:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --border: #e2e5eb;
  --text: #1a1d24;
  --text-dim: #5b616e;
  --brand: #14213d;
  --brand-2: #2a6f77;
  --accent: #2a6f77;
  --accent-contrast: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 33, 61, 0.04), 0 8px 24px rgba(20, 33, 61, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161b;
    --surface: #1c1f26;
    --border: #2c313c;
    --text: #eef0f3;
    --text-dim: #9aa1ad;
    --brand: #eef0f3;
    --brand-2: #4fb3ba;
    --accent: #4fb3ba;
    --accent-contrast: #0c1013;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

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

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---- header ---- */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.header-inner {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 20px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--brand-2), var(--brand));
  display: inline-block;
}

.brand-name {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.tagline {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* ---- layout ---- */

.app-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 24px;
  padding: 32px 20px;
  align-items: start;
}

@media (max-width: 800px) {
  .app-grid {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.preview-panel {
  position: sticky;
  top: 20px;
}

@media (max-width: 800px) {
  .preview-panel { position: static; }
}

/* ---- type tabs ---- */

.type-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 22px;
}

.type-tab {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

.type-tab:hover { border-color: var(--accent); color: var(--text); }

.type-tab.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

/* ---- forms ---- */

.type-form { display: none; }
.type-form.is-active { display: block; }

.field {
  display: block;
  margin-bottom: 14px;
}

.field-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.field input[type="text"],
.field input[type="color"],
.field select,
.field textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
}

.field input[type="color"] {
  padding: 4px;
  height: 40px;
}

.field textarea { resize: vertical; }

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.field-row-3 { grid-template-columns: 1fr 1fr 1fr; }

@media (max-width: 480px) {
  .field-row, .field-row-3 { grid-template-columns: 1fr; }
}

.field-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

/* ---- preview ---- */

.preview-stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  min-height: 280px;
}

#qr-canvas {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
}

.preview-empty {
  position: absolute;
  color: var(--text-dim);
  font-size: 0.9rem;
  text-align: center;
  margin: 0;
  padding: 0 20px;
}

/* ---- customize ---- */

.customize {
  margin-top: 18px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

.customize summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
}

.customize-body { margin-top: 14px; }

input[type="range"] { width: 100%; }

.btn-text {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0;
  margin-top: -6px;
  margin-bottom: 8px;
}

/* ---- downloads ---- */

.download-row {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.btn {
  flex: 1;
  padding: 11px 16px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

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

.privacy-note {
  margin: 16px 0 0;
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
}

/* ---- dynamic teaser ---- */

.dynamic-teaser { padding-bottom: 40px; }

.dynamic-teaser-inner { text-align: center; }
.dynamic-teaser-inner h2 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}
.dynamic-teaser-inner p {
  margin: 0;
  color: var(--text-dim);
  max-width: 640px;
  margin-inline: auto;
  font-size: 0.95rem;
}

/* ---- footer ---- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0 40px;
}

.site-footer p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.82rem;
  text-align: center;
}