:root,
:root[data-theme="dark"] {
  --bg: #0f1115;
  --bg-glow: #23262f;
  --panel: #181b22;
  --panel-2: #1f232c;
  --border: #2a2f3a;
  --text: #e8eaf0;
  --muted: #9aa2b1;
  --accent: #f5821f;
  --accent-2: #ffa94d;
  --checker-1: #20242d;
  --checker-2: #262b34;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

:root[data-theme="light"] {
  --bg: #eef1f7;
  --bg-glow: #ffffff;
  --panel: #ffffff;
  --panel-2: #f3f5fa;
  --border: #dde2ec;
  --text: #1a1d24;
  --muted: #5f6b7c;
  --accent: #ec7a12;
  --accent-2: #c96208;
  --checker-1: #e4e8f0;
  --checker-2: #eef1f7;
  --shadow: 0 8px 24px rgba(30, 40, 60, 0.12);
}

* { box-sizing: border-box; }

html { color-scheme: dark; }
html[data-theme="light"] { color-scheme: light; }

body {
  margin: 0;
  font-family: "Prompt", system-ui, -apple-system, sans-serif;
  background: radial-gradient(1200px 600px at 80% -10%, var(--bg-glow) 0%, var(--bg) 55%);
  color: var(--text);
  min-height: 100vh;
  transition: background-color .2s, color .2s;
}

/* ---------- Header ---------- */
.app-header {
  padding: 24px clamp(16px, 4vw, 48px) 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ---------- Theme toggle ---------- */
.theme-toggle {
  display: inline-flex;
  padding: 4px;
  gap: 4px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow);
}
.theme-toggle button {
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 13px;
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: .15s;
}
.theme-toggle button:hover { color: var(--text); }
.theme-toggle button.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #1a1200;
  font-weight: 600;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #1a1200;
  font-weight: 700;
  font-size: 20px;
  box-shadow: var(--shadow);
}
.brand h1 { margin: 0; font-size: clamp(20px, 3vw, 28px); }
.brand p { margin: 2px 0 0; color: var(--muted); font-size: 14px; }

/* ---------- Layout ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 20px;
  padding: 16px clamp(16px, 4vw, 48px) 32px;
  align-items: start;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .preview { order: -1; }
}

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

/* ---------- Controls ---------- */
.controls { padding: 20px; display: flex; flex-direction: column; gap: 22px; }
.group { display: flex; flex-direction: column; gap: 10px; }
.group-title {
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--muted);
}

textarea, input[type="text"], select {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  font-family: inherit;
  font-size: 14px;
  resize: vertical;
}
textarea:focus, input[type="text"]:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}
.hint { color: var(--muted); font-size: 12px; }

.field-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.grow { flex: 1; min-width: 140px; }
.field label { font-size: 13px; color: var(--muted); }

input[type="color"] {
  width: 100%;
  min-width: 64px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-2);
  cursor: pointer;
  padding: 4px;
}

input[type="range"] { width: 100%; accent-color: var(--accent); }

.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  cursor: pointer;
}
.switch-row.inline { flex: 1; min-width: 160px; }
.switch-row input[type="checkbox"] {
  width: 42px; height: 24px; appearance: none;
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 999px; position: relative; cursor: pointer; transition: background .2s;
}
.switch-row input[type="checkbox"]::after {
  content: ""; position: absolute; top: 2px; left: 2px;
  width: 18px; height: 18px; border-radius: 50%; background: var(--muted); transition: .2s;
}
.switch-row input[type="checkbox"]:checked { background: var(--accent); border-color: var(--accent); }
.switch-row input[type="checkbox"]:checked::after { left: 20px; background: #1a1200; }

.logo-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
input[type="file"] { font-size: 13px; color: var(--muted); }

/* ---------- Type selector ---------- */
.type-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.type-tab {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 13px;
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: .15s;
}
.type-tab:hover { color: var(--text); border-color: var(--accent); }
.type-tab.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #1a1200;
  border-color: transparent;
  font-weight: 600;
}
.type-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.type-fields .field { min-width: 100%; }
.type-fields .field.field-checkbox { padding-top: 2px; }
/* ให้ช่องสั้นๆ อยู่คู่กันได้ 2 คอลัมน์ */
.type-fields .field:not(:has(textarea)) { min-width: calc(50% - 6px); flex: 1; }
.type-fields .field:has(textarea) { min-width: 100%; }

/* ---------- Presets ---------- */
.preset-row { display: flex; flex-direction: column; gap: 10px; }
.presets { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 999px;
  padding: 7px 14px;
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: .15s;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Buttons ---------- */
.btn {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 10px;
  padding: 11px 16px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: .15s;
}
.btn:hover { border-color: var(--accent); }
.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #1a1200; border: none; font-weight: 600;
}
.btn.primary:hover { filter: brightness(1.05); }
.btn.ghost { background: transparent; }

/* ---------- Preview ---------- */
.preview {
  padding: 20px;
  position: sticky;
  top: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.preview-stage {
  display: grid;
  place-items: center;
  background:
    linear-gradient(45deg, var(--checker-1) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-1) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-1) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-1) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-color: var(--checker-2);
  border-radius: 12px;
  padding: 20px;
  min-height: 320px;
}
#qr-canvas { line-height: 0; }
#qr-canvas canvas, #qr-canvas svg {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

.download-row { display: flex; gap: 10px; flex-wrap: wrap; }
.download-row .btn { flex: 1; min-width: 120px; }

.filename-row { display: flex; align-items: center; gap: 10px; }
.filename-row label { color: var(--muted); font-size: 13px; white-space: nowrap; }

.status { min-height: 18px; margin: 0; font-size: 13px; color: var(--accent-2); }

/* ---------- Footer ---------- */
.app-footer {
  text-align: center;
  color: var(--muted);
  padding: 20px 16px 32px;
}
.company {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px;
  margin: 0 auto 12px;
  max-width: 560px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.company-name strong {
  display: block;
  color: var(--text);
  font-size: 15px;
}
.company-name span {
  font-size: 12px;
  letter-spacing: 0.5px;
  color: var(--muted);
}
.company-contact {
  display: flex;
  gap: 8px 14px;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  font-size: 13px;
  margin-top: 4px;
}
.company-contact > span { color: var(--muted); }
.company-contact a {
  color: var(--accent-2);
  text-decoration: none;
}
.company-contact a:hover { text-decoration: underline; }
.footer-note { font-size: 12px; }