:root {
    --bg-color: #F5EFE6;
    --text-color: #4E443A;
    --accent-color: #A1887F;
    --accent-color-interactive: #9A3B3B;
    --card-bg-color: #FDFBF7;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --border-color: #D7CCC8;
    --star-inactive-color: #D1C4E9;
    --star-active-color: #FFC107;
    --font-title: 'Lora', serif;
    --font-body: 'Lato', sans-serif;
    --transition-speed: 0.3s;
}

body.dark-mode { 
    --bg-color: #1A202C;
    --text-color: #E2E8F0;
    --accent-color: #718096;
    --accent-color-interactive: #60A5FA;
    --card-bg-color: #2D3748;
    --shadow-color: rgba(0, 0, 0, 0.25);
    --border-color: #4A5568;
}

/* ======== GLOBAL & RESET ======== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    margin: 0;
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Bloquea scroll cuando hay un modal abierto */
body:has(dialog[open]) { overflow: hidden; }

main { padding: 2rem; }
section { margin-block-end: 3rem; }
h2 { font-family: var(--font-title); border-block-end: 2px solid var(--accent-color); padding-block-end: 0.5rem; margin-block-end: 1.5rem; }

/* ======== HEADER ======== */
.site-header {
    background-color: #4E443A;
    border-bottom: 2px solid var(--accent-color);
    padding: 1rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-main { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; width: 100%; gap: 1rem; }
#site-title { color: var(--bg-color); font-family: var(--font-title); margin: 0; font-size: clamp(1.5rem, 4vw, 2rem); }

.header-controls { display: flex; gap: 0.5rem; }
.header-controls button {
    background-color: transparent; border: 2px solid #a1887f; color: white; padding: 0.5rem 1rem;
    border-radius: 5px; cursor: pointer; font-family: var(--font-body); font-weight: 700;
    transition: background-color var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed);
}
.header-controls button:hover, .header-controls button:focus-visible { background-color: var(--accent-color-interactive); border-color: var(--accent-color-interactive); outline: none; }
#add-book-btn { background-color: var(--accent-color-interactive); border-color: var(--accent-color-interactive); }

.header-search { width: 100%; }
#search-bar { width: 100%; padding: 0.75rem 1rem; font-size: 1rem; border-radius: 5px; border: 2px solid var(--border-color); background-color: var(--bg-color); color: var(--text-color); transition: border-color var(--transition-speed); }
#search-bar:focus { outline: none; border-color: var(--accent-color-interactive); }

/* ======== GRID DE LIBROS ======== */
.books-container { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1.5rem; min-height: 150px; }

.book { background-color: var(--card-bg-color); border-radius: 8px; box-shadow: 0 4px 12px var(--shadow-color); overflow: hidden; position: relative; display: flex; flex-direction: column; transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease; }
.book.hidden { display: none; }
.book:hover { transform: translateY(-5px); box-shadow: 0 8px 20px var(--shadow-color); }
.book-cover { width: 100%; aspect-ratio: 2 / 3; object-fit: cover; display: block; background-color: var(--border-color); cursor: pointer; }
.book-info { padding: 1rem; display: flex; flex-direction: column; flex-grow: 1; cursor: pointer; }
.book h3 { font-family: var(--font-title); margin: 0 0 0.25rem 0; font-size: 1.1rem; }
.book .author { margin: 0; color: var(--accent-color); font-size: 0.9rem; flex-grow: 1; margin-block-end: 0.5rem; }
.book-extra-info { margin-block-start: auto; font-size: 0.9rem; }

.rating-stars { display: flex; gap: 0.25rem; }
.rating-stars .star { font-size: 1.5rem; color: var(--star-inactive-color); background: none; border: none; padding: 0; cursor: pointer; }
.rating-stars .star.filled { color: var(--star-active-color); }

/* ======== VISTA DE LISTA ======== */
.list-view .books-container { display: flex; flex-direction: column; gap: 1rem; }
.list-view .book { flex-direction: row; align-items: center; max-width: 800px; }
.list-view .book-cover { width: 80px; height: 120px; flex-shrink: 0; }
.list-view .book-info { padding: 0.5rem 1.5rem; }

/* ======== MODALES Y FORMULARIOS (GENERAL) ======== */
dialog {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    background: var(--card-bg-color);
    color: var(--text-color);
    max-width: 500px;
    width: 90%;
}
dialog::backdrop { background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(4px); }

form { display: flex; flex-direction: column; gap: 1rem; }
form h2 { margin: 0 0 1rem; border: none; }
form label { font-weight: bold; }
form input, form select { width: 100%; padding: 0.75rem; border-radius: 5px; border: 2px solid var(--border-color); background: var(--bg-color); color: var(--text-color); }
form input:focus, form select:focus { outline: none; border-color: var(--accent-color-interactive); }

.modal-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 1.5rem; gap: 1rem; }
.modal-actions button { flex-shrink: 0; padding: 0.75rem; border-radius: 5px; cursor: pointer; border: none; font-weight: bold; }
.modal-actions-right { display: flex; gap: 1rem; }
.modal-actions .btn-primary { background: var(--accent-color-interactive); color: white; }
.modal-actions .btn-cancel { background: transparent; border: 2px solid var(--border-color); color: var(--text-color); }
.btn-danger { background-color: #E53E3E; color: white; padding: 0.75rem; border-radius: 5px; font-weight: bold; cursor: pointer; }
.btn-danger:hover { background-color: #C53030; }

/* ======== MODAL DETALLE LIBRO (CORREGIDO) ======== */
/* 1. Estilos base del modal (sin display) */
#book-detail-modal { 
    padding: 0; 
    max-width: 800px; 
    width: 95%;       
    max-height: 85vh; 
    overflow: hidden; 
    border-radius: 12px;
    /* ELIMINADO: display: flex; y flex-direction: column; de aquí */
}

/* 2. NUEVA REGLA: Solo aplicamos Flex cuando el modal tiene el atributo [open] */
#book-detail-modal[open] {
    display: flex;    
    flex-direction: column;
}

.detail-modal-content { 
    display: flex; 
    gap: 2rem; 
    height: 100%; 
    overflow: hidden; /* Evita scrolls dobles */
    background-color: var(--card-bg-color);
}

.detail-cover-container { 
    position: relative; 
    cursor: pointer; 
    width: 40%; 
    max-width: 300px; 
    aspect-ratio: 2 / 3; 
    flex-shrink: 0; 
    align-self: flex-start; 
    margin: 2rem; 
    margin-right: 0; 
}

.detail-cover { 
    width: 100%; 
    height: 100%; 
    object-fit: cover; 
    border-radius: 8px; 
    box-shadow: 0 5px 15px rgba(0,0,0,0.3); 
}

.edit-cover-overlay { position: absolute; bottom: 10px; right: 10px; background-color: rgba(0, 0, 0, 0.6); color: white; width: 40px; height: 40px; border-radius: 50%; display: flex; justify-content: center; align-items: center; font-size: 20px; opacity: 0; transition: opacity var(--transition-speed) ease; }
.detail-cover-container:hover .edit-cover-overlay { opacity: 1; }

.detail-info { 
    padding: 2rem; 
    padding-left: 0; 
    width: 60%; 
    display: flex; 
    flex-direction: column; 
    overflow-y: auto; /* Scroll solo para el texto */
}

#detail-title { font-family: var(--font-title); margin: 0 0 0.25rem; border: none; padding: 0; font-size: 2rem; line-height: 1.2; }
.detail-author { font-size: 1.1rem; color: var(--accent-color); margin: 0 0 1.5rem; }
.detail-progress-section, .detail-notes-section { margin-bottom: 1.5rem; }
.detail-progress-section label, .detail-notes-section label { display: block; font-weight: bold; margin-bottom: 0.5rem; }
#detail-notes { width: 100%; padding: 0.75rem; border-radius: 5px; border: 2px solid var(--border-color); background: var(--bg-color); color: var(--text-color); font-family: var(--font-body); resize: vertical; }

.detail-page-actions { margin-top: auto; padding-top: 1rem; border-top: 1px solid var(--border-color); }
.detail-page-actions label { display: block; font-weight: bold; margin-bottom: 0.5rem; }
#move-book-select { width: 100%; padding: 0.75rem; border-radius: 5px; border: 2px solid var(--border-color); background: var(--bg-color); color: var(--text-color); }

.progress-inputs { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.5rem; }
#current-page { width: 80px; padding: 0.5rem; text-align: center; border-radius: 5px; border: 2px solid var(--border-color); background: var(--bg-color); color: var(--text-color); font-size: 1rem; }
#total-pages-display { font-size: 1rem; color: var(--accent-color); }
.progress-bar-container { width: 100%; height: 12px; background-color: var(--border-color); border-radius: 6px; overflow: hidden; margin-bottom: 0.25rem; }
#progress-bar-fill { height: 100%; width: 0%; background-color: var(--accent-color-interactive); border-radius: 6px; transition: width 0.3s ease; }
#progress-percentage { display: block; text-align: right; font-size: 0.9rem; color: var(--accent-color); }

/* ======== LOGIN & REGISTRO ======== */
.login-page { display: flex; justify-content: center; align-items: center; height: 100vh; }
.login-container { width: 100%; max-width: 400px; padding: 1rem; background-color: var(--card-bg-color); border-radius: 8px; box-shadow: var(--shadow-color); }
.login-container h1 { text-align: center; margin-bottom: 1.5rem; font-family: var(--font-title); }

#login-form, #register-form { display: flex; flex-direction: column; gap: 1rem; }
#login-form button, #register-form button { margin-top: 1rem; padding: 0.75rem; font-weight: bold; border: none; border-radius: 5px; cursor: pointer; }
.error-message { color: #E53E3E; text-align: center; margin-top: 1rem; min-height: 1.2em; }

.btn-google { display: flex; align-items: center; justify-content: center; gap: 0.75rem; width: 100%; padding: 0.75rem; margin-top: 0.75rem; border-radius: 5px; border: 1px solid var(--border-color); background-color: var(--card-bg-color); color: var(--text-color); font-weight: bold; cursor: pointer; transition: background-color 0.3s; }
.btn-google:hover { background-color: var(--bg-color); }
.btn-google img { width: 18px; height: 18px; }

.form-switcher { text-align: center; margin-top: 1.5rem; }
.form-switcher a { color: var(--accent-color); text-decoration: none; }
.form-switcher a:hover { text-decoration: underline; }

/* Password Toggle con Grid */
.password-wrapper { display: grid; grid-template-columns: 1fr auto; align-items: center; position: relative; }
.password-wrapper input[type="password"], .password-wrapper input[type="text"] { grid-column: 1 / -1; grid-row: 1; padding-right: 3rem; width: 100%; }
.toggle-password { grid-column: 2; grid-row: 1; position: relative; right: 0.75rem; z-index: 2; background: none; border: none; font-size: 1.2rem; cursor: pointer; color: var(--accent-color); padding: 0.25rem; line-height: 0; }
.toggle-password:hover, .toggle-password:focus { color: var(--accent-color-interactive); outline: none; }

/* ======== DESPLEGABLE DATOS MANUALES ======== */
details#manual-data-details { background-color: var(--bg-color); border: 1px solid var(--border-color); border-radius: 5px; margin-bottom: 1rem; overflow: hidden; }
details#manual-data-details summary { padding: 0.75rem; cursor: pointer; font-weight: bold; background-color: var(--card-bg-color); list-style: none; display: flex; align-items: center; justify-content: space-between; transition: background-color 0.2s; }
details#manual-data-details summary::after { content: '▼'; font-size: 0.8rem; transition: transform 0.3s; }
details#manual-data-details[open] summary::after { transform: rotate(180deg); }
details#manual-data-details summary:hover { background-color: var(--border-color); }

.manual-inputs-container { padding: 1rem; display: flex; flex-direction: column; gap: 1rem; border-top: 1px solid var(--border-color); }
.separator { border: 0; border-top: 1px solid var(--border-color); margin: 1rem 0; }
.google-attribution { display: flex; justify-content: flex-end; margin-top: 5px; }
.google-attribution img { width: 60px; height: auto; opacity: 0.8; }

/* ======== RESULTADOS DE BÚSQUEDA (GOOGLE BOOKS) ======== */
/* 1. Estilos base (sin bordes ni fondo) */
.book-search-results {
    max-height: 200px;
    overflow-y: auto;
    transition: all 0.2s ease;
}

/* 2. Solo aplicamos estilo visual si NO está vacío */
.book-search-results:not(:empty) {
    margin-top: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 0.5rem;
    background-color: var(--bg-color);
}.result-item { display: flex; align-items: center; gap: 0.75rem; padding: 0.5rem; cursor: pointer; border-radius: 3px; transition: background-color 0.2s; border-bottom: 1px solid var(--border-color); }
.result-item:last-child { border-bottom: none; }
.result-item:hover { background-color: var(--card-bg-color); }
.result-item img { width: 40px; height: 60px; object-fit: cover; flex-shrink: 0; border-radius: 2px; background-color: var(--border-color); }
.result-item div { display: flex; flex-direction: column; justify-content: center; }
.result-item h4 { margin: 0 0 0.2rem 0; font-size: 0.95rem; color: var(--text-color); }
.result-item p { margin: 0; font-size: 0.85rem; color: var(--accent-color); }

/* ======== BANNER COOKIES ======== */
.cookie-banner { position: fixed; bottom: 0; left: 0; width: 100%; background-color: var(--card-bg-color); box-shadow: 0 -2px 10px var(--shadow-color); padding: 1.5rem; display: flex; justify-content: center; align-items: center; gap: 1.5rem; z-index: 2000; transition: transform 0.5s ease-in-out; }
.cookie-banner.hidden { transform: translateY(100%); }
.cookie-banner p { margin: 0; font-size: 0.9rem; color: var(--text-color); text-align: center; }
.cookie-banner button { flex-shrink: 0; }

/* ======== MEDIA QUERIES ======== */
@media (max-width: 768px) {
    .site-header { padding: 1rem; } 
    .header-main { flex-direction: column; align-items: flex-start; gap: 1rem; }
    .header-controls { width: 100%; justify-content: space-between; }
    main { padding: 1rem; }
    .books-container { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }

    /* Modal Detalle en Móvil */
    #book-detail-modal { width: 95%; height: 90vh; }
    .detail-modal-content { flex-direction: column; overflow-y: auto; } /* Solo aquí scroll general */
    .detail-cover-container { width: 150px; margin: 1.5rem auto 0 auto; align-self: center; }
    .detail-info { width: 100%; padding: 1.5rem; overflow-y: visible; } /* Quitamos scroll interno en móvil */
    #detail-title { font-size: 1.5rem; }

    .cookie-banner { flex-direction: column; padding: 1rem; gap: 1rem; }
}


/* Enlace de "Olvidé mi contraseña" */
.forgot-password-container {
    text-align: right; /* Lo alineamos a la derecha */
    margin-top: -0.5rem; /* Lo pegamos un poco al campo de contraseña */
    margin-bottom: 0.5rem;
}

#forgot-password-link {
    font-size: 0.85rem;
    color: var(--accent-color);
    text-decoration: none;
}

#forgot-password-link:hover {
    text-decoration: underline;
    color: var(--accent-color-interactive);
}

/* ======== SIDEBAR DE AMIGOS ======== */

/* El fondo oscuro */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1999; /* Justo debajo del sidebar */
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* La barra lateral */
.friends-sidebar {
    position: fixed;
    top: 0;
    right: -350px; /* Oculto a la derecha */
    width: 320px;  /* Ancho fijo */
    height: 100vh; /* Altura completa */
    background-color: var(--card-bg-color);
    box-shadow: -2px 0 10px var(--shadow-color);
    z-index: 2000; /* Por encima de todo */
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--border-color);
}

.friends-sidebar.open {
    right: 0; /* Se muestra */
}

/* Cabecera del Sidebar */
.sidebar-header {
    padding: 1.5rem;
    background-color: var(--accent-color);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-profile-summary {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: bold;
    font-size: 1.1rem;
}

.user-avatar-placeholder {
    background: rgba(255,255,255,0.2);
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn-icon {
    background: none;
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.2rem;
}

/* Contenido del Sidebar */
.sidebar-content {
    padding: 1rem;
    overflow-y: auto;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.sidebar-section h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-body); /* Usamos fuente normal, no la de títulos */
    border: none; /* Quitamos borde por defecto de h2/h3 */
}

.sidebar-divider {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 0.5rem 0;
}

/* Buscador pequeño */
.search-box-sidebar {
    display: flex;
    gap: 5px;
}

.search-box-sidebar input {
    padding: 0.4rem;
    font-size: 0.9rem;
}

.search-box-sidebar button {
    padding: 0.4rem 0.8rem;
    background-color: var(--accent-color-interactive);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

/* Listas de usuarios */
.sidebar-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-height: 20px;
}

.empty-msg {
    font-size: 0.8rem;
    color: #888;
    font-style: italic;
    text-align: center;
}

.badge {
    background-color: var(--accent-color-interactive);
    color: white;
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 0.7rem;
}

/* Adaptación móvil */
@media (max-width: 480px) {
    .friends-sidebar {
        width: 85%; /* Ocupa casi todo el ancho en móvil */
        right: -100%;
    }
}

/* Botón de volver arriba a la derecha */
.back-to-demo {
    position: fixed;
    top: 20px;
    right: 20px;
    font-size: 0.8rem; /* Más chico */
    text-decoration: none;
    color: #666;
    background-color: rgba(0, 0, 0, 0.05); /* Un fondo muy suave */
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid #ddd;
    transition: all 0.3s ease;
    z-index: 1000; /* Para que siempre esté por encima */
}

.back-to-demo:hover {
    background-color: #eee;
    color: #333;
    border-color: #bbb;
}