/* ============================================================
   Laboratorio RNA — hoja de estilos compartida
   Curso: Redes Neuronales Artificiales
   ============================================================ */

:root {
    /* Superficies */
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #334155;
    --bg-inset: #0b1220;

    /* Tinta */
    --text-main: #f8fafc;
    --text-sub: #94a3b8;
    --text-muted: #64748b;
    --border: rgba(255, 255, 255, 0.1);

    /* Acentos de interfaz (chrome: botones, bordes, focos) */
    --accent-indigo: #6366f1;
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    --accent-rose: #f43f5e;
    --accent-amber: #f59e0b;
    --accent-violet: #8b5cf6;

    /* Paleta categórica de series (validada para CVD sobre #0f172a) */
    --series-1: #3987e5;  /* azul     */
    --series-2: #d95926;  /* naranja  */
    --series-3: #199e70;  /* aqua     */
    --series-4: #c98500;  /* amarillo */
    --series-5: #d55181;  /* magenta  */
    --series-6: #9085e9;  /* violeta  */

    /* Rampa secuencial (azul, claro → oscuro) para magnitudes ≥ 0 */
    --seq-100: #cde2fb;
    --seq-250: #86b6ef;
    --seq-400: #3987e5;
    --seq-550: #1c5cab;
    --seq-700: #0d366b;

    /* Divergente azul ↔ rojo con gris neutro, para cantidades con signo */
    --div-neg: #3987e5;
    --div-mid: #383835;
    --div-pos: #e34948;

    /* Estado */
    --ok: #199e70;
    --warn: #c98500;
    --bad: #e34948;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.55;
    padding-bottom: 3rem;
    -webkit-font-smoothing: antialiased;
}

/* ---------- Accesibilidad ---------- */
:focus-visible {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 2px;
    border-radius: 4px;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--accent-indigo);
    color: #fff;
    padding: 0.6rem 1rem;
    z-index: 999;
    border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.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;
}

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

/* ---------- Navegación ---------- */
nav {
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 0.85rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}
.nav-brand {
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}
.nav-brand span { color: var(--accent-indigo); }
.nav-links { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.nav-link {
    color: var(--text-sub);
    text-decoration: none;
    font-size: 0.85rem;
    padding: 0.35rem 0.7rem;
    border-radius: 6px;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
}
.nav-link:hover { color: var(--text-main); background: rgba(99, 102, 241, 0.18); }
.nav-link[aria-current="page"] {
    color: var(--text-main);
    background: rgba(99, 102, 241, 0.28);
    font-weight: 600;
}

/* ---------- Estructura ---------- */
.container { max-width: 1200px; margin: 2rem auto; padding: 0 1.5rem; }

.header-box { margin-bottom: 1.75rem; text-align: center; }
.header-box h1 {
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-indigo), var(--accent-cyan));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    line-height: 1.25;
}
.header-box p { color: var(--text-sub); font-size: 1.02rem; max-width: 800px; margin: 0 auto; }

/* ---------- Pestañas ---------- */
.tabs {
    display: flex;
    gap: 0.4rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.75rem;
    overflow-x: auto;
    scrollbar-width: thin;
}
.tab-btn {
    background: none;
    border: none;
    color: var(--text-sub);
    padding: 0.7rem 1.1rem;
    font-size: 0.92rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
    white-space: nowrap;
}
.tab-btn:hover { color: var(--text-main); }
.tab-btn[aria-selected="true"] {
    color: var(--accent-cyan);
    border-bottom-color: var(--accent-cyan);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ---------- Tarjetas ---------- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.4rem;
    margin-bottom: 1.4rem;
}
.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.card-sub { font-size: 0.88rem; color: var(--text-sub); margin-bottom: 1rem; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.4rem; }
.grid-2.wide-left { grid-template-columns: 1.35fr 1fr; }
@media (max-width: 900px) {
    .grid-2, .grid-2.wide-left { grid-template-columns: 1fr; }
}

/* ---------- Controles ---------- */
.controls {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    background: rgba(0, 0, 0, 0.22);
    padding: 1rem;
    border-radius: 8px;
}
.control-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 0.9rem; }
.control-group { display: flex; flex-direction: column; gap: 0.3rem; }
.control-group label {
    font-size: 0.82rem;
    color: var(--text-sub);
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
    align-items: baseline;
}
.control-group label output,
.control-group label .val {
    font-family: 'Fira Code', ui-monospace, monospace;
    color: var(--text-main);
    font-weight: 600;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--accent-cyan);
    cursor: pointer;
}

select, textarea, input[type="text"], input[type="number"] {
    background: var(--bg-input);
    color: var(--text-main);
    padding: 0.5rem 0.6rem;
    border-radius: 6px;
    border: 1px solid transparent;
    font-family: inherit;
    font-size: 0.9rem;
    width: 100%;
}
select:hover, textarea:hover { border-color: rgba(255,255,255,0.18); }
textarea { resize: vertical; line-height: 1.5; }

.btn {
    background: var(--accent-indigo);
    color: #fff;
    border: 1px solid transparent;
    padding: 0.55rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.87rem;
    font-family: inherit;
    cursor: pointer;
    transition: filter 0.2s, background 0.2s;
}
.btn:hover:not(:disabled) { filter: brightness(1.12); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-outline {
    background: transparent;
    border-color: var(--accent-indigo);
    color: #a5b4fc;
}
.btn-outline:hover:not(:disabled) { background: rgba(99, 102, 241, 0.15); }
.btn-group { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.btn-sm { padding: 0.38rem 0.7rem; font-size: 0.8rem; }

/* Grupo de opciones mutuamente excluyentes */
.segmented { display: inline-flex; gap: 0.3rem; flex-wrap: wrap; }
.segmented .btn { min-width: fit-content; }

/* ---------- Bloques de salida ---------- */
.formula-box {
    background: var(--bg-inset);
    padding: 0.9rem 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--accent-cyan);
    margin-bottom: 1rem;
    font-size: 0.92rem;
    overflow-x: auto;
}
.formula-box:last-child { margin-bottom: 0; }
.readout {
    background: var(--bg-inset);
    padding: 0.9rem 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--accent-indigo);
    font-size: 0.88rem;
    font-family: 'Fira Code', ui-monospace, monospace;
    line-height: 1.7;
    overflow-x: auto;
}
.readout strong { color: var(--text-main); }
.note {
    font-size: 0.85rem;
    color: var(--text-sub);
    background: rgba(99, 102, 241, 0.08);
    border-left: 3px solid var(--accent-indigo);
    padding: 0.75rem 0.9rem;
    border-radius: 0 8px 8px 0;
    margin-top: 1rem;
}
.note strong { color: var(--text-main); }
.note.warn { background: rgba(201, 133, 0, 0.1); border-left-color: var(--warn); }

/* Píldoras de estado */
.pill {
    display: inline-flex; align-items: center; gap: 0.35rem;
    font-size: 0.75rem; font-weight: 700;
    padding: 0.18rem 0.6rem; border-radius: 9999px;
    border: 1px solid currentColor;
    letter-spacing: 0.02em;
}
.pill.ok   { color: var(--ok); }
.pill.warn { color: var(--warn); }
.pill.bad  { color: var(--bad); }
.pill.info { color: var(--accent-cyan); }

/* Cifras destacadas */
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 0.75rem; }
.stat {
    background: var(--bg-inset);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.8rem 0.9rem;
}
.stat .stat-label { font-size: 0.74rem; color: var(--text-sub); text-transform: uppercase; letter-spacing: 0.05em; }
.stat .stat-value {
    font-size: 1.35rem; font-weight: 700;
    font-family: 'Fira Code', ui-monospace, monospace;
    line-height: 1.3; margin-top: 0.15rem;
}
.stat .stat-hint { font-size: 0.76rem; color: var(--text-muted); }

/* ---------- Gráficos ---------- */
.chart-box { position: relative; width: 100%; }
canvas {
    background: var(--bg-inset);
    border-radius: 8px;
    display: block;
    width: 100%;
}
figcaption, .fig-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Leyenda manual (para lienzos propios) */
.legend { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 0.6rem; font-size: 0.82rem; }
.legend-item { display: inline-flex; align-items: center; gap: 0.4rem; color: var(--text-sub); }
.legend-swatch { width: 12px; height: 12px; border-radius: 3px; flex-shrink: 0; }
.legend-swatch.line { height: 3px; border-radius: 2px; width: 16px; }

/* ---------- Matrices / mapas de calor ---------- */
.matrix-wrap { overflow-x: auto; padding-bottom: 0.25rem; }
.matrix {
    display: grid;
    gap: 3px;
    background: rgba(0, 0, 0, 0.3);
    padding: 5px;
    border-radius: 8px;
    width: fit-content;
}
.matrix-cell {
    min-width: 40px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Fira Code', ui-monospace, monospace;
    font-size: 0.76rem;
    font-weight: 600;
    background: var(--bg-input);
    border-radius: 4px;
    border: 2px solid transparent;
    transition: border-color 0.15s, transform 0.15s;
    padding: 0 0.35rem;
    cursor: default;
}
.matrix-cell.sm { min-width: 30px; height: 28px; font-size: 0.68rem; }
.matrix-cell.hl { border-color: var(--accent-cyan); }
.matrix-cell.hl-row { border-color: rgba(6, 182, 212, 0.55); }
.matrix-cell.dim { opacity: 0.3; }
.matrix-cell.masked { background: repeating-linear-gradient(45deg, #1b2436, #1b2436 4px, #0f172a 4px, #0f172a 8px); color: var(--text-muted); }
.matrix-cell.clickable { cursor: pointer; }
.matrix-cell.clickable:hover { transform: scale(1.06); border-color: var(--accent-cyan); }
.matrix-label {
    display: flex; align-items: center; justify-content: center;
    font-size: 0.72rem; color: var(--text-sub); font-weight: 600;
    min-width: 40px; height: 36px; padding: 0 0.3rem;
    text-align: center;
}
.matrix-label.sm { min-width: 30px; height: 28px; font-size: 0.66rem; }
.matrix-caption { font-size: 0.78rem; color: var(--text-sub); text-align: center; margin-bottom: 0.35rem; font-weight: 600; }

/* Barra de escala de color */
.colorbar { display: flex; align-items: center; gap: 0.5rem; font-size: 0.74rem; color: var(--text-muted); margin-top: 0.5rem; font-family: 'Fira Code', ui-monospace, monospace; }
.colorbar-ramp { height: 10px; flex: 1; min-width: 80px; border-radius: 5px; }

/* ---------- Tablas ---------- */
.data-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.data-table th, .data-table td {
    border: 1px solid var(--border);
    padding: 0.55rem 0.7rem;
    text-align: left;
}
.data-table th { background: rgba(0, 0, 0, 0.35); color: var(--accent-cyan); font-weight: 700; }
.data-table td.num { font-family: 'Fira Code', ui-monospace, monospace; text-align: right; }
.data-table tbody tr:hover { background: rgba(255, 255, 255, 0.035); }
.table-wrap { overflow-x: auto; }

/* ---------- Fichas / etiquetas de token ---------- */
.token-row { display: flex; flex-wrap: wrap; gap: 0.35rem; align-items: center; }
.token {
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    font-family: 'Fira Code', ui-monospace, monospace;
    font-size: 0.82rem;
    background: rgba(99, 102, 241, 0.18);
    border: 1px solid rgba(99, 102, 241, 0.45);
    white-space: pre;
}
.token.new { background: rgba(25, 158, 112, 0.2); border-color: var(--ok); color: #6ee7b7; }
.token.merged { background: rgba(201, 133, 0, 0.2); border-color: var(--warn); color: #fcd34d; }

/* ---------- Autoevaluación ---------- */
.quiz { border: 1px solid var(--border); border-radius: 12px; background: var(--bg-card); padding: 1.4rem; margin-bottom: 1.4rem; }
.quiz-q { margin-bottom: 1.3rem; }
.quiz-q:last-of-type { margin-bottom: 0.5rem; }
.quiz-prompt { font-weight: 600; margin-bottom: 0.6rem; font-size: 0.95rem; }
.quiz-opts { display: flex; flex-direction: column; gap: 0.4rem; }
.quiz-opt {
    text-align: left;
    background: var(--bg-inset);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.6rem 0.85rem;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.88rem;
    transition: border-color 0.2s, background 0.2s;
    display: flex;
    gap: 0.6rem;
    align-items: flex-start;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--accent-indigo); background: rgba(99, 102, 241, 0.1); }
.quiz-opt .mark { font-weight: 700; flex-shrink: 0; width: 1.1em; }
.quiz-opt.correct { border-color: var(--ok); background: rgba(25, 158, 112, 0.14); }
.quiz-opt.wrong { border-color: var(--bad); background: rgba(227, 73, 72, 0.12); }
.quiz-opt:disabled { cursor: default; }
.quiz-feedback {
    margin-top: 0.6rem;
    font-size: 0.86rem;
    padding: 0.65rem 0.85rem;
    border-radius: 8px;
    background: var(--bg-inset);
    border-left: 3px solid var(--accent-indigo);
    display: none;
}
.quiz-feedback.show { display: block; }
.quiz-score { font-size: 0.88rem; color: var(--text-sub); margin-top: 1rem; }

/* ---------- Pie / navegación entre clases ---------- */
.lab-footer {
    max-width: 1200px;
    margin: 2.5rem auto 0;
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.88rem;
}
.lab-footer a { color: var(--accent-cyan); text-decoration: none; font-weight: 600; }
.lab-footer a:hover { text-decoration: underline; }
.lab-footer .muted { color: var(--text-muted); }

/* ---------- Utilidades ---------- */
.mono { font-family: 'Fira Code', ui-monospace, monospace; }
.mt-1 { margin-top: 0.5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; } .mb-2 { margin-bottom: 1rem; }
.flex-between { display: flex; justify-content: space-between; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.text-sub { color: var(--text-sub); }
.small { font-size: 0.85rem; }