:root {
  --bg: #06090f;
  --panel: #101723;
  --panel-soft: #161f2f;
  --text: #f5f7fc;
  --muted: #97a1b8;
  --accent: #34d8b6;
  --accent-2: #5ca3ff;
  --danger: #ff6d7d;
  --line: rgba(255, 255, 255, 0.1);
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(circle at 0% 0%, #1f2f4f 0%, rgba(31, 47, 79, 0) 55%),
    radial-gradient(circle at 100% 0%, #0d594e 0%, rgba(13, 89, 78, 0) 50%),
    var(--bg);
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1rem 3rem;
}

.app-header {
  padding: 0.75rem 0;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-size: 0.75rem;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(1.7rem, 5vw, 2.6rem);
}

.subhead {
  margin-top: 0.35rem;
  color: var(--muted);
}

.layout-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1rem;
  align-items: start;
}

.panel {
  background: linear-gradient(170deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
  backdrop-filter: blur(5px);
}

.controls-panel,
.fixture-builder {
  display: grid;
  gap: 1rem;
}

.row {
  display: flex;
  gap: 0.6rem;
  align-items: end;
}

.row-wrap {
  flex-wrap: wrap;
}

.field {
  display: grid;
  gap: 0.3rem;
  flex: 1;
  min-width: 170px;
}

.field.compact {
  flex: 0 0 220px;
}

label span,
.section-header p,
small,
.note {
  color: var(--muted);
  font-size: 0.85rem;
}

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

input,
select,
textarea {
  background: var(--panel-soft);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.7rem;
}

input[type="color"] {
  padding: 0;
  height: 44px;
  width: 100%;
}

textarea {
  resize: vertical;
}

.input-with-button {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.45rem;
}

.btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #05131f;
  border: 0;
  border-radius: 10px;
  padding: 0.6rem 0.85rem;
  font-weight: 700;
  cursor: pointer;
}

.btn.ghost {
  background: var(--panel-soft);
  color: var(--text);
  border: 1px solid var(--line);
}

.mode-card {
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem;
  display: grid;
  gap: 0.25rem;
}

.mode-card strong {
  color: var(--accent);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.toggle input {
  width: 16px;
  height: 16px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.quick-sets {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.quick-sets button {
  border-radius: 999px;
  border: 1px solid var(--line);
  padding: 0.32rem 0.55rem;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.checklist {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
  gap: 0.4rem;
}

.checklist label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 0.45rem;
}

.advanced-panel {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.55rem 0.7rem;
  background: rgba(255, 255, 255, 0.02);
}

.advanced-panel summary {
  cursor: pointer;
  font-weight: 600;
}

.chromaticity-grid {
  margin-top: 0.6rem;
  display: grid;
  gap: 0.4rem;
}

.chromaticity-row {
  display: grid;
  grid-template-columns: 1fr 90px 90px;
  gap: 0.4rem;
  align-items: center;
}

.output-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.output-panel {
  position: sticky;
  top: 0.5rem;
}

.swatches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin: 0.8rem 0 0.5rem;
}

.swatch {
  height: 72px;
  border-radius: 10px;
  border: 1px solid var(--line);
}

.table-wrap {
  margin-top: 0.7rem;
  max-height: 340px;
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 0.45rem 0.3rem;
  text-align: left;
}

td:nth-child(2) {
  font-family: var(--mono);
  font-size: 1.08rem;
  font-weight: 600;
}

.error {
  color: var(--danger);
  min-height: 1rem;
}

.hidden {
  display: none;
}

@media (max-width: 950px) {
  .layout-grid {
    grid-template-columns: 1fr;
  }

  .output-panel {
    position: sticky;
    bottom: 0;
  }

  .app-shell {
    padding-bottom: 6rem;
  }
}