/* Page styling only. The signature itself uses inline styles (see app.js). */

:root {
  color-scheme: light;
  --bg: #f4f5f7;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5b6370;
  --border: #d8dce2;
  --error: #c62828;
  --accent: #009ee0; /* set from the active brand by app.js */
  --radius: 12px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

h2 {
  margin: 0 0 16px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.noscript {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
  color: var(--error);
}

/* ---- Brand toggle ---- */

.topbar {
  display: flex;
  justify-content: center;
  padding: 28px 16px 8px;
}

.brand-toggle {
  display: inline-flex;
  gap: 4px;
  margin: 0;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}

.brand-toggle input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  margin: 0;
}

.brand-toggle label {
  padding: 8px 22px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  transition: background-color 0.15s, color 0.15s;
}

.brand-toggle label:hover {
  color: var(--text);
}

.brand-toggle input:checked + label {
  background: var(--option-accent);
  color: #ffffff;
}

.brand-toggle input:focus-visible + label {
  outline: 2px solid var(--option-accent);
  outline-offset: 2px;
}

/* ---- Layout ---- */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 1fr);
  grid-template-areas:
    "preview form"
    "preview howto";
  align-items: start;
  gap: 24px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.form-panel {
  grid-area: form;
}

.preview-panel {
  grid-area: preview;
}

.howto {
  grid-area: howto;
}

.panel {
  min-width: 0;
}

@media (max-width: 800px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "form"
      "preview"
      "howto";
  }
}

/* ---- Form ---- */

.field {
  margin-bottom: 14px;
}

.field label {
  display: block;
  margin-bottom: 4px;
  font-size: 0.9rem;
  font-weight: 600;
}

.optional {
  font-weight: 400;
  color: var(--muted);
}

.field input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

.field input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 0;
  border-color: transparent;
}

.field input[aria-invalid="true"] {
  border-color: var(--error);
}

.field-error {
  min-height: 1.2em;
  margin: 4px 0 0;
  font-size: 0.8rem;
  color: var(--error);
}

/* ---- Preview ---- */

.card {
  overflow: hidden;
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

/* The signature keeps its natural width; app.js scales it down to fit. */
#signature-preview {
  width: max-content;
  transform-origin: top left;
}

.preview-note {
  margin: 8px 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

@media (max-width: 800px) {
  .card {
    padding: 16px;
  }
}

.copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

.copy-button {
  padding: 11px 22px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.copy-button:hover:not(:disabled) {
  filter: brightness(1.08);
}

.copy-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.copy-button:disabled {
  background: #b9bec6;
  cursor: not-allowed;
}

.copy-status {
  margin: 0;
  font-weight: 600;
  color: var(--text);
}

.copy-hint {
  margin: 8px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---- How-to ---- */

.howto ol {
  margin: 0;
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--muted);
}

.howto li {
  margin-bottom: 6px;
}

.howto strong {
  color: var(--text);
}

kbd {
  padding: 1px 5px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  font: 0.8em ui-monospace, monospace;
}