:root {
  --bg: #f7f7f4;
  --surface: #ffffff;
  --surface-2: #eff3ef;
  --ink: #111518;
  --muted: #66716d;
  --subtle: #8a9691;
  --line: #dfe5df;
  --accent: #126a54;
  --accent-2: #0f8a68;
  --danger: #b24030;
  --shadow: 0 18px 48px rgba(20, 30, 25, 0.10);
  --radius: 8px;
  --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d0f;
    --surface: #121619;
    --surface-2: #1a2024;
    --ink: #eef3ef;
    --muted: #a2ada8;
    --subtle: #76817d;
    --line: #283036;
    --accent: #57d3ad;
    --accent-2: #7edfc0;
    --danger: #ff806a;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
button, input, select, textarea { font: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(18px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
}

.logo-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 750;
  letter-spacing: 0.01em;
}

.logo-link img { display: block; }
.logo-link small {
  display: block;
  font-size: 10px;
  font-weight: 520;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.home-link {
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.app-shell {
  width: min(1480px, 100%);
  margin: 0 auto;
  padding: clamp(18px, 3vw, 34px);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(390px, 0.72fr);
  gap: 18px;
  align-items: start;
}

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

.controls-panel { padding: clamp(18px, 2.5vw, 28px); }
.panel-head {
  display: grid;
  gap: 4px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 11px;
  font-weight: 780;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

h1, h2, p { margin-top: 0; }
h1 {
  margin-bottom: 0;
  font-size: clamp(28px, 4.5vw, 52px);
  line-height: 1;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0;
}

.panel-head p:last-child,
.seo-section p {
  margin-bottom: 0;
  color: var(--muted);
}

.tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  padding: 5px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 14px;
}

.tab {
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  min-height: 36px;
  padding: 0 10px;
  font-weight: 720;
  cursor: pointer;
}

.tab.is-active {
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}

.content-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.hidden { display: none !important; }
.field-wide { grid-column: 1 / -1; }

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.settings-group {
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface-2) 58%, var(--surface));
}

.settings-group h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
}

.field {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

input[type="text"],
input[type="tel"],
input[type="email"],
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  padding: 10px 11px;
  outline: none;
}

textarea {
  resize: vertical;
  min-height: 96px;
  font-family: var(--mono);
  font-size: 12px;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent);
}

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

input[type="color"] {
  width: 42px;
  height: 34px;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
}

.color-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

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

.hex-input {
  width: 100%;
  min-width: 0;
  font-family: var(--mono);
  text-transform: uppercase;
}

.range-value {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 760;
}

.check-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.file-drop {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.file-drop input {
  width: 100%;
  border: 1px dashed var(--line);
  border-radius: 6px;
  padding: 10px;
  background: var(--surface);
  color: var(--muted);
}

.file-drop span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--subtle);
  font-family: var(--mono);
  font-size: 11px;
}

.text-btn {
  justify-self: start;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 0;
  font-weight: 720;
  cursor: pointer;
}

.text-btn:hover { color: var(--danger); }

.preview-panel {
  position: sticky;
  top: 76px;
  padding: 16px;
}

.preview-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: var(--surface-2);
  font-size: 12px;
  font-weight: 760;
}

.status-pill.is-error {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 35%, var(--line));
}

.canvas-stage {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(45deg, color-mix(in srgb, var(--line) 50%, transparent) 25%, transparent 25%),
    linear-gradient(-45deg, color-mix(in srgb, var(--line) 50%, transparent) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, color-mix(in srgb, var(--line) 50%, transparent) 75%),
    linear-gradient(-45deg, transparent 75%, color-mix(in srgb, var(--line) 50%, transparent) 75%);
  background-size: 18px 18px;
  background-position: 0 0, 0 9px, 9px -9px, -9px 0;
}

#qr-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.payload-preview {
  margin-top: 12px;
}

.payload-preview textarea {
  min-height: 76px;
}

.export-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 12px;
  margin-top: 12px;
}

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}

.primary-btn,
.ghost-btn {
  min-height: 44px;
  border-radius: 6px;
  border: 1px solid var(--line);
  font-weight: 800;
  cursor: pointer;
}

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

.primary-btn:hover {
  background: var(--accent-2);
  border-color: var(--accent-2);
}

.ghost-btn {
  background: var(--surface);
  color: var(--ink);
}

.ghost-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.seo-section {
  display: grid;
  grid-template-columns: 0.42fr 1fr;
  gap: clamp(18px, 4vw, 48px);
  margin-top: 18px;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.seo-section h2 {
  margin-top: 4px;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.08;
}

.seo-section p + p { margin-top: 12px; }

.site-footer {
  max-width: 1480px;
  margin: 0 auto;
  padding: 22px clamp(18px, 3vw, 34px) 34px;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  color: var(--subtle);
  font-size: 12px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

@media (max-width: 1080px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    position: static;
  }
}

@media (max-width: 720px) {
  .app-shell {
    padding: 14px;
  }

  .tabs,
  .content-form,
  .settings-grid,
  .seo-section,
  .export-row,
  .action-row {
    grid-template-columns: 1fr;
  }

  .site-header {
    padding: 0 14px;
  }

  .home-link {
    display: none;
  }

  .site-footer {
    flex-direction: column;
  }
}