:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #0f766e;
  --accent-hover: #115e59;
  --accent-soft: #ccfbf1;
  --on-accent: #ffffff;
  --warn-bg: #fef3c7;
  --warn-text: #92400e;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .06);
  --radius: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1120;
    --surface: #111827;
    --surface-2: #1e293b;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --border: #273449;
    --accent: #2dd4bf;
    --accent-hover: #5eead4;
    --accent-soft: #134e4a;
    --on-accent: #042f2e;
    --warn-bg: #422006;
    --warn-text: #fcd34d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .3);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--accent); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }

/* Cabecera */
.topbar { background: var(--surface); border-bottom: 1px solid var(--border); }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-size: 18px; }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.lang { font: inherit; font-size: 14px; padding: 6px 8px; border-radius: 8px; }
@media (max-width: 480px) { .privacy-pill { display: none; } }
.privacy-pill { font-size: 13px; color: var(--accent); background: var(--accent-soft); padding: 4px 10px; border-radius: 999px; white-space: nowrap; }

.hero { padding: 32px 0 20px; text-align: center; }
.hero h1 { margin: 0 0 8px; font-size: clamp(24px, 4vw, 34px); line-height: 1.2; letter-spacing: -.01em; }
.hero p { margin: 0 auto; max-width: 680px; color: var(--muted); }

/* Layout principal */
.app { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 24px; align-items: start; padding-bottom: 40px; }
@media (max-width: 860px) {
  .app { grid-template-columns: minmax(0, 1fr); }
}

/* Tipos */
.types { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; margin-bottom: 14px; }
@media (max-width: 640px) { .types { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 380px) { .types { grid-template-columns: repeat(3, 1fr); } }
.types button {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 10px 4px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--surface); color: var(--text); font: inherit; font-size: 13px; cursor: pointer;
  transition: border-color .15s, background .15s;
}
.types button .ic { font-size: 20px; line-height: 1; }
.types button:hover { border-color: var(--accent); }
.types button.active { border-color: var(--accent); background: var(--accent-soft); font-weight: 600; }

/* Paneles */
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; box-shadow: var(--shadow); }
.panel summary {
  list-style: none; cursor: pointer; padding: 14px 18px; font-weight: 600; font-size: 16px;
  display: flex; align-items: center; gap: 10px; user-select: none;
}
.panel summary::-webkit-details-marker { display: none; }
.panel summary::after { content: "▾"; margin-left: auto; color: var(--muted); transition: transform .2s; }
.panel:not([open]) summary::after { transform: rotate(-90deg); }
.step {
  display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%;
  background: var(--accent); color: var(--on-accent); font-size: 13px;
}
.panel-body { padding: 4px 18px 18px; }
.panel-body h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin: 18px 0 8px; }
.panel-body h3:first-child { margin-top: 4px; }

fieldset { border: 0; margin: 0; padding: 0; }
fieldset[hidden] { display: none; }

label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 10px; }
label > input:not([type="checkbox"]), label > textarea, label > select {
  display: block; width: 100%; margin-top: 4px;
}
input[type="text"], input[type="url"], input[type="email"], input[type="tel"], input[type="number"],
input[type="datetime-local"], textarea, select {
  font: inherit; font-size: 15px; color: var(--text); background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 8px; padding: 9px 11px; min-width: 0;
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
textarea { resize: vertical; }

label.check { display: flex; align-items: center; gap: 8px; font-weight: 500; color: var(--text); font-size: 14px; cursor: pointer; }
label.check input { width: 16px; height: 16px; accent-color: var(--accent); margin: 0; }

.row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 0 12px; align-items: end; }
.row.three { grid-template-columns: 2fr 1fr 1.5fr; }
@media (max-width: 480px) { .row.three { grid-template-columns: 1fr 1fr; } }
.row .check { margin-bottom: 14px; }

.color { display: flex; align-items: center; gap: 6px; margin-top: 4px; }
.color input[type="color"] { width: 42px; height: 38px; padding: 2px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface-2); cursor: pointer; flex: none; }
.color .hex { width: 100%; text-transform: uppercase; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 14px; }

.range { display: flex; align-items: center; gap: 10px; margin-top: 6px; }
.range input { flex: 1; accent-color: var(--accent); min-width: 0; }
.range output { min-width: 48px; text-align: right; font-weight: 500; color: var(--text); font-variant-numeric: tabular-nums; }

.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; margin-bottom: 12px; }
.seg button { border: 0; background: var(--surface); color: var(--text); font: inherit; font-size: 14px; padding: 8px 12px; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--border); }
.seg button.active { background: var(--accent); color: var(--on-accent); }

.grad-only, .eye-only { display: none; }
.has-grad .grad-only { display: block; }
.has-grad.is-radial .linear-only { display: none; }
.has-eye .eye-only { display: grid; }

/* Formas */
.shapes { display: flex; flex-wrap: wrap; gap: 8px; }
.shapes button {
  width: 72px; height: 72px; padding: 4px; border: 2px solid var(--border); border-radius: 10px;
  background: #fff; cursor: pointer; display: grid; place-items: center;
}
.shapes button:hover { border-color: var(--accent); }
.shapes button.active { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.shapes button svg, .shapes button canvas { width: 100%; height: 100%; display: block; }

/* Logo */
.logo-drop {
  border: 2px dashed var(--border); border-radius: 12px; padding: 16px; text-align: center; transition: border-color .15s, background .15s;
}
.logo-drop.drag { border-color: var(--accent); background: var(--accent-soft); }
.logo-drop p { margin: 4px 0; }
.logo-preview img { max-width: 80px; max-height: 80px; border-radius: 8px; background: #fff; padding: 4px; }
.logo-presets { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.logo-presets button {
  width: 48px; height: 48px; padding: 6px; border: 2px solid var(--border); border-radius: 10px; background: #fff; cursor: pointer;
}
.logo-presets button.active { border-color: var(--accent); }
.logo-presets img { width: 100%; height: 100%; display: block; }
.sub { font-size: 13px; color: var(--muted); margin: 14px 0 6px; font-weight: 600; }

/* Botones */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: inherit; font-weight: 600; font-size: 15px; padding: 11px 16px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text); cursor: pointer;
  transition: background .15s, border-color .15s;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.btn.primary:hover { background: var(--accent-hover); }
.btn.ghost { background: transparent; }
.btn.share { border-color: var(--accent); color: var(--accent); }
.btn.small { font-size: 13px; padding: 7px 12px; margin: 4px 0 6px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

/* Salida */
.output { position: sticky; top: 16px; }
@media (max-width: 860px) { .output { position: static; } }
.output-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.preview {
  aspect-ratio: 1; width: 100%; max-width: 320px; margin: 0 auto 14px; border-radius: 12px;
  display: grid; place-items: center; overflow: hidden;
  background-color: #fff;
  background-image: linear-gradient(45deg, #e5e7eb 25%, transparent 25%), linear-gradient(-45deg, #e5e7eb 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #e5e7eb 75%), linear-gradient(-45deg, transparent 75%, #e5e7eb 75%);
  background-size: 16px 16px; background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}
.preview canvas, .preview svg { width: 100% !important; height: 100% !important; display: block; }
.downloads { display: grid; gap: 8px; }
.dl-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.size-label { margin-bottom: 14px; }

.warn { background: var(--warn-bg); color: var(--warn-text); padding: 8px 12px; border-radius: 8px; font-size: 13px; margin: 0 0 12px; }
.hint { font-size: 12px; color: var(--muted); margin: 6px 0 0; }
.hint.center { text-align: center; margin-top: 12px; }

.footer { border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; text-align: center; padding: 18px 0 28px; }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 10;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 10px; font-size: 14px; box-shadow: var(--shadow);
  max-width: calc(100% - 32px);
}