:root {
  --bg: #08131f;
  --bg-secondary: #0e1e2f;
  --panel: rgba(12, 28, 42, 0.88);
  --panel-border: rgba(138, 180, 216, 0.2);
  --text: #e6f0fb;
  --muted: #9eb4c9;
  --accent: #5ca8ff;
  --accent-strong: #83dbff;
  --ins: #4a90e2;
  --head: #f2a43b;
  --grid: rgba(92, 168, 255, 0.28);
  --field-bg: rgba(6, 18, 29, 0.7);
  --field-border: rgba(144, 181, 215, 0.24);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.38);
  --radius-xl: 26px;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 999px;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(93, 162, 255, 0.2), transparent 32%),
    radial-gradient(circle at bottom right, rgba(131, 219, 255, 0.16), transparent 28%),
    linear-gradient(180deg, #0c1824 0%, #08131f 100%);
  color: var(--text);
}

body {
  padding: 28px;
}

.shell {
  display: grid;
  grid-template-columns: minmax(300px, 380px) minmax(420px, 1fr);
  gap: 24px;
  min-height: calc(100vh - 56px);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.controls-panel {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.viewer-panel {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

h1,
h2 {
  margin: 0;
  font-family: "Space Grotesk", "IBM Plex Sans", sans-serif;
  line-height: 1.04;
}

h1 {
  font-size: clamp(2rem, 3vw, 2.8rem);
}

h2 {
  font-size: 1.25rem;
}

.lede,
.viewer-note,
.field-help,
.readout dt {
  color: var(--muted);
}

.lede,
.viewer-note {
  margin: 0;
  line-height: 1.6;
}

.section-header,
.viewer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.field-list {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 8px;
}

.field-label {
  font-size: 0.92rem;
  font-weight: 600;
}

.field-input-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  background: var(--field-bg);
  border: 1px solid var(--field-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.field input {
  appearance: textfield;
  border: 0;
  outline: 0;
  padding: 14px 16px;
  background: transparent;
  color: var(--text);
  font: inherit;
}

.field input::-webkit-outer-spin-button,
.field input::-webkit-inner-spin-button {
  margin: 0;
  -webkit-appearance: none;
}

.field-unit {
  padding: 0 14px;
  color: var(--accent-strong);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

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

.chip,
.ghost-button {
  border: 1px solid rgba(150, 191, 229, 0.24);
  background: rgba(12, 26, 40, 0.72);
  color: var(--text);
  font: inherit;
  cursor: pointer;
  transition:
    transform 120ms ease,
    border-color 120ms ease,
    background 120ms ease;
}

.chip {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
}

.ghost-button {
  padding: 9px 14px;
  border-radius: 10px;
}

.chip:hover,
.ghost-button:hover {
  transform: translateY(-1px);
  border-color: rgba(131, 219, 255, 0.46);
  background: rgba(16, 39, 58, 0.9);
}

.readout {
  display: grid;
  gap: 14px;
  margin: 4px 0 0;
}

.readout div {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(132, 173, 208, 0.18);
  background: rgba(7, 19, 31, 0.6);
}

.readout dt {
  margin-bottom: 6px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.readout dd {
  margin: 0;
  font-family: "IBM Plex Mono", "Consolas", monospace;
  font-size: 0.92rem;
  line-height: 1.5;
  white-space: pre-wrap;
}

.viewer-frame {
  position: relative;
  flex: 1;
  min-height: 480px;
  border-radius: 22px;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 18%, rgba(255, 255, 255, 0.08), transparent 22%),
    linear-gradient(180deg, rgba(12, 26, 39, 0.88), rgba(4, 10, 18, 1));
  border: 1px solid rgba(140, 180, 213, 0.16);
}

#alignment-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.legend {
  position: absolute;
  right: 16px;
  bottom: 16px;
  display: grid;
  gap: 10px;
  padding: 12px 14px;
  background: rgba(6, 14, 24, 0.78);
  border: 1px solid rgba(149, 186, 219, 0.18);
  border-radius: 14px;
  backdrop-filter: blur(12px);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
}

.legend-key {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.ins-key {
  background: var(--ins);
}

.head-key {
  background: var(--head);
}

@media (max-width: 980px) {
  body {
    padding: 18px;
  }

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

  .viewer-frame {
    min-height: 420px;
  }
}