:root {
    --bg-color: #0b0d14;
    --card-bg: #141824;
    --sidebar-bg: #0f121d;
    --text-color: #f1f5f9;
    --accent-color: #ff4f81;
    --accent-hover: #e91e63;
    --border-color: #232a3e;
    --badge-bg: rgba(255, 79, 129, 0.15);
    --font-size: 19px;
}

[data-theme="light"] {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --sidebar-bg: #f1f5f9;
    --text-color: #0f172a;
    --accent-color: #e91e63;
    --accent-hover: #be123c;
    --border-color: #cbd5e1;
    --badge-bg: rgba(233, 30, 99, 0.1);
}

[data-theme="sepia"] {
    --bg-color: #f4ebd9;
    --card-bg: #fbf0d9;
    --sidebar-bg: #eee4d0;
    --text-color: #433422;
    --accent-color: #e91e63;
    --accent-hover: #c2185b;
    --border-color: #e4d5bc;
    --badge-bg: rgba(233, 30, 99, 0.12);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.25s, color 0.25s, border-color 0.25s;
}

body {
    font-family: 'Georgia', serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 10px;
}

.progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background-color: rgba(0,0,0,0.3);
    z-index: 1000;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), #a855f7);
    width: 5%;
    transition: width 0.3s ease-out;
}

.app-layout {
    display: flex;
    max-width: 1100px;
    width: 100%;
    gap: 20px;
    position: relative;
}

.sidebar {
    position: fixed;
    top: 0;
    left: -320px;
    width: 300px;
    height: 100vh;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    z-index: 999;
    padding: 20px;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    transition: left 0.3s ease;
    box-shadow: 5px 0 25px rgba(0,0,0,0.4);
}

.sidebar.open {
    left: 0;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-credits {
    margin-top: auto;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    font-family: sans-serif;
    font-size: 13px;
    line-height: 1.6;
    opacity: 0.9;
}

.chapter-list {
    list-style: none;
    flex: 1;
    overflow-y: auto;
}

.chapter-list li {
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-family: sans-serif;
    margin-bottom: 5px;
    border: 1px solid transparent;
}

.chapter-list li:hover {
    background-color: var(--badge-bg);
    border-color: var(--border-color);
}

.chapter-list li.active {
    background-color: var(--accent-color);
    color: #ffffff;
    font-weight: bold;
}

.reader-card {
    background-color: var(--card-bg);
    flex: 1;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    gap: 24px;
    border: 1px solid var(--border-color);
}

header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    font-family: sans-serif;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.badge {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--accent-color);
    background-color: var(--badge-bg);
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 700;
}

.read-time {
    font-size: 13px;
    opacity: 0.8;
}

h1 {
    font-size: 2.2rem;
    margin-bottom: 4px;
    line-height: 1.2;
}

.sub-title {
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--accent-color);
    margin-bottom: 12px;
}

.credits-bar {
    display: flex;
    gap: 10px;
    align-items: center;
    font-size: 13px;
    margin-bottom: 16px;
    opacity: 0.85;
    background-color: var(--badge-bg);
    padding: 8px 14px;
    border-radius: 8px;
    width: fit-content;
    flex-wrap: wrap;
}

.controls-top {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.font-controls {
    margin-left: auto;
    display: flex;
    gap: 5px;
}

.btn-icon, .btn-small {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    font-family: sans-serif;
}

.btn-highlight {
    background-color: var(--badge-bg);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.btn-icon:hover, .btn-small:hover {
    border-color: var(--accent-color);
}

.content {
    font-size: var(--font-size);
    line-height: 1.9;
    min-height: 400px;
}

.content p {
    margin-bottom: 1.6rem;
    text-align: justify;
    text-indent: 1.5em;
}

.content strong {
    color: var(--accent-color);
}

footer {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    font-family: sans-serif;
}

.nav-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-num {
    font-size: 14px;
    opacity: 0.8;
}

.btn {
    padding: 12px 26px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-color);
    cursor: pointer;
    font-weight: 700;
    font-size: 14px;
    font-family: sans-serif;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #ffffff;
    border: none;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

/* --- Toast de confirmación --- */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background-color: var(--accent-color);
    color: #fff;
    padding: 12px 20px;
    border-radius: 10px;
    font-family: sans-serif;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(0,0,0,0.35);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    z-index: 2000;
    max-width: 90%;
    text-align: center;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* --- Contador de notas --- */
.notes-count {
    background-color: var(--accent-color);
    color: #fff;
    border-radius: 999px;
    font-size: 11px;
    padding: 1px 6px;
    margin-left: 4px;
}

/* --- Barra flotante al seleccionar texto --- */
.selection-toolbar {
    position: fixed;
    display: none;
    z-index: 1500;
    background-color: var(--accent-color);
    padding: 4px;
    border-radius: 8px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.35);
}

.selection-toolbar button {
    background: transparent;
    border: none;
    color: #fff;
    font-family: sans-serif;
    font-weight: 600;
    font-size: 13px;
    padding: 8px 12px;
    cursor: pointer;
    white-space: nowrap;
}

mark.user-highlight {
    background-color: rgba(139, 92, 246, 0.35);
    color: inherit;
    border-radius: 3px;
    padding: 0 2px;
    cursor: pointer;
}

/* --- Modales (Buscador y Notas) --- */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0,0,0,0.6);
    z-index: 3000;
    align-items: flex-start;
    justify-content: center;
    padding: 60px 16px;
    overflow-y: auto;
}

.modal-overlay.open {
    display: flex;
}

.modal-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    width: 100%;
    max-width: 560px;
    padding: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    font-family: sans-serif;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.1rem;
}

.search-input {
    width: 100%;
    padding: 12px 14px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 15px;
    margin-bottom: 14px;
    font-family: sans-serif;
}

.search-results, .notes-list {
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.search-result-item, .note-item {
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    background-color: var(--bg-color);
}

.search-result-item:hover {
    border-color: var(--accent-color);
}

.search-result-item .chapter-label, .note-item .chapter-label {
    font-size: 12px;
    color: var(--accent-color);
    font-weight: 700;
    text-transform: uppercase;
    display: block;
    margin-bottom: 4px;
}

.search-result-item .snippet {
    font-size: 13px;
    opacity: 0.9;
    line-height: 1.5;
}

.search-result-item .snippet mark {
    background-color: var(--accent-color);
    color: #fff;
    border-radius: 3px;
    padding: 0 2px;
}

.note-item {
    cursor: default;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
}

.note-item .note-text {
    font-size: 14px;
    line-height: 1.5;
    font-style: italic;
}

.note-item .note-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.note-item .note-actions button {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    padding: 4px 8px;
    font-size: 12px;
}

.empty-state {
    text-align: center;
    opacity: 0.7;
    font-size: 14px;
    padding: 30px 10px;
}

.modal-box-small {
    max-width: 400px;
}

.glosario-texto {
    font-size: 15px;
    line-height: 1.7;
    text-align: left;
}

.content .term {
    color: var(--accent-color);
    border-bottom: 2px dotted var(--accent-color);
    cursor: pointer;
    font-weight: 600;
}

.content .term:hover {
    background-color: var(--badge-bg);
}

@media (max-width: 768px) {
    .reader-card {
        padding: 20px;
    }
    h1 {
        font-size: 1.7rem;
    }
    .sub-title {
        font-size: 1.1rem;
    }
    .font-controls {
        margin-left: 0;
    }
}