:root {
    --bg-main: #ffffff;
    --bg-dark: #000000;
    --text-main: #111111;
    --text-light: #ffffff;
    --text-muted: #777777;
    --progress-fill: #ffffff;
     
    /* Variables dinámicas para las preferencias de lectura */
    --reader-font-family: 'Roboto', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --reader-font-size: 1.1rem;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    -webkit-font-smoothing: antialiased;
    /* REGLAS CRÍTICAS PARA EVITAR BLOQUEOS POR PULSACIÓN LARGA EN APK */
    -webkit-touch-callout: none; /* Desactiva el menú contextual emergente nativo en iOS/Android webviews */
    -webkit-user-select: none;   /* Desactiva la selección de texto en renderizadores WebKit */
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;           /* Desactiva la selección de texto global */
}

/* CAPA DE INTRODUCCIÓN Y DISCLAIMER BRUTALISTA */
#introOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-dark);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 32px;
    box-sizing: border-box;
    transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

#introTitle {
    color: var(--text-light);
    font-size: 2rem;
    font-weight: 100;
    letter-spacing: 12px;
    text-transform: uppercase;
    text-align: center;
    opacity: 0;
    display: block;
}

#introTitle.animate-text {
    animation: letrasIntro 5.5s cubic-bezier(0.25, 1, 0.5, 1) forwards;
}

#introDisclaimer {
    color: var(--text-light);
    font-size: 0.85rem;
    font-weight: 100;
    letter-spacing: 2px;
    line-height: 1.8;
    text-transform: uppercase;
    text-align: center;
    max-width: 600px;
    display: none;
    opacity: 0;
}

#introDisclaimer.animate-disclaimer {
    animation: disclaimerIntro 5s cubic-bezier(0.25, 1, 0.5, 1) forwards;
}

/* ANIMACIÓN FLASH DESTELLO BLANCO */
#introOverlay.flash-effect {
    animation: flashAnimation 0.4s cubic-bezier(0.25, 1, 0.5, 1) forwards;
}

/* KEYFRAMES */
@keyframes letrasIntro {
    0% {
        opacity: 0;
        letter-spacing: 24px;
        transform: scale(0.95);
    }
    40% {
        opacity: 1;
    }
    100% {
        opacity: 1;
        letter-spacing: 8px;
        transform: scale(1);
    }
}

@keyframes flashAnimation {
    0% {
        background-color: var(--bg-dark);
    }
    50% {
        background-color: #ffffff;
    }
    100% {
        background-color: var(--bg-dark);
    }
}

@keyframes disclaimerIntro {
    0% {
        opacity: 0;
        transform: translateY(4px);
    }
    20% {
        opacity: 1;
        transform: translateY(0);
    }
    80% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(-4px);
    }
}

/* CABECERA NEGRA MINIMALISTA */
header {
    position: fixed;
    left: 0;
    top: 0;
    height: 60px;
    width: 100%;
    background-color: var(--bg-dark);
    color: var(--text-light);
    padding: 10px;
    display: table;
    z-index: 100;
}

#headerTitle {
    font-size: 1.1rem;
    font-weight: 100;
    letter-spacing: 1px;
    margin: 0;
    text-transform: uppercase;
}

.header-left {
    display: table-cell;
    width: 50%;
    vertical-align: middle;
}

.header-right {
    display: table-cell;
    vertical-align: middle;
    text-align: right;
    z-index: 10;
}

h1 {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin: 0;
    text-transform: uppercase;
}

h1 span {
    color: var(--text-muted);
    font-size: 0.75rem;
    display: block;
    font-weight: 400;
    letter-spacing: 0;
    text-transform: none;
    margin-top: 2px;
}

/* CONTENEDOR DEL BUSCADOR INTEGRADO (BAJO EL HEADER) */
#searchContainer {
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    height: 45px;
    background-color: var(--bg-dark);
    z-index: 90;
    padding: 0 8px 8px 8px;
}

#inputBuscar {
    width: 100%;
    height: 100%;
    background-color: #111111;
    border: 1px solid #333333;
    color: var(--text-light);
    font-family: 'Roboto', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 0 12px;
    outline: none;
    text-transform: uppercase;
}

#inputBuscar::placeholder {
    color: #555555;
}

/* BOTONES SIN BORDES NI CONTENEDORES */
.btn {
    background-color: transparent;
    color: var(--text-light);
    border: none;
    z-index: 10;
    padding: 8px 0;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
}

.btn.secondary {
    color: var(--text-light);
}

#btnBuscarToggle {
    color: #ffffff !important;
    opacity: 1 !important;
    -webkit-text-fill-color: #ffffff !important;
    filter: none !important;
}

.file-input-wrapper {
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.file-input-wrapper input[type=file] {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    cursor: pointer;
    height: 100%;
    width: 100%;
}

/* VISTA GALERÍA */
.grid-view {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px 8px 80px 8px;
    box-sizing: border-box;
}

.book-card {
    display: flex;
    flex-direction: column;
    position: relative;
    background-color: transparent;
    border: none;
    padding: 4px 0;
    width: calc((100% - (8px * 2)) / 3);
    cursor: pointer;
    box-sizing: border-box;
}

.book-cover-container {
    position: relative;
    width: 100%;
    aspect-ratio: 2 / 3;
    margin-bottom: 6px;
}

.book-cover-thumbnail {
    width: 100%;
    height: 100%;
    border-radius: 0;
    object-fit: cover;
    background-color: #f0f0f0;
}

.fav-star-btn {
    position: absolute;
    top: 6px;
    right: 6px;
    background: transparent;
    border: none;
    color: #888888;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 12;
    padding: 0;
    line-height: 1;
    text-shadow: 0px 0px 2px rgba(0,0,0,0.5);
    user-select: none;
}

.fav-star-btn.is-active {
    color: #ffffff;
}

.check-100 {
    position: absolute;
    bottom: 6px;
    left: 6px;
    color: #00cc66;
    font-size: 1.2rem;
    font-weight: bold;
    z-index: 12;
    line-height: 1;
    text-shadow: 0px 0px 2px rgba(0,0,0,0.6);
    user-select: none;
}

.game-badge {
    position: absolute;
    top: 6px;
    left: 6px;
    font-size: 1.2rem;
    z-index: 12;
    line-height: 1;
    text-shadow: 0px 0px 2px rgba(0,0,0,0.6);
    user-select: none;
}

.card-title {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 0 0 2px 0;
    line-height: 1.2;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    word-break: break-word;
}

.card-authors {
    font-size: 0.55rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 8px;
    text-transform: uppercase;
    word-break: break-word;
}

.card-progress-container {
    margin-top: auto;
    width: 100%;
}

.progress-text {
    font-size: 0.5rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: 2px;
    display: block;
}

.progress-bar-bg {
    background-color: #e5e5e5;
    height: 2px;
    width: 100%;
}

.progress-bar-fill {
    background-color: var(--text-main);
    height: 100%;
    width: 0%;
}

/* VISTA LECTOR */
.reader-view {
    width: 100%;
    display: none;
    position: relative;
}

.reader-nav {
    display: table;
    width: 100%;
    position: fixed;
    bottom: 0;
    left: 0;
    background-color: var(--bg-dark);
    padding: 16px;
    z-index: 15;
}

.nav-cell {
    display: table-cell;
    vertical-align: middle;
}

.reader-content {
    background-color: var(--bg-main);
    padding: 40px 24px 140px 24px;
    line-height: 1.75;
    font-family: var(--reader-font-family);
    font-size: var(--reader-font-size);
    letter-spacing: -0.1px;
    user-select: none;
    padding-bottom: 210px; /* Espacio para la barra de navegación inferior */
}

.reader-content h2 {
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 4px;
    color: var(--text-main);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.reader-content h3 {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--text-muted);
    margin-top: 0;
    margin-bottom: 32px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.reader-content p {
    margin-bottom: 20px;
    text-align: justify;
}

.reader-content h4 {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 24px 0 8px 0;
    color: var(--text-main);
}

.reader-content ul {
    margin: 0 0 20px 0;
    padding-left: 16px;
    list-style-type: square;
}

.reader-content li {
    font-size: 0.85rem;
    margin-bottom: 6px;
    color: var(--text-main);
}

.reader-image-container {
    width: 100%;
    margin: 24px 0;
    text-align: center;
}

.reader-inline-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    display: block;
}

.empty-state {
    text-align: left;
    padding: 32px 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    width: 100%;
}

.edge-nav {
    position: fixed;
    top: 0;
    bottom: 80px;
    width: 15%;
    z-index: 5;
    cursor: pointer;
    background: transparent;
}

#edgePrev {
    left: 0;
}

#edgeNext {
    right: 0;
}

/* BARRA DE NAVEGACIÓN INFERIOR GLOBAL */
.global-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background-color: var(--bg-dark);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 20;
}

.nav-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px 0;
    flex: 1;
    text-align: center;
    user-select: none;
}

.nav-tab.is-active {
    color: var(--text-light);
}

.nav-icon {
    font-size: 1.1rem;
    margin-bottom: 2px;
}

.nav-label {
    font-size: 0.55rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* SECCIÓN PREFERENCIAS / USUARIO */
.preferences-view {
    width: 100%;
    padding: 24px 16px 100px 16px;
    box-sizing: border-box;
    background-color: var(--bg-main);
}

.preferences-content h2 {
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 0;
    margin-bottom: 24px;
}

.pref-group {
    margin-bottom: 24px;
}

.pref-group label {
    display: block;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.pref-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.pref-btn {
    color: var(--text-main) !important;
    font-size: 0.75rem !important;
    padding: 4px 0 !important;
    text-decoration: none;
}

.pref-btn:hover, .pref-btn:focus {
    color: var(--text-muted) !important;
}

/* LISTAS ADICIONALES DE LA VISTA USUARIO Y TIENDA */
.lista-usuario-brutalista {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-top: 4px;
}

.item-lista-usuario {
    padding: 10px 0;
    border-bottom: 1px solid #1a1a1a;
}

.link-libro-usuario {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    text-decoration: none;
}

.link-libro-usuario:active {
    color: rgb(131, 0, 0);
}

.empty-state-lista {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    padding: 8px 0;
}

#indexModal {
    position: fixed;
    bottom: 58px;
    left: 0;
    width: 100%;
    background-color: var(--bg-dark);
    color: var(--text-light);
    z-index: 100;
    padding: 20px;
    box-sizing: border-box;
}

#indexModalContent::-webkit-scrollbar {
    display: none;
}

#desleerModal, #tiendaModal {
    position: fixed;
    bottom: 58px;
    left: 0;
    width: 100%;
    background-color: var(--bg-dark);
    color: var(--text-light);
    z-index: 110;
    padding: 24px;
    box-sizing: border-box;
}

.gamebook-choice-btn {
    width: 100%;
    background-color: transparent;
    color: var(--text-light);
    border: 1px solid #333333;
    padding: 12px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: left;
    cursor: pointer;
    transition: background-color 0.2s;
}

.gamebook-choice-btn:active {
    background-color: #222222;
}

.lang-select {
    background-color: transparent;
    color: var(--text-light);
    border: 1px solid #333333;
    padding: 4px 8px;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: 'Roboto', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    outline: none;
    cursor: pointer;
    margin-right: 8px;
    vertical-align: middle;
}

.lang-select option {
    background-color: var(--bg-dark);
    color: var(--text-light);
}

/* COMPONENTES DE LA TIENDA */
.tienda-filter-bar {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    width: 100%;
    padding: 4px 0 16px 0;
    margin-bottom: 16px;
    border-bottom: 1px dashed #333333;
}

.tienda-filter-bar::-webkit-scrollbar {
    display: none;
}

.tienda-chip {
    background: transparent;
    border: 1px solid #333333;
    color: var(--text-main);
    padding: 6px 12px;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    white-space: nowrap;
}

.tienda-chip.is-active {
    background: var(--bg-dark);
    color: var(--text-light);
    border-color: var(--bg-dark);
}

.tienda-badge {
    background: #111111;
    color: #ffffff;
    font-size: 0.55rem;
    font-weight: 700;
    padding: 2px 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-block;
    margin-bottom: 4px;
}

/* ETIQUETA TEXTUAL PARA IDENTIFICAR LIBROJUEGOS EN LAS TARJETAS */
.gamebook-card-badge {
    background-color: rgb(131, 0, 0);
    color: #ffffff;
    font-size: 0.5rem;
    font-weight: 700;
    padding: 2px 4px;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    align-self: flex-start;
}