/* ABC Experience - Mobile-first responsive styles */

:root {
    --color-bg: #1a1a2e;
    --color-bg-alt: #16213e;
    --color-card: #0f3460;
    --color-accent: #e94560;
    --color-accent-hover: #d63a55;
    --color-text: #eaeaea;
    --color-text-muted: #a0a0a0;
    --color-border: #2d4a6f;
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-letter: Georgia, serif;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-sm);
}

.back-to-church-btn {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    margin-bottom: var(--space-sm);
    background: var(--color-accent);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.back-to-church-btn:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
}

.page-header {
    text-align: center;
    padding: var(--space-lg) var(--space-sm);
    margin-bottom: var(--space-md);
}

.page-header h1 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.subtitle {
    color: var(--color-text-muted);
    font-size: clamp(1rem, 3vw, 1.25rem);
}

.alphabet-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-xs);
    margin-bottom: var(--space-xl);
}

@media (min-width: 375px) { .alphabet-grid { grid-template-columns: repeat(6, 1fr); } }
@media (min-width: 640px) { .alphabet-grid { grid-template-columns: repeat(7, 1fr); gap: var(--space-sm); } }
@media (min-width: 1024px) { .alphabet-grid { grid-template-columns: repeat(9, 1fr); } }

.letter-tile {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-letter);
    font-size: clamp(1.5rem, 6vw, 2.5rem);
    font-weight: 600;
    color: var(--color-text);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.letter-tile:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.letter-tile:active { transform: translateY(0) scale(0.98); }
.letter-tile:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; }

.letter-display { animation: fadeIn var(--transition-normal); }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    margin-bottom: var(--space-md);
    background: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.back-btn:hover { background: var(--color-card); border-color: var(--color-accent); }
.back-btn svg { width: 20px; height: 20px; }

.letter-card {
    background: var(--color-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.letter-giant {
    display: block;
    font-family: var(--font-letter);
    font-size: clamp(5rem, 25vw, 12rem);
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--space-md);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.word-examples {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.word-tag {
    background: var(--color-bg-alt);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 1rem;
}

.word-tag span { color: var(--color-accent); font-weight: 600; }

.audio-hint {
    margin: var(--space-sm) auto 0;
    color: var(--color-text-muted);
    max-width: 32rem;
    font-size: 0.95rem;
}

.audio-status {
    margin-top: var(--space-xs);
    min-height: 1.25rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.audio-controls {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-width: 320px;
    margin: 0 auto;
}

@media (min-width: 640px) {
    .audio-controls { flex-direction: row; justify-content: center; max-width: none; }
}

.audio-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
    -webkit-tap-highlight-color: transparent;
}

.audio-btn:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.audio-btn:active { transform: translateY(0); }
.audio-btn:focus-visible { outline: 3px solid white; outline-offset: -3px; }
.audio-btn svg { width: 24px; height: 24px; flex-shrink: 0; }
.audio-btn.playing { animation: pulse 1s infinite; }

.word-audio-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin: 0.75rem 0;
}

.word-audio-btn {
    font-size: 0.85rem;
    padding: 0.4rem 0.75rem;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 2rem;
    color: var(--color-text);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: background 0.15s;
}
.word-audio-btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.word-audio-btn:hover { background: var(--color-accent); border-color: var(--color-accent); }
.word-audio-btn:active { transform: scale(0.96); }
.word-audio-btn.playing { animation: pulse 1s infinite; }

@keyframes pulse {
    0%, 100% { background: var(--color-accent); }
    50% { background: var(--color-accent-hover); }
}

.word-image-container {
    display: none;
    justify-content: center;
    margin: var(--space-md) 0;
    animation: fadeIn var(--transition-normal);
}

.word-image {
    max-width: 280px;
    max-height: 280px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    object-fit: contain;
}

.word-tag.active-word {
    background: var(--color-accent);
    color: white;
    transform: scale(1.05);
}

.word-tag {
    cursor: pointer;
    transition: all var(--transition-fast);
}

.word-tag:hover {
    background: var(--color-border);
}

.page-footer {
    text-align: center;
    padding: var(--space-lg) var(--space-sm);
    margin-top: var(--space-xl);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--color-border);
}

.hidden { display: none !important; }