/* ABC Touch - Styles */
/* Mobile-first design for kids 3-5 years */

:root {
    /* Background & Text */
    --color-bg: #FFF8E7;
    --color-text: #2D3436;
    --color-text-light: #636E72;

    /* Letter Colors (rainbow rotation) */
    --letter-1: #FF6B6B;  /* Rojo coral */
    --letter-2: #4ECDC4;  /* Turquesa */
    --letter-3: #95E1D3;  /* Verde menta */
    --letter-4: #F38181;  /* Rosa */
    --letter-5: #AA96DA;  /* Lila */
    --letter-6: #FCBAD3;  /* Rosa claro */
    --letter-7: #FFE66D;  /* Amarillo */
    --letter-8: #A8D8EA;  /* Azul claro */

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Animation */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;

    /* Sizes */
    --letter-size: 70px;
    --letter-font: 32px;
    --border-radius: 16px;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

/* Screens */
.screen {
    display: none;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    padding: var(--spacing-md);
}

.screen.active {
    display: flex;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.sound-btn {
    width: 48px;
    height: 48px;
    border: none;
    background: white;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    touch-action: manipulation;
}

.sound-btn:active {
    transform: scale(0.95);
}

.sound-btn.muted {
    opacity: 0.5;
}

/* Letter Grid */
.letter-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    flex: 1;
    align-content: start;
    padding: var(--spacing-xs);
}

.letter-btn {
    aspect-ratio: 1;
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--letter-font);
    font-weight: 700;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 0 rgba(0, 0, 0, 0.2);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    touch-action: manipulation;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    min-height: var(--letter-size);
}

.letter-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.2);
}

/* Letter Colors */
.letter-btn:nth-child(8n+1) { background-color: var(--letter-1); }
.letter-btn:nth-child(8n+2) { background-color: var(--letter-2); }
.letter-btn:nth-child(8n+3) { background-color: var(--letter-3); }
.letter-btn:nth-child(8n+4) { background-color: var(--letter-4); }
.letter-btn:nth-child(8n+5) { background-color: var(--letter-5); }
.letter-btn:nth-child(8n+6) { background-color: var(--letter-6); }
.letter-btn:nth-child(8n+7) { background-color: var(--letter-7); }
.letter-btn:nth-child(8n) { background-color: var(--letter-8); }

/* Hint */
.hint {
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-top: var(--spacing-md);
    padding-bottom: var(--spacing-md);
}

/* Detail Screen */
.detail-screen {
    background: linear-gradient(180deg, var(--color-bg) 0%, #FFE8D6 100%);
    justify-content: center;
    align-items: center;
    position: relative;
}

.back-btn {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: white;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    touch-action: manipulation;
    min-height: 48px;
}

.back-btn:active {
    transform: scale(0.98);
}

.detail-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.detail-letter {
    width: 160px;
    height: 160px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 100px;
    font-weight: 700;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    box-shadow: 0 8px 0 rgba(0, 0, 0, 0.2);
    animation: pop-in 0.3s ease-out;
}

@keyframes pop-in {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }
    70% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.detail-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.detail-emoji {
    font-size: 80px;
    animation: bounce 0.5s ease 0.2s both;
}

@keyframes bounce {
    0% {
        transform: scale(0);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
    }
}

.detail-word {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.repeat-btn {
    position: absolute;
    bottom: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: white;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    touch-action: manipulation;
    min-height: 56px;
}

.repeat-btn:active {
    transform: scale(0.98);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Letter Colors for Detail */
.detail-letter[data-color="1"] { background-color: var(--letter-1); }
.detail-letter[data-color="2"] { background-color: var(--letter-2); }
.detail-letter[data-color="3"] { background-color: var(--letter-3); }
.detail-letter[data-color="4"] { background-color: var(--letter-4); }
.detail-letter[data-color="5"] { background-color: var(--letter-5); }
.detail-letter[data-color="6"] { background-color: var(--letter-6); }
.detail-letter[data-color="7"] { background-color: var(--letter-7); }
.detail-letter[data-color="8"] { background-color: var(--letter-8); }

/* Responsive - Tablet */
@media (min-width: 480px) {
    :root {
        --letter-size: 80px;
        --letter-font: 36px;
    }

    .letter-grid {
        gap: var(--spacing-md);
        max-width: 400px;
        margin: 0 auto;
    }

    .detail-letter {
        width: 200px;
        height: 200px;
        font-size: 120px;
    }

    .detail-emoji {
        font-size: 100px;
    }

    .detail-word {
        font-size: 2.5rem;
    }
}

/* Responsive - Desktop */
@media (min-width: 768px) {
    :root {
        --letter-size: 90px;
        --letter-font: 40px;
    }

    .letter-grid {
        grid-template-columns: repeat(5, 1fr);
        max-width: 500px;
    }

    .header h1 {
        font-size: 2rem;
    }
}

/* Large screens */
@media (min-width: 1024px) {
    .letter-grid {
        grid-template-columns: repeat(6, 1fr);
        max-width: 600px;
    }
}

/* Safe area for notched devices */
@supports (padding: env(safe-area-inset-bottom)) {
    .screen {
        padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .detail-letter,
    .detail-emoji {
        animation: none;
    }

    .letter-btn,
    .sound-btn,
    .back-btn,
    .repeat-btn {
        transition: none;
    }
}