:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #18181b;
  --muted: #71717a;
  --border: #e4e4e7;
  --card: #fafafa;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --ok: #16a34a;
  --warn: #ca8a04;
  --err: #dc2626;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0e;
    --fg: #e8e8ea;
    --muted: #a1a1aa;
    --border: #27272a;
    --card: #141418;
    --accent: #3b82f6;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

.wrap { max-width: 60rem; margin: 0 auto; padding: 1.5rem; }
.narrow { max-width: 26rem; }

header.top {
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--bg); z-index: 10;
}
header.top .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding-top: 1rem; padding-bottom: 1rem;
}
.brand { font-weight: 700; font-size: 1.125rem; text-decoration: none; color: var(--fg); }
.brand span { color: var(--muted); font-weight: 400; font-size: .875rem; }

nav { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }

h1 { font-size: 1.875rem; margin: 0 0 .5rem; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; margin: 2rem 0 .75rem; }
.lead { color: var(--muted); font-size: 1.05rem; margin: 0 0 2rem; }

.btn {
  display: inline-block; padding: .55rem 1.1rem; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--card); color: var(--fg);
  text-decoration: none; font-size: .95rem; cursor: pointer; font-family: inherit;
}
.btn:hover { border-color: var(--muted); }
.btn-primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.btn-primary:hover { opacity: .9; }
.btn-danger { color: var(--err); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-block { display: block; width: 100%; text-align: center; }

.card {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem; background: var(--card); margin-bottom: 1rem;
}

label { display: block; margin: .85rem 0 .3rem; font-size: .9rem; font-weight: 500; }
input, textarea, select {
  width: 100%; padding: .6rem .75rem; font-size: 1rem; font-family: inherit;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg); color: var(--fg);
}
input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.hint { font-size: .8rem; color: var(--muted); margin-top: .25rem; }

.msg { padding: .75rem 1rem; border-radius: var(--radius); margin: 1rem 0; font-size: .95rem; }
.msg-err { background: color-mix(in srgb, var(--err) 12%, transparent); color: var(--err); }
.msg-ok { background: color-mix(in srgb, var(--ok) 12%, transparent); color: var(--ok); }
.msg:empty { display: none; }

table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: .6rem .5rem; border-bottom: 1px solid var(--border); }
th { font-weight: 600; color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }
.table-scroll { overflow-x: auto; }

.badge {
  display: inline-block; padding: .15rem .5rem; border-radius: 999px;
  font-size: .75rem; font-weight: 600;
}
.badge-trial { background: color-mix(in srgb, var(--warn) 18%, transparent); color: var(--warn); }
.badge-active { background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); }
.badge-expired, .badge-blocked { background: color-mix(in srgb, var(--err) 18%, transparent); color: var(--err); }

.news-item { border-bottom: 1px solid var(--border); padding: 1rem 0; }
.news-item:last-child { border-bottom: none; }
.news-item h3 { margin: 0 0 .25rem; font-size: 1.05rem; }
.news-date { color: var(--muted); font-size: .8rem; }
.news-item p { margin: .5rem 0 0; white-space: pre-wrap; }

.muted { color: var(--muted); }
.center { text-align: center; }
.row { display: flex; gap: .5rem; flex-wrap: wrap; }
.stack > * + * { margin-top: .5rem; }

footer.bottom {
  border-top: 1px solid var(--border); margin-top: 3rem;
  color: var(--muted); font-size: .85rem;
}

@media (max-width: 40rem) {
  h1 { font-size: 1.5rem; }
  header.top .wrap { flex-direction: column; align-items: stretch; }
  nav { justify-content: center; }
}