/* public/css/lector.css */
:root {
    --reader-bg: #e2e8f0;
    /* Fondo del escritorio */
    --reader-sidebar-bg: #ffffff;
    --reader-text: #1e293b;
    --reader-text-muted: #64748b;
    --reader-border: #cbd5e1;
    --reader-primary: #553ED6;
    --reader-primary-light: #ece9fb;
    --reader-hover: #f8fafc;

    /* Book colors */
    --paper-bg: #fdfbf7;
    /* Color marfil antiguo */
    --paper-border: #e6e4df;

    /* Typography */
    --reader-font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --reader-font-serif: 'Merriweather', 'Georgia', serif;
}

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    /* Prevenir scroll de toda la página */
}

/* Layout Principal */
.reader-layout {
    display: flex;
    height: 100vh;
    width: 100vw;
    background-color: var(--reader-bg);
    /* Patrón sutil para el fondo del escritorio */
    background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
    background-size: 20px 20px;
    font-family: var(--reader-font-sans);
}

/* Barra Superior */
.reader-topbar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--reader-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 50;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.btn-toggle-sidebar {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--reader-text);
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.btn-toggle-sidebar:hover {
    background-color: var(--reader-hover);
}

.reader-breadcrumb {
    font-size: 0.9rem;
    color: var(--reader-text-muted);
}

.reader-breadcrumb span {
    color: var(--reader-text);
    font-weight: 500;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-icon {
    background: white;
    border: 1px solid var(--reader-border);
    color: var(--reader-text-muted);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.btn-icon:hover {
    border-color: var(--reader-primary);
    color: var(--reader-primary);
    box-shadow: 0 4px 6px rgba(85, 62, 214, 0.1);
    transform: translateY(-2px);
}

.btn-icon.tts-active {
    background: #ef4444 !important;
    color: white !important;
    border-color: #ef4444 !important;
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.4) !important;
    animation: pulse-tts 2s infinite;
}

.btn-icon.tts-paused {
    background: #f59e0b !important;
    color: white !important;
    border-color: #f59e0b !important;
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.4) !important;
}

/* Sidebar (Índice) */
.reader-sidebar {
    width: 300px;
    flex-shrink: 0;
    background-color: var(--reader-sidebar-bg);
    border-right: 1px solid var(--reader-border);
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 40;
    position: relative;
    height: calc(100vh - 60px);
    margin-top: 60px;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.05);
}

.reader-sidebar.collapsed {
    margin-left: -300px;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--reader-border);
}

.sidebar-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--reader-text);
    margin: 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.toc-container {
    flex: 1;
    overflow-y: auto;
    padding: 15px 0;
}

.toc-chapter-title {
    padding: 10px 20px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--reader-text);
    background-color: #f8fafc;
}

.toc-section-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-section-link {
    display: flex;
    padding: 10px 20px 10px 30px;
    color: var(--reader-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s;
    border-left: 3px solid transparent;
    cursor: pointer;
}

.toc-section-link:hover {
    background-color: var(--reader-hover);
    color: var(--reader-primary);
}

.toc-section-link.active {
    background-color: var(--reader-primary-light);
    color: var(--reader-primary);
    border-left-color: var(--reader-primary);
    font-weight: 500;
}

/* Main Workspace (Donde vive el libro) */
.reader-workspace {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 60px;
    /* Offset for topbar */
    position: relative;
    /* Necesario para el overlay de portada */
    overflow: hidden;
}

/* --- ESTILOS DEL LIBRO 3D (stPageFlip) --- */

.book-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: calc(100vh - 60px);
    /* Ocupa el alto del workspace */
    overflow: hidden;
    /* Oculta lo que sobresalga durante la animación */
    transition: opacity 0.5s ease;
}

.book-scaler {
    position: relative;
    /* Necesario para que las flechas se posicionen dentro */
    transform-origin: center center;
    transition: transform 0.2s ease;
}

/* El elemento principal del libro */
#flipbook {
    background-color: var(--paper-bg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15), 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* Páginas físicas */
.page {
    background-color: var(--paper-bg);
    /* Textura sutil de papel */
    background-image:
        linear-gradient(90deg, transparent 95%, rgba(0, 0, 0, 0.02) 100%),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.05'/%3E%3C/svg%3E");
    border: 1px solid var(--paper-border);
    overflow: hidden;
}

/* Sombra en el centro (lomo) para páginas derechas */
.page.--right {
    box-shadow: inset 10px 0 20px rgba(0, 0, 0, 0.05);
    border-left: 1px solid rgba(0, 0, 0, 0.1);
}

/* Sombra en el centro (lomo) para páginas izquierdas */
.page.--left {
    box-shadow: inset -10px 0 20px rgba(0, 0, 0, 0.05);
    border-right: 1px solid rgba(0, 0, 0, 0.1);
}

/* Contenido interno de la página */
.page-content {
    padding: 40px 50px;
    height: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

/* Cabecera de la página (Contexto) */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--reader-font-sans);
    font-size: 0.85rem;
    color: var(--reader-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid rgba(0, 0, 0, 0.05);
    padding-bottom: 12px;
    margin-bottom: 25px;
}

.page-header .book-name {
    font-weight: 600;
    color: var(--reader-text-muted);
}

.page-header .chapter-name {
    font-weight: 500;
}

/* Estilos tipográficos dentro del libro */
.page-text {
    font-family: var(--reader-font-serif);
    font-size: 0.95rem;
    line-height: 1.7;
    color: #2c3e50;
    flex: 1;
    overflow-y: auto;
    /* Por si el contenido excede un poco la página */
    padding-right: 10px;
    /* Espacio para el scroll si aparece */
    cursor: text;
    user-select: text;
    -webkit-user-select: text;
}

/* Ocultar barra de scroll interna para mantener la ilusión, pero permitir scroll */
.page-text::-webkit-scrollbar {
    width: 4px;
}

.page-text::-webkit-scrollbar-track {
    background: transparent;
}

.page-text::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
}

.page-text h1 {
    font-family: var(--reader-font-sans);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--reader-text);
    margin-top: 0;
    margin-bottom: 1.2rem;
    border-bottom: 1px solid var(--reader-primary-light);
    padding-bottom: 8px;
}

.page-text h2 {
    font-family: var(--reader-font-sans);
    font-size: 1.3rem;
    margin-top: 1.5rem;
    color: var(--reader-text);
}

.page-text p {
    margin-bottom: 1.2rem;
    text-align: justify;
    /* Justificado típico de libros */
}

/* --- ESTILOS DE INTRODUCCIÓN Y SÍNTESIS --- */
.chapter-intro-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
    padding: 0 10px;
}

.chapter-intro-content > *:first-child {
    margin-top: auto;
}

.chapter-intro-content > *:last-child {
    margin-bottom: auto;
}

.intro-chapter-num {
    font-size: 0.9rem;
    letter-spacing: 3px;
    color: var(--reader-primary);
    font-weight: 700;
    margin-bottom: 5px;
    opacity: 0.8;
}

.intro-chapter-title {
    font-size: 2.2rem !important;
    font-family: var(--reader-font-sans);
    line-height: 1.1;
    margin-top: 0;
    margin-bottom: 25px;
    border: none !important;
    padding: 0 !important;
}

.intro-divider {
    width: 60px;
    height: 4px;
    background: var(--reader-primary);
    margin-bottom: 30px;
    border-radius: 2px;
}

.intro-text {
    font-size: 1.05rem;
    color: var(--reader-text-muted);
    font-style: italic;
    line-height: 1.8;
}

.synthesis-content p {
    margin-bottom: 1.5rem;
    position: relative;
}

.synthesis-content p::first-letter {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--reader-primary);
}

.page-text ul {
    margin-bottom: 1.2rem;
    padding-left: 1.5rem;
}

.page-text blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.02);
    border-left: 3px solid var(--reader-primary);
    font-style: italic;
    color: var(--reader-text-muted);
}

/* Número de página en el pie */
.page-footer {
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--reader-font-sans);
    font-size: 0.8rem;
    color: #94a3b8;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    margin-top: 20px;
}

.page.--left .page-footer {
    justify-content: flex-start;
}

.page.--right .page-footer {
    justify-content: flex-end;
}

/* Portada del libro */
.page-cover {
    background-color: var(--paper-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0;
    /* Remove padding to allow image to fill */
    border: 1px solid rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.page-cover img.cover-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.page-cover.--front {
    /* Eliminamos el border-radius asimétrico para que sea igual al resto de páginas */
}

.page-cover.--back {
    /* Eliminamos box-shadow asimétrico */
}

/* Ocultamos los títulos antiguos de texto de la portada */
.cover-title,
.cover-author {
    display: none;
}

/* Navegación (Flechas) - posicionadas dentro del book-scaler, sobre bordes de las páginas */
.book-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: rgba(100, 116, 139, 0.35);
    width: 32px;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 40;
    transition: color 0.25s, background 0.25s;
}

.book-nav-btn:hover {
    color: var(--reader-primary);
    background: rgba(85, 62, 214, 0.07);
    border-radius: 4px;
}

.book-nav-btn.prev {
    left: 0;
}

.book-nav-btn.next {
    right: 0;
}

/* Overlay de portada del libro */
.book-cover-overlay {
    position: absolute;
    top: 60px;
    /* Respeta el header superior para que el centro coincida exactamente con el del libro */
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    background: var(--reader-bg);
    background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
    background-size: 20px 20px;
    z-index: 30;
    cursor: pointer;
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.6s;
}

.book-cover-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.cover-book-3d {
    border-radius: 4px 12px 12px 4px;
    box-shadow:
        4px 0 6px rgba(0, 0, 0, 0.1),
        8px 4px 20px rgba(0, 0, 0, 0.25),
        16px 8px 40px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    transform: perspective(800px) rotateY(-8deg);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.cover-book-3d:hover {
    transform: perspective(800px) rotateY(-4deg) translateX(-4px);
    box-shadow:
        8px 0 10px rgba(0, 0, 0, 0.1),
        16px 8px 30px rgba(0, 0, 0, 0.3),
        24px 12px 50px rgba(0, 0, 0, 0.2);
}

.cover-book-3d img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.cover-hint {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--reader-font-sans);
    font-size: 0.85rem;
    color: var(--reader-text-muted);
    animation: pulse-hint 2s infinite;
}

@keyframes pulse-hint {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .book-nav-btn {
        width: 24px;
        height: 90px;
    }
}

/* --- Reading Tools (Highlights & Notes) --- */

/* Highlights */
mark {
    background-color: transparent;
    color: inherit;
}

mark {
    cursor: pointer;
    border-radius: 2px;
    transition: filter 0.2s;
}

mark:hover {
    filter: brightness(0.9);
}

mark.hl-yellow {
    background-color: rgba(251, 191, 36, 0.4);
    border-bottom: 2px solid rgba(251, 191, 36, 0.6);
}

mark.hl-green {
    background-color: rgba(52, 211, 153, 0.4);
    border-bottom: 2px solid rgba(52, 211, 153, 0.6);
}

mark.hl-blue {
    background-color: rgba(96, 165, 250, 0.4);
    border-bottom: 2px solid rgba(96, 165, 250, 0.6);
}

mark.hl-pink {
    background-color: rgba(244, 114, 182, 0.4);
    border-bottom: 2px solid rgba(244, 114, 182, 0.6);
}

mark.hl-orange {
    background-color: rgba(251, 146, 60, 0.4);
    border-bottom: 2px solid rgba(251, 146, 60, 0.6);
}

/* Floating Toolbar — sutil y minimalista */
/* Scoped bajo .reader-layout para evitar conflicto de especificidad con favoritos.css */
.reader-layout .selection-toolbar {
    position: fixed;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 20px;
    padding: 5px 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1), 0 1px 4px rgba(0, 0, 0, 0.06);
    z-index: 2000;
    pointer-events: all;
    visibility: hidden;
    opacity: 0;
    transform: translateY(6px) translateX(-50%);
    transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s;
    /* Reset explícito de propiedades que favoritos.css inyecta */
    bottom: auto;
    color: inherit;
}

.reader-layout .selection-toolbar.active {
    visibility: visible;
    opacity: 1;
    transform: translateY(0) translateX(-50%);
    bottom: auto;
}

.color-dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    border: 2px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
}

.color-dot:hover {
    transform: scale(1.25);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}

.dot-yellow {
    background-color: #fbbf24;
}

.dot-green {
    background-color: #34d399;
}

.dot-blue {
    background-color: #60a5fa;
}

.dot-pink {
    background-color: #f472b6;
}

.dot-orange {
    background-color: #fb923c;
}

.toolbar-separator {
    width: 1px;
    height: 16px;
    background: rgba(0, 0, 0, 0.1);
}

.btn-note {
    background: none;
    border: none;
    color: rgba(100, 116, 139, 0.7);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    transition: color 0.2s;
}

.btn-note:hover {
    color: var(--reader-primary);
}

/* Toast Notifications */
.reader-toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #334155;
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.9rem;
    z-index: 5000;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    pointer-events: none;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.reader-toast.active {
    transform: translateX(-50%) translateY(0);
}

.reader-toast.error {
    background: #ef4444;
}

/* --- Study Sidebar (Right) --- */
.study-sidebar {
    width: 350px;
    background-color: var(--reader-sidebar-bg);
    border-left: 1px solid var(--reader-border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    /* Over topbar shadow if needed */
    position: fixed;
    right: 0;
    top: 60px;
    height: calc(100vh - 60px);
    box-shadow: -4px 0 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), margin-right 0.4s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.4s;
    transform: translateX(100%);
    visibility: hidden;
}

@media (min-width: 1025px) {
    .study-sidebar {
        position: relative;
        transform: none;
        margin-right: -350px;
        transition: margin-right 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
        box-shadow: none;
        border-left: 1px solid var(--reader-border);
        visibility: hidden;
    }

    .study-sidebar.active {
        margin-right: 0;
        visibility: visible;
    }
}

.study-sidebar.active {
    transform: translateX(0);
    visibility: visible;
}

.study-sidebar .sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.study-tabs {
    display: flex;
    padding: 12px 20px;
    gap: 8px;
    border-bottom: 1px solid var(--reader-border);
    background: #f8fafc;
}

.study-tab {
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--reader-border);
    background: white;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    color: var(--reader-text-muted);
    transition: all 0.2s;
}

.study-tab:hover {
    border-color: var(--reader-primary);
    color: var(--reader-primary);
}

.study-tab.active {
    background: var(--reader-primary);
    color: white;
    border-color: var(--reader-primary);
}

.study-items-container {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Scrollbar personalizado para el panel de estudio */
.study-items-container::-webkit-scrollbar {
    width: 6px;
}

.study-items-container::-webkit-scrollbar-track {
    background: transparent;
}

.study-items-container::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}

.study-items-container::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    text-align: center;
    color: var(--reader-text-muted);
    padding: 20px;
}

.empty-state p {
    font-size: 0.85rem;
    margin-top: 12px;
    line-height: 1.4;
}

/* Study Card Items */
.study-card {
    flex-shrink: 0;
    padding: 16px;
    border-radius: 12px;
    background: white;
    border: 1px solid var(--reader-border);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.btn-reader-action:hover {
    background: rgba(85, 62, 214, 0.1);
    color: var(--primary);
    transform: translateY(-2px);
}

.btn-reader-action.tts-active {
    background: #ef4444 !important;
    color: white !important;
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
    animation: pulse-tts 2s infinite;
}

.btn-reader-action.tts-paused {
    background: #f59e0b !important;
    color: white !important;
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.4);
}

@keyframes pulse-tts {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.study-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.study-card-type {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 8px;
    border-radius: 4px;
}

.type-marcador {
    background: var(--reader-primary-light);
    color: var(--reader-primary);
}

.type-nota {
    background: #fef3c7;
    color: #d97706;
}

.study-card-page {
    font-size: 0.7rem;
    color: var(--reader-text-muted);
    font-weight: 500;
}

.study-card-text {
    font-family: var(--reader-font-serif);
    font-size: 0.85rem;
    color: var(--reader-text);
    line-height: 1.5;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    padding-left: 10px;
    border-left: 3px solid var(--reader-primary);
}

.study-card.color-yellow {
    border-left: 4px solid #fbbf24;
}

.study-card.color-green {
    border-left: 4px solid #34d399;
}

.study-card.color-blue {
    border-left: 4px solid #60a5fa;
}

.study-card.color-pink {
    border-left: 4px solid #f472b6;
}

.study-card-content {
    font-size: 0.85rem;
    color: var(--reader-text);
    background: #f8fafc;
    padding: 10px;
    border-radius: 8px;
    margin-top: 5px;
    border: 1px dashed var(--reader-border);
}

.study-card-actions {
    margin-top: 10px;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    opacity: 0;
    transition: opacity 0.2s;
}

.study-card:hover .study-card-actions {
    opacity: 1;
}

.btn-card-action {
    background: transparent;
    border: none;
    color: var(--reader-text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.2s;
}

.btn-card-action:hover {
    background: var(--reader-hover);
    color: var(--reader-primary);
}

.btn-card-action.delete:hover {
    color: #ef4444;
    background: #fef2f2;
}

/* --- Note Modal & Popovers --- */
.note-modal {
    position: fixed;
    z-index: 3000;
    background: white;
    border-radius: 16px;
    width: 320px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
    padding: 20px;
    display: none;
    flex-direction: column;
    gap: 15px;
    border: 1px solid var(--reader-border);
    animation: scaleUp 0.2s ease-out;
    box-sizing: border-box;
    /* Asegurar que el padding no sume al ancho */
}

@keyframes scaleUp {
    from {
        transform: scale(0.9);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.note-modal textarea {
    width: 100%;
    height: 120px;
    border: 1px solid var(--reader-border);
    border-radius: 8px;
    padding: 12px;
    font-family: inherit;
    font-size: 0.95rem;
    resize: none;
    box-sizing: border-box;
    /* Clave para evitar desbordamiento */
    background: #f8fafc;
}

.note-modal textarea:focus {
    outline: none;
    border-color: var(--reader-primary);
}

.note-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.btn-save-note {
    background: var(--reader-primary);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
}

.btn-cancel-note {
    background: transparent;
    border: none;
    color: var(--reader-text-muted);
    padding: 8px;
    cursor: pointer;
}

/* Burbuja de visualización de nota */
.note-popover {
    position: fixed;
    z-index: 2500;
    background: #fff9db;
    border: 1px solid #ffec99;
    padding: 0;
    border-radius: 12px;
    max-width: 280px;
    min-width: 150px;
    font-size: 0.9rem;
    color: #856404;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    pointer-events: all;
    display: none;
    animation: fadeIn 0.2s ease;
    overflow: hidden;
}

/* Popover compacto para resaltados */
.note-popover.popover-highlight {
    background: white;
    border: 1px solid #e2e8f0;
    min-width: auto;
}

.popover-highlight .btn-popover-delete {
    color: #64748b;
}

.popover-highlight .btn-popover-delete:hover {
    background: #fef2f2;
    color: #ef4444;
}

.popover-content {
    padding: 15px;
    line-height: 1.5;
    max-height: 150px;
    overflow-y: auto;
}

.popover-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0;
    background: rgba(133, 100, 4, 0.05);
    border-top: 1px solid rgba(133, 100, 4, 0.1);
}

.btn-popover-edit, .btn-popover-delete {
    background: transparent;
    border: none;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    color: #856404;
    opacity: 0.7;
}

.btn-popover-edit:hover {
    background: rgba(85, 62, 214, 0.1);
    color: var(--reader-primary);
    opacity: 1;
}

.btn-popover-delete:hover {
    background: #fee2e2;
    color: #ef4444;
    opacity: 1;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Estilo visual para el texto con nota */
mark.type-nota {
    background-color: rgba(254, 243, 199, 0.4);
    border-bottom: 2px dashed #d97706;
    position: relative;
    cursor: help;
}

mark.type-nota::after {
    content: '📝';
    font-size: 0.65rem;
    position: absolute;
    top: -8px;
    right: -8px;
    background: white;
    border: 1px solid #d97706;
    border-radius: 4px;
    padding: 1px;
    line-height: 1;
}

/* Custom Confirm Modal */
.confirm-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
}
.confirm-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}
.confirm-modal-container {
    background: white;
    width: 90%;
    max-width: 360px;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.2);
    text-align: center;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.confirm-modal-overlay.active .confirm-modal-container {
    transform: translateY(0);
}
.confirm-modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--reader-text);
    margin-bottom: 0.5rem;
}
.confirm-modal-text {
    color: var(--reader-text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}
.confirm-modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}
.btn-confirm-cancel, .btn-confirm-delete {
    padding: 0.75rem 1.25rem;
    border-radius: 10px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}
.btn-confirm-cancel {
    background: #f1f5f9;
    color: #475569;
}
.btn-confirm-cancel:hover {
    background: #e2e8f0;
}
.btn-confirm-delete {
    background: #ef4444;
    color: white;
}
.btn-confirm-delete:hover {
    background: #dc2626;
}