/* ============================================
   OTB Games — Shared Design System
   Unified visual language for all OTB games
   ============================================ */

/* ============ FONTS ============ */
@font-face {
    font-family: 'Fredoka One';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('fonts/fredoka-one.woff2') format('woff2');
}

@font-face {
    font-family: 'Nunito';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('fonts/nunito-regular.woff2') format('woff2');
}

@font-face {
    font-family: 'Nunito';
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url('fonts/nunito-semibold.woff2') format('woff2');
}

@font-face {
    font-family: 'Nunito';
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url('fonts/nunito-semibold.woff2') format('woff2');
}

/* ============ OTB DESIGN TOKENS ============ */
:root {
    /* Brand colors (shared across all games) */
    --otb-bg-primary: #1a1a2e;
    --otb-bg-secondary: #16213e;
    --otb-bg-tertiary: #0f3460;
    --otb-success: #2ecc71;
    --otb-danger: #e74c3c;
    --otb-warning: #f39c12;
    --otb-coin: #ffd700;
    --otb-xp: #9b59b6;
    --otb-text: #f0f0f0;
    --otb-text-muted: #aaaaaa;
    --otb-text-dim: #888888;
    --otb-border: rgba(255, 255, 255, 0.15);
    --otb-border-active: rgba(255, 255, 255, 0.3);
    --otb-overlay: rgba(0, 0, 0, 0.7);
    --otb-panel: rgba(0, 0, 0, 0.3);
    --otb-panel-solid: #2d2d2d;

    /* Game accent (override per game) */
    --game-accent: #4A90D9;
    --game-accent-dark: #3570B0;
    --game-accent-glow: rgba(74, 144, 217, 0.3);

    /* Typography */
    --otb-font-heading: 'Fredoka One', 'Segoe UI', sans-serif;
    --otb-font-body: 'Nunito', 'Segoe UI', sans-serif;

    /* Spacing & sizing */
    --otb-touch-min: 44px;
    --otb-radius-sm: 8px;
    --otb-radius-md: 16px;
    --otb-radius-lg: 24px;
    --otb-gap-sm: 4px;
    --otb-gap-md: 8px;
    --otb-gap-lg: 16px;
    --otb-gap-xl: 24px;
}

/* ============ OTB BRANDING BADGE ============ */
.otb-badge {
    font-family: var(--otb-font-heading);
    font-size: 0.7rem;
    color: var(--otb-text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: 0.6;
    user-select: none;
    pointer-events: none;
}

/* ============ OTB SHARED BUTTONS ============ */
.otb-btn {
    font-family: var(--otb-font-body);
    font-weight: 700;
    font-size: 1rem;
    color: #fff;
    border: none;
    border-radius: var(--otb-radius-md);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: transform 0.1s, box-shadow 0.1s, filter 0.1s;
    -webkit-tap-highlight-color: transparent;
    min-height: var(--otb-touch-min);
    min-width: var(--otb-touch-min);
    padding: 12px 24px;
    will-change: transform;
}

.otb-btn:active {
    transform: scale(0.93);
    filter: brightness(0.85);
    transition: transform 0.05s, filter 0.05s;
}

.otb-btn:focus-visible {
    outline: 3px solid var(--otb-coin);
    outline-offset: 2px;
}

.otb-btn-primary {
    background: linear-gradient(135deg, var(--game-accent), var(--game-accent-dark));
    box-shadow: 0 4px 15px var(--game-accent-glow);
}

.otb-btn-secondary {
    background: linear-gradient(135deg, var(--otb-bg-tertiary), var(--otb-bg-secondary));
    border: 2px solid var(--game-accent);
    box-shadow: 0 4px 15px rgba(15, 52, 96, 0.4);
}

.otb-btn-small {
    font-size: 0.85rem;
    padding: 8px 16px;
    min-height: 36px;
    letter-spacing: 0.5px;
}

.otb-btn-large {
    font-size: 1.2rem;
    padding: 16px 40px;
    min-width: 200px;
    min-height: 56px;
}

/* ============ OTB PANELS ============ */
.otb-panel {
    background: var(--otb-panel);
    border: 2px solid var(--otb-border);
    border-radius: var(--otb-radius-md);
    padding: var(--otb-gap-lg);
}

.otb-panel-solid {
    background: var(--otb-panel-solid);
    border: 2px solid var(--otb-border);
    border-radius: var(--otb-radius-md);
    padding: var(--otb-gap-lg);
}

/* ============ OTB OVERLAY ============ */
.otb-overlay {
    position: fixed;
    inset: 0;
    background: var(--otb-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
}

/* ============ OTB TOGGLE SWITCH ============ */
.otb-toggle-track {
    width: 60px;
    height: 36px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 18px;
    position: relative;
    transition: background 0.2s;
    cursor: pointer;
    min-width: 60px;
}

.otb-toggle-track.on {
    background: var(--otb-success);
}

.otb-toggle-thumb {
    width: 30px;
    height: 30px;
    background: #fff;
    border-radius: 50%;
    position: absolute;
    top: 3px;
    left: 3px;
    transition: left 0.2s;
}

.otb-toggle-track.on .otb-toggle-thumb {
    left: 27px;
}

/* ============ OTB PROGRESS BAR ============ */
.otb-progress {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.otb-progress-fill {
    height: 100%;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--game-accent), var(--otb-coin));
    transition: width 0.3s ease;
}

/* ============ OTB ACHIEVEMENT TOAST ============ */
.otb-toast {
    position: fixed;
    top: -80px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--otb-panel-solid);
    border: 2px solid var(--otb-coin);
    border-radius: var(--otb-radius-md);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 200;
    max-width: 400px;
    box-shadow: 0 4px 20px rgba(255, 215, 0, 0.3);
    animation: otb-toast-in 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.otb-toast-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.otb-toast-title {
    font-family: var(--otb-font-heading);
    font-size: 0.9rem;
    color: var(--otb-coin);
}

.otb-toast-desc {
    font-family: var(--otb-font-body);
    font-size: 0.75rem;
    color: var(--otb-text-muted);
    margin-top: 2px;
}

@keyframes otb-toast-in {
    0% { top: -80px; }
    100% { top: 16px; }
}

@keyframes otb-toast-out {
    0% { top: 16px; opacity: 1; }
    100% { top: -80px; opacity: 0; }
}

/* ============ OTB SETTINGS LAYOUT ============ */
.otb-settings-group {
    width: 100%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.otb-settings-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--otb-border);
    border-radius: var(--otb-radius-md);
    padding: 12px 16px;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.otb-settings-item:active {
    transform: scale(0.98);
}

.otb-settings-item.on {
    border-color: rgba(46, 204, 113, 0.5);
}

.otb-settings-item-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.otb-settings-icon {
    font-size: 1.4rem;
}

.otb-settings-label {
    font-family: var(--otb-font-body);
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--otb-text);
}

.otb-settings-desc {
    font-family: var(--otb-font-body);
    font-size: 0.7rem;
    color: var(--otb-text-muted);
    margin-top: 2px;
}

/* ============ OTB PARENT DASHBOARD ============ */
.otb-dashboard-section {
    background: var(--otb-panel);
    border: 2px solid var(--otb-border);
    border-radius: var(--otb-radius-md);
    padding: var(--otb-gap-lg);
    margin-bottom: var(--otb-gap-lg);
}

.otb-dashboard-section h3 {
    font-family: var(--otb-font-heading);
    font-size: 1rem;
    color: var(--game-accent);
    margin-bottom: 12px;
    border-bottom: 1px solid var(--otb-border);
    padding-bottom: 8px;
}

.otb-stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    font-family: var(--otb-font-body);
    font-size: 0.9rem;
}

.otb-stat-label {
    color: var(--otb-text-muted);
}

.otb-stat-value {
    font-weight: 700;
    color: var(--otb-text);
}

.otb-stat-value.gold {
    color: var(--otb-coin);
}

.otb-stat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--otb-gap-md);
    text-align: center;
}

.otb-stat-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--otb-radius-sm);
    padding: 10px;
}

.otb-stat-card .label {
    font-family: var(--otb-font-body);
    font-size: 0.7rem;
    color: var(--otb-text-dim);
    display: block;
    margin-bottom: 4px;
}

.otb-stat-card .value {
    font-family: var(--otb-font-heading);
    font-size: 1.2rem;
    color: var(--otb-coin);
}

/* ============ OTB ACCURACY BARS ============ */
.otb-accuracy-bar {
    width: 100px;
    height: 8px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    overflow: hidden;
    display: inline-block;
    vertical-align: middle;
}

.otb-accuracy-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.3s;
}

.otb-accuracy-fill.high { background: var(--otb-success); }
.otb-accuracy-fill.medium { background: var(--otb-warning); }
.otb-accuracy-fill.low { background: var(--otb-danger); }

/* ============ OTB RESULTS STARS ============ */
.otb-stars {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin: 12px 0;
}

.otb-star {
    font-size: 2rem;
    opacity: 0;
    transform: scale(0.5);
    animation: otb-star-pop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.otb-star:nth-child(1) { animation-delay: 0.2s; }
.otb-star:nth-child(2) { animation-delay: 0.4s; }
.otb-star:nth-child(3) { animation-delay: 0.6s; }

.otb-star.earned { color: var(--otb-coin); }
.otb-star.empty { color: #444; }

@keyframes otb-star-pop {
    0% { opacity: 0; transform: scale(0.5); }
    70% { opacity: 1; transform: scale(1.3); }
    100% { opacity: 1; transform: scale(1); }
}

/* ============ OTB SPLASH / LOADING ============ */
.otb-splash {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: linear-gradient(180deg, var(--otb-bg-tertiary) 0%, var(--otb-bg-primary) 60%, var(--otb-bg-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 16px;
    transition: opacity 0.5s ease;
}

.otb-splash-badge {
    position: absolute;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--otb-font-heading);
    font-size: 0.65rem;
    color: var(--otb-text-muted);
    letter-spacing: 3px;
    text-transform: uppercase;
    opacity: 0.5;
}

.otb-splash-title {
    font-family: var(--otb-font-heading);
    font-size: 2rem;
    color: #fff;
    letter-spacing: 3px;
    text-shadow: 0 0 20px var(--game-accent-glow);
}

.otb-splash-subtitle {
    font-family: var(--otb-font-body);
    font-size: 0.85rem;
    color: var(--otb-text-muted);
    letter-spacing: 2px;
}

.otb-splash-loader {
    width: 160px;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    overflow: hidden;
}

.otb-splash-loader-fill {
    width: 40%;
    height: 100%;
    background: linear-gradient(90deg, var(--game-accent), var(--otb-coin));
    border-radius: 2px;
    animation: otb-splash-pulse 1.2s ease-in-out infinite;
}

@keyframes otb-splash-pulse {
    0%, 100% { width: 20%; margin-left: 0; }
    50% { width: 60%; margin-left: 20%; }
}

/* ============ OTB ABOUT SECTION ============ */
.otb-about {
    text-align: center;
    padding: 16px;
    margin-top: 16px;
    border-top: 1px solid var(--otb-border);
}

.otb-about-text {
    font-family: var(--otb-font-body);
    font-size: 0.7rem;
    color: var(--otb-text-dim);
}

.otb-about-version {
    font-family: var(--otb-font-body);
    font-size: 0.6rem;
    color: var(--otb-text-dim);
    opacity: 0.6;
    margin-top: 4px;
}

/* ============ OTB PARENT LOCK ============ */
.otb-parent-lock {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.otb-parent-lock-text {
    font-family: var(--otb-font-body);
    font-size: 0.85rem;
    color: var(--otb-text-muted);
}

.otb-parent-lock-math {
    font-family: var(--otb-font-heading);
    font-size: 1.3rem;
    color: var(--otb-coin);
}

.otb-parent-lock-input {
    font-family: var(--otb-font-body);
    font-size: 1rem;
    background: rgba(0, 0, 0, 0.4);
    color: var(--otb-text);
    border: 2px solid var(--otb-border);
    border-radius: var(--otb-radius-sm);
    padding: 10px;
    width: 120px;
    text-align: center;
    outline: none;
}

.otb-parent-lock-input:focus {
    border-color: var(--game-accent);
}

/* ============ SCREEN TRANSITIONS ============ */
.otb-screen-enter {
    animation: otb-screen-in 0.3s ease-out;
}

@keyframes otb-screen-in {
    from { opacity: 0; transform: scale(0.97) translateY(8px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

/* ============ SHARED HEADING STYLES ============ */
.otb-heading {
    font-family: var(--otb-font-heading);
    color: var(--otb-text);
}

.otb-heading-accent {
    font-family: var(--otb-font-heading);
    color: var(--game-accent);
}

.otb-heading-gold {
    font-family: var(--otb-font-heading);
    color: var(--otb-coin);
}

.otb-body {
    font-family: var(--otb-font-body);
    color: var(--otb-text);
}

.otb-body-muted {
    font-family: var(--otb-font-body);
    color: var(--otb-text-muted);
}