/**
 * Math Birds - CSS Styles
 *
 * Angry Birds-inspired visual design for the math learning game
 */

/* ========================================
   Hidden Attribute Override
   ======================================== */

/* Ensure [hidden] always hides elements even with display styles */
.math-birds [hidden] {
    display: none !important;
}

/* ========================================
   CSS Custom Properties
   ======================================== */

.math-birds {
    /* Primary colors */
    --mb-bird-red: #FF6B6B;
    --mb-bird-red-dark: #CC5555;
    --mb-pig-green: #90EE90;
    --mb-pig-green-dark: #228B22;
    
    /* UI colors */
    --mb-primary: #FF6B6B;
    --mb-primary-hover: #FF5252;
    --mb-secondary: #4CAF50;
    --mb-secondary-hover: #45A049;
    --mb-accent: #FFD700;
    
    /* Backgrounds */
    --mb-sky-light: #87CEEB;
    --mb-sky-dark: #5BA8D0;
    --mb-ground: #8B4513;
    --mb-grass: #228B22;
    
    /* UI backgrounds */
    --mb-panel-bg: rgba(255, 255, 255, 0.95);
    --mb-panel-border: rgba(0, 0, 0, 0.1);
    --mb-overlay-bg: rgba(0, 0, 0, 0.5);
    
    /* Text colors */
    --mb-text: #333333;
    --mb-text-light: #666666;
    --mb-text-inverse: #FFFFFF;
    
    /* Feedback colors */
    --mb-correct: #4CAF50;
    --mb-wrong: #f44336;
    
    /* Sizing */
    --mb-radius: 12px;
    --mb-radius-sm: 8px;
    --mb-radius-lg: 16px;
    
    /* Shadows */
    --mb-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    --mb-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* Dark mode adjustments */
[data-theme="dark"] .math-birds {
    --mb-panel-bg: rgba(30, 30, 30, 0.95);
    --mb-panel-border: rgba(255, 255, 255, 0.1);
    --mb-text: #FFFFFF;
    --mb-text-light: #AAAAAA;
}

/* RTL support */
[dir="rtl"] .math-birds {
    direction: rtl;
}

/* ========================================
   Container
   ======================================== */

.mb-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1rem;
}

/* ========================================
   Screens
   ======================================== */

.mb-screen {
    animation: mb-fade-in 0.3s ease;
}

@keyframes mb-fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Level Selection Screen
   ======================================== */

.mb-level-select {
    text-align: center;
    padding: 1rem;
}

.mb-screen-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    color: var(--mb-primary);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.mb-level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 1rem;
    max-width: 500px;
    margin: 0 auto 2rem;
}

.mb-level-btn {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 1rem 0.5rem;
    background: linear-gradient(135deg, var(--mb-primary), var(--mb-primary-hover));
    border: none;
    border-radius: var(--mb-radius);
    color: var(--mb-text-inverse);
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: var(--mb-shadow);
    min-height: 90px;
}

.mb-level-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: var(--mb-shadow-lg);
}

.mb-level-btn:active:not(:disabled) {
    transform: translateY(0);
}

.mb-level-btn:focus-visible {
    outline: 3px solid var(--mb-accent);
    outline-offset: 2px;
}

.mb-level-btn--locked {
    background: linear-gradient(135deg, #888888, #666666);
    cursor: not-allowed;
    opacity: 0.7;
}

.mb-level-number {
    font-size: 1.75rem;
    line-height: 1;
}

.mb-level-stars {
    font-size: 0.75rem;
    letter-spacing: 2px;
}

.mb-lock-icon {
    position: absolute;
    top: -8px;
    right: -8px;
    font-size: 1.25rem;
}

.mb-stats-bar {
    display: flex;
    justify-content: center;
    gap: 2rem;
    padding: 1rem;
    background: var(--mb-panel-bg);
    border-radius: var(--mb-radius);
    box-shadow: var(--mb-shadow);
}

.mb-stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
}

.mb-stat-icon {
    font-size: 1.5rem;
}

.mb-stat-value {
    font-weight: 700;
    color: var(--mb-primary);
}

/* ========================================
   Game Screen
   ======================================== */

.mb-game-screen {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Game Header */
.mb-game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--mb-panel-bg);
    border-radius: var(--mb-radius);
    box-shadow: var(--mb-shadow);
}

.mb-back-btn {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 0.75rem;
    background: transparent;
    border: 2px solid var(--mb-text-light);
    border-radius: var(--mb-radius-sm);
    color: var(--mb-text);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.mb-back-btn:hover {
    background: var(--mb-primary);
    border-color: var(--mb-primary);
    color: var(--mb-text-inverse);
}

.mb-game-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
}

.mb-level-label {
    color: var(--mb-text-light);
}

.mb-level-number {
    font-weight: 700;
    color: var(--mb-primary);
    font-size: 1.25rem;
}

.mb-score-display {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
}

.mb-score-label {
    color: var(--mb-text-light);
}

.mb-score-value {
    font-weight: 700;
    color: var(--mb-secondary);
    font-size: 1.25rem;
}

.mb-birds-remaining {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 1.1rem;
}

.mb-birds-icon {
    font-size: 1.5rem;
}

.mb-birds-count {
    font-weight: 700;
    color: var(--mb-primary);
}

/* ========================================
   Game Area
   ======================================== */

.mb-game-area {
    position: relative;
    background: linear-gradient(to bottom, var(--mb-sky-light), #E0F6FF);
    border-radius: var(--mb-radius);
    overflow: hidden;
    aspect-ratio: 16 / 9;
    max-height: 450px;
    box-shadow: var(--mb-shadow);
}

#mb-canvas {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    /* Allow drag aiming on touch devices without scrolling the page */
    touch-action: none;
}

/* ========================================
   Math Panel Overlay
   ======================================== */

.mb-math-panel {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--mb-overlay-bg);
    z-index: 10;
}

.mb-math-content {
    background: var(--mb-panel-bg);
    padding: 2rem;
    border-radius: var(--mb-radius-lg);
    box-shadow: var(--mb-shadow-lg);
    text-align: center;
    max-width: 400px;
    width: 90%;
    animation: mb-pop-in 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes mb-pop-in {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.mb-math-instruction {
    color: var(--mb-text-light);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.mb-problem {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: clamp(2rem, 8vw, 3rem);
    font-weight: 700;
    font-family: 'Comic Sans MS', 'Chalkboard', 'Comic Neue', cursive, sans-serif;
}

.mb-operand {
    color: var(--mb-primary);
}

.mb-operator {
    color: var(--mb-text);
}

.mb-equals {
    color: var(--mb-text-light);
}

.mb-answer-display {
    min-width: 1.5em;
    padding: 0.25rem 0.5rem;
    background: #F5F5F5;
    border-radius: var(--mb-radius-sm);
    color: var(--mb-secondary);
}

[data-theme="dark"] .mb-answer-display {
    background: #333333;
}

.mb-answer-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.mb-answer-btn {
    padding: 1rem;
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'Comic Sans MS', 'Chalkboard', 'Comic Neue', cursive, sans-serif;
    background: linear-gradient(135deg, #64B5F6, #42A5F5);
    border: none;
    border-radius: var(--mb-radius);
    color: var(--mb-text-inverse);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 0 #1976D2;
}

.mb-answer-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #1976D2;
}

.mb-answer-btn:active:not(:disabled) {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #1976D2;
}

.mb-answer-btn:focus-visible {
    outline: 3px solid var(--mb-accent);
    outline-offset: 2px;
}

.mb-answer-btn--correct {
    background: linear-gradient(135deg, #66BB6A, #4CAF50) !important;
    box-shadow: 0 4px 0 #388E3C !important;
    animation: mb-correct-pulse 0.5s ease;
}

.mb-answer-btn--wrong {
    background: linear-gradient(135deg, #EF5350, #f44336) !important;
    box-shadow: 0 4px 0 #C62828 !important;
    animation: mb-wrong-shake 0.5s ease;
}

@keyframes mb-correct-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes mb-wrong-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Power Meter */
.mb-power-meter {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.mb-power-label {
    color: var(--mb-text-light);
    font-size: 0.9rem;
}

.mb-power-bar {
    flex: 1;
    height: 20px;
    background: #E0E0E0;
    border-radius: 10px;
    overflow: hidden;
}

[data-theme="dark"] .mb-power-bar {
    background: #444444;
}

.mb-power-fill {
    height: 100%;
    background: var(--mb-secondary);
    border-radius: 10px;
    transition: width 0.3s, background-color 0.3s;
}

.mb-power-value {
    font-weight: 700;
    color: var(--mb-secondary);
    min-width: 50px;
    text-align: right;
}

/* ========================================
   Aiming Instructions
   ======================================== */

.mb-aim-instructions {
    padding: 0.75rem 1rem;
    background: var(--mb-panel-bg);
    border-radius: var(--mb-radius);
    box-shadow: var(--mb-shadow);
    font-size: 0.875rem;
    text-align: center;
    line-height: 1.35;
}

.mb-aim-instructions p {
    margin: 0;
    color: var(--mb-text);
    font-size: 0.875rem;
}

/* ========================================
   Feedback Messages
   ======================================== */

.mb-feedback {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: var(--mb-radius);
    font-size: 1.5rem;
    font-weight: 700;
    z-index: 15;
    animation: mb-pop-in 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.mb-feedback--correct {
    background: var(--mb-correct);
    color: var(--mb-text-inverse);
}

.mb-feedback--wrong {
    background: var(--mb-wrong);
    color: var(--mb-text-inverse);
}

.mb-feedback-icon {
    font-size: 2rem;
}

/* ========================================
   Controls
   ======================================== */

.mb-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--mb-panel-bg);
    border-radius: var(--mb-radius);
    box-shadow: var(--mb-shadow);
    flex-wrap: wrap;
}

.mb-angle-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.mb-angle-control label {
    color: var(--mb-text);
    font-weight: 500;
}

#mb-angle-slider {
    width: 150px;
    accent-color: var(--mb-primary);
}

#mb-angle-value {
    font-weight: 700;
    color: var(--mb-primary);
    min-width: 40px;
}

.mb-launch-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--mb-primary), var(--mb-primary-hover));
    border: none;
    border-radius: var(--mb-radius);
    color: var(--mb-text-inverse);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 0 #B71C1C;
}

.mb-launch-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #B71C1C;
}

.mb-launch-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #B71C1C;
}

.mb-launch-btn:focus-visible {
    outline: 3px solid var(--mb-accent);
    outline-offset: 2px;
}

/* ========================================
   Level Complete Screen
   ======================================== */

.mb-level-complete {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    padding: 1rem;
}

.mb-result-content {
    text-align: center;
    background: var(--mb-panel-bg);
    padding: 2rem;
    border-radius: var(--mb-radius-lg);
    box-shadow: var(--mb-shadow-lg);
    max-width: 400px;
    width: 100%;
    animation: mb-pop-in 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.mb-result-title {
    font-size: 2rem;
    color: var(--mb-primary);
    margin-bottom: 1.5rem;
}

.mb-result-stars {
    margin-bottom: 1.5rem;
    font-size: 3rem;
    letter-spacing: 0.5rem;
}

.mb-star {
    display: inline-block;
    transition: transform 0.3s, opacity 0.3s;
}

.mb-star--earned {
    animation: mb-star-pop 0.5s ease;
}

@keyframes mb-star-pop {
    0% { transform: scale(0); opacity: 0; }
    50% { transform: scale(1.3); }
    100% { transform: scale(1); opacity: 1; }
}

.mb-result-score {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--mb-text);
}

.mb-result-score span:last-child {
    font-weight: 700;
    color: var(--mb-secondary);
}

.mb-result-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    color: var(--mb-text-light);
}

.mb-stat-item span:last-child {
    font-weight: 700;
    color: var(--mb-text);
}

.mb-result-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.mb-btn {
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    border: none;
    border-radius: var(--mb-radius);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.mb-btn--primary {
    background: linear-gradient(135deg, var(--mb-secondary), var(--mb-secondary-hover));
    color: var(--mb-text-inverse);
    box-shadow: 0 4px 0 #2E7D32;
}

.mb-btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #2E7D32;
}

.mb-btn--secondary {
    background: linear-gradient(135deg, var(--mb-primary), var(--mb-primary-hover));
    color: var(--mb-text-inverse);
    box-shadow: 0 4px 0 #B71C1C;
}

.mb-btn--secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #B71C1C;
}

.mb-btn--tertiary {
    background: transparent;
    border: 2px solid var(--mb-text-light);
    color: var(--mb-text);
}

.mb-btn--tertiary:hover {
    background: var(--mb-text-light);
    color: var(--mb-text-inverse);
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 600px) {
    .mb-game-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .mb-back-btn {
        align-self: flex-start;
    }
    
    .mb-game-info,
    .mb-score-display,
    .mb-birds-remaining {
        justify-content: center;
    }
    
    .mb-math-content {
        padding: 1.5rem 1rem;
    }
    
    .mb-problem {
        font-size: 2rem;
    }
    
    .mb-answer-btn {
        padding: 0.75rem;
        font-size: 1.25rem;
    }
    
    .mb-controls {
        flex-direction: column;
    }
    
    .mb-angle-control {
        width: 100%;
        justify-content: center;
    }
    
    #mb-angle-slider {
        flex: 1;
        max-width: 200px;
    }
    
    .mb-launch-btn {
        width: 100%;
        justify-content: center;
    }
    
    .mb-result-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* ========================================
   Reduced Motion
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    .mb-screen,
    .mb-math-content,
    .mb-feedback,
    .mb-result-content,
    .mb-star,
    .mb-aim-instructions {
        animation: none;
    }
    
    .mb-level-btn,
    .mb-answer-btn,
    .mb-launch-btn,
    .mb-btn {
        transition: none;
    }
}

/* ========================================
   Focus Styles
   ======================================== */

.math-birds *:focus-visible {
    outline: 3px solid var(--mb-accent);
    outline-offset: 2px;
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .mb-level-btn,
    .mb-answer-btn,
    .mb-launch-btn,
    .mb-btn {
        border: 2px solid currentColor;
    }
}

/* ========================================
   Help Panel (Modal)
   ======================================== */

/*
   When the help modal is open, keep the header above the overlay so the
   global help toggle can also be used to close the modal.
   We make the rest of the header inert (no pointer events) to preserve
   the modal interaction model.
*/
body.mb-help-open .site-header {
    z-index: 300;
    pointer-events: none;
}

body.mb-help-open #help-toggle {
    pointer-events: auto;
}

.help-panel {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.help-panel[hidden] {
    display: none;
}

.help-content {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    max-width: 560px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    background: var(--color-bg-card);
}

.help-header h2 {
    font-size: var(--font-size-lg);
    margin: 0;
}

.help-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
}

.help-close:hover {
    background: var(--color-bg-alt);
    color: var(--color-text);
}

.help-close:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.help-body {
    padding: var(--space-6);
}

.help-section {
    margin-bottom: var(--space-6);
}

.help-section:last-child {
    margin-bottom: 0;
}

.help-section h3 {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-4);
    color: var(--color-text);
}

.help-steps,
.help-power-list,
.help-stars-list,
.help-tips {
    margin: 0;
    padding-left: var(--space-5);
}

.help-steps li,
.help-power-list li,
.help-stars-list li,
.help-tips li {
    margin-bottom: var(--space-2);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.help-shortcuts {
    margin: 0;
}

.shortcut-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-3);
    padding: var(--space-2) 0;
    border-top: 1px solid var(--color-border);
}

.shortcut-item:first-child {
    border-top: 0;
}

.shortcut-item dt {
    margin: 0;
}

.shortcut-item dd {
    margin: 0;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

@media (max-width: 600px) {
    .help-header {
        padding: var(--space-4);
    }

    .help-body {
        padding: var(--space-4);
    }
}