/**
 * Alphabet Number Learning Game - Professional Modern Design
 * Clean, minimalist aesthetic with blues, grays, and professional styling
 */

/* ==================== CSS VARIABLES ==================== */
:root {
    /* Primary Colors - Professional Blues */
    --ang-primary: #2563eb;           /* Blue 600 */
    --ang-primary-dark: #1e40af;      /* Blue 700 */
    --ang-primary-light: #60a5fa;     /* Blue 400 */
    --ang-primary-lighter: #dbeafe;   /* Blue 100 */
    
    /* Neutral Colors - Professional Grays */
    --ang-gray-50: #f9fafb;
    --ang-gray-100: #f3f4f6;
    --ang-gray-200: #e5e7eb;
    --ang-gray-300: #d1d5db;
    --ang-gray-400: #9ca3af;
    --ang-gray-500: #6b7280;
    --ang-gray-600: #4b5563;
    --ang-gray-700: #374151;
    --ang-gray-800: #1f2937;
    --ang-gray-900: #111827;
    
    /* Accent Colors */
    --ang-success: #10b981;           /* Green 500 */
    --ang-success-light: #d1fae5;     /* Green 100 */
    --ang-error: #ef4444;             /* Red 500 */
    --ang-error-light: #fee2e2;       /* Red 100 */
    --ang-warning: #f59e0b;           /* Amber 500 */
    --ang-info: #3b82f6;              /* Blue 500 */
    
    /* Shadows */
    --ang-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --ang-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --ang-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --ang-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --ang-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Typography */
    --ang-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --ang-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;
    
    /* Transitions */
    --ang-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --ang-transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== GLOBAL STYLES ==================== */
* {
    box-sizing: border-box;
}

.ang-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    font-family: var(--ang-font-family);
    background: var(--ang-gray-50);
    border-radius: 12px;
    min-height: 600px;
}

.ang-screen {
    background: white;
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: var(--ang-shadow-lg);
    animation: fadeInSlide 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--ang-gray-200);
}

.ang-hidden {
    display: none !important;
}

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

/* ==================== TYPOGRAPHY ==================== */
.ang-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    color: var(--ang-gray-900);
    letter-spacing: -0.025em;
}

.ang-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--ang-gray-600);
    margin-bottom: 2rem;
    font-weight: 400;
}

.ang-screen-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 1rem 0;
    color: var(--ang-primary);
    letter-spacing: -0.025em;
}

.ang-instruction {
    text-align: center;
    font-size: 1rem;
    color: var(--ang-gray-600);
    margin-bottom: 1.5rem;
    font-weight: 500;
    line-height: 1.5;
}

/* ==================== MODE SELECTION ==================== */
.ang-mode-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
    margin-top: 2rem;
}

.ang-mode-btn {
    background: white;
    border: 2px solid var(--ang-gray-200);
    border-radius: 12px;
    padding: 2rem 1.5rem;
    cursor: pointer;
    transition: var(--ang-transition);
    box-shadow: var(--ang-shadow-sm);
    text-align: center;
    color: var(--ang-gray-900);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    position: relative;
    overflow: hidden;
}

.ang-mode-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--ang-primary), var(--ang-primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.ang-mode-btn:hover {
    transform: translateY(-4px);
    box-shadow: var(--ang-shadow-lg);
    border-color: var(--ang-primary);
}

.ang-mode-btn:hover::before {
    transform: scaleX(1);
}

.ang-mode-btn:active {
    transform: translateY(-2px);
}

.ang-mode-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    filter: grayscale(0.3);
    transition: filter 0.3s ease;
}

.ang-mode-btn:hover .ang-mode-icon {
    filter: grayscale(0);
}

.ang-mode-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--ang-gray-900);
}

.ang-mode-desc {
    font-size: 0.875rem;
    color: var(--ang-gray-600);
    line-height: 1.5;
}

/* ==================== GAME STATS ==================== */
.ang-game-stats {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.25rem;
    background: var(--ang-gray-50);
    border-radius: 10px;
    border: 1px solid var(--ang-gray-200);
}

.ang-stat {
    font-size: 1rem;
    font-weight: 600;
    color: var(--ang-gray-700);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.ang-stat span {
    color: var(--ang-primary);
    font-weight: 700;
}

/* ==================== TILE SYSTEM - PROFESSIONAL DESIGN ==================== */
.ang-tile-btn,
.ang-magnet-btn {
    min-width: 70px;
    min-height: 70px;
    border: 2px solid var(--ang-gray-200);
    border-radius: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ang-gray-900);
    cursor: pointer;
    transition: var(--ang-transition-fast);
    box-shadow: var(--ang-shadow);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
}

.ang-tile-btn:hover:not(:disabled),
.ang-magnet-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--ang-shadow-md);
    border-color: var(--ang-primary);
    background: var(--ang-primary-lighter);
}

.ang-tile-btn:active:not(:disabled),
.ang-magnet-btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--ang-shadow-sm);
}

/* Letter and number display in tiles */
.ang-magnet-btn .ang-tile-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--ang-primary);
}

.ang-magnet-btn .ang-tile-number {
    position: absolute;
    top: 4px;
    right: 6px;
    font-size: 0.583em; /* 1/3 of the letter size (1.75em / 3 ≈ 0.583em) */
    font-weight: 700;
    color: var(--ang-gray-600);
    z-index: 10;
    animation: numberAppear 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    background: white;
    padding: 2px 4px;
    border-radius: 4px;
    box-shadow: var(--ang-shadow-sm);
}

@keyframes numberAppear {
    from {
        transform: scale(0) rotate(-180deg);
        opacity: 0;
    }
    to {
        transform: scale(1) rotate(0);
        opacity: 1;
    }
}

.ang-magnet-btn.ang-error {
    animation: shake 0.4s ease-in-out;
    background: var(--ang-error-light) !important;
    border-color: var(--ang-error) !important;
}

.ang-magnet-btn.ang-clicked {
    opacity: 0.4;
    transform: scale(0.95);
    background: var(--ang-gray-100);
    border-color: var(--ang-gray-300);
    cursor: not-allowed;
}

.ang-magnet-btn:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

/* ==================== GRID LAYOUTS ==================== */
.ang-number-grid,
.ang-letter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 1rem;
    padding: 1.5rem;
    background: var(--ang-gray-50);
    border-radius: 12px;
    border: 1px solid var(--ang-gray-200);
    margin: 1.5rem 0;
}

/* ==================== SEQUENCE BUILDER ==================== */
.ang-sequence-builder {
    margin: 1.5rem 0;
    padding: 1.25rem;
    background: white;
    border-radius: 12px;
    border: 2px solid var(--ang-primary-lighter);
    box-shadow: var(--ang-shadow);
}

.ang-sequence-title {
    font-size: 1.125rem;
    color: var(--ang-gray-900);
    margin: 0 0 1rem 0;
    text-align: center;
    font-weight: 600;
    letter-spacing: -0.025em;
}

.ang-sequence-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1rem;
    min-height: 80px;
    background: var(--ang-gray-50);
    border-radius: 8px;
    justify-content: center;
    align-items: center;
    border: 1px dashed var(--ang-gray-300);
}

.ang-sequence-tile {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    box-shadow: var(--ang-shadow-md);
    animation: tileAppear 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    background: white;
    border: 2px solid var(--ang-primary);
}

@keyframes tileAppear {
    from {
        transform: scale(0) rotate(-90deg);
        opacity: 0;
    }
    to {
        transform: scale(1) rotate(0);
        opacity: 1;
    }
}

.ang-sequence-tile .ang-tile-letter {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ang-primary);
}

.ang-sequence-tile .ang-tile-number {
    position: absolute;
    top: 2px;
    right: 4px;
    font-size: 0.5em; /* 1/3 of the letter size (1.5em / 3 = 0.5em) */
    font-weight: 700;
    color: var(--ang-gray-600);
    z-index: 10;
    background: white;
    padding: 1px 3px;
    border-radius: 3px;
    box-shadow: var(--ang-shadow-sm);
}

/* ==================== TRAINING MODE ==================== */
.ang-group-selection {
    text-align: center;
    padding: 3rem 1.5rem;
}

.ang-group-selection p {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--ang-gray-900);
    margin-bottom: 1.5rem;
}

.ang-group-btn {
    background: white;
    border: 2px solid var(--ang-gray-200);
    border-radius: 10px;
    padding: 1rem 2rem;
    margin: 0 0.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--ang-gray-900);
    cursor: pointer;
    box-shadow: var(--ang-shadow);
    transition: var(--ang-transition);
    font-family: var(--ang-font-family);
}

.ang-group-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--ang-shadow-lg);
    border-color: var(--ang-primary);
    background: var(--ang-primary-lighter);
}

.ang-card {
    background: linear-gradient(135deg, var(--ang-primary), var(--ang-primary-dark));
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    margin: 1.5rem auto;
    max-width: 400px;
    box-shadow: var(--ang-shadow-xl);
    color: white;
}

.ang-question-text {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
    opacity: 0.95;
}

.ang-question-value {
    font-size: 4rem;
    font-weight: 700;
    animation: scaleIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes scaleIn {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.ang-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 500px;
    margin: 0 auto;
}

.ang-option-btn {
    background: white;
    border: 2px solid var(--ang-gray-200);
    border-radius: 10px;
    padding: 1.5rem 1rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ang-gray-900);
    cursor: pointer;
    box-shadow: var(--ang-shadow);
    transition: var(--ang-transition-fast);
    position: relative;
    font-family: var(--ang-font-family);
}

.ang-option-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--ang-shadow-lg);
    border-color: var(--ang-primary);
    background: var(--ang-primary-lighter);
}

.ang-option-btn:active:not(:disabled) {
    transform: translateY(0);
}

.ang-option-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.ang-option-btn.ang-correct {
    background: var(--ang-success-light);
    border-color: var(--ang-success);
}

.ang-option-btn.ang-incorrect {
    background: var(--ang-error-light);
    border-color: var(--ang-error);
}

/* ==================== MATCHING GAME ==================== */
.ang-matching-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 1rem;
    padding: 1.5rem;
}

.ang-match-card {
    aspect-ratio: 1;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--ang-gray-900);
    cursor: pointer;
    box-shadow: var(--ang-shadow);
    transition: var(--ang-transition-fast);
    background: white;
    border: 2px solid var(--ang-gray-200);
}

.ang-match-card:hover:not(.ang-matched) {
    transform: translateY(-4px) scale(1.05);
    box-shadow: var(--ang-shadow-lg);
    border-color: var(--ang-primary);
    background: var(--ang-primary-lighter);
}

.ang-match-card.ang-selected {
    transform: scale(1.08);
    box-shadow: 0 0 0 3px var(--ang-primary-light);
    border-color: var(--ang-primary);
    background: var(--ang-primary-lighter);
}

.ang-match-card.ang-matched {
    opacity: 0.4;
    cursor: default;
    background: var(--ang-gray-100);
    border-color: var(--ang-gray-300);
    transform: scale(0.95);
}

/* ==================== SPEED QUIZ ==================== */
.ang-speed-card {
    background: linear-gradient(135deg, var(--ang-primary), var(--ang-primary-dark));
    border-radius: 12px;
    padding: 4rem 2rem;
    text-align: center;
    margin: 1.5rem auto;
    max-width: 400px;
    box-shadow: var(--ang-shadow-xl);
}

.ang-speed-letter,
.ang-speed-number {
    font-size: 5rem;
    font-weight: 700;
    color: white;
    animation: zoomIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes zoomIn {
    from {
        transform: scale(0.5);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.ang-speed-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 500px;
    margin: 1.5rem auto;
}

.ang-speed-btn {
    background: white;
    border: 2px solid var(--ang-gray-200);
    border-radius: 10px;
    padding: 1.5rem 1rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ang-gray-900);
    cursor: pointer;
    box-shadow: var(--ang-shadow);
    transition: var(--ang-transition-fast);
    position: relative;
    font-family: var(--ang-font-family);
}

.ang-speed-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--ang-shadow-lg);
    border-color: var(--ang-primary);
    background: var(--ang-primary-lighter);
}

/* ==================== FEEDBACK ==================== */
.ang-feedback {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    font-size: 3rem;
    font-weight: 700;
    z-index: 1000;
    pointer-events: none;
    transition: var(--ang-transition);
}

.ang-feedback.ang-feedback-show {
    transform: translate(-50%, -50%) scale(2);
    opacity: 0;
}

.ang-feedback-correct {
    color: var(--ang-success);
    filter: drop-shadow(0 2px 8px rgba(16, 185, 129, 0.5));
}

.ang-feedback-incorrect {
    color: var(--ang-error);
    filter: drop-shadow(0 2px 8px rgba(239, 68, 68, 0.5));
}

/* ==================== RESULTS SCREEN ==================== */
.ang-results-card {
    background: white;
    border: 2px solid var(--ang-gray-200);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem auto;
    max-width: 500px;
    box-shadow: var(--ang-shadow-lg);
}

.ang-result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    margin: 0.75rem 0;
    background: var(--ang-gray-50);
    border-radius: 8px;
    border: 1px solid var(--ang-gray-200);
}

.ang-result-label {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--ang-gray-700);
}

.ang-result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ang-primary);
}

.ang-name-entry {
    text-align: center;
    margin: 2rem 0;
}

.ang-name-entry input {
    width: 100%;
    max-width: 400px;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--ang-gray-200);
    border-radius: 8px;
    margin-bottom: 1rem;
    font-family: var(--ang-font-family);
    transition: var(--ang-transition);
}

.ang-name-entry input:focus {
    outline: none;
    border-color: var(--ang-primary);
    box-shadow: 0 0 0 3px var(--ang-primary-lighter);
}

/* ==================== LEADERBOARD ==================== */
.ang-leaderboard {
    margin: 2rem 0;
}

.ang-leaderboard h3 {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ang-gray-900);
    margin-bottom: 1.5rem;
}

.ang-leaderboard-table {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    border-collapse: separate;
    border-spacing: 0;
    box-shadow: var(--ang-shadow);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--ang-gray-200);
}

.ang-leaderboard-table thead {
    background: linear-gradient(135deg, var(--ang-primary), var(--ang-primary-dark));
    color: white;
}

.ang-leaderboard-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ang-leaderboard-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--ang-gray-200);
    color: var(--ang-gray-700);
}

.ang-leaderboard-table tbody tr {
    background: white;
    transition: background 0.15s ease;
}

.ang-leaderboard-table tbody tr:nth-child(odd) {
    background: var(--ang-gray-50);
}

.ang-leaderboard-table tbody tr:hover {
    background: var(--ang-primary-lighter);
}

.ang-leaderboard-table tbody tr:last-child td {
    border-bottom: none;
}

.ang-no-scores {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--ang-gray-500);
    font-size: 1.125rem;
}

/* ==================== BUTTONS ==================== */
.ang-primary-btn,
.ang-secondary-btn,
.ang-back-btn {
    border: none;
    border-radius: 8px;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--ang-transition);
    box-shadow: var(--ang-shadow);
    margin: 0.5rem 0.25rem;
    font-family: var(--ang-font-family);
}

.ang-primary-btn {
    background: var(--ang-primary);
    color: white;
    border: 2px solid var(--ang-primary);
}

.ang-primary-btn:hover {
    background: var(--ang-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--ang-shadow-lg);
}

.ang-secondary-btn {
    background: white;
    color: var(--ang-gray-900);
    border: 2px solid var(--ang-gray-300);
}

.ang-secondary-btn:hover {
    background: var(--ang-gray-50);
    border-color: var(--ang-gray-400);
    transform: translateY(-2px);
    box-shadow: var(--ang-shadow-lg);
}

.ang-back-btn {
    background: white;
    color: var(--ang-gray-700);
    border: 2px solid var(--ang-gray-300);
}

.ang-back-btn:hover {
    background: var(--ang-gray-100);
    border-color: var(--ang-gray-400);
}

.ang-primary-btn:active,
.ang-secondary-btn:active,
.ang-back-btn:active {
    transform: translateY(0);
    box-shadow: var(--ang-shadow-sm);
}

.ang-primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.ang-result-buttons {
    text-align: center;
    margin-top: 2rem;
}

/* ==================== ANIMATIONS ==================== */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

.ang-shake {
    animation: shake 0.4s ease-in-out;
}

@keyframes celebrate {
    0%, 100% { transform: scale(1) rotate(0deg); }
    25% { transform: scale(1.05) rotate(-3deg); }
    75% { transform: scale(1.05) rotate(3deg); }
}

.ang-celebrate {
    animation: celebrate 0.6s ease-in-out;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 768px) {
    .ang-container {
        padding: 1.5rem;
    }
    
    .ang-screen {
        padding: 1.5rem;
    }
    
    .ang-title {
        font-size: 2rem;
    }
    
    .ang-screen-title {
        font-size: 1.75rem;
    }
    
    .ang-mode-buttons {
        grid-template-columns: 1fr;
    }
    
    .ang-game-stats {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .ang-stat {
        font-size: 0.875rem;
    }
    
    .ang-tile-btn,
    .ang-magnet-btn {
        min-width: 60px;
        min-height: 60px;
        font-size: 1.25rem;
    }
    
    .ang-magnet-btn .ang-tile-letter {
        font-size: 1.5rem;
    }
    
    .ang-number-grid,
    .ang-letter-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
        gap: 0.75rem;
        padding: 1rem;
    }
    
    .ang-sequence-tile {
        width: 50px;
        height: 50px;
    }
    
    .ang-sequence-tile .ang-tile-letter {
        font-size: 1.25rem;
    }
    
    .ang-question-value {
        font-size: 3rem;
    }
    
    .ang-options {
        grid-template-columns: 1fr;
    }
    
    .ang-option-btn {
        font-size: 1.25rem;
        padding: 1.25rem 1rem;
    }
    
    .ang-matching-container {
        grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    }
    
    .ang-match-card {
        font-size: 1.5rem;
    }
    
    .ang-speed-letter,
    .ang-speed-number {
        font-size: 4rem;
    }
    
    .ang-speed-options {
        grid-template-columns: 1fr;
    }
    
    .ang-group-btn {
        display: block;
        width: 100%;
        margin: 0.5rem 0;
    }
    
    .ang-leaderboard-table {
        font-size: 0.875rem;
    }
    
    .ang-leaderboard-table th,
    .ang-leaderboard-table td {
        padding: 0.75rem 0.5rem;
    }
}

@media (max-width: 480px) {
    .ang-container {
        padding: 1rem;
    }
    
    .ang-screen {
        padding: 1.25rem;
    }
    
    .ang-title {
        font-size: 1.75rem;
    }
    
    .ang-subtitle {
        font-size: 1rem;
    }
    
    .ang-screen-title {
        font-size: 1.5rem;
    }
    
    .ang-tile-btn,
    .ang-magnet-btn {
        min-width: 50px;
        min-height: 50px;
        font-size: 1rem;
    }
    
    .ang-magnet-btn .ang-tile-letter {
        font-size: 1.25rem;
    }
    
    .ang-number-grid,
    .ang-letter-grid {
        grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
        gap: 0.5rem;
    }
    
    .ang-sequence-tile {
        width: 45px;
        height: 45px;
    }
    
    .ang-sequence-tile .ang-tile-letter {
        font-size: 1.125rem;
    }
    
    .ang-question-value {
        font-size: 2.5rem;
    }
    
    .ang-speed-letter,
    .ang-speed-number {
        font-size: 3rem;
    }
    
    .ang-mode-btn {
        padding: 1.5rem 1rem;
    }
    
    .ang-mode-icon {
        font-size: 2.5rem;
    }
}

/* ==================== UTILITY CLASSES ==================== */
.ang-text-center {
    text-align: center;
}

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

.ang-loading {
    opacity: 0.6;
    pointer-events: none;
}

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

/* Focus styles for keyboard navigation */
.ang-mode-btn:focus,
.ang-tile-btn:focus,
.ang-magnet-btn:focus,
.ang-option-btn:focus,
.ang-speed-btn:focus,
.ang-primary-btn:focus,
.ang-secondary-btn:focus,
.ang-back-btn:focus {
    outline: 3px solid var(--ang-primary-light);
    outline-offset: 2px;
}