/* =====================================================================
   Mi Biblioteca — Sistema "Ficha de catálogo / Ex-libris"
   Tinta sobre papel, sello de lectura como elemento firma.
   ===================================================================== */

/* ---- Tipografías auto-alojadas (CSP font-src 'self') ---- */
@font-face {
    font-family: 'Fraunces';
    src: url('fonts/fraunces.woff2') format('woff2');
    font-weight: 400 900;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Public Sans';
    src: url('fonts/publicsans.woff2') format('woff2');
    font-weight: 400 700;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Spline Sans Mono';
    src: url('fonts/splinemono.woff2') format('woff2');
    font-weight: 400 600;
    font-style: normal;
    font-display: swap;
}

/* ---- Tokens ---- */
:root {
    /* Papel herbario (verde-grisáceo, no crema SaaS) */
    --paper:       #e5e4d9;
    --paper-card:  #f1f0e7;
    --paper-sunk:  #dcdbce;
    --edge:        #cdcbba;   /* keylines */
    --edge-strong: #b6b4a0;

    --ink:         #20211c;
    --ink-soft:    #5b5c51;
    --fir:         #14201b;

    --oxblood:     #8a2b27;   /* SELLO — solo sello, valoración, abandonado */
    --brass:       #a87b2a;   /* decorativo (filetes, foco) */
    --link:        #6e4e12;   /* enlaces de texto (accesible sobre papel) */
    --teal:        #2e5c52;

    --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
    --font-body:    'Public Sans', system-ui, -apple-system, Segoe UI, sans-serif;
    --font-mono:    'Spline Sans Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    --radius: 4px;
    --shadow: 2px 3px 0 rgba(32, 33, 28, 0.06), 6px 10px 22px rgba(32, 33, 28, 0.08);
    --shadow-lift: 3px 5px 0 rgba(32, 33, 28, 0.08), 10px 18px 34px rgba(32, 33, 28, 0.12);

    /* compat: tokens antiguos que aún referencian plantillas/CSS */
    --primary-color: var(--fir);
    --secondary-color: var(--teal);
    --accent-color: var(--brass);
    --text-color: var(--ink);
    --text-light: var(--ink-soft);
    --bg-light: var(--paper);
    --white: var(--paper-card);
    --error: var(--oxblood);
    --success: var(--teal);
    --warning: var(--brass);
    --border: var(--edge);
}

@media (prefers-color-scheme: dark) {
    :root {
        --paper:       #14201b;   /* sala de lectura nocturna */
        --paper-card:  #1b2a23;
        --paper-sunk:  #101a15;
        --edge:        #2c3d34;
        --edge-strong: #3c5249;

        --ink:         #ece7d8;
        --ink-soft:    #9da89a;
        --fir:         #ece7d8;

        --oxblood:     #cf5a52;
        --brass:       #cd9d4c;
        --link:        #d6ab5a;
        --teal:        #74b6a5;

        --shadow: 2px 3px 0 rgba(0,0,0,0.25), 6px 10px 22px rgba(0,0,0,0.35);
        --shadow-lift: 3px 5px 0 rgba(0,0,0,0.3), 10px 18px 34px rgba(0,0,0,0.45);
    }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background-color: var(--paper);
    color: var(--ink);
    margin: 0;
    min-height: 100vh;
    line-height: 1.6;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* Trama sutil de papel de cuaderno (muy tenue) */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
        radial-gradient(120% 90% at 50% -10%, rgba(168,123,42,0.06), transparent 60%),
        repeating-linear-gradient(0deg, transparent 0 31px, rgba(32,33,28,0.025) 31px 32px);
}

/* Fondo viejo (blobs) neutralizado: el markup ya no los usa, pero por si acaso */
.liquid-bg, .blob { display: none !important; }

/* ---- Accesibilidad ---- */
.skip-link {
    position: absolute; left: -9999px; top: 0;
    background: var(--fir); color: var(--paper-card);
    padding: 12px 18px; font-family: var(--font-mono);
    font-weight: 600; z-index: 2000; text-decoration: none;
}
.skip-link:focus { left: 0; outline: 3px solid var(--brass); outline-offset: 2px; }

.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

a:focus-visible, button:focus-visible, [role="button"]:focus-visible,
summary:focus-visible, input:focus-visible, select:focus-visible,
textarea:focus-visible, details:focus-visible {
    outline: 2.5px solid var(--brass);
    outline-offset: 2px;
    border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

/* ---- Tipografía ---- */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-optical-sizing: auto;
    color: var(--ink);
    line-height: 1.12;
    font-weight: 560;
    letter-spacing: -0.01em;
    margin: 0 0 0.6em;
}
h2 { font-size: clamp(1.6rem, 4vw, 2.2rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1rem; }

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

.eyebrow,
.text-light { color: var(--ink-soft); }

/* Etiqueta mono en versalitas — el "tono de fichero" */
.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    color: var(--ink-soft);
}

/* ---- Cabecera + Ex-libris ---- */
header {
    max-width: 1080px;
    margin: 0 auto;
    padding: 38px 24px 6px;
}
header .exlibris {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--ink-soft);
    margin: 0 0 6px;
}
header h1 {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2.1rem, 6vw, 3.1rem);
    margin: 0;
    letter-spacing: -0.02em;
}
header h1 .amp { color: var(--oxblood); }

/* ---- Navegación (índice de fichero) ---- */
nav[aria-label] {
    max-width: 1080px;
    margin: 14px auto 0;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    gap: 26px;
    flex-wrap: wrap;
    border-top: 1px solid var(--edge);
    border-bottom: 2px solid var(--ink);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
}
nav[aria-label] a {
    color: var(--ink);
    text-decoration: none;
    padding-bottom: 2px;
    border-bottom: 2px solid transparent;
}
nav[aria-label] a:hover { border-bottom-color: var(--brass); }
nav[aria-label] a[aria-current="page"] {
    color: var(--oxblood);
    border-bottom-color: var(--oxblood);
}
.nav-logout-btn {
    background: none; border: none; cursor: pointer; padding: 0;
    font: inherit; color: var(--ink-soft);
    text-transform: uppercase; letter-spacing: 0.12em;
}
.nav-logout-btn:hover { color: var(--oxblood); }

main {
    max-width: 1080px;
    margin: 0 auto;
    padding: 34px 24px 60px;
}

footer {
    max-width: 1080px;
    margin: 0 auto;
    padding: 30px 24px 50px;
    border-top: 1px solid var(--edge);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    color: var(--ink-soft);
    text-transform: uppercase;
}

/* ---- Botones ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    text-decoration: none;
    cursor: pointer;
    padding: 10px 18px;
    border-radius: var(--radius);
    border: 1.5px solid var(--ink);
    background: var(--paper-card);
    color: var(--ink);
    transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
    box-shadow: 2px 2px 0 var(--ink);
}
.btn:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--ink); }
.btn:active { transform: translate(1px, 1px); box-shadow: 1px 1px 0 var(--ink); }

.btn-sm { padding: 6px 12px; font-size: 0.72rem; }

.btn-primary { background: var(--fir); color: var(--paper); border-color: var(--fir); box-shadow: 2px 2px 0 var(--ink); }
.btn-primary:hover { background: #1c2c25; }

.btn-secondary { background: var(--paper-card); color: var(--ink); }

.btn-danger { background: var(--paper-card); color: var(--oxblood); border-color: var(--oxblood); box-shadow: 2px 2px 0 var(--oxblood); }
.btn-danger:hover { background: var(--oxblood); color: var(--paper-card); }

@media (prefers-color-scheme: dark) {
    .btn { box-shadow: 2px 2px 0 #000; border-color: var(--edge-strong); }
    .btn:hover { box-shadow: 3px 3px 0 #000; }
    .btn-primary { background: var(--teal); color: var(--paper-sunk); border-color: var(--teal); }
}

/* ---- Formularios ---- */
.form-group { margin-bottom: 18px; }
.form-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--ink-soft);
    margin-bottom: 7px;
}
.form-control, .form-control-sm,
input[type="text"], input[type="email"], input[type="password"],
input[type="number"], input[type="date"], select, textarea {
    width: 100%;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--ink);
    background: var(--paper-card);
    border: 1.5px solid var(--edge-strong);
    border-radius: var(--radius);
    padding: 11px 13px;
    transition: border-color 0.12s ease, box-shadow 0.12s ease;
}
.form-control-sm { padding: 8px 11px; font-size: 0.95rem; }
.form-control:focus, .form-control-sm:focus,
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--fir);
    box-shadow: inset 0 -2px 0 var(--brass);
}
.form-control::placeholder { color: var(--ink-soft); opacity: 0.7; }
textarea { min-height: 120px; resize: vertical; }
.form-text, small { color: var(--ink-soft); font-size: 0.86rem; }

/* ---- Tarjeta base (la "ficha") ---- */
.card {
    background: var(--paper-card);
    border: 1px solid var(--edge);
    border-radius: var(--radius);
    padding: 26px;
    box-shadow: var(--shadow);
}

/* ---- Rejilla y ficha de libro ---- */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 22px;
}

.book-card {
    background: var(--paper-card);
    border: 1px solid var(--edge);
    border-left: 3px solid var(--edge-strong);
    border-radius: var(--radius);
    padding: 18px 18px 20px;
    display: flex;
    flex-direction: column;
    height: 100%;
    box-shadow: var(--shadow);
    transition: transform 0.16s ease, box-shadow 0.16s ease, border-left-color 0.16s ease;
}
.book-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lift);
    border-left-color: var(--oxblood);
}
.book-card img {
    width: 100%;
    height: 270px;
    object-fit: cover;
    border: 1px solid var(--edge-strong);
    border-radius: 2px;
    margin-bottom: 16px;
    box-shadow: 3px 4px 0 rgba(32,33,28,0.08);
    background: var(--paper-sunk);
}
.book-card-no-cover {
    width: 100%; height: 270px; border-radius: 2px; margin-bottom: 16px;
    display: flex; align-items: center; justify-content: center;
    background: var(--paper-sunk); border: 1px dashed var(--edge-strong);
    color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.8rem;
}
.book-card h3 {
    font-family: var(--font-display);
    font-size: 1.18rem;
    font-weight: 540;
    line-height: 1.22;
    margin: 0 0 6px;
}
.book-card p { margin: 0 0 12px; }
.book-card .form-text { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.01em; }

/* ---- ELEMENTO FIRMA: el sello de lectura ---- */
.rating-display {
    display: inline-block;
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.82rem;
    letter-spacing: 0.06em;
    color: var(--oxblood);
    border: 2px solid var(--oxblood);
    border-radius: 3px;
    padding: 4px 10px;
    transform: rotate(-3deg);
    box-shadow: 0 0 0 1px var(--paper-card), 0 0 0 3px rgba(138,43,39,0.12);
    mix-blend-mode: multiply;
}
@media (prefers-color-scheme: dark) { .rating-display { mix-blend-mode: normal; } }

.rating-large {
    font-family: var(--font-mono);
    color: var(--oxblood);
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: 0.08em;
}

/* Pie de fecha de lectura, en mono como una anotación */
.reading-stamp {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    padding-top: 12px;
}
.reading-date {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-soft);
}

/* ---- Cajón por año (details) ---- */
.by-year-list { display: flex; flex-direction: column; gap: 18px; }
.year-block {
    background: var(--paper-card);
    border: 1px solid var(--edge);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.year-summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: baseline;
    gap: 18px;
    flex-wrap: wrap;
    padding: 18px 22px;
    background: var(--paper-card);
    border-left: 4px solid var(--oxblood);
    transition: background 0.12s ease;
}
.year-summary::-webkit-details-marker { display: none; }
.year-summary:hover { background: var(--paper-sunk); }
.year-summary::after {
    content: "▸";
    margin-left: auto;
    color: var(--ink-soft);
    transition: transform 0.18s ease;
}
.year-block[open] .year-summary::after { transform: rotate(90deg); }
.year-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1;
}
.year-meta {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.08em;
    color: var(--ink-soft);
    display: inline-flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
}
.year-body { padding: 8px 22px 26px; border-top: 1px solid var(--edge); }
.status-section-title { margin: 22px 0 14px; }

/* ---- Etiquetas de estado ---- */
.status-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 2px 8px;
    border-radius: 2px;
    border: 1px solid currentColor;
    line-height: 1.5;
}
.status-leído      { color: var(--teal); }
.status-leyendo    { color: var(--brass); }
.status-pendiente  { color: var(--ink-soft); }
.status-abandonado { color: var(--oxblood); }

/* ---- Alertas ---- */
.alert {
    border: 1px solid var(--edge-strong);
    border-left: 4px solid var(--ink-soft);
    border-radius: var(--radius);
    padding: 13px 16px;
    margin-bottom: 18px;
    background: var(--paper-card);
    font-size: 0.95rem;
}
.alert-error   { border-left-color: var(--oxblood); color: var(--ink); }
.alert-success { border-left-color: var(--teal); color: var(--ink); }

/* ---- Insignias / tabla (panel admin) ---- */
.badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--oxblood);
    border: 1.5px solid var(--oxblood);
    border-radius: 2px;
    padding: 1px 7px;
}
.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}
.table th {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-soft);
    text-align: left;
    padding: 10px 12px;
    border-bottom: 2px solid var(--ink);
}
.table td { padding: 12px; border-bottom: 1px solid var(--edge); vertical-align: middle; }
.table tr:hover td { background: var(--paper-sunk); }

/* ---- Estado vacío ---- */
.empty-state { text-align: center; padding: 48px 30px; }
.empty-state-icon { font-size: 2.6rem; margin-bottom: 10px; opacity: 0.8; filter: grayscale(0.2); }

/* ---- Paginación ---- */
.pagination {
    display: flex; align-items: center; justify-content: center;
    gap: 18px; flex-wrap: wrap;
}
.pagination-info {
    font-family: var(--font-mono); font-size: 0.78rem;
    letter-spacing: 0.06em; color: var(--ink-soft);
}

/* ---- Cajas informativas ---- */
.info-box, .observation-box, .api-source-info, .debug-log {
    background: var(--paper-sunk);
    border: 1px solid var(--edge);
    border-left: 4px solid var(--brass);
    border-radius: var(--radius);
    padding: 16px 18px;
}
.debug-log { font-family: var(--font-mono); font-size: 0.8rem; white-space: pre-wrap; }
.search-source-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.66rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.1em;
    color: var(--teal); border: 1px solid var(--teal);
    border-radius: 2px; padding: 1px 7px; margin-bottom: 10px;
}

/* ---- Estadísticas ---- */
.ranking-hero, .stats-grid, .ranking-grid {
    margin-bottom: 28px;
}
.ranking-hero {
    display: flex; flex-direction: column; gap: 4px;
    border-bottom: 2px solid var(--ink); padding-bottom: 16px;
}
.stats-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 18px;
}
.stats-card {
    background: var(--paper-card);
    border: 1px solid var(--edge);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
}
.stats-count {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--ink);
    text-align: right;
}
.stats-number {
    font-family: var(--font-display);
    font-size: 2.6rem; font-weight: 600; line-height: 1;
    color: var(--oxblood);
}
.stats-label {
    font-family: var(--font-mono); font-size: 0.72rem;
    text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-soft);
}
.stats-table { width: 100%; border-collapse: collapse; }
.stats-table th, .stats-table td { padding: 10px 12px; border-bottom: 1px solid var(--edge); text-align: left; }
.stats-table th { font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-soft); }

/* Barras de distribución de valoraciones */
.stat-bars { display: flex; flex-direction: column; gap: 10px; margin-top: 6px; }
.stat-bar-row { display: flex; align-items: center; gap: 12px; }
.stat-bar-label {
    font-family: var(--font-mono); font-size: 0.8rem; font-weight: 600;
    color: var(--oxblood); min-width: 3ch; text-align: right;
}
.stat-bar-track {
    flex: 1; height: 14px; background: var(--paper-sunk);
    border: 1px solid var(--edge); border-radius: 2px; overflow: hidden;
}
.stat-bar-fill {
    display: block; height: 100%; min-width: 2px;
    background: repeating-linear-gradient(45deg, var(--oxblood) 0 6px, #9c3733 6px 12px);
}
.stat-bar-count {
    font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-soft);
    min-width: 2ch; text-align: right;
}

/* ---- Ranking ---- */
.ranking-section-title {
    font-family: var(--font-display);
    border-bottom: 1px solid var(--edge); padding-bottom: 8px; margin-bottom: 16px;
}
.ranking-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; }
.ranking-list { display: flex; flex-direction: column; gap: 10px; list-style: none; padding: 0; margin: 0; }
.ranking-item {
    display: flex; align-items: center; gap: 14px;
    background: var(--paper-card); border: 1px solid var(--edge);
    border-radius: var(--radius); padding: 12px 14px;
}
.ranking-num {
    font-family: var(--font-mono); font-weight: 600; font-size: 1.1rem;
    color: var(--ink-soft); min-width: 2ch;
}
.ranking-item.gold   .ranking-num { color: var(--brass); }
.ranking-item.silver .ranking-num { color: var(--ink-soft); }
.ranking-item.bronze .ranking-num { color: var(--oxblood); }
.ranking-info { flex: 1; min-width: 0; }
.ranking-info strong { display: block; font-family: var(--font-display); font-weight: 540; font-size: 1.02rem; line-height: 1.2; }
.ranking-info span { font-family: var(--font-mono); font-size: 0.74rem; color: var(--ink-soft); }
.ranking-badges { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.ranking-cover { width: 44px; height: 64px; object-fit: cover; border: 1px solid var(--edge-strong); border-radius: 2px; }

/* ---- Detalle / añadir / descripciones ---- */
.book-detail { display: grid; grid-template-columns: minmax(180px, 240px) 1fr; gap: 32px; align-items: start; }
.book-cover-container { position: relative; }
.book-cover-large { display: flex; flex-direction: column; gap: 18px; }
.book-cover-img, .book-cover-large img {
    width: 100%; display: block; border: 1px solid var(--edge-strong); border-radius: 2px;
    box-shadow: var(--shadow); background: var(--paper-sunk);
}
.description-text { line-height: 1.7; max-width: 62ch; }

/* Pestañas "Añadir libro" (acordeón tipo cajón) */
.add-book-tabs { display: flex; flex-direction: column; gap: 16px; }
.add-book-tabs details {
    background: var(--paper-card); border: 1px solid var(--edge);
    border-left: 3px solid var(--edge-strong); border-radius: var(--radius);
    box-shadow: var(--shadow); overflow: hidden;
}
.add-book-tabs details[open] { border-left-color: var(--oxblood); }
.add-tab-title {
    list-style: none; cursor: pointer;
    font-family: var(--font-display); font-size: 1.15rem; font-weight: 540;
    padding: 16px 20px; display: flex; align-items: center; gap: 10px; margin: 0;
}
.add-tab-title::-webkit-details-marker { display: none; }
.add-tab-title::before {
    content: "▸"; font-family: var(--font-mono); color: var(--ink-soft);
    transition: transform 0.18s ease;
}
.add-book-tabs details[open] .add-tab-title::before { transform: rotate(90deg); }
.add-tab-body { padding: 4px 20px 22px; }

/* ---- Utilidades ---- */
.d-flex { display: flex; }
.d-inline-block { display: inline-block; }
.flex-1 { flex: 1; }
.flex-wrap { flex-wrap: wrap; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-items-center { align-items: center; }
.align-center { text-align: center; }
.gap-10 { gap: 10px; }
.gap-20 { gap: 20px; }
.gap-30 { gap: 30px; }
.mt-0 { margin-top: 0; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.hr-spacer { height: 1px; background: var(--edge); border: 0; margin: 34px 0; }

/* ---- Entrada en escena (sutil, sin volar) ---- */
@keyframes settle {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}
.book-card, .year-block, .stats-card, .card {
    animation: settle 0.4s ease both;
}
.book-card:nth-child(2) { animation-delay: 0.04s; }
.book-card:nth-child(3) { animation-delay: 0.08s; }
.book-card:nth-child(4) { animation-delay: 0.12s; }
.book-card:nth-child(5) { animation-delay: 0.16s; }
.book-card:nth-child(6) { animation-delay: 0.2s; }

/* ---- Responsive ---- */
@media (max-width: 640px) {
    body { font-size: 16px; }
    header { padding-top: 26px; }
    nav[aria-label] { gap: 16px; }
    .book-detail { grid-template-columns: 1fr; }
    .book-card img, .book-card-no-cover { height: 220px; }
}