:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: #121a2e;
  --panel-2: #18223b;
  --line: #26324f;
  --ink: #e6ebf5;
  --muted: #94a1bf;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Be Vietnam Pro", ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgb(77 171 207 / 0.3); }

.wrap { max-width: 78rem; margin: 0 auto; padding: 0 1.25rem; }

/* ------------------------------ đầu trang ------------------------------ */

.top {
  border-bottom: 1px solid var(--line);
  padding: 4.5rem 0 3rem;
  background: radial-gradient(60rem 22rem at 20% -30%, rgb(77 171 207 / 0.13), transparent 70%);
}
.top h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.02em;
}
.lead {
  margin: 0;
  max-width: 46rem;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: rgb(230 235 245 / 0.85);
}

/* ------------------------------ nhóm ------------------------------ */

.group { padding: 3rem 0 0.5rem; }
.group-head { margin-bottom: 1.25rem; }
.group-head h2 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}
.group-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9375rem;
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(21rem, 1fr));
}

/* ------------------------------ thẻ ------------------------------ */

.card {
  display: block;
  padding: 1.15rem 1.25rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgb(18 26 46 / 0.6);
  text-decoration: none;
  color: inherit;
  transition: border-color 180ms, background 180ms, transform 180ms;
}
.card-link:hover {
  border-color: color-mix(in srgb, var(--c) 55%, transparent);
  background: color-mix(in srgb, var(--c) 7%, rgb(18 26 46 / 0.6));
  transform: translateY(-2px);
}
.card-off { opacity: 0.62; }

.card-head {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  margin-bottom: 0.7rem;
}
.dot {
  width: 0.7rem; height: 0.7rem;
  border-radius: 50%;
  margin-top: 0.42rem;
  flex: none;
}
.card-title {
  font-weight: 650;
  font-size: 1.0625rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.card-sub {
  color: var(--muted);
  font-size: 0.8125rem;
  margin-top: 0.1rem;
}
.count {
  margin-left: auto;
  flex: none;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.6875rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  padding: 0.15rem 0.4rem;
  white-space: nowrap;
}

.badge {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.625rem;
  font-weight: 400;
  padding: 0.1rem 0.4rem;
  border-radius: 0.35rem;
  border: 1px solid currentColor;
  white-space: nowrap;
}
.badge-soon { color: #94a1bf; }
.badge-draft { color: #f5b83d; }

.card-desc {
  margin: 0 0 0.85rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgb(230 235 245 / 0.82);
}

.tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.tag {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.6875rem;
  color: var(--muted);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  padding: 0.12rem 0.45rem;
}

/* ------------------------------ chân trang ------------------------------ */

.foot {
  margin-top: 3.5rem;
  padding: 1.5rem 1.25rem 3rem;
  border-top: 1px solid var(--line);
}
.foot p { margin: 0; color: var(--muted); font-size: 0.875rem; }

@media (max-width: 40rem) {
  .top { padding: 3rem 0 2rem; }
  .group { padding-top: 2.25rem; }
}