:root {
  color-scheme: dark;
  --bg: #071116;
  --panel: rgba(12, 21, 29, 0.95);
  --panel-2: #0f1d26;
  --border: rgba(255,255,255,0.08);
  --text: #f3f7fa;
  --muted: #89a3b2;
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #13212c, var(--bg) 60%);
  color: var(--text);
  min-height: 100vh;
}

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

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
  padding: 24px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 24px;
  background: rgba(7, 15, 22, 0.8);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.eyebrow {
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 0.72rem;
  color: var(--accent);
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

h1 {
  font-size: 1.75rem;
  margin-bottom: 6px;
}

.subtitle {
  color: var(--muted);
  max-width: 640px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(310px, 360px) 1fr;
  gap: 20px;
  margin-top: 20px;
}

.sidebar,
.preview-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 16px;
}

.topbar input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.button,
.link-button,
.settings-tab,
.tab,
.preview-tools button,
.chip {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.7rem 1rem;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.button:hover,
.link-button:hover,
.settings-tab:hover,
.tab:hover,
.preview-tools button:hover,
.chip:hover {
  transform: translateY(-1px);
}

.button:focus-visible,
.link-button:focus-visible,
.settings-tab:focus-visible,
.tab:focus-visible,
.preview-tools button:focus-visible,
.chip:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.button-primary {
  background: linear-gradient(135deg, var(--accent-strong), #0ea5e9);
  color: #03131b;
  font-weight: 700;
}

.button-secondary {
  background: rgba(125, 211, 252, 0.12);
  color: var(--text);
  border-color: rgba(125, 211, 252, 0.2);
}

.button-muted {
  background: rgba(255,255,255,0.06);
  color: var(--muted);
}

.source-info h3,
.controls-panel h3,
.presets-panel h3 {
  margin-bottom: 12px;
  font-size: 1rem;
}

.settings-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.settings-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  padding: 4px;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
}

.settings-tab {
  min-width: 0;
  padding: 0.58rem 0.45rem;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  white-space: nowrap;
}

.settings-tab.active {
  background: rgba(125, 211, 252, 0.16);
  color: var(--text);
  border-color: rgba(125, 211, 252, 0.32);
}

.settings-tab-panel[hidden] {
  display: none;
}

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

.source-info {
  padding: 12px 14px;
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,0.12);
}

.source-info .info-grid {
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.info-grid strong {
  display: block;
  margin-top: 4px;
  font-size: 0.95rem;
  color: var(--text);
}

.label {
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
}

.control-group span {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.95rem;
}

.control-group output {
  float: right;
  color: var(--accent);
  font-weight: 600;
}

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

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.1);
  background: var(--panel-2);
  color: var(--text);
  color-scheme: dark;
}

select option,
select optgroup {
  background: var(--panel-2);
  color: var(--text);
}

input[type="number"].value-input {
  width: 5.25rem;
  padding: 0.28rem 0.42rem;
  border-radius: 8px;
  background: rgba(125, 211, 252, 0.08);
  color: var(--accent);
  border-color: rgba(125, 211, 252, 0.18);
  font-weight: 700;
  text-align: right;
}

.checkbox-row {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.checkbox-row input {
  width: auto;
}

.section-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.link-button {
  background: transparent;
  color: var(--accent);
  padding: 0.3rem 0;
}

.preview-panel {
  padding: 18px;
}

.preview-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.segmented {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tab {
  background: rgba(255,255,255,0.06);
  color: var(--muted);
  border-color: rgba(255,255,255,0.08);
}

.tab.active {
  background: rgba(125, 211, 252, 0.16);
  color: var(--text);
  border-color: rgba(125, 211, 252, 0.35);
}

.preview-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.compact {
  margin-bottom: 0;
}

.preview-stage {
  border-radius: 18px;
  border: 1px solid var(--border);
  background: linear-gradient(145deg, rgba(255,255,255,0.02), rgba(255,255,255,0.04));
  overflow: hidden;
}

.preview-tools {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,0.18);
}

.zoom-group {
  display: flex;
  gap: 8px;
}

.preview-tools button {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border-color: rgba(255,255,255,0.1);
  padding: 0.45rem 0.7rem;
}

.status-pill {
  color: var(--accent);
  font-weight: 600;
}

.preview-viewport {
  position: relative;
  width: 100%;
  min-height: 560px;
  display: grid;
  place-items: center;
  overflow: hidden;
  background-image: linear-gradient(45deg, rgba(255,255,255,0.08) 25%, transparent 25%), linear-gradient(-45deg, rgba(255,255,255,0.08) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.08) 75%), linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.08) 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0px;
}

#previewCanvas {
  max-width: 100%;
  max-height: 100%;
  border-radius: 14px;
  box-shadow: 0 12px 20px rgba(0,0,0,0.25);
  cursor: grab;
  touch-action: none;
}

#previewCanvas.dragging {
  cursor: grabbing;
}

.three-container {
  width: 100%;
  height: 560px;
  border-radius: 14px;
  position: relative;
}

.three-controls {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  display: grid;
  gap: 8px;
  padding: 10px;
  width: min(230px, calc(100% - 24px));
  border-radius: 14px;
  background: rgba(6, 16, 24, 0.78);
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(10px);
}

.three-controls label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: var(--muted);
  font-size: 0.9rem;
}

.three-controls input[type="range"] {
  width: 100%;
}

.three-controls .checkbox-row {
  margin-bottom: 0;
}

.preview-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 14px 16px;
  color: var(--muted);
}

.preview-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.chip {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border-color: rgba(255,255,255,0.1);
  padding: 0.45rem 0.75rem;
}

.custom-size-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.custom-size-group .control-group {
  margin-bottom: 0;
}

.custom-size-group .checkbox-row {
  grid-column: 1 / -1;
}

.hidden {
  display: none;
}

.export-grid {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.help-panel {
  padding-bottom: 18px;
}

.help-toggle {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--text);
  border: none;
  padding: 0;
  font-weight: 600;
}

.help-content {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

.help-content ol {
  padding-left: 18px;
  display: grid;
  gap: 6px;
  margin: 8px 0 10px;
}

@media (max-width: 1180px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: 2;
  }
}

@media (max-width: 760px) {
  .app-shell {
    padding: 12px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .preview-viewport {
    min-height: 420px;
  }

  .three-container {
    height: 420px;
  }

  .preset-grid {
    grid-template-columns: 1fr;
  }

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