shell {
    animation: fadeInUp 0.4s ease both;
}

/* --- Button Press Effect --- */
.gb-btn:active,
.gb-btn-solid:active {
    transform: scale(0.96);
}

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