:root {
      /* Base colour palette adapted for a clowncore & Y2K vibe */
      --bg: #1f0337;
      /* panels are semi‑transparent to allow the colourful background to shine through */
      --bg-panel: rgba(16, 8, 36, 0.8);
      --bg-panel-soft: rgba(16, 8, 36, 0.6);
      /* hot pink accent for buttons and highlights */
      --accent: #ff2eb8;
      --accent-soft: rgba(255, 46, 184, 0.15);
      /* border hues are lighter purples */
      --border-soft: rgba(186, 133, 255, 0.4);
      /* text colours: bright pastel off‑white for main text and pale lavender for muted */
      --text-main: #f5e9ff;
      --text-muted: #cbb2d9;
      /* secondary backgrounds: darker but with a tint of purple */
      --secondary-bg: rgba(32, 16, 64, 0.85);
      --secondary-border: rgba(186, 133, 255, 0.5);
      --secondary-text: #f5e9ff;
      /* input backgrounds are translucent for a glassy look */
      --input-bg: rgba(32, 16, 64, 0.7);
      --input-border: rgba(186, 133, 255, 0.5);
      /* table colours follow the same palette */
      --table-header-bg: rgba(32, 16, 64, 0.9);
      --table-border: rgba(94, 68, 140, 0.8);
      --table-row-even-bg: rgba(32, 16, 64, 0.6);
      /* tracks use a darker backdrop to make colourful segments pop */
      --track-bg: rgba(32, 16, 64, 0.9);
      --track-border: rgba(186, 133, 255, 0.7);
      --track-title-bg: rgba(16, 8, 36, 0.9);
      --scale-label-bg: rgba(16, 8, 36, 0.9);
      /* default lithology fill when there is no pattern */
      --litho-vacio-bg: #2d1849;
      /* border radii remain generous */
      --radius-lg: 16px;
      --radius-xl: 24px;
      --radius-pill: 999px;
      /* a softer but still pronounced drop shadow */
      --shadow-soft: 0 20px 50px rgba(0, 0, 0, 0.5);
    }
    .light-mode {
      --bg: #f8fafc;
      --bg-panel: #ffffff;
      --bg-panel-soft: #e5e7eb;
      --accent: #f97316;
      --accent-soft: #fff7ed;
      --border-soft: #cbd5e1;
      --text-main: #0f172a;
      --text-muted: #475569;
      --secondary-bg: #f1f5f9;
      --secondary-border: #cbd5e1;
      --secondary-text: #0f172a;
      --input-bg: #ffffff;
      --input-border: #94a3b8;
      --table-header-bg: #e2e8f0;
      --table-border: #cbd5e1;
      --table-row-even-bg: #f9fafb;
      --track-bg: #ffffff;
      --track-border: #cbd5e1;
      --track-title-bg: #ffffff;
      --scale-label-bg: #ffffff;
      --litho-vacio-bg: #f1f5f9;
      --shadow-soft: 0 10px 25px rgba(0,0,0,0.08);
    }

    * { box-sizing: border-box; }

    body {
      margin: 0;
      padding: 0;
      /* playful, rounded font reminiscent of early 2000s and comic graphics */
      font-family: "Comic Sans MS", "Trebuchet MS", sans-serif;
      /* vivid, shifting gradient for the overall page */
      background: linear-gradient(135deg, #ff00cc, #3333ff, #00ffee, #ffea00);
      background-size: 600% 600%;
      animation: bgShift 20s ease infinite;
      color: var(--text-main);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }
    /* smooth gradient animation */
    @keyframes bgShift {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }
    /* override for light mode: use a pastel rainbow gradient */
    .light-mode body {
      background: linear-gradient(135deg, #ff99c9, #fad0c4, #e0c3fc, #8ec5fc);
      animation: bgShiftLight 25s ease infinite;
    }
    @keyframes bgShiftLight {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

    h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: 0.02em; }

    .app-shell {
      display: grid;
      grid-template-columns: 320px minmax(0, 1fr);
      gap: 18px;
      padding: 16px;
      max-width: 1400px;
      margin: 0 auto 24px auto;
    }

    @media (max-width: 900px) {
      .app-shell { grid-template-columns: 1fr; }
    }

    .panel {
      background: linear-gradient(135deg, var(--bg-panel), var(--bg-panel-soft));
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-soft);
      box-shadow: var(--shadow-soft);
      padding: 14px 16px 16px;
      position: relative;
      overflow: hidden;
    }

    .panel::before {
      content: "";
      position: absolute;
      inset: 0;
      /* confetti‑style overlay using multiple radial gradients */
      background-image:
        radial-gradient(circle at 10% 20%, rgba(255,255,255,0.12) 0px, transparent 3px),
        radial-gradient(circle at 80% 70%, rgba(255,255,255,0.1) 0px, transparent 3px),
        radial-gradient(circle at 50% 50%, rgba(255,255,255,0.08) 0px, transparent 4px);
      background-size: 140px 140px, 200px 200px, 260px 260px;
      opacity: 0.8;
      pointer-events: none;
    }

    .panel-inner { position: relative; z-index: 1; }

    .panel-header-main {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: 8px;
      margin-bottom: 10px;
    }

    .panel-header-main h1 { font-size: 1.05rem; }

    .chip {
      font-size: 0.72rem;
      padding: 3px 9px;
      border-radius: var(--radius-pill);
      background: var(--accent-soft);
      color: var(--accent);
      border: 1px solid var(--accent);
      text-transform: uppercase;
      letter-spacing: 0.12em;
      white-space: nowrap;
    }

    .section-title {
      font-size: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.18em;
      color: var(--text-muted);
      margin: 8px 0 4px;
    }

    hr.soft {
      border: none;
      border-top: 1px dashed var(--border-soft);
      margin: 8px 0;
    }

    .field-group {
      display: flex;
      flex-direction: column;
      gap: 3px;
      margin-bottom: 6px;
    }

    .field-row {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 8px;
    }

    .field-row-3 {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 8px;
    }

    label {
      font-size: 0.7rem;
      color: var(--text-muted);
    }

    input[type="text"],
    input[type="number"],
    select,
    textarea {
      border-radius: 10px;
      border: 1px solid var(--input-border);
      background: var(--input-bg);
      color: var(--text-main);
      font-size: 0.8rem;
      padding: 4px 7px;
      outline: none;
      width: 100%;
      box-shadow: inset 0 0 4px rgba(255, 255, 255, 0.15);
    }

    input:focus, select:focus, textarea:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 2px var(--accent), 0 0 6px rgba(255, 46, 184, 0.5);
    }

    textarea { min-height: 42px; resize: vertical; }

    .hint { font-size: 0.7rem; color: var(--text-muted); }

    input[type="checkbox"] { margin-right: 4px; }

    button {
      font-family: inherit;
      cursor: pointer;
      border-radius: var(--radius-pill);
      border: 1px solid transparent;
      padding: 5px 11px;
      font-size: 0.8rem;
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: var(--secondary-bg);
      color: var(--secondary-text);
      border-color: var(--secondary-border);
      transition: transform 0.15s ease, box-shadow 0.15s ease;
    }
    button:hover:not(:disabled) {
      transform: translateY(-2px);
      box-shadow: 0 4px 10px rgba(255, 0, 204, 0.35), 0 0 8px rgba(0, 255, 255, 0.25);
    }
    button.primary {
      /* candy‑stripe gradient for primary actions */
      background: linear-gradient(135deg, #ff2eb8 0%, #7f00ff 50%, #00c4ff 100%);
      color: #ffffff;
      border-color: transparent;
      box-shadow: 0 2px 6px rgba(255, 0, 204, 0.4), 0 0 6px rgba(127, 0, 255, 0.3);
    }
    button.small { padding: 3px 9px; font-size: 0.72rem; }
    button.icon { padding: 3px; width: 26px; height: 26px; justify-content: center; }

    button:disabled { opacity: 0.6; cursor: default; }

    .btn-row {
      display: flex;
      justify-content: flex-end;
      gap: 8px;
      flex-wrap: wrap;
      margin-top: 4px;
    }

    #units-list {
      margin-top: 6px;
      max-height: 260px;
      overflow-y: auto;
      padding-right: 4px;
    }

    .unit-card {
      border-radius: 12px;
      border: 1px solid var(--secondary-border);
      background: var(--secondary-bg);
      padding: 6px 7px;
      margin-bottom: 6px;
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .unit-card.dragging {
      opacity: 0.5;
      border-style: dashed;
    }
    .unit-card.drag-over {
      outline: 2px dashed var(--accent);
      outline-offset: 2px;
    }

    .unit-title { font-size: 0.8rem; font-weight: 600; }
    .unit-info { font-size: 0.72rem; color: var(--text-muted); }

    .unit-card-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 5px;
    }

    /* Panel derecho / salida */
    .toolbar-right {
      display: flex;
      justify-content: flex-end;
      gap: 8px;
      align-items: center;
      margin-bottom: 6px;
      flex-wrap: wrap;
    }
    .toolbar-right span { font-size: 0.72rem; color: var(--text-muted); }

    #print-area {
      background: var(--bg-panel-soft);
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-soft);
      padding: 10px;
    }

    .print-inner {
      display: grid;
      grid-template-columns: minmax(0, 2fr) minmax(0, 1.1fr);
      gap: 10px;
      align-items: flex-start;
    }

    @media (max-width: 900px) {
      .print-inner { grid-template-columns: 1fr; }
    }

    /* Columnas: etiqueta, escala, litología, granulometría, fósiles, estructuras */
    .column-wrapper {
      display: grid;
      grid-template-columns: 60px 60px 140px 70px 70px 70px;
      gap: 5px;
      min-height: 320px;
    }

    .track {
      position: relative;
      border-radius: 12px;
      background: var(--track-bg);
      border: 1px solid var(--track-border);
      overflow: hidden;
    }
    .track-title {
      position: absolute;
      top: 3px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 0.62rem;
      text-transform: uppercase;
      letter-spacing: 0.14em;
      color: var(--text-muted);
      background: var(--track-title-bg);
      padding: 1px 6px;
      border-radius: 999px;
      white-space: nowrap;
      z-index: 2;
    }
    .track-content {
      position: absolute;
      inset: 0;
      padding-top: 16px;
    }

    /* Escala */
    .scale-line {
      position: absolute;
      left: 0;
      right: 0;
      height: 1px;
      background: var(--border-soft);
    }
    .scale-label {
      position: absolute;
      right: 3px;
      top: -7px;
      font-size: 0.62rem;
      color: var(--text-muted);
      background: var(--scale-label-bg);
      padding: 0 3px;
      border-radius: 999px;
    }

    /* Bloques litológicos */
    .litho-block {
      position: absolute;
      left: 8%;
      right: 8%;
      border-radius: 4px;
      border: 1px solid #020617;
      box-shadow: 0 0 3px rgba(0,0,0,0.4);
      background-color: var(--litho-vacio-bg);
      overflow: hidden; /* importante para recorte si añadimos background */
      display: block;
    }
    .light-mode .litho-block { border-color: #cbd5e1; }

    /* Contactos */
    .litho-block.contact-top-net { border-top-width: 2px; }
    .litho-block.contact-bottom-net { border-bottom-width: 2px; }

    .litho-block.contact-top-erosive::before,
    .litho-block.contact-bottom-erosive::after {
      content: "";
      position: absolute;
      left: -10%;
      right: -10%;
      height: 6px;
      background-image: repeating-linear-gradient(
        135deg,
        transparent 0 4px,
        var(--text-main) 4px 7px
      );
    }
    .litho-block.contact-top-erosive::before { top: -3px; }
    .litho-block.contact-bottom-erosive::after { bottom: -3px; }

    .litho-block.contact-top-wavy::before,
    .litho-block.contact-bottom-wavy::after {
      content: "";
      position: absolute;
      left: -10%;
      right: -10%;
      height: 9px;
      background-image: radial-gradient(circle at 0 50%, var(--text-main) 2px, transparent 2px);
      background-size: 10px 10px;
      background-repeat: repeat-x;
    }
    .litho-block.contact-top-wavy::before { top: -4px; }
    .litho-block.contact-bottom-wavy::after { bottom: -4px; }

    .litho-block.contact-top-grad::before,
    .litho-block.contact-bottom-grad::after {
      content: "";
      position: absolute;
      left: -5%;
      right: -5%;
      height: 8px;
      background-image: repeating-linear-gradient(
        to right,
        transparent 0 4px,
        var(--text-main) 4px 5px
      );
      opacity: 0.8;
    }
    .litho-block.contact-top-grad::before { top: -4px; }
    .litho-block.contact-bottom-grad::after { bottom: -4px; }

    /* Tramas básicas (solo para leyenda y preview) */
    .pat-lith-vacio { background-color: var(--litho-vacio-bg); }
    .pat-lith-caliza {
      background-color: #f3f4f6;
      background-image: linear-gradient(0deg, rgba(15,23,42,0.5) 1px, transparent 1px);
      background-size: 8px 6px;
    }
    .pat-lith-arenisca {
      background-color: #fde68a;
      background-image: linear-gradient(45deg, rgba(15,23,42,0.5) 1px, transparent 1px);
      background-size: 6px 6px;
    }
    .pat-lith-marga {
      background-color: #e5e7eb;
      background-image:
        linear-gradient(0deg, rgba(15,23,42,0.4) 1px, transparent 1px),
        radial-gradient(circle, rgba(15,23,42,0.3) 1px, transparent 1px);
      background-size: 8px 5px, 7px 7px;
    }
    .pat-lith-conglomerado {
      background-color: #f9fafb;
      background-image:
        radial-gradient(circle, #4b5563 2px, transparent 2px),
        radial-gradient(circle, #9ca3af 2px, transparent 2px),
        radial-gradient(circle, #111827 2px, transparent 2px);
      background-position: 0 0, 5px 6px, 11px 3px;
      background-size: 12px 12px;
    }
    .pat-lith-arcilla {
      background-color: #e0f2fe;
      background-image: radial-gradient(circle, rgba(15,23,42,0.4) 1px, transparent 1px);
      background-size: 6px 6px;
    }
    .pat-lith-limolita {
      background-color: #fee2e2;
      background-image: linear-gradient(135deg, rgba(15,23,42,0.3) 1px, transparent 1px);
      background-size: 5px 5px;
    }
    .pat-lith-dolomia {
      background-color: #fef9c3;
      background-image:
        linear-gradient(0deg, rgba(15,23,42,0.3) 1px, transparent 1px),
        linear-gradient(90deg, rgba(15,23,42,0.3) 1px, transparent 1px);
      background-size: 10px 10px;
    }
    .pat-lith-carbon {
      background-color: #111827;
      background-image: linear-gradient(45deg, rgba(249,250,251,0.15) 2px, transparent 2px);
      background-size: 5px 5px;
    }
    .pat-lith-basalto {
      background-color: #020617;
      background-image: radial-gradient(circle, rgba(148,163,184,0.4) 1px, transparent 1px);
      background-size: 6px 6px;
    }

    /* Columna de etiquetas de unidad */
    .unit-label-block {
      position: absolute;
      left: 8%;
      right: 8%;
      border-radius: 6px;
      border: 1px solid var(--border-soft);
      background: rgba(15,23,42,0.9);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 2px;
    }
    .light-mode .unit-label-block {
      background: rgba(248,250,252,0.95);
    }
    .unit-label-block span {
      font-size: 0.72rem;
      writing-mode: vertical-rl;
      text-orientation: mixed;
      text-align: center;
    }

    /* Símbolos fósiles / estructuras */
    .symbol-row {
      position: absolute;
      left: 3px;
      right: 3px;
      display: flex;
      justify-content: center;
      gap: 3px;
      flex-wrap: wrap;
      font-size: 0.75rem;
    }
    .legend-symbol {
      width: 18px;
      height: 18px;
      border-radius: 4px;
      border: 1px solid var(--secondary-border);
      background: var(--secondary-bg);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.7rem;
      overflow: hidden;
    }

    /* Granulometría */
    #granulo-svg {
      position: absolute;
      inset: 0;
    }
    .granulo-bg {
      position: absolute;
      inset: 0;
      background-image: linear-gradient(
        to right,
        var(--border-soft) 0 1px,
        transparent 1px 20px
      );
      background-size: 20px 100%;
      opacity: 0.6;
    }
    .granulo-label {
      position: absolute;
      bottom: 3px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 0.6rem;
      color: var(--text-muted);
      background: var(--scale-label-bg);
      padding: 0 4px;
      border-radius: 999px;
    }

    /* Leyenda y tabla */
    .legend-panel {
      border-radius: 14px;
      background: var(--secondary-bg);
      border: 1px solid var(--border-soft);
      padding: 8px;
      font-size: 0.74rem;
    }
    .legend-panel h3 {
      font-size: 0.85rem;
      margin-bottom: 4px;
    }

    .legend-section-title {
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.16em;
      color: var(--text-muted);
      margin: 6px 0 3px;
    }

    .legend-row {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 3px;
    }

    .legend-swatch {
      width: 32px;
      height: 14px;
      border-radius: 5px;
      border: 1px solid var(--border-soft);
      box-shadow: 0 0 2px rgba(0,0,0,0.45);
      overflow: hidden;
      position: relative;
    }
    .legend-swatch-inner {
      width: 100%;
      height: 100%;
    }

    /* Trama en blanco */
    .blank-swatch {
      background: #ffffff;
    }

    #summary-table-wrapper {
      margin-top: 8px;
      border-radius: 14px;
      background: var(--bg-panel);
      border: 1px solid var(--border-soft);
      padding: 6px;
      max-height: 260px;
      overflow: auto;
      font-size: 0.72rem;
    }

    table {
      width: 100%;
      border-collapse: collapse;
    }
    th, td {
      border: 1px solid var(--table-border);
      padding: 5px 7px;
      text-align: left;
      font-size: 0.72rem;
    }
    th {
      background: var(--table-header-bg);
      position: sticky;
      top: 0;
      z-index: 1;
    }
    tbody tr:nth-child(even) {
      background-color: var(--table-row-even-bg);
    }
    .indent-1 { padding-left: 18px; }
    .notes-cell {
      white-space: pre-wrap;
      word-break: break-word;
      min-width: 120px;
    }

    /* Leyenda manual */
    #legend-manual {
      width: 100%;
      font-size: 0.72rem;
      margin-top: 4px;
    }
    .legend-manual-hint {
      font-size: 0.68rem;
      color: var(--text-muted);
      margin-top: 2px;
    }

    /* Modo impresión (PDF) */
    .print-mode body {
      background: #ffffff;
      color: #111827;
    }
    .print-mode .panel {
      background: #ffffff;
      box-shadow: none;
      border-color: #d4d4d8;
    }
    .print-mode .toolbar-right { display: none; }
    .print-mode #summary-table-wrapper { max-height: none; }
    .print-mode .print-inner {
      display: block;
    }
    .print-mode .column-wrapper {
      grid-template-columns: 1fr 1fr 2fr 1fr 1fr 1fr;
    }
    .print-mode #legend-manual,
    .print-mode .legend-manual-hint,
    .print-mode .legend-section-title-manual,
    .print-mode .legend-section-title-blank,
    .print-mode #blank-pattern-name,
    .print-mode #blank-pattern-add {
      display: none;
    }

    /* Leyenda de contactos */
    .legend-contact-net::after {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      border-top: 2px solid var(--text-main);
    }

    .legend-contact-erosive::after {
      content: "";
      position: absolute;
      left: -10%;
      right: -10%;
      top: 50%;
      transform: translateY(-50%);
      height: 6px;
      background-image: repeating-linear-gradient(
        135deg,
        transparent 0 4px,
        var(--text-main) 4px 7px
      );
    }

    .legend-contact-wavy::after {
      content: "";
      position: absolute;
      left: -10%;
      right: -10%;
      top: 50%;
      transform: translateY(-50%);
      height: 9px;
      background-image: radial-gradient(
        circle at 0 50%,
        var(--text-main) 2px,
        transparent 2px
      );
      background-size: 10px 10px;
      background-repeat: repeat-x;
    }

    .legend-contact-grad::after {
      content: "";
      position: absolute;
      left: -5%;
      right: -5%;
      top: 50%;
      transform: translateY(-50%);
      height: 8px;
      background-image: repeating-linear-gradient(
        to right,
        transparent 0 4px,
        var(--text-main) 4px 5px
      );
      opacity: 0.8;
    }