/* CSS Custom Properties for consistent theming */
:root {
    --primary-bg: #e8ecf0;
    --secondary-bg: #f5f7fa;
    --jazz-blue: #2c3e50;
    --jazz-gold: #f39c12;
    --jazz-accent: #3498db;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --shadow-light: #ffffff;
    --shadow-dark: #d1d9e6;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    padding-bottom: 60px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    text-align: center;
    padding: 60px 0;
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 25px 40px;
    border-radius: 25px;
    background: var(--primary-bg);
    box-shadow: 
        20px 20px 40px var(--shadow-dark),
        -20px -20px 40px var(--shadow-light);
    position: relative;
    overflow: hidden;
    max-width: 90%;
}

.logo-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #ff9999, #99ff99, #9999ff, #ffff99);
    border-radius: 30px 30px 0 0;
}

.logo {
    font-size: 3rem;
    color: var(--jazz-gold);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
    animation: musicNote 3s ease-in-out infinite;
    flex-shrink: 0;
}

@keyframes musicNote {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(5deg); }
}

.logo-content {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.title {
    font-family: 'Playfair Display', serif;
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--jazz-blue);
    margin-bottom: 5px;
    letter-spacing: 1px;
    text-transform: lowercase;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 300;
    font-style: italic;
}

/* Main Content */
.main-content {
    margin-bottom: 80px;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    padding: 20px 0;
    min-width: 0;
}

/* Book Card Styles */
.book-card {
    background: var(--primary-bg);
    border-radius: 25px;
    padding: 30px;
    box-shadow: 
        15px 15px 30px var(--shadow-dark),
        -15px -15px 30px var(--shadow-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.book-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--text-secondary), var(--text-secondary));
    opacity: 0;
    transition: var(--transition);
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 
        20px 20px 40px var(--shadow-dark),
        -20px -20px 40px var(--shadow-light),
        0 10px 30px rgba(127, 140, 141, 0.2);
}

.book-card:hover::before {
    opacity: 0;
}

.book-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(127, 140, 141, 0.2);
}

.book-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--jazz-blue);
}

.book-icon {
    font-size: 2.5rem;
    opacity: 0.7;
    animation: float 4s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

/* Instruments Grid */
.instruments-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.instrument-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 15px;
    background: var(--primary-bg);
    border-radius: 15px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    border: none;
    cursor: pointer;
    box-shadow: 
        inset 8px 8px 16px var(--shadow-dark),
        inset -8px -8px 16px var(--shadow-light);
    position: relative;
    overflow: hidden;
}

.instrument-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(127, 140, 141, 0.1), transparent);
    transition: var(--transition);
    transform: translate(-50%, -50%);
    border-radius: 50%;
}

.instrument-btn:hover::before {
    width: 200px;
    height: 200px;
}

.instrument-btn:hover {
    transform: translateY(-2px);
    box-shadow: 
        5px 5px 15px var(--shadow-dark),
        -5px -5px 15px var(--shadow-light);
}

.instrument-btn:active {
    transform: translateY(1px);
    box-shadow: 
        inset 12px 12px 20px var(--shadow-dark),
        inset -12px -12px 20px var(--shadow-light);
}

.key {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--jazz-blue);
    margin-bottom: 5px;
    position: relative;
    z-index: 2;
}

.instrument {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
    position: relative;
    z-index: 2;
}

/* Disabled state */
.instrument-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.instrument-btn.disabled .key {
    color: var(--text-secondary);
}

/* Vocal Section */
.vocal-section {
    display: flex;
    justify-content: center;
}

.vocal-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px 40px;
    background: var(--primary-bg);
    border-radius: 20px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    box-shadow: 
        inset 10px 10px 20px var(--shadow-dark),
        inset -10px -10px 20px var(--shadow-light);
    position: relative;
    overflow: hidden;
    width: 100%;
    max-width: 300px;
}

.vocal-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(127, 140, 141, 0.1), transparent);
    transition: var(--transition);
    transform: translate(-50%, -50%);
    border-radius: 50%;
}

.vocal-btn:hover::before {
    width: 300px;
    height: 300px;
}

.vocal-btn:hover {
    transform: translateY(-3px);
    box-shadow: 
        8px 8px 20px var(--shadow-dark),
        -8px -8px 20px var(--shadow-light);
}

.vocal-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--jazz-blue);
    margin-bottom: 8px;
    position: relative;
    z-index: 2;
}

.vocal-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    text-align: center;
    position: relative;
    z-index: 2;
}

/* Footer */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center;
    padding: 15px 20px;
    background: rgba(232, 236, 240, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(127, 140, 141, 0.2);
    z-index: 100;
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .logo-section {
        padding: 30px 40px;
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .logo-content {
        text-align: center;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .logo {
        font-size: 2.5rem;
    }
    
    .book-card {
        padding: 25px;
    }
    
    .instruments-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .books-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 40px 0;
    }
    
    .logo-section {
        padding: 20px 25px;
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .logo-content {
        text-align: center;
    }
    
    .title {
        font-size: 1.6rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .logo {
        font-size: 2rem;
    }
    
    .book-title {
        font-size: 1.5rem;
    }
    
    .book-icon {
        font-size: 2rem;
    }
}

/* Loading Animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.book-card {
    animation: fadeInUp 0.6s ease-out forwards;
}

.book-card:nth-child(1) { animation-delay: 0.1s; }
.book-card:nth-child(2) { animation-delay: 0.2s; }
.book-card:nth-child(3) { animation-delay: 0.3s; }
.book-card:nth-child(4) { animation-delay: 0.4s; }

/* Book-specific color themes */
/* Real Book 1 - Pastel Red */
.book-card[data-book="1"]:hover {
    box-shadow: 
        20px 20px 40px var(--shadow-dark),
        -20px -20px 40px var(--shadow-light),
        0 10px 30px rgba(255, 153, 153, 0.4);
}

.book-card[data-book="1"]:hover::before {
    background: linear-gradient(90deg, #ff9999, #ffb3b3);
}

.book-card[data-book="1"] .instrument-btn:nth-child(1):hover::before {
    background: radial-gradient(circle, rgba(255, 153, 153, 0.3), transparent);
}

.book-card[data-book="1"] .instrument-btn:nth-child(2):hover::before {
    background: radial-gradient(circle, rgba(255, 179, 179, 0.3), transparent);
}

.book-card[data-book="1"] .instrument-btn:nth-child(3):hover::before {
    background: radial-gradient(circle, rgba(255, 204, 204, 0.3), transparent);
}

.book-card[data-book="1"] .instrument-btn:nth-child(4):hover::before {
    background: radial-gradient(circle, rgba(255, 230, 230, 0.3), transparent);
}

/* Real Book 2 - Pastel Green */
.book-card[data-book="2"]:hover {
    box-shadow: 
        20px 20px 40px var(--shadow-dark),
        -20px -20px 40px var(--shadow-light),
        0 10px 30px rgba(153, 255, 153, 0.4);
}

.book-card[data-book="2"]:hover::before {
    background: linear-gradient(90deg, #99ff99, #b3ffb3);
}

.book-card[data-book="2"] .instrument-btn:nth-child(1):hover::before {
    background: radial-gradient(circle, rgba(153, 255, 153, 0.3), transparent);
}

.book-card[data-book="2"] .instrument-btn:nth-child(2):hover::before {
    background: radial-gradient(circle, rgba(179, 255, 179, 0.3), transparent);
}

.book-card[data-book="2"] .instrument-btn:nth-child(3):hover::before {
    background: radial-gradient(circle, rgba(204, 255, 204, 0.3), transparent);
}

.book-card[data-book="2"] .instrument-btn:nth-child(4):hover::before {
    background: radial-gradient(circle, rgba(230, 255, 230, 0.3), transparent);
}

/* Real Book 3 - Pastel Blue */
.book-card[data-book="3"]:hover {
    box-shadow: 
        20px 20px 40px var(--shadow-dark),
        -20px -20px 40px var(--shadow-light),
        0 10px 30px rgba(153, 153, 255, 0.4);
}

.book-card[data-book="3"]:hover::before {
    background: linear-gradient(90deg, #9999ff, #b3b3ff);
}

.book-card[data-book="3"] .instrument-btn:nth-child(1):hover::before {
    background: radial-gradient(circle, rgba(153, 153, 255, 0.3), transparent);
}

.book-card[data-book="3"] .instrument-btn:nth-child(2):hover::before {
    background: radial-gradient(circle, rgba(179, 179, 255, 0.3), transparent);
}

.book-card[data-book="3"] .instrument-btn:nth-child(3):hover::before {
    background: radial-gradient(circle, rgba(204, 204, 255, 0.3), transparent);
}

.book-card[data-book="3"] .instrument-btn:nth-child(4):hover::before {
    background: radial-gradient(circle, rgba(230, 230, 255, 0.3), transparent);
}

/* Vocal Real Book - Pastel Yellow */
.book-card[data-book="vocal"]:hover {
    box-shadow: 
        20px 20px 40px var(--shadow-dark),
        -20px -20px 40px var(--shadow-light),
        0 10px 30px rgba(255, 255, 153, 0.4);
}

.book-card[data-book="vocal"]:hover::before {
    background: linear-gradient(90deg, #ffff99, #ffffb3);
}

.book-card[data-book="vocal"] .vocal-btn:hover::before {
    background: radial-gradient(circle, rgba(255, 255, 153, 0.3), transparent);
}
</rewritten_file>