:root {
  --bg: #081420;
  --panel-border: #2c4864;
  --text: #f3f7fa;
  --muted: #9eb2c4;
  --radius: 14px;
  --foundational: #655016;
  --intermediate: #1f5b47;
  --advanced: #264576;
  --expert: #7b2d2d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.bg-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 9% 16%, #164667 0%, transparent 36%),
    radial-gradient(circle at 80% 10%, #3d2c5f 0%, transparent 30%),
    radial-gradient(circle at 24% 92%, #1b4d45 0%, transparent 32%),
    linear-gradient(145deg, #07111b 0%, #0f2235 55%, #091523 100%);
}

h1,
h2,
h3,
h4 {
  font-family: "Space Grotesk", sans-serif;
}

.topbar {
  max-width: 1600px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
}

.brand-line {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 500;
}

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

.page-link {
  border: 1px solid #41729f;
  border-radius: 10px;
  background: #1a3551;
  color: #e9f4ff;
  text-decoration: none;
  padding: 7px 11px;
  font-size: 0.85rem;
  font-weight: 600;
}

.page-link.active {
  background: #285782;
}

.github-icon-link {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgb(67 101 131 / 78%);
  border-radius: 10px;
  background: rgb(15 33 49 / 72%);
  color: #b7c8d8;
  text-decoration: none;
  transition: background 130ms ease, border-color 130ms ease, color 130ms ease, transform 130ms ease;
}

.github-icon-link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.github-icon-link:hover,
.github-icon-link:focus-visible {
  background: rgb(25 50 73 / 82%);
  border-color: rgb(98 132 166 / 88%);
  color: #dbe9f7;
  transform: translateY(-1px);
}

.container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 6px 20px 32px;
}

.controls {
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  background: rgb(11 24 37 / 92%);
  padding: 12px;
  display: grid;
  grid-template-columns: 2.3fr 1fr 1fr 1.15fr;
  gap: 10px;
  align-items: end;
}

.controls label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--muted);
  font-size: 0.9rem;
}

.controls input,
.controls select {
  border: 1px solid var(--panel-border);
  border-radius: 11px;
  background: #0a1726;
  color: var(--text);
  padding: 9px 12px;
  font: inherit;
}

.toggle {
  flex-direction: row !important;
  align-items: center;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 9px 10px;
  min-height: 44px;
}

.toggle input {
  width: 18px;
  height: 18px;
  margin: 0 8px 0 0;
  accent-color: #53e3c2;
}

.actions {
  grid-column: 1 / -1;
  display: flex;
  gap: 8px;
}

.actions button {
  border: 1px solid #41729f;
  border-radius: 10px;
  background: #1a3551;
  color: #e9f4ff;
  padding: 7px 11px;
  font: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
}

.actions button:hover,
.actions button:focus-visible {
  background: #23466a;
}

.legend {
  margin-top: 10px;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  background: rgb(10 23 36 / 86%);
  padding: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.legend-chip {
  border-radius: 999px;
  border: 1px solid rgb(70 105 137 / 80%);
  padding: 4px 8px;
  font-size: 0.78rem;
  color: #d9e6f3;
  background: rgb(17 35 52 / 90%);
}

.legend-chip.level-foundational {
  background: rgb(101 80 22 / 88%);
  border-color: #806628;
}

.legend-chip.level-intermediate {
  background: rgb(31 91 71 / 88%);
  border-color: #2c7259;
}

.legend-chip.level-advanced {
  background: rgb(38 69 118 / 88%);
  border-color: #3c64a3;
}

.legend-chip.level-expert {
  background: rgb(123 45 45 / 88%);
  border-color: #944545;
}

.legend-chip.ai {
  border-color: #2ec7a4;
  box-shadow: 0 0 0 1px #2ec7a4 inset;
}

.matrix-stats {
  margin: 0 0 0 auto;
  color: var(--muted);
  font-size: 0.85rem;
}

.matrix-shell {
  margin-top: 12px;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  background: rgb(7 17 27 / 85%);
  overflow-x: auto;
}

.matrix-board {
  display: grid;
  gap: 10px;
  padding: 10px;
}

.domain-column {
  border: 1px solid rgb(63 97 129 / 90%);
  border-radius: 12px;
  background: linear-gradient(180deg, rgb(17 37 56 / 95%), rgb(11 24 36 / 95%));
  min-height: 560px;
}

.domain-column > summary {
  list-style: none;
}

.domain-column > summary::-webkit-details-marker {
  display: none;
}

.domain-body {
  display: block;
}

.domain-actions {
  display: flex;
  gap: 6px;
  padding: 8px 10px 0;
}

.domain-actions button {
  border: 1px solid #3b6489;
  border-radius: 8px;
  background: #183b5a;
  color: #dceaf7;
  padding: 4px 7px;
  font: inherit;
  font-size: 0.74rem;
  line-height: 1.2;
  cursor: pointer;
}

.domain-actions button:hover,
.domain-actions button:focus-visible {
  background: #234d74;
}

.domain-head {
  padding: 10px;
  border-bottom: 1px solid rgb(67 101 133 / 75%);
  background: rgb(21 46 70 / 88%);
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
  cursor: pointer;
}

.domain-head h2 {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.2;
  flex: 1;
}

.domain-head::before {
  content: "▸";
  color: #b9cde2;
  font-size: 0.78rem;
  transition: transform 130ms ease;
}

.domain-column[open] > .domain-head::before {
  transform: rotate(90deg);
}

.domain-count {
  font-size: 0.74rem;
  color: #d2e4f4;
  border: 1px solid rgb(88 119 149 / 78%);
  border-radius: 999px;
  padding: 3px 7px;
  white-space: nowrap;
}

.subarea-block {
  padding: 10px;
  border-bottom: 1px solid rgb(36 63 87 / 72%);
}

.subarea-block:last-child {
  border-bottom: 0;
}

.subarea-block > summary {
  list-style: none;
}

.subarea-block > summary::-webkit-details-marker {
  display: none;
}

.subarea-head {
  margin: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.subarea-block[open] > .subarea-head {
  margin-bottom: 8px;
}

.subarea-head h3 {
  margin: 0;
  font-size: 0.82rem;
  color: #ffd792;
  flex: 1;
}

.subarea-head::before {
  content: "▸";
  color: #b9cde2;
  font-size: 0.72rem;
  transition: transform 130ms ease;
}

.subarea-block[open] > .subarea-head::before {
  transform: rotate(90deg);
}

.subarea-count {
  color: #9eb2c4;
  font-size: 0.72rem;
}

.cert-list {
  display: grid;
  gap: 6px;
}

.cert-card {
  border: 1px solid #3e6690;
  border-radius: 9px;
  padding: 7px;
  text-decoration: none;
  color: #edf6fd;
  background: #254669;
}

.cert-card.level-foundational {
  border-color: #866d2a;
  background: var(--foundational);
}

.cert-card.level-intermediate {
  border-color: #2f745c;
  background: var(--intermediate);
}

.cert-card.level-advanced {
  border-color: #3d66a5;
  background: var(--advanced);
}

.cert-card.level-expert {
  border-color: #995050;
  background: var(--expert);
}

.cert-card.ai {
  box-shadow: 0 0 0 1px #2ec7a4 inset;
}

.cert-card:hover,
.cert-card:focus-visible {
  transform: translateY(-1px);
}

.cert-code {
  display: block;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.cert-name {
  display: block;
  margin-top: 2px;
  font-size: 0.79rem;
  line-height: 1.3;
}

.empty-slot {
  color: #6d8294;
  font-size: 0.76rem;
  font-style: italic;
  padding: 2px 0;
}

.empty {
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  background: rgb(10 23 36 / 86%);
  color: var(--muted);
  padding: 18px;
}

@media (max-width: 1200px) {
  .controls {
    grid-template-columns: 1fr 1fr;
  }

  .matrix-stats {
    margin-left: 0;
    width: 100%;
  }
}

@media (max-width: 740px) {
  .controls {
    grid-template-columns: 1fr;
  }
}