/* =====================================================
   BOOK COVER STYLES - GİRİŞ SAYFASI
   ===================================================== */

.book-cover {
    width: 100vw;
    height: 100vh;
    background: var(--bg-gradient);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 20px;
    position: relative;
    overflow: hidden;
}

/* Animated background elements */
.book-cover::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: shimmer 4s ease-in-out infinite;
    pointer-events: none;
}

@keyframes shimmer {
    0%, 100% { transform: rotate(0deg) scale(1); opacity: 0.3; }
    50% { transform: rotate(180deg) scale(1.1); opacity: 0.7; }
}

.book-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(36px, 8vw, 56px);
    font-weight: 900;
    color: white;
    text-shadow: 2px 2px 20px rgba(0,0,0,0.8);
    margin-bottom: 15px;
    letter-spacing: 2px;
    line-height: 1.2;
    z-index: 2;
    animation: titleGlow 3s ease-in-out infinite;
}

@keyframes titleGlow {
    0%, 100% { text-shadow: 2px 2px 20px rgba(0,0,0,0.8); }
    50% { text-shadow: 2px 2px 30px rgba(255,255,255,0.5), 0 0 40px rgba(255,255,255,0.3); }
}

.book-subtitle {
    font-size: clamp(18px, 4vw, 28px);
    font-weight: 400;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 1px 1px 10px rgba(0,0,0,0.7);
    margin-bottom: 20px;
    z-index: 2;
    font-style: italic;
    letter-spacing: 1px;
}

.book-heart {
    font-size: clamp(40px, 8vw, 60px);
    margin-bottom: 40px;
    z-index: 2;
    animation: heartBeat 2s ease-in-out infinite;
    text-shadow: 0 0 20px rgba(255, 107, 157, 0.8);
}

@keyframes heartBeat {
    0%, 100% { transform: scale(1); }
    14% { transform: scale(1.1); }
    28% { transform: scale(1); }
    42% { transform: scale(1.1); }
    70% { transform: scale(1); }
}

.start-btn {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(20px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 18px 36px;
    border-radius: 50px;
    font-size: clamp(16px, 3vw, 20px);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    text-shadow: 1px 1px 5px rgba(0,0,0,0.5);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    overflow: hidden;
}

.start-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.start-btn:hover::before {
    left: 100%;
}

.start-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 15px 35px rgba(0,0,0,0.4);
}

.start-btn:active {
    transform: translateY(-1px) scale(1.02);
}

.start-btn i {
    font-size: 18px;
    animation: bookOpen 2s ease-in-out infinite;
}

@keyframes bookOpen {
    0%, 100% { transform: rotateY(0deg); }
    50% { transform: rotateY(20deg); }
}

/* Floating particles effect */
.book-cover::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.3)"/><circle cx="80" cy="40" r="1" fill="rgba(255,255,255,0.2)"/><circle cx="40" cy="80" r="1.5" fill="rgba(255,255,255,0.4)"/><circle cx="90" cy="90" r="1" fill="rgba(255,255,255,0.3)"/><circle cx="10" cy="60" r="2" fill="rgba(255,255,255,0.2)"/></svg>') repeat;
    animation: float 20s linear infinite;
    pointer-events: none;
    opacity: 0.6;
}

@keyframes float {
    from { transform: translateY(100vh) translateX(0px); }
    to { transform: translateY(-100vh) translateX(100px); }
}

/* Mobile optimization */
@media (max-width: 480px) {
    .book-cover {
        padding: 30px 15px;
    }
    
    .book-title {
        margin-bottom: 10px;
    }
    
    .book-subtitle {
        margin-bottom: 15px;
    }
    
    .book-heart {
        margin-bottom: 30px;
    }
    
    .start-btn {
        padding: 15px 30px;
        gap: 10px;
    }
}

/* Landscape mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .book-cover {
        padding: 20px 15px;
    }
    
    .book-title {
        margin-bottom: 8px;
    }
    
    .book-subtitle {
        margin-bottom: 10px;
    }
    
    .book-heart {
        margin-bottom: 20px;
    }
}