:root{
    --bg: #131316;
    --bg-soft: #18181c;
    --card: #1c1c21;
    --card-border: #2a2a31;
    --text-1: #edeef2;
    --text-2: #9a9aa4;
    --text-3: #6c6c76;
    --error: #ff7a7a;
    --accent-fixed: #8b8cf6;
    --accent-1: #ff6b6b;
    --accent-2: #4d96ff;
    --radius: 14px;
    --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
    --sans: 'Inter', system-ui, -apple-system, sans-serif;
  }

  *{ box-sizing: border-box; }

  /* Safe areas: Capacitor SystemBars inyecta --safe-area-inset-* en Android
     (donde env() puede no funcionar). env() es el fallback para iOS y web. */
  html{
    padding-top: var(--safe-area-inset-top, env(safe-area-inset-top, 0px));
    padding-right: var(--safe-area-inset-right, env(safe-area-inset-right, 0px));
    padding-bottom: var(--safe-area-inset-bottom, env(safe-area-inset-bottom, 0px));
    padding-left: var(--safe-area-inset-left, env(safe-area-inset-left, 0px));
    background: var(--bg);
  }

  html, body{
    margin:0;
    padding:0;
    background: var(--bg);
    color: var(--text-1);
    font-family: var(--sans);
    -webkit-font-smoothing: antialiased;
  }

  body{
    min-height: 100vh;
    background-image:
      radial-gradient(circle at 15% 0%, rgba(139,140,246,0.07), transparent 45%),
      radial-gradient(circle at 85% 100%, rgba(77,150,255,0.06), transparent 45%);
  }

  .page{
    max-width: 760px;
    margin: 0 auto;
    padding: 32px 24px 96px;
  }

  .panel{
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 28px;
  }

  /* ---------- Picker visual (compartido) ---------- */
  .picker{
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 14px;
    height: 200px;
    margin: 0 0 24px;
  }

  .picker__solid{
    border-radius: 12px;
    border: 1px solid var(--card-border);
    background-color: #ff6b6b;
  }

  .picker__main{
    display: grid;
    grid-template-rows: 1fr 14px;
    gap: 12px;
    min-width: 0;
  }

  .picker__sv{
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    cursor: crosshair;
    touch-action: none;
    background:
      linear-gradient(to top, #000, transparent),
      linear-gradient(to right, #fff, var(--picker-hue, #ff0000));
  }

  .picker__sv-thumb,
  .picker__hue-thumb{
    position: absolute;
    border-radius: 50%;
    border: 2px solid #fff;
    transform: translate(-50%, -50%);
    pointer-events: none;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.5), 0 1px 4px rgba(0,0,0,0.4);
  }

  .picker__sv-thumb{
    width: 16px;
    height: 16px;
    left: 100%;
    top: 0%;
  }

  .picker__hue{
    position: relative;
    border-radius: 999px;
    cursor: pointer;
    touch-action: none;
    background: linear-gradient(to right,
      #f00 0%, #ff0 17%, #0f0 33%, #0ff 50%, #00f 67%, #f0f 83%, #f00 100%);
  }

  .picker__hue-thumb{
    width: 18px;
    height: 18px;
    top: 50%;
    left: 0%;
    background: var(--picker-hue, #ff0000);
  }

  /* ---------- Selector de formato ---------- */
  .format-tabs{
    display: inline-flex;
    background: var(--bg-soft);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 3px;
    margin: 0 0 22px;
  }

  .format-tab{
    background: none;
    border: none;
    color: var(--text-2);
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 7px 16px;
    border-radius: 7px;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
  }

  .format-tab.is-active{
    background: var(--card);
    color: var(--text-1);
  }

  .format-tab:hover:not(.is-active){
    color: var(--text-1);
  }

  /* ---------- Campos de color ---------- */
  .color-inputs{
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 18px;
    align-items: start;
  }

  .color-field{
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 0;
  }

  .color-field__title{
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-2);
    display: inline-flex;
    align-items: center;
    transition: color 0.15s ease;
  }

  .color-field.is-active .color-field__title{
    color: var(--text-1);
  }

  .color-field.is-active .color-field__title::before{
    content: '';
    display: inline-block;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent-fixed);
    margin-right: 8px;
  }

  .field-row{
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
  }

  .inputs-container{
    flex: 1;
    min-width: 0;
  }

  /* Input único (Hex) y subcampos comparten estética base */
  .hex-input,
  .subfield input{
    background: var(--bg-soft);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    color: var(--text-1);
    font-family: var(--mono);
    font-weight: 500;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    min-width: 0;
  }

  .hex-input{
    width: 100%;
    font-size: 15px;
    padding: 12px 14px;
    letter-spacing: 0.02em;
  }

  .hex-input:focus,
  .subfield input:focus{
    border-color: var(--accent-fixed);
    box-shadow: 0 0 0 3px rgba(139,140,246,0.18);
  }

  .hex-input.is-invalid,
  .subfield input.is-invalid{
    border-color: var(--error);
  }

  .hex-input.is-invalid:focus,
  .subfield input.is-invalid:focus{
    box-shadow: 0 0 0 3px rgba(255,122,122,0.16);
  }

  /* Subcampos RGB / HSL: tres columnas iguales con etiqueta encima */
  .subfields{
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .subfield{
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
  }

  .subfield > span{
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-3);
    text-align: center;
    letter-spacing: 0.08em;
  }

  .subfield input{
    width: 100%;
    font-size: 13px;
    padding: 10px 4px;
    text-align: center;
  }

  .swatch{
    width: 44px;
    height: 44px;
    border-radius: 10px;
    border: 1px solid var(--card-border);
    flex-shrink: 0;
    background-color: var(--bg-soft);
    cursor: pointer;
    transition: background-color 0.1s ease, transform 0.15s ease;
  }

  .swatch:hover{ transform: scale(1.05); }

  .field-error{
    min-height: 16px;
    margin: 0;
    font-size: 12px;
    color: var(--error);
    min-width: 0;
    overflow-wrap: break-word;
  }

  .divider-arrow{
    align-self: center;
    margin-top: 30px;
    color: var(--text-3);
    font-family: var(--mono);
    font-size: 18px;
  }

  /* ---------- Vista previa de gradiente ---------- */
  .gradient-preview{
    height: 14px;
    border-radius: 8px;
    margin: 24px 0;
    border: 1px solid var(--card-border);
    background: var(--bg-soft);
  }

  /* ---------- Controles inferiores ---------- */
  .controls-row{
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
    min-width: 0;
  }

  .steps-control{
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 0;
  }

  .steps-control > label{
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-2);
  }

  .stepper{
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
  }

  .step-btn{
    width: 30px;
    height: 30px;
    border-radius: 8px;
    border: 1px solid var(--card-border);
    background: var(--bg-soft);
    color: var(--text-1);
    font-size: 16px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.15s ease, color 0.15s ease;
    flex-shrink: 0;
  }

  .step-btn:hover{
    border-color: var(--accent-fixed);
    color: var(--accent-fixed);
  }

  .step-btn:focus-visible,
  input:focus-visible,
  .generate-btn:focus-visible,
  .format-tab:focus-visible,
  .swatch:focus-visible{
    outline: 2px solid var(--accent-fixed);
    outline-offset: 2px;
  }

  input[type="range"]{
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    width: auto;
    min-width: 60px;
    max-width: 140px;
    height: 4px;
    background: var(--card-border);
    border-radius: 999px;
    outline: none;
  }

  input[type="range"]::-webkit-slider-thumb{
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-fixed);
    cursor: pointer;
    border: 2px solid var(--bg);
  }

  input[type="range"]::-moz-range-thumb{
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-fixed);
    cursor: pointer;
    border: 2px solid var(--bg);
  }

  .steps-value{
    font-family: var(--mono);
    font-size: 14px;
    font-weight: 500;
    min-width: 18px;
    text-align: center;
  }

  .generate-btn{
    border: none;
    border-radius: 10px;
    padding: 13px 26px;
    font-family: var(--sans);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.02em;
    cursor: pointer;
    background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
    color: #0c0c0e;
    transition: transform 0.1s ease, filter 0.15s ease;
  }

  .generate-btn:hover{ filter: brightness(1.08); }
  .generate-btn:active{ transform: translateY(1px); }

  .actions{
    display: flex;
    gap: 10px;
    align-items: center;
  }

  .clear-btn{
    background: transparent;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 13px 22px;
    font-family: var(--sans);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--text-2);
    cursor: pointer;
    transition: border-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
  }

  .clear-btn:hover{
    border-color: var(--text-2);
    color: var(--text-1);
  }

  .clear-btn:active{ transform: translateY(1px); }

  /* ---------- Resultados ---------- */
  .results{ margin-top: 36px; }

  .results h2{
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-2);
    margin: 0 0 16px;
  }

  .results__hint{
    display: inline-block;
    margin-left: 12px;
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.02em;
    text-transform: none;
    color: var(--text-3);
  }

  .results-grid{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(86px, 1fr));
    gap: 10px;
  }

  .result-swatch,
  .harmony-swatch{
    display: flex;
    flex-direction: column;
    width: 100%;
    min-width: 0;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    background: none;
    padding: 0;
    text-align: left;
    font-family: inherit;
    animation: fadeIn 0.35s ease backwards;
  }

  .result-swatch .chip,
  .harmony-swatch .chip{
    display: block;
    width: 100%;
    height: 64px;
    flex-shrink: 0;
  }

  .result-swatch .hex-label,
  .harmony-swatch .hex-label{
    display: block;
    width: 100%;
    font-family: var(--mono);
    font-size: 11px;
    padding: 8px 6px;
    color: var(--text-2);
    background: var(--bg-soft);
    text-transform: uppercase;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    box-sizing: border-box;
  }

  .result-swatch.is-endpoint .hex-label{
    color: var(--text-1);
  }

  /* ---------- Armonías cromáticas ---------- */
  .harmonies{ margin-top: 36px; }

  .harmonies__title{
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-2);
    margin: 0 0 20px;
  }

  .harmonies__title-hex{
    font-family: var(--mono);
    color: var(--text-1);
  }

  .harmony{
    margin-bottom: 22px;
  }

  .harmony:last-child{ margin-bottom: 0; }

  .harmony__title{
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-3);
    margin: 0 0 8px;
  }

  .harmony__grid{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
    gap: 8px;
  }

  .harmony-swatch.is-base{
    border-color: var(--accent-fixed);
    box-shadow: 0 0 0 1px var(--accent-fixed);
  }

  .harmony-swatch.is-base .hex-label{
    color: var(--text-1);
  }

  .harmony-swatch .chip{
    position: relative;
  }

  .harmony-swatch.is-base .chip::after{
    content: 'base';
    position: absolute;
    top: 6px;
    right: 6px;
    font-family: var(--mono);
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #fff;
    background: rgba(0, 0, 0, 0.55);
    padding: 2px 7px;
    border-radius: 999px;
    pointer-events: none;
  }

  @keyframes fadeIn{
    from{ opacity: 0; transform: translateY(4px); }
    to{ opacity: 1; transform: translateY(0); }
  }

  /* ---------- Footer ---------- */
  .app-footer{
    margin-top: 48px;
    padding-top: 24px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    color: var(--text-3);
    text-align: center;
  }

  .app-footer a{
    color: var(--text-3);
    text-decoration: none;
    border-bottom: 1px dashed var(--card-border);
    transition: color 0.15s ease, border-color 0.15s ease;
  }

  .app-footer a:hover{
    color: var(--text-1);
    border-bottom-color: var(--text-1);
  }

  /* ---------- Toast ---------- */
  .toast{
    position: fixed;
    left: 50%;
    bottom: max(28px, calc(var(--safe-area-inset-bottom, env(safe-area-inset-bottom, 0px)) + 16px));
    transform: translateX(-50%) translateY(12px);
    background: var(--card);
    border: 1px solid var(--card-border);
    color: var(--text-1);
    font-family: var(--mono);
    font-size: 13px;
    padding: 10px 18px;
    border-radius: 999px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .toast.is-visible{
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }

  @media (prefers-reduced-motion: reduce){
    *{ animation: none !important; transition: none !important; }
  }

  /* ---------- Responsive ---------- */
  @media (max-width: 560px){
    .page{ padding: 24px 16px 80px; }
    .panel{ padding: 20px; }
    .picker{
      grid-template-columns: 60px 1fr;
      height: 160px;
      margin-bottom: 20px;
    }
    .color-inputs{ grid-template-columns: 1fr; }
    .divider-arrow{ display: none; }
    .controls-row{ align-items: stretch; }
    .actions{ width: 100%; }
    .actions .generate-btn,
    .actions .clear-btn{ flex: 1; padding-left: 0; padding-right: 0; }
    .results__hint{
      display: block;
      margin-left: 0;
      margin-top: 6px;
    }
  }