/* Azul tinta = aprobado, rojo corrección = reprobado. Todos los pares de texto superan 4,5:1 */
    :root {
      color-scheme: light dark;
      --color-primary: #0b4fb3;
      --color-primary-dark: #093f8f;
      --color-on-primary: #ffffff;
      --color-blue: #0b4fb3;
      --color-red: #b3261e;
      --color-red-bg: #fdecea;
      --color-error-border: #f3b8b3;
      --color-text: #1b1f24;
      --color-text-muted: #565c66;
      --color-bg: #f4f5f7;
      --color-card: #ffffff;
      --color-border: #d5d9e0;
      --color-border-focus: #0b4fb3;
      --color-row-hover: #eef0f3;
      --color-head: #eceef2;
      --color-formula-bg: #eceff4;
      --color-highlight: #fff4c2;
      --color-highlight-border: #f59f00;
    }

    :root[data-theme="light"] {
      color-scheme: light;
    }

@media (prefers-color-scheme: dark) {
        :root:not([data-theme="light"]) {
        --color-primary: #8ab8ff;
        --color-primary-dark: #a9cbff;
        --color-on-primary: #101216;
        --color-blue: #8ab8ff;
        --color-red: #ff9a90;
        --color-red-bg: #3a1b19;
        --color-error-border: #6b2f2b;
        --color-text: #eceef2;
        --color-text-muted: #a3a9b4;
        --color-bg: #101216;
        --color-card: #1a1d23;
        --color-border: #333945;
        --color-border-focus: #8ab8ff;
        --color-row-hover: #242830;
        --color-head: #232730;
        --color-formula-bg: #20242c;
        --color-highlight: #3a3413;
        --color-highlight-border: #f5b43a;
      }
}

    :root[data-theme="dark"] {
      color-scheme: dark;
      --color-primary: #8ab8ff;
      --color-primary-dark: #a9cbff;
      --color-on-primary: #101216;
      --color-blue: #8ab8ff;
      --color-red: #ff9a90;
      --color-red-bg: #3a1b19;
      --color-error-border: #6b2f2b;
      --color-text: #eceef2;
      --color-text-muted: #a3a9b4;
      --color-bg: #101216;
      --color-card: #1a1d23;
      --color-border: #333945;
      --color-border-focus: #8ab8ff;
      --color-row-hover: #242830;
      --color-head: #232730;
      --color-formula-bg: #20242c;
      --color-highlight: #3a3413;
      --color-highlight-border: #f5b43a;
    }

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

    /* Fuentes locales (OFL), ver fonts/OFL-*.txt. Variables: un archivo cubre todos los pesos */
    @font-face {
      font-family: "Plex Sans";
      src: url("../../fonts/plex-sans.woff2") format("woff2");
      font-weight: 400 700;
      font-display: swap;
    }

    @font-face {
      font-family: "Bricolage Grotesque";
      src: url("../../fonts/bricolage.woff2") format("woff2");
      font-weight: 700 800;
      font-display: swap;
    }

    :root {
      --font-body: "Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
      --font-display: "Bricolage Grotesque", "Plex Sans", system-ui, sans-serif;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.6;
      padding: 1.25rem clamp(1rem, 3vw, 3rem) 3.5rem;
    }

    h1, h2, h3, .table-title, .result-grade {
      font-family: var(--font-display);
    }

    .icon {
      width: 1.25em;
      height: 1.25em;
      flex: none;
      fill: none;
      stroke: currentColor;
      stroke-width: 1.75;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    .container {
      max-width: 1560px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

@media (min-width: 860px) {
        .form-grid {
        grid-template-columns: 1fr;
      }
}

    .page-head {
      display: flex;
      align-items: center;
      gap: 1rem;
      padding-bottom: 0.25rem;
    }

    /* Decorativo: el título ya nombra la app */
    .brand-icon {
      flex: none;
      width: clamp(56px, 8vw, 80px);
      height: auto;
    }

    .page-head h1 {
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 800;
      line-height: 1.1;
      color: var(--color-text);
      letter-spacing: -0.03em;
      margin-bottom: 0.25rem;
    }

    .page-head p {
      color: var(--color-text-muted);
      font-size: 0.95rem;
    }

    .card {
      background: var(--color-card);
      border: 1px solid var(--color-border);
      border-radius: 12px;
      padding: 1.25rem;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    }

    /* Formulario */
    .form-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1rem;
    }

@media (min-width: 480px) {
        .form-grid {
        grid-template-columns: 1fr 1fr;
      }

        .form-grid .full-width {
        grid-column: span 2;
      }
}

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 0.35rem;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--color-text);
    }

    .form-group input,
    .form-group select,
    .avg-row input {
      font-size: 1.05rem;
      min-height: 44px;
      padding: 0.6rem 0.75rem;
      border: 1px solid var(--color-border);
      border-radius: 8px;
      background: var(--color-card);
      color: var(--color-text);
      transition: border-color 0.15s ease;
      width: 100%;
      -moz-appearance: textfield;
    }

    .form-group input::-webkit-outer-spin-button,
    .form-group input::-webkit-inner-spin-button {
      -webkit-appearance: none;
      margin: 0;
    }

    .form-group input:focus-visible,
    .form-group select:focus-visible,
    .avg-row input:focus-visible,
    .site-menu a:focus-visible,
    .site-brand:focus-visible,
    .btn:focus-visible {
      border-color: var(--color-border-focus);
      outline: 2px solid var(--color-border-focus);
      outline-offset: 1px;
    }

    .hint {
      font-size: 0.875rem;
      color: var(--color-text-muted);
    }

    /* Mensajes de error */
    .alert-error {
      background-color: var(--color-red-bg);
      border: 1px solid var(--color-error-border);
      color: var(--color-red);
      border-radius: 8px;
      padding: 0.75rem 1rem;
      font-size: 0.9rem;
      font-weight: 500;
      display: none;
    }

    .alert-error.visible {
      display: block;
    }

    /* Resultado Destacado */
    .result-card {
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.4rem;
      padding: 1.5rem 1rem;
      background: var(--color-card);
    }

    .result-status {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      font-size: 1rem;
      font-weight: 700;
    }

    .result-status[hidden],
    .btn[hidden] {
      display: none;
    }

    .result-label {
      font-size: 0.9rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: var(--color-text-muted);
    }

    /* Resultado grande y legible: tipografía de texto (cifras nítidas) con cifras de ancho fijo */
    .result-grade {
      font-family: var(--font-body);
      font-size: clamp(4.25rem, 22vw, 5.5rem);
      font-weight: 700;
      font-variant-numeric: tabular-nums;
      line-height: 1;
      letter-spacing: -0.02em;
    }

    .result-label {
      font-size: 1rem;
    }

    .result-status {
      font-size: 1.15rem;
    }

    .result-meta {
      font-size: 1.05rem;
      color: var(--color-text-muted);
    }

    .nota-azul {
      color: var(--color-blue);
    }

    .nota-roja {
      color: var(--color-red);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      font-size: 1rem;
      font-weight: 600;
      min-height: 44px;
      padding: 0.5rem 1rem;
      border-radius: 8px;
      border: 1px solid var(--color-border);
      background: var(--color-card);
      color: var(--color-text);
      cursor: pointer;
      transition: background 0.15s ease, border-color 0.15s ease;
    }

    .btn:hover {
      background: var(--color-row-hover);
    }

    .btn-primary {
      background: var(--color-primary);
      color: var(--color-on-primary);
      border-color: var(--color-primary);
    }

    .btn-primary:hover {
      background: var(--color-primary-dark);
      border-color: var(--color-primary-dark);
    }

    /* Contraste aumentado del sistema: bordes y textos secundarios más marcados */
@media (prefers-contrast: more) {
        :root {
        --color-border: #565c66;
        --color-text-muted: #1b1f24;
      }
}

@media (prefers-contrast: more) and (prefers-color-scheme: dark) {
        :root {
        --color-border: #a3a9b4;
        --color-text-muted: #eceef2;
      }
}

    /* Sección SEO Educativa y FAQ */
    .seo-content {
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
      margin-top: 1rem;
      border-top: 1px solid var(--color-border);
      padding-top: 1.5rem;
    }

    .seo-content h2 {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--color-text);
    }

    .seo-content h3 {
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--color-text);
      margin-top: 0.5rem;
    }

    .seo-content p, .seo-content li {
      font-size: 1rem;
      color: var(--color-text);
    }

    .formula-box {
      background: var(--color-formula-bg);
      border-left: 4px solid var(--color-primary);
      padding: 0.85rem 1rem;
      border-radius: 4px;
      font-family: monospace;
      font-size: 0.88rem;
      margin: 0.5rem 0;
      overflow-x: auto;
    }

    .seo-content > p {
      max-width: 72ch;
    }

    .faq-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 0.75rem;
    }

    .faq-item {
      background: var(--color-card);
      border: 1px solid var(--color-border);
      border-radius: 8px;
      padding: 0.85rem 1rem;
    }

    .meta-line {
      display: block;
      margin-top: 0.25rem;
      font-size: 0.875rem;
      color: var(--color-text-muted);
    }

    .seo-content a,
    .news-intro a {
      color: var(--color-primary);
      text-underline-offset: 2px;
    }

    .toc ul {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 0 1.5rem;
      padding: 0;
    }

    .toc a {
      display: flex;
      align-items: center;
      min-height: 44px;
      font-size: 0.95rem;
    }

    .faq-item {
      scroll-margin-top: 1rem;
    }

    .faq-item.wide {
      grid-column: 1 / -1;
    }

    .faq-item h3 {
      margin: 0 0 0.5rem;
      font-size: 1.05rem;
      line-height: 1.3;
    }

    .faq-item p + p,
    .faq-item .formula-box,
    .faq-item .info-table {
      margin-top: 0.75rem;
    }

    /* Noticias y comentarios */
    .news,
    .comments {
      display: flex;
      flex-direction: column;
      gap: 1rem;
      padding-top: 1.5rem;
      border-top: 1px solid var(--color-border);
    }

    .news[hidden],
    .comments[hidden] {
      display: none;
    }

    .news h2,
    .comments h2 {
      font-size: 1.35rem;
    }

    .news-intro,
    .comments > p {
      max-width: 72ch;
    }

    .comments .btn {
      align-self: flex-start;
    }

    .news-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 0.75rem;
      padding: 0;
    }

    .news-card {
      display: flex;
      flex-direction: column;
      gap: 0.35rem;
      height: 100%;
      padding: 0.85rem 1rem;
      border: 1px solid var(--color-border);
      border-radius: 8px;
      background: var(--color-card);
      color: inherit;
      text-decoration: none;
      transition: border-color 0.15s ease;
    }

    .news-card:hover,
    .news-card:focus-visible {
      border-color: var(--color-primary);
    }

    .news-card:focus-visible {
      outline: 2px solid var(--color-border-focus);
      outline-offset: 2px;
    }

    .news-meta {
      font-size: 0.875rem;
      color: var(--color-text-muted);
    }

    .news-card img {
      width: 100%;
      aspect-ratio: 16 / 9;
      object-fit: cover;
      border-radius: 6px;
    }

    .news-summary {
      font-size: 0.95rem;
      color: var(--color-text-muted);
    }

    .news-title {
      font-weight: 600;
      line-height: 1.35;
    }

    .site-nav {
      margin-top: 0.25rem;
    }

    .site-nav a {
      display: inline-block;
      padding: 0.5rem 0.5rem;
      color: var(--color-primary);
    }

    footer {
      text-align: center;
      font-size: 0.85rem;
      color: var(--color-text-muted);
      margin-top: 1.5rem;
    }

    /* =========================================
       MODO IMPRESIÓN OPTIMIZADO (@media print)
       ========================================= */
@media print {
        body {
        background: #ffffff !important;
        color: #000000 !important;
        padding: 0 !important;
        font-size: 10pt !important;
      }

        .container {
        max-width: 100% !important;
        gap: 0.5rem !important;
      }

        /* Ocultar elementos no imprimibles */
        header,
        .panel-inputs,
        section.card,
        #errorMessage,
        #resultCard,
        .table-actions,
        .seo-content,
        .legal-box,
        .tool-grid,
        .news,
        .comments,
        footer {
        display: none !important;
      }

        .nota-roja, .nota-azul {
        color: #000 !important;
      }
}

    /* ---- Sitio multipágina ---- */
    .site-header {
      max-width: 1560px;
      margin: 0 auto 1.25rem;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 0.5rem 1.5rem;
      padding-bottom: 0.75rem;
      border-bottom: 1px solid var(--color-border);
    }

    .site-brand {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-family: var(--font-display);
      font-size: 1.6rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--color-text);
      text-decoration: none;
    }

    .site-brand img {
      width: 52px;
      height: 52px;
    }

    /* Celular: cuadrícula de 2 × 2 con botones táctiles; desde 640 px, una fila */
    .site-menu {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 0.5rem;
      width: 100%;
    }

@media (min-width: 640px) {
        .site-menu {
        display: flex;
        flex-wrap: wrap;
        gap: 0.25rem;
        width: auto;
      }
}

    .site-menu a {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 44px;
      padding: 0 0.9rem;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--color-text);
      text-decoration: none;
      background: var(--color-head);
      border: 1px solid var(--color-border);
    }

    .site-menu a:hover {
      background: var(--color-row-hover);
      border-color: var(--color-primary);
    }

    .site-menu a[aria-current="page"] {
      background: var(--color-primary);
      border-color: var(--color-primary);
      color: var(--color-on-primary);
    }

    .site-footer p + .site-nav {
      margin-top: 0.25rem;
    }

    .prose {
      max-width: 70ch;
    }

    .prose h2 {
      font-family: var(--font-display);
      font-size: 1.4rem;
      margin: 1.5rem 0 0.5rem;
    }

    .prose p, .prose li {
      margin-bottom: 0.75rem;
    }

    .prose ul {
      padding-left: 1.25rem;
    }

    .prose a {
      color: var(--color-primary);
    }

    /* Portada: tarjetas de herramientas */
    .tool-grid {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 1rem;
    }

    .tool-card {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
      height: 100%;
      color: var(--color-text);
      text-decoration: none;
    }

    .tool-card:hover {
      border-color: var(--color-primary);
    }

    .tool-card:focus-visible {
      outline: 2px solid var(--color-border-focus);
      outline-offset: 2px;
    }

    .tool-card h2 {
      font-family: var(--font-display);
      font-size: 1.35rem;
      color: var(--color-primary);
    }

    .tool-card p {
      color: var(--color-text-muted);
    }

    /* Promedio y NEM */
    .tool-layout {
      display: grid;
      gap: 1.5rem;
      align-items: start;
    }

@media (min-width: 860px) {
        .tool-layout {
        grid-template-columns: minmax(320px, 520px) minmax(280px, 400px);
      }
}

    .avg-head,
    .avg-row {
      display: grid;
      grid-template-columns: 1fr 1fr 44px;
      gap: 0.5rem;
      align-items: center;
    }

    .avg-head {
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 0.35rem;
    }

    .avg-row {
      margin-bottom: 0.5rem;
    }

    .avg-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
      margin-top: 0.75rem;
    }

    .btn-del {
      padding: 0;
      justify-content: center;
      min-width: 44px;
    }

    /* Promedio: columna del resultado y botón de nota necesaria */
    .side-col {
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .btn-block {
      width: 100%;
      min-height: 48px;
      justify-content: center;
      text-align: center;
    }

    .goal-out {
      margin-top: 1rem;
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--color-primary);
    }

    .goal-out:empty {
      display: none;
    }

    /* Al cargar, "Promedio" y "Escala de notas" crecen y vuelven un par de píxeles para mostrar que se pueden pulsar */
    @keyframes nav-nudge {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.05); }
    }

    .site-menu a:nth-child(-n+2) {
      animation: nav-nudge 0.9s ease-in-out 0.5s 2;
    }

@media (prefers-reduced-motion: reduce) {
        .site-menu a:nth-child(-n+2) {
        animation: none;
      }
}

    /* Botón de modo claro / oscuro (esquina superior derecha) */
    .site-brand {
      flex: 1;
    }

    .theme-toggle {
      display: inline-grid;
      place-items: center;
      width: 44px;
      height: 44px;
      border-radius: 8px;
      border: 1px solid var(--color-border);
      background: var(--color-head);
      color: var(--color-text);
      cursor: pointer;
    }

    .theme-toggle:hover {
      background: var(--color-row-hover);
      border-color: var(--color-primary);
    }

    .theme-toggle:focus-visible {
      outline: 2px solid var(--color-border-focus);
      outline-offset: 2px;
    }

    .theme-toggle svg {
      width: 22px;
      height: 22px;
      fill: none;
      stroke: currentColor;
      stroke-width: 1.75;
      stroke-linecap: round;
    }

    .site-menu {
      order: 3;
    }

@media (min-width: 640px) {
        .site-brand {
        flex: none;
        margin-right: auto;
      }

        .site-menu {
        order: 1;
      }

        .theme-toggle {
        order: 2;
      }
}

    /* Controles con la misma tipografía del sitio (por defecto usan la del sistema) */
    button, input, select {
      font-family: inherit;
    }

    ::placeholder {
      color: var(--color-text-muted);
      opacity: 0.8;
    }

    /* Resultado vacío: guion discreto en vez de un bloque grueso */
    .result-grade.is-empty {
      color: var(--color-text-muted);
      font-weight: 400;
    }

    /* El atributo hidden debe ganarle siempre a los display de los componentes (p. ej. .form-group) */
    [hidden] {
      display: none !important;
    }

    /* Cuadro de normativa al final de las páginas de notas */
    .legal-box {
      margin-top: 1rem;
      padding: 1.25rem;
      background: var(--color-card);
      border: 1px solid var(--color-border);
      border-left: 4px solid var(--color-primary);
      border-radius: 12px;
    }

    .legal-box h2 {
      font-family: var(--font-display);
      font-size: 1.25rem;
      margin-bottom: 0.75rem;
    }

    .legal-box p,
    .legal-box li {
      max-width: 75ch;
      margin-bottom: 0.6rem;
    }

    .legal-box ul {
      padding-left: 1.25rem;
    }

    .legal-box a {
      color: var(--color-primary);
    }