:root {
  --bg: #ecf2f9;
  --panel: #ffffff;
  --panel-muted: #f6f9fc;
  --text: #102332;
  --text-muted: #4f6274;
  --accent: #176087;
  --accent-hover: #0f4a69;
  --accent-soft: #d7e9f4;
  --border: #d9e3ed;
  --shadow: 0 18px 42px rgba(12, 28, 41, 0.1);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 14%, rgba(23, 96, 135, 0.1), transparent 30%),
    radial-gradient(circle at 86% 12%, rgba(34, 156, 181, 0.12), transparent 32%),
    linear-gradient(180deg, #f7fafc 0%, var(--bg) 100%);
  min-height: 100vh;
}

.app-shell {
  width: min(1300px, 94vw);
  margin: 0 auto;
  padding: 32px 0 36px;
}

.hero {
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(1.7rem, 2.4vw, 2.45rem);
  line-height: 1.2;
}

.hero-copy {
  margin: 12px 0 0;
  max-width: 74ch;
  color: var(--text-muted);
  line-height: 1.55;
}

.workspace {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 22px;
}

.control-panel,
.preview-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.control-panel {
  padding: 22px 22px 18px;
}

.control-group {
  background:
    linear-gradient(180deg, #fbfdff 0%, var(--panel-muted) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 16px 14px;
  margin-bottom: 14px;
}

.control-group:last-child {
  margin-bottom: 0;
}

.panel-heading {
  margin-bottom: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: linear-gradient(120deg, #f4f9ff 0%, #fdfefe 100%);
  padding: 14px 16px;
}

.panel-heading h2 {
  margin: 0;
  font-size: 1.05rem;
}

.panel-heading p {
  margin: 6px 0 0;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.group-heading {
  margin-bottom: 12px;
}

.group-heading h3 {
  margin: 0;
  font-size: 0.98rem;
}

.group-heading p {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 0.84rem;
}

label,
.switch-row {
  display: block;
  font-size: 0.92rem;
  color: #425a70;
  font-weight: 600;
  margin-bottom: 12px;
}

label:last-child {
  margin-bottom: 0;
}

input,
select,
textarea,
button {
  font: inherit;
}

textarea,
select,
input[type="file"],
input[type="text"],
input[type="url"] {
  width: 100%;
  margin-top: 6px;
  border: 1px solid #cdd9e5;
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text);
  padding: 10px 12px;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}

textarea {
  resize: vertical;
  min-height: 94px;
}

input[type="color"] {
  width: 100%;
  height: 42px;
  margin-top: 8px;
  border: 1px solid #cdd9e5;
  border-radius: var(--radius-sm);
  padding: 4px;
  background: #fff;
}

input[type="range"] {
  display: block;
  width: 100%;
  margin-top: 8px;
  accent-color: var(--accent);
}

textarea:focus-visible,
select:focus-visible,
input[type="file"]:focus-visible,
input[type="text"]:focus-visible,
input[type="url"]:focus-visible,
input[type="color"]:focus-visible,
button:focus-visible {
  outline: none;
  border-color: #8bb8d3;
  box-shadow: 0 0 0 3px rgba(23, 96, 135, 0.14);
}

input:disabled,
select:disabled,
textarea:disabled {
  background: #eef3f8;
  color: #6d7f92;
  cursor: not-allowed;
}

.metric-value {
  display: inline-block;
  margin-top: 6px;
  color: var(--text);
  font-family: "Space Mono", monospace;
  font-size: 0.78rem;
}

.grid {
  display: grid;
  gap: 12px;
}

.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.switch-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--text);
}

.inline-field {
  display: grid;
  grid-template-columns: minmax(150px, 1fr) minmax(180px, 280px);
  align-items: center;
  gap: 12px;
}

.inline-field > span {
  font-weight: 600;
  color: #425a70;
  line-height: 1.35;
}

.inline-field select,
.inline-field input[type="color"] {
  margin-top: 0;
}

.single-line-fields {
  display: grid;
  gap: 10px;
  margin-bottom: 10px;
}

.field-note {
  margin: -2px 0 0;
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.45;
  font-weight: 500;
}

.field-note-strong {
  color: #2f475d;
}

.switch-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.is-disabled {
  opacity: 0.58;
  pointer-events: none;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  padding: 11px 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background-color 0.18s ease, transform 0.14s ease;
}

button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.secondary-button {
  background: var(--accent-soft);
  color: var(--text);
}

.secondary-button:hover {
  background: #c9dfef;
}

.preview-panel {
  position: sticky;
  top: 16px;
  align-self: start;
}

.preview-card {
  padding: 20px;
}

.preview-card h2 {
  margin: 0;
  font-size: 1.04rem;
}

.status-text {
  margin: 10px 0 12px;
  color: var(--text-muted);
  min-height: 1.4em;
  font-size: 0.9rem;
}

.qr-mount {
  min-height: 390px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed #c5d3e2;
  border-radius: var(--radius-md);
  background:
    linear-gradient(45deg, #edf4fa 25%, transparent 25%),
    linear-gradient(-45deg, #edf4fa 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #edf4fa 75%),
    linear-gradient(-45deg, transparent 75%, #edf4fa 75%);
  background-size: 16px 16px;
  background-position:
    0 0,
    0 8px,
    8px -8px,
    -8px 0px;
  padding: 18px;
  overflow: hidden;
}

.qr-mount.transparent-preview {
  background: var(--preview-bg-color, #f4f7fb);
}

.qr-mount > svg,
.qr-mount > canvas {
  max-width: 100%;
  height: auto;
}

.download-row {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 10px;
}

.download-row label {
  margin: 0;
}

@media (max-width: 1024px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    position: static;
  }
}

@media (max-width: 900px) {
  .app-shell {
    width: min(98vw, 100%);
    padding: 22px 10px 24px;
  }

  .control-panel,
  .preview-card {
    padding: 16px;
  }

  .inline-field {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .qr-mount {
    min-height: 300px;
  }
}

@media (max-width: 720px) {
  .control-panel,
  .preview-card {
    border-radius: 14px;
  }

  .two-up,
  .three-up,
  .download-row,
  .inline-field {
    grid-template-columns: 1fr;
  }

  .qr-mount {
    min-height: 240px;
    padding: 12px;
  }
}