/* ===== CSS Variables - Purple Theme ===== */
:root {
    /* Deep Purples */
    --purple-900: #10002B;
    --purple-800: #240046;
    --purple-700: #3C096C;
    --purple-600: #5A189A;
    --purple-500: #7B2CBF;
    --purple-400: #9D4EDD;
    --purple-300: #C77DFF;
    --purple-200: #E0AAFF;
    
    /* Pastels */
    --purple-pastel-1: #FFD6FF;
    --purple-pastel-2: #E7C6FF;
    --purple-pastel-3: #C8B6FF;
    --purple-pastel-4: #B8C0FF;
    --purple-pastel-5: #BBD0FF;
    
    /* Accents */
    --gold: #D4AF37;
    --gold-light: #E8C872;
    --cream: #FFFAF5;
    --white: #FFFFFF;
    
    /* Fonts - Elegant & Readable */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-script: 'Great Vibes', cursive;
    --font-body: 'Lora', 'Palatino Linotype', Palatino, serif;
    --font-sans: 'Nunito Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Touch-optimized spacing */
    --touch-target: 48px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    
    /* Shadows */
    --shadow-soft: 0 4px 20px rgba(16, 0, 43, 0.12);
    --shadow-medium: 0 8px 40px rgba(16, 0, 43, 0.18);
    --shadow-strong: 0 12px 60px rgba(16, 0, 43, 0.25);
}

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

html {
    font-size: 17px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, var(--purple-900) 0%, var(--purple-800) 50%, var(--purple-700) 100%);
    min-height: 100vh;
    min-height: 100dvh;
    color: var(--cream);
    overflow-x: hidden;
    position: relative;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Prevent pull-to-refresh on mobile */
    overscroll-behavior-y: contain;
}

/* ===== Main Container ===== */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 10;
}

/* ===== Header ===== */
.book-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    animation: fadeInDown 1s ease-out;
    padding: 0 var(--spacing-md);
}

.main-title {
    font-family: var(--font-script);
    font-size: clamp(2.2rem, 7vw, 4rem);
    color: var(--gold);
    text-shadow: 0 2px 20px rgba(212, 175, 55, 0.3);
    margin-bottom: var(--spacing-xs);
    font-weight: 400;
    letter-spacing: 0.02em;
}

.subtitle {
    font-family: var(--font-body);
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    font-style: italic;
    color: var(--purple-200);
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
    letter-spacing: 0.03em;
}

.date-badge {
    display: inline-block;
    font-family: var(--font-sans);
    background: linear-gradient(135deg, var(--purple-600), var(--purple-500));
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    box-shadow: var(--shadow-soft);
}

/* ===== Floating Buttons (Touch Optimized) ===== */
.floating-btn {
    position: fixed;
    width: var(--touch-target);
    height: var(--touch-target);
    min-width: 48px;
    min-height: 48px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    box-shadow: var(--shadow-medium);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    /* Touch feedback */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}

.floating-btn:active {
    transform: scale(0.92);
}

@media (hover: hover) {
    .floating-btn:hover {
        transform: scale(1.08);
        box-shadow: var(--shadow-strong);
    }
}

.music-btn {
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: linear-gradient(135deg, var(--purple-500), var(--purple-600));
    color: white;
}

.music-btn.playing {
    background: linear-gradient(135deg, var(--gold), var(--gold-light));
    color: var(--purple-900);
    box-shadow: 0 0 20px rgba(212, 175, 55, 0.4);
}

.confetti-btn {
    top: calc(var(--spacing-md) + 56px);
    right: var(--spacing-md);
    background: linear-gradient(135deg, var(--purple-400), var(--purple-500));
    color: white;
}

.confetti-btn:active {
    transform: scale(0.88);
}

/* ===== Navigation (Touch Optimized) ===== */
.book-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    animation: fadeInUp 1s ease-out 0.5s both;
    padding: 0 var(--spacing-md);
}

.nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    min-width: var(--touch-target);
    min-height: var(--touch-target);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--purple-500), var(--purple-600));
    border: none;
    border-radius: 30px;
    color: white;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: var(--shadow-soft);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}

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

@media (hover: hover) {
    .nav-btn:hover {
        background: linear-gradient(135deg, var(--purple-400), var(--purple-500));
        transform: translateY(-2px);
        box-shadow: var(--shadow-medium);
    }
    
    .nav-btn:active {
        transform: translateY(0);
    }
}

.nav-btn:disabled {
    opacity: 0.4;
    pointer-events: none;
}

.nav-icon {
    font-size: 1.1rem;
    line-height: 1;
}

.page-indicator {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--purple-200);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    letter-spacing: 0.02em;
}

/* ===== Footer ===== */
.site-footer {
    text-align: center;
    padding: 20px;
    color: var(--purple-300);
    font-size: 0.9rem;
    position: relative;
    z-index: 10;
}

/* ===== Hearts & Confetti Containers ===== */
.hearts-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
    overflow: hidden;
}

.confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 100;
    overflow: hidden;
}

/* ===== Responsive (Mobile First) ===== */
@media (max-width: 768px) {
    html {
        font-size: 16px;
    }
    
    .main-container {
        padding: var(--spacing-sm);
    }
    
    .book-header {
        margin-bottom: var(--spacing-md);
    }
    
    .book-nav {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
    }
    
    .nav-btn {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .nav-text {
        display: none;
    }
    
    .floating-btn {
        width: 52px;
        height: 52px;
        font-size: 1.3rem;
    }
    
    .music-btn {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }
    
    .confetti-btn {
        top: calc(var(--spacing-sm) + 60px);
        right: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .page-indicator {
        order: 3;
        width: 100%;
        text-align: center;
        margin-top: var(--spacing-sm);
    }
    
    .main-title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 0.95rem;
    }
}

/* Safe area insets for notched devices */
@supports (padding: env(safe-area-inset-bottom)) {
    .book-nav {
        padding-bottom: env(safe-area-inset-bottom);
    }
    
    .floating-btn.music-btn {
        top: calc(var(--spacing-md) + env(safe-area-inset-top));
    }
}

/* ===== Audio Toast Notification ===== */
.audio-toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: linear-gradient(135deg, var(--purple-700), var(--purple-600));
    color: var(--white);
    padding: 14px 24px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    z-index: 9999;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
    -webkit-tap-highlight-color: transparent;
}

.audio-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.audio-toast.hiding {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
}

.toast-icon {
    width: 24px;
    height: 24px;
    color: var(--gold);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.toast-text {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
}