:root {
  color-scheme: light;
  --bg: #eef3fb;
  --bg-deep: #dfe9f7;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: #ffffff;
  --surface-muted: #f5f8fd;
  --text: #101828;
  --muted: #667085;
  --line: rgba(148, 163, 184, 0.24);
  --primary: #2563eb;
  --primary-strong: #1d4ed8;
  --primary-soft: rgba(37, 99, 235, 0.10);
  --accent: #7c3aed;
  --success: #059669;
  --danger: #dc2626;
  --warning: #d97706;
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.10);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #07111f;
  --bg-deep: #0b1729;
  --surface: rgba(15, 23, 42, 0.80);
  --surface-strong: #111c2f;
  --surface-muted: #152238;
  --text: #f8fafc;
  --muted: #9aa8bc;
  --line: rgba(148, 163, 184, 0.18);
  --primary: #60a5fa;
  --primary-strong: #3b82f6;
  --primary-soft: rgba(96, 165, 250, 0.13);
  --accent: #a78bfa;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 8% 8%, rgba(59, 130, 246, 0.10), transparent 31%),
    radial-gradient(circle at 92% 2%, rgba(124, 58, 237, 0.11), transparent 29%),
    linear-gradient(145deg, var(--bg), var(--bg-deep));
  color: var(--text);
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  line-height: 1.55;
}

button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
.ambient {
  position: fixed;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  filter: blur(100px);
  opacity: .15;
  pointer-events: none;
  z-index: -1;
}
.ambient-one { background: #3b82f6; top: -180px; right: -120px; }
.ambient-two { background: #8b5cf6; bottom: -180px; left: -160px; }

.topbar {
  width: min(1480px, calc(100% - 36px));
  margin: 20px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 56px;
  height: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 4px;
  padding: 9px;
  border-radius: 18px;
  background: linear-gradient(145deg, #0f172a, #1e3a8a);
  box-shadow: 0 12px 28px rgba(30, 64, 175, .24);
}
.brand-mark span { border: 3px solid white; border-radius: 3px; }
.brand-mark span:nth-child(1) { grid-column: 1; grid-row: 1; }
.brand-mark span:nth-child(2) { grid-column: 3; grid-row: 1; }
.brand-mark span:nth-child(3) { grid-column: 1; grid-row: 3; }
.brand-mark span:nth-child(4) { grid-column: 3; grid-row: 3; border-width: 0; background: #60a5fa; }
.brand-mark span:nth-child(5) { grid-column: 2; grid-row: 2; border-width: 0; background: #a78bfa; border-radius: 50%; }
.brand h1 { font-size: 1.25rem; margin: 0; font-weight: 800; }
.brand p { margin: 1px 0 0; color: var(--muted); font-size: .88rem; }
.top-actions { display: flex; align-items: center; gap: 8px; }
.icon-button, .soft-button, .random-button, .mini-button, .primary-button, .secondary-button {
  border: 1px solid var(--line);
  border-radius: 12px;
  transition: .2s ease;
}
.icon-button, .soft-button, .mini-button, .secondary-button {
  color: var(--text);
  background: var(--surface);
}
.icon-button { width: 42px; height: 42px; font-size: 1.2rem; }
.soft-button { padding: 10px 14px; }
.icon-button:hover, .soft-button:hover, .mini-button:hover, .secondary-button:hover { transform: translateY(-1px); border-color: rgba(37,99,235,.35); }

.app-shell {
  width: min(1480px, calc(100% - 36px));
  margin: 22px auto 42px;
  display: grid;
  grid-template-columns: minmax(390px, 0.82fr) minmax(540px, 1.18fr);
  gap: 22px;
  align-items: start;
}
.glass-card {
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
}
.control-panel { padding: 22px; }
.preview-panel { padding: 24px; position: sticky; top: 18px; }
.panel-heading, .preview-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.eyebrow { color: var(--primary); font-size: .76rem; font-weight: 800; letter-spacing: .03em; }
h2 { margin: 2px 0 0; font-size: 1.33rem; }
.random-button {
  padding: 10px 13px;
  background: linear-gradient(135deg, var(--primary-soft), rgba(124, 58, 237, .10));
  color: var(--primary);
  font-weight: 750;
}

.settings-section {
  border: 1px solid var(--line);
  border-radius: 17px;
  background: rgba(255,255,255,.22);
  margin-top: 11px;
  overflow: hidden;
}
html[data-theme="dark"] .settings-section { background: rgba(15,23,42,.18); }
.settings-section summary {
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 780;
  list-style: none;
  cursor: pointer;
  user-select: none;
}
.settings-section summary::-webkit-details-marker { display: none; }
.settings-section summary::after { content: "+"; margin-right: auto; color: var(--muted); font-size: 1.15rem; }
.settings-section[open] summary::after { content: "−"; }
.settings-section summary span {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: .72rem;
}
.section-content { padding: 3px 16px 17px; border-top: 1px solid transparent; }
.two-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field > span, .colour-field > span { font-size: .82rem; font-weight: 700; color: var(--muted); }
.full-field { margin-bottom: 11px; }
textarea, select, input[type="text"], .colour-field input:not([type="color"]) {
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--text);
  border-radius: 11px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
textarea { resize: vertical; min-height: 82px; padding: 11px 12px; }
select { padding: 10px 11px; min-height: 43px; }
textarea:focus, select:focus, input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.field small { text-align: left; color: var(--muted); font-size: .72rem; }

.toggle-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-top: 11px; }
.toggle-row {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas: "toggle text";
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 13px;
  cursor: pointer;
}
.toggle-row input { display: none; }
.toggle-row .toggle {
  grid-area: toggle;
  width: 39px;
  height: 22px;
  border-radius: 999px;
  background: #cbd5e1;
  position: relative;
  transition: .2s;
}
.toggle-row .toggle::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  top: 3px;
  right: 3px;
  border-radius: 50%;
  background: white;
  transition: .2s;
  box-shadow: 0 2px 5px rgba(15,23,42,.25);
}
.toggle-row input:checked + .toggle { background: var(--primary); }
.toggle-row input:checked + .toggle::after { transform: translateX(-17px); }
.toggle-row > span:last-child { grid-area: text; display: flex; flex-direction: column; }
.toggle-row b { font-size: .8rem; }
.toggle-row small { color: var(--muted); font-size: .68rem; }

.colour-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.colour-field {
  display: grid;
  grid-template-columns: 39px 1fr;
  grid-template-areas: "label label" "picker text";
  gap: 6px;
}
.colour-field > span { grid-area: label; }
.colour-field input[type="color"] {
  grid-area: picker;
  width: 39px;
  height: 39px;
  border: 0;
  padding: 0;
  border-radius: 10px;
  background: transparent;
  overflow: hidden;
}
.colour-field input:not([type="color"]) { grid-area: text; min-width: 0; padding: 8px 9px; direction: ltr; text-align: center; text-transform: uppercase; }
.inline-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 12px; }
.mini-button { padding: 8px 11px; font-size: .78rem; }
.check-label { margin-right: auto; font-size: .8rem; color: var(--muted); display: flex; align-items: center; gap: 6px; }

.slider-list { display: flex; flex-direction: column; gap: 13px; }
.range-field { display: flex; flex-direction: column; gap: 6px; }
.range-field > span { display: flex; justify-content: space-between; color: var(--muted); font-size: .8rem; font-weight: 700; }
.range-field output { color: var(--primary); }
input[type="range"] { width: 100%; accent-color: var(--primary); }
.compact-sliders { margin-top: 13px; }

.logo-drop {
  min-height: 116px;
  border: 1.5px dashed rgba(37,99,235,.4);
  border-radius: 15px;
  display: grid;
  place-items: center;
  text-align: center;
  background: var(--primary-soft);
  cursor: pointer;
  padding: 13px;
  transition: .2s;
}
.logo-drop.dragging { transform: scale(.99); border-color: var(--primary); background: rgba(37,99,235,.16); }
#logoPlaceholder { display: flex; flex-direction: column; gap: 3px; }
#logoPlaceholder strong { color: var(--primary); }
#logoPlaceholder span { font-size: .72rem; color: var(--muted); }
.logo-preview-wrap { display: flex; align-items: center; gap: 12px; }
.logo-preview-wrap img { width: 66px; height: 66px; object-fit: contain; border-radius: 12px; background: white; }
.logo-preview-wrap button { border: 0; background: rgba(220,38,38,.10); color: var(--danger); border-radius: 10px; padding: 8px 11px; }

.live-toggle { display: flex; align-items: center; gap: 8px; font-size: .78rem; color: var(--muted); cursor: pointer; }
.live-toggle input { display: none; }
.live-toggle span { width: 34px; height: 19px; background: #cbd5e1; border-radius: 99px; position: relative; }
.live-toggle span::after { content: ""; position: absolute; width: 13px; height: 13px; background: white; border-radius: 50%; top: 3px; right: 3px; transition: .2s; }
.live-toggle input:checked + span { background: var(--primary); }
.live-toggle input:checked + span::after { transform: translateX(-15px); }

.preview-stage {
  position: relative;
  min-height: 510px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
}
.checkerboard {
  background-color: var(--surface-muted);
  background-image:
    linear-gradient(45deg, rgba(148,163,184,.12) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(148,163,184,.12) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(148,163,184,.12) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(148,163,184,.12) 75%);
  background-size: 26px 26px;
  background-position: 0 0, 0 13px, 13px -13px, -13px 0;
}
.preview-glow { position: absolute; width: 290px; height: 290px; border-radius: 50%; background: rgba(59,130,246,.13); filter: blur(55px); }
#qrPreview {
  position: relative;
  z-index: 1;
  display: block;
  width: min(74%, 470px);
  max-height: 470px;
  object-fit: contain;
  border-radius: 7px;
  filter: drop-shadow(0 18px 25px rgba(15,23,42,.12));
}
.loading-overlay[hidden] { display: none !important; }
.loading-overlay {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(255,255,255,.7);
  backdrop-filter: blur(6px);
}
html[data-theme="dark"] .loading-overlay { background: rgba(7,17,31,.72); }
.spinner { width: 34px; height: 34px; border: 3px solid var(--line); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.status-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin: 13px 0; }
.status-chip, .meta-chips span { border: 1px solid var(--line); border-radius: 999px; background: var(--surface-muted); color: var(--muted); font-size: .74rem; padding: 7px 10px; }
.status-chip { display: inline-flex; align-items: center; gap: 7px; }
.status-chip i { width: 8px; height: 8px; border-radius: 50%; background: #94a3b8; }
.status-chip.success { color: var(--success); border-color: rgba(5,150,105,.25); background: rgba(5,150,105,.07); }
.status-chip.success i { background: var(--success); }
.status-chip.danger { color: var(--danger); border-color: rgba(220,38,38,.24); background: rgba(220,38,38,.07); }
.status-chip.danger i { background: var(--danger); }
.meta-chips { display: flex; flex-wrap: wrap; gap: 6px; }

.warning-box { padding: 12px 14px; border: 1px solid rgba(217,119,6,.24); background: rgba(217,119,6,.07); border-radius: 14px; color: var(--warning); margin-bottom: 12px; }
.warning-box strong { font-size: .82rem; }
.warning-box ul { margin: 6px 0 0; padding-right: 18px; font-size: .76rem; }
.export-card { border: 1px solid var(--line); border-radius: 18px; padding: 14px; background: var(--surface-muted); }
.export-options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.main-actions { display: grid; grid-template-columns: 1.35fr 1fr 1fr 1fr; gap: 8px; margin-top: 12px; }
.primary-button, .secondary-button { min-height: 43px; padding: 9px 12px; font-weight: 750; }
.primary-button { border: 0; background: linear-gradient(135deg, var(--primary), var(--accent)); color: white; box-shadow: 0 9px 22px rgba(37,99,235,.2); }
.primary-button:hover { transform: translateY(-1px); filter: brightness(1.04); }
.secondary-button { background: var(--surface-strong); }
button:disabled { opacity: .55; cursor: not-allowed; transform: none !important; }
.privacy-note { text-align: center; margin: 12px 0 0; color: var(--muted); font-size: .72rem; }
.toast {
  position: fixed;
  bottom: 22px;
  left: 50%;
  transform: translate(-50%, 18px);
  padding: 11px 16px;
  border-radius: 13px;
  background: #0f172a;
  color: white;
  box-shadow: 0 14px 35px rgba(15,23,42,.28);
  opacity: 0;
  pointer-events: none;
  transition: .25s;
  z-index: 20;
  max-width: min(90vw, 560px);
  text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { background: #991b1b; }

@media (max-width: 1120px) {
  .app-shell { grid-template-columns: 1fr; }
  .preview-panel { position: static; grid-row: 1; }
  .control-panel { grid-row: 2; }
  .preview-stage { min-height: 450px; }
}
@media (max-width: 720px) {
  .topbar, .app-shell { width: min(100% - 20px, 1480px); }
  .topbar { align-items: flex-start; }
  .brand p { display: none; }
  .soft-button { display: none; }
  .control-panel, .preview-panel { padding: 15px; border-radius: 20px; }
  .panel-heading, .preview-heading { align-items: flex-start; }
  .two-columns, .toggle-grid, .colour-grid, .export-options { grid-template-columns: 1fr; }
  .main-actions { grid-template-columns: 1fr 1fr; }
  .preview-stage { min-height: 340px; }
  #qrPreview { width: min(82%, 330px); max-height: 320px; }
  .status-row { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 420px) {
  .brand-mark { width: 46px; height: 46px; border-radius: 14px; }
  .brand h1 { font-size: 1.05rem; }
  .random-button { font-size: .72rem; }
  .main-actions { grid-template-columns: 1fr; }
}