:root {
  --bg: #f4f0e8;
  --bg-alt: #e8dfd2;
  --panel: rgba(255, 250, 242, 0.82);
  --panel-border: rgba(71, 52, 28, 0.15);
  --text: #1d1a16;
  --muted: #65584a;
  --accent: #b55d2d;
  --accent-strong: #8b3c13;
  --accent-soft: #f2d7c5;
  --success: #256245;
  --warning: #a24f2a;
  --shadow: 0 22px 45px rgba(57, 40, 19, 0.12);
  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --rack-unit-height: 38px;
  --font-display: "Avenir Next", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.75), transparent 26%),
    linear-gradient(160deg, var(--bg) 0%, #eadfce 52%, #efe7dc 100%);
  color: var(--text);
  font-family: var(--font-body);
}

button, input, select {
  font: inherit;
}

.app-shell {
  max-width: 1600px;
  margin: 0 auto;
  padding: 32px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(260px, 0.9fr);
  gap: 24px;
  margin-bottom: 24px;
}

.hero__copy,
.hero__meta,
.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero__copy {
  padding: 36px;
  border-radius: var(--radius-lg);
}

.hero__copy h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.8rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.eyebrow {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.82rem;
  color: var(--accent-strong);
}

.hero__lead {
  max-width: 60ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero__meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 24px;
  border-radius: var(--radius-lg);
}

.meta-card {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.5);
}

.meta-card__label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(420px, 1fr) minmax(320px, 390px);
  gap: 24px;
  align-items: start;
}

.panel {
  padding: 24px;
  border-radius: var(--radius-lg);
}

.panel__heading h2,
.subpanel__header h3 {
  margin: 0;
  font-family: var(--font-display);
}

.panel__heading p {
  margin: 6px 0 0;
  color: var(--muted);
}

.panel--controls,
.panel--sidebar {
  display: grid;
  gap: 18px;
}

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

.field span {
  font-size: 0.9rem;
  color: var(--muted);
}

.field input,
.field select,
.subpanel__header button {
  border: 1px solid rgba(83, 58, 31, 0.14);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.82);
  padding: 12px 14px;
}

.field input:focus,
.field select:focus {
  outline: 2px solid rgba(181, 93, 45, 0.24);
  outline-offset: 1px;
}

.library-toolbar {
  display: grid;
  gap: 14px;
}

.library {
  display: grid;
  gap: 12px;
  max-height: 780px;
  overflow: auto;
  padding-right: 4px;
}

.component-card,
.rack-item,
.subpanel,
.notice {
  border: 1px solid rgba(75, 57, 37, 0.12);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.68);
}

.component-card {
  padding: 14px;
  display: grid;
  gap: 10px;
}

.component-card__header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}

.component-card__header strong {
  display: block;
}

.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  padding: 5px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 700;
}

.component-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 0.84rem;
}

.component-card button,
.subpanel__header button,
.rack-item button {
  cursor: pointer;
  border: 0;
  background: var(--accent);
  color: #fff;
  border-radius: 12px;
  padding: 10px 12px;
}

.component-card button:hover,
.subpanel__header button:hover,
.rack-item button:hover {
  background: var(--accent-strong);
}

.rack-stage {
  display: grid;
  gap: 18px;
}

.rack-summary,
.stat-grid {
  display: grid;
  gap: 12px;
}

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

.summary-card,
.stat-card {
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(75, 57, 37, 0.12);
}

.summary-card strong,
.stat-card strong {
  display: block;
  margin-top: 6px;
  font-size: 1.1rem;
}

.rack-grid {
  position: relative;
  border-radius: 28px;
  border: 2px solid rgba(77, 50, 21, 0.4);
  background:
    linear-gradient(90deg, rgba(98, 71, 45, 0.18), rgba(255, 255, 255, 0) 14%, rgba(255, 255, 255, 0) 86%, rgba(98, 71, 45, 0.18)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.42), rgba(218, 197, 174, 0.36));
  padding: 24px 38px 24px 74px;
  overflow: hidden;
}

.rack-grid::before,
.rack-grid::after {
  content: "";
  position: absolute;
  top: 18px;
  bottom: 18px;
  width: 12px;
  border-radius: 999px;
  background: rgba(92, 65, 37, 0.42);
}

.rack-grid::before {
  left: 26px;
}

.rack-grid::after {
  right: 26px;
}

.rack-slot {
  position: relative;
  height: var(--rack-unit-height);
  border-top: 1px dashed rgba(89, 60, 31, 0.25);
}

.rack-slot:first-child {
  border-top: 0;
}

.rack-slot.is-drop-target {
  background: rgba(181, 93, 45, 0.11);
}

.rack-slot__label {
  position: absolute;
  left: -52px;
  top: 8px;
  font-size: 0.76rem;
  color: var(--muted);
}

.rack-items-layer {
  position: absolute;
  inset: 24px 38px 24px 74px;
}

.rack-item {
  position: absolute;
  left: 0;
  right: 0;
  padding: 12px 12px 12px 14px;
  display: grid;
  gap: 8px;
  border-left: 8px solid var(--accent);
  user-select: none;
}

.rack-item[data-standard="10_inch"] {
  right: 16%;
}

.rack-item.is-dragging {
  opacity: 0.6;
}

.rack-item__header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}

.rack-item__meta,
.list-output,
.notes {
  color: var(--muted);
  font-size: 0.9rem;
}

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

.rack-item__actions button {
  padding: 8px 10px;
  font-size: 0.84rem;
}

.subpanel {
  padding: 16px;
  display: grid;
  gap: 12px;
}

.subpanel__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

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

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

.list-output {
  display: grid;
  gap: 10px;
}

.bom-line {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.64);
}

.notice {
  padding: 12px 14px;
}

.notes {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.notes li.ok {
  color: var(--success);
}

.notes li.warn {
  color: var(--warning);
}

.empty-state {
  padding: 20px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed rgba(75, 57, 37, 0.2);
  border-radius: var(--radius-md);
}

@media (max-width: 1280px) {
  .workspace {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 720px) {
  .app-shell {
    padding: 18px;
  }

  .rack-summary,
  .stat-grid,
  .field-row {
    grid-template-columns: 1fr;
  }

  .rack-grid {
    padding-left: 62px;
    padding-right: 26px;
  }

  .rack-items-layer {
    inset: 24px 26px 24px 62px;
  }
}