/* ========================================
   ANIMAÇÃO DE LETRAS - SEÇÃO DE LIVROS
   ======================================== */

/* Ajustes na seção de livros para suportar a animação */
.books-section {
    position: relative;
    background: linear-gradient(135deg, #2c1810 0%, #4a2c1a 50%, #2c1810 100%);
    padding: 4rem 2rem;
    overflow: hidden;
}

/* Canvas de fundo para as letras */
.books-letters-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.3;
}

/* Logo como marca d'água no fundo */
.books-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    background-image: url('../img/logo.webp');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.08;
    z-index: 0;
    animation: logoBreath 8s ease-in-out infinite;
    pointer-events: none;
}

/* Animação sutil de respiração para a logo */
@keyframes logoBreath {

    0%,
    100% {
        opacity: 0.08;
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        opacity: 0.12;
        transform: translate(-50%, -50%) scale(1.05);
    }
}

.books-section::before {
    will-change: transform, opacity;
}

/* Container precisa estar acima do canvas e da logo */
.books-container {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
}

/* Atualizar cores do cabeçalho para contrastar com o fundo escuro */
.books-section .books-header h2 {
    color: #f4e4c1;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.books-section .books-header .divider {
    background: linear-gradient(90deg, transparent, #d4b896, transparent);
}

.books-section .books-header p {
    color: #d4b896;
}

/* Atualizar cores dos botões de navegação */
.books-section .nav-btn {
    background: rgba(255, 255, 255, 0.9);
    border-color: #d4b896;
    color: #3d2817;
}

.books-section .nav-btn:hover {
    background: linear-gradient(135deg, #d4b896, #b89968);
    color: white;
}

/* Indicadores */
.books-section .carousel-indicators .indicator {
    background: #d4b896;
}

.books-section .carousel-indicators .indicator.active {
    background: #f4e4c1;
}

/* ========================================
   ANIMAÇÃO DE ONDA PARA TÍTULO DA SEÇÃO
   ======================================== */

/* Preparar caracteres individuais para animação */
.books-header h2 .book-char {
    display: inline-block;
    opacity: 0;
    animation: formBookLetter 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    white-space: pre;
    will-change: transform, opacity;
}

@keyframes formBookLetter {
    0% {
        opacity: 0;
        transform: translateY(-20px) scale(1.5) rotate(-10deg);
    }

    100% {
        opacity: 1;
        transform: translateY(0) scale(1) rotate(0deg);
    }
}

.books-header h2.wave-active .book-char {
    animation: waveBookLetter 3s ease-in-out infinite;
    animation-delay: calc(var(--char-index) * 0.1s);
    opacity: 1;
    will-change: transform;
    transform: translateY(0);
}

@keyframes waveBookLetter {

    0%,
    100% {
        transform: translateY(0);
    }

    25% {
        transform: translateY(-8px);
    }

    50% {
        transform: translateY(0);
    }
}