:root {
  --bg: #0b1220;
  --panel: #121c2f;
  --text: #e7eefc;
  --muted: #a9b8d6;
  --accent: #7aa2ff;
  --border: rgba(231, 238, 252, 0.14);
  --maxw: 1040px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  background: radial-gradient(1200px 600px at 20% 0%, rgba(122,162,255,0.18), transparent 60%),
              radial-gradient(900px 500px at 85% 20%, rgba(108, 234, 255, 0.14), transparent 55%),
              var(--bg);
  color: var(--text);
  line-height: 1.45;
}
a { color: var(--text); }
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 2px solid rgba(122, 162, 255, 0.75);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 100;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(18, 28, 47, 0.95);
}
.skip-link:focus { left: 12px; }
.header {
  position: sticky;
  top: 0;
  background: rgba(11, 18, 32, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 16px;
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  text-decoration: none;
}
.badge {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(122,162,255,0.9), rgba(108,234,255,0.7));
  box-shadow: 0 10px 24px rgba(0,0,0,0.25);
}
.sub {
  display: block;
  font-size: 12px;
  color: var(--muted);
}
.links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
  font-size: 14px;
}
.links a {
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
  text-decoration: none;
}
.links a:hover {
  border-color: var(--border);
  background: rgba(18, 28, 47, 0.6);
}
.links a.active {
  border-color: rgba(122,162,255,0.55);
  background: rgba(18, 28, 47, 0.8);
}
.main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 26px 16px 64px;
}
.card {
  margin-top: 14px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(18, 28, 47, 0.6);
}
.muted { color: var(--muted); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(11, 18, 32, 0.25);
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

button.btn {
  appearance: none;
  -webkit-appearance: none;
  font: inherit;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
}
.btn.primary {
  border-color: rgba(122,162,255,0.55);
  background: linear-gradient(135deg, rgba(122,162,255,0.35), rgba(108,234,255,0.18));
}
.footer {
  margin-top: 26px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

/* Home-specific helpers */
.hero {
  padding: 28px 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(18, 28, 47, 0.72);
}
.hero h1 { margin: 0 0 8px; font-size: 34px; }
.hero p { margin: 0; color: var(--muted); max-width: 70ch; }
.meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
}
.pill {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(11, 18, 32, 0.25);
}
.cta {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 14px;
  margin-top: 14px;
}
@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr; }
}
.qa {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.qa textarea {
  width: 100%;
  min-height: 84px;
  resize: vertical;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(11, 18, 32, 0.35);
  color: var(--text);
  padding: 10px 12px;
  font-size: 14px;
}

.field input {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(11, 18, 32, 0.35);
  color: var(--text);
  padding: 10px 12px;
  font-size: 14px;
}
.qa .row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.qa .answer {
  white-space: pre-wrap;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(11, 18, 32, 0.25);
  padding: 10px 12px;
  color: var(--muted);
  min-height: 46px;
}
.small { font-size: 13px; color: var(--muted); }
.warn { color: #ffd2a6; }

.status-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

@media (max-width: 720px) {
  .status-grid { grid-template-columns: 1fr; }
}

.status-item {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px 12px;
  background: rgba(11, 18, 32, 0.25);
}

.status-value {
  margin-top: 4px;
  font-weight: 700;
  color: var(--text);
}

.status-value.ok {
  color: #b8f7d0;
}

.status-value.warn {
  color: #ffd2a6;
}

.img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(11, 18, 32, 0.25);
}

.img + .small,
.img + .muted {
  margin-top: 8px;
}

/* Members winners/use cases */
.years-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.winners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.year {
  padding-top: 6px;
  border-top: 1px solid var(--border);
}

.year:first-child {
  border-top: none;
}

.year-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.challenge-section {
  margin: 14px 0;
  padding: 12px;
  border: 1px solid rgba(78, 162, 253, 0.3);
  border-radius: 12px;
  background: rgba(78, 162, 253, 0.05);
}

.challenge-section > summary {
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  color: #4ea2fd;
}

.challenge-section > summary::-webkit-details-marker {
  display: none;
}

.challenge-topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.challenge-topic {
  padding: 10px 12px;
  border-left: 3px solid #4ea2fd;
  background: rgba(11, 18, 32, 0.3);
  border-radius: 6px;
}

.challenge-topic h4 {
  margin: 0 0 6px;
  font-size: 14px;
  color: #e1e8f0;
}

.topic-code {
  display: inline-block;
  padding: 2px 6px;
  background: rgba(78, 162, 253, 0.2);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  color: #4ea2fd;
  margin-right: 6px;
}

.challenge-topic p {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
}

.columns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.category-col {
  flex: 1 1 280px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(11, 18, 32, 0.18);
  padding: 14px;
}

.category-col h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.usecase {
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 12px;
}

.usecase:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.usecase h4 {
  margin: 0 0 6px;
  font-size: 15px;
}

.usecase p {
  margin: 8px 0 0;
}

.usecase-award {
  margin: 6px 0;
  padding: 8px 12px;
  background: rgba(122, 162, 255, 0.12);
  border-left: 3px solid rgba(122, 162, 255, 0.6);
  border-radius: 6px;
  font-size: 14px;
}

.usecase-award strong {
  color: var(--accent);
}

.usecase-meta {
  font-size: 13px;
  color: var(--muted);
}

.usecase-team {
  margin: 4px 0;
}

.usecase-people {
  margin-top: 0;
  line-height: 1.7;
}

.usecase-people > div {
  margin: 6px 0;
}

.usecase-links {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
}

.usecase-details {
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(11, 18, 32, 0.22);
  padding: 10px 12px;
}

.usecase-details > summary {
  cursor: pointer;
  user-select: none;
  font-weight: 600;
  color: var(--text);
}

.usecase-dl {
  margin: 10px 0 0;
}

.usecase-dl dt {
  margin-top: 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
}

.usecase-dl dt:first-child {
  margin-top: 0;
}

.usecase-dl dd {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.usecase-people {
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.usecase-people > div {
  margin-top: 8px;
}

.usecase-people > div:first-child {
  margin-top: 0;
}