:root {
    /* Paleta Editorial Vintage */
    --bg-main: #f3eee7;           /* Papel cálido */
    --bg-card: #fcf9f5;           /* Crema claro */
    --text-main: #24211e;         /* Tinta oscura */
    --text-muted: #6a645d;       /* Tinta tenue */
    --border-color: #d8d0c5;     /* Borde vintage */
    
    --accent-red: #a83228;       /* Terracota */
    --accent-gold: #c98832;      /* Oro viejo */
    --accent-blue: #32586b;      /* Azul río */

    --font-serif: 'Cormorant Garamond', Georgia, serif;
    --font-mono: 'Space Mono', monospace;

    --transition-smooth: all 0.25s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-serif);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    /* Textura suave de papel granulado mediante CSS */
    background-image: 
        radial-gradient(rgba(0,0,0,0.03) 1px, transparent 0),
        radial-gradient(rgba(0,0,0,0.02) 1px, transparent 0);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
}

.sys-meta, .sys-tag, .sys-status, .sys-distance, .label, .explanation-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: flex;
    flex-direction: column;
}

/* PORTADA MINIMALISTA Y ELEGANTE */
#screen-intro {
    justify-content: center;
    align-items: center;
    padding: 3rem 2rem;
    position: relative;
    background-color: var(--bg-main); /* Mismo fondo papel cálido que el resto */
}

/* Ocultamos capas oscuras y overlays */
.intro-overlay {
    display: none;
}

.intro-container {
    max-width: 650px;
    width: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 2;
}

.sys-meta {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-muted);
}

.main-title {
    font-family: var(--font-serif);
    font-size: 3.2rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    line-height: 1.1;
    color: var(--text-main);
    margin: 0.6rem 0 0.2rem;
    text-shadow: none; /* Eliminamos sombras toscas */
}

.subtitle {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    text-shadow: none;
}

.intro-visual-zone {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
    width: 100%;
}

.intro-col {
    display: flex;
    flex-direction: column;
}

.intro-1914 .year-label, .intro-1969 .year-label {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--text-main);
    text-shadow: none;
}

.loc-label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
}

.intro-frontier {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
}

.bench-icon {
    width: 38px;
    height: 20px;
    color: var(--text-main);
}

.frontier-text {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--accent-red);
    letter-spacing: 0.15em;
    font-weight: 700;
}

.intro-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.2rem;
}

.btn-primary {
    background: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.8rem 1.8rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    box-shadow: 0 2px 6px rgba(0,0,0,0.04);
    transition: var(--transition-smooth);
}

.btn-primary:hover {
    background: var(--text-main);
    color: var(--bg-main);
    border-color: var(--text-main);
    transform: translateY(-1px);
}

.intro-authors {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
}

.authors-names {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    font-style: italic;
    color: var(--text-main);
    text-shadow: none;
}

.authors-sub {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-muted);
}

/* INTERFAZ PRINCIPAL CON TEXTURA DE PAPEL */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 2.5rem;
    border-bottom: 2px solid var(--border-color);
    background: var(--bg-card);
}

.brand-title {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 600;
    margin-right: 0.8rem;
}

.brand-sub {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.app-nav {
    display: flex;
    gap: 1.2rem;
}

.nav-link {
    background: none;
    border: none;
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.3rem 0.5rem;
    transition: var(--transition-smooth);
}

.nav-link.active, .nav-link:hover {
    color: var(--accent-red);
    border-bottom: 2px solid var(--accent-red);
}

.app-main {
    max-width: 900px;
    width: 100%;
    margin: 2rem auto;
    padding: 0 1.5rem;
    flex: 1;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* SELECTOR DE SEMIOSFERA */
.semiosphere-selector {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1.2rem;
    align-items: center;
    margin-bottom: 2rem;
}

.semiosphere-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 12px rgba(0,0,0,0.02);
}

.box-source .year, .box-target .year {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--accent-blue);
    margin: 0.2rem 0;
}

.btn-swap {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-swap:hover {
    border-color: var(--accent-red);
    color: var(--accent-red);
    transform: rotate(180deg);
}

/* CATÁLOGO CERRADO CON DETALLES TERRACOTA */
.catalog-section {
    margin-bottom: 2.5rem;
}

.catalog-title {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-red);
    margin-bottom: 1rem;
    letter-spacing: 0.08em;
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 0.9rem;
}

.catalog-card-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-blue);
    padding: 0.9rem 1.1rem;
    font-family: var(--font-serif);
    font-size: 1.15rem;
    color: var(--text-main);
    text-align: left;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.catalog-card-btn:hover {
    border-color: var(--text-main);
    border-left-color: var(--accent-red);
    transform: translateY(-2px);
    background: #ffffff;
}

.catalog-card-btn.active {
    border-color: var(--accent-red);
    border-left-color: var(--accent-red);
    background: var(--text-main);
    color: var(--bg-main);
}

/* FICHA DE RESULTADO */
.translation-display {
    min-height: 200px;
    margin-bottom: 3rem;
}

.display-placeholder {
    border: 1px dashed var(--border-color);
    padding: 2.5rem 2rem;
    text-align: center;
    color: var(--text-muted);
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.15rem;
}

.translation-card {
    background: var(--bg-card);
    border: 1px solid var(--text-main);
    padding: 2.2rem;
    box-shadow: 0 6px 20px rgba(0,0,0,0.04);
    animation: fadeIn 0.3s var(--transition-smooth);
}

.card-header {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.8rem;
    margin-bottom: 1.5rem;
}

.term-line {
    display: flex;
    align-items: baseline;
    gap: 0.8rem;
    margin: 0.6rem 0;
}

.term-value {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-main);
}

.frontier-transition-visual {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.2rem 0;
}

.transition-line {
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.transition-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    padding: 0.3rem 0.8rem;
    color: var(--accent-red);
}

.card-explanation {
    margin-top: 1.5rem;
    padding-top: 1.2rem;
    border-top: 1px dashed var(--border-color);
}

.card-explanation p {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-top: 0.4rem;
    color: var(--text-main);
}

/* MEMORIA */
.memory-section {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.memory-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
}

.memory-header h3 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
}

.memory-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.memory-item {
    display: flex;
    justify-content: space-between;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.7rem 1rem;
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

/* ARTÍCULOS DE LECTURA */
.story-article, .concept-article {
    background: var(--bg-card);
    padding: 3.5rem 3rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 16px rgba(0,0,0,0.03);
}

.story-header {
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.8rem;
    margin-bottom: 2.2rem;
}

.story-header h2, .concept-article h2 {
    font-family: var(--font-serif);
    font-size: 2.3rem;
    font-weight: 600;
}

.story-body p, .concept-article p {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    line-height: 1.85;
    margin-bottom: 1.6rem;
    color: #24211e;
    text-align: justify;
}

.story-end {
    text-align: center !important;
    font-family: var(--font-mono) !important;
    font-size: 0.85rem !important;
    color: var(--accent-red);
    margin-top: 2.5rem;
}

.editorial-quote {
    border-left: 3px solid var(--accent-red);
    padding-left: 1.2rem;
    margin: 1.8rem 0;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--text-main);
}

.editorial-quote cite {
    display: block;
    font-style: normal;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.6rem;
}

.disclaimer-text {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 1.5rem;
}

.app-footer {
    display: flex;
    justify-content: space-between;
    padding: 1.2rem 2.5rem;
    border-top: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.hidden { display: none !important; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 680px) {
    .semiosphere-selector { grid-template-columns: 1fr; }
    .btn-swap { margin: 0 auto; transform: rotate(90deg); }
    .app-header { flex-direction: column; gap: 1rem; text-align: center; }
    .story-article, .concept-article { padding: 2rem 1.2rem; }
    .catalog-grid { grid-template-columns: 1fr; }
}