/* geekazoid — прототип дизайна. Один файл, без зависимостей. */

:root {
  --bg:        #f6f7f9;
  --surface:   #ffffff;
  --border:    #e6e8ec;
  --text:      #1b1f24;
  --muted:     #6b7280;
  --accent:    #4f46e5;
  --accent-weak:#eef2ff;
  --green:     #16a34a;
  --amber:     #d97706;
  --red:       #dc2626;
  --radius:    10px;
  --mono:      ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans:      system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  font-size: 15px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre, .mono { font-family: var(--mono); }

/* ---------- header ---------- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.nav {
  max-width: 1080px; margin: 0 auto; padding: 0 20px;
  height: 58px; display: flex; align-items: center; gap: 28px;
}
.brand {
  font-weight: 700; font-size: 19px; letter-spacing: -0.02em;
  color: var(--text);
}
.brand .dot { color: var(--accent); }
.nav-links { display: flex; gap: 22px; flex: 1; }
.nav-links a { color: var(--muted); font-weight: 500; }
.nav-links a.active, .nav-links a:hover { color: var(--text); text-decoration: none; }
.btn-ghost {
  border: 1px solid var(--border); padding: 6px 14px; border-radius: 8px;
  color: var(--text); font-weight: 500; background: var(--surface);
}
.btn-ghost:hover { background: var(--bg); text-decoration: none; }

/* ---------- layout ---------- */
.container { max-width: 1080px; margin: 0 auto; padding: 32px 20px; }
.container-narrow { max-width: 760px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #fff; border: none; cursor: pointer;
  padding: 9px 18px; border-radius: 8px; font-weight: 600; font-size: 14px;
  font-family: var(--sans);
}
.btn:hover { background: #4338ca; text-decoration: none; }
.btn.secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn.secondary:hover { background: var(--bg); }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
}

/* ---------- hero (home) ---------- */
.hero { padding: 56px 0 36px; }
.hero h1 { font-size: 38px; letter-spacing: -0.03em; margin: 0 0 12px; }
.hero p { font-size: 17px; color: var(--muted); max-width: 560px; margin: 0 0 24px; }
.hero-actions { display: flex; gap: 12px; }

.stats { display: flex; gap: 40px; margin-top: 40px; }
.stat .num { font-size: 26px; font-weight: 700; }
.stat .lbl { color: var(--muted); font-size: 13px; }

.section-title {
  display: block;
  margin: 40px 0 16px;
}
.section-title h2 { font-size: 18px; margin: 0 0 6px; }
.section-title .section-more {
  display: block;
  text-align: right;
  font-size: 14px;
  font-weight: 500;
}

/* category chips */
.cats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.cat {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; display: block;
}
.cat:hover { border-color: var(--accent); text-decoration: none; }
.cat .name { font-weight: 600; color: var(--text); }
.cat .count { color: var(--muted); font-size: 13px; }

/* ---------- problems table ---------- */
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; align-items: center; }
.toolbar input[type=search], .toolbar select {
  padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); font-size: 14px; font-family: var(--sans); color: var(--text);
}
.toolbar input[type=search] { flex: 1; min-width: 200px; }
.toolbar .spacer { flex: 1; }

table.problems { width: 100%; border-collapse: collapse; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
table.problems th {
  text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: .04em;
  color: var(--muted); font-weight: 600; padding: 12px 16px; border-bottom: 1px solid var(--border);
}
table.problems td { padding: 13px 16px; border-bottom: 1px solid var(--border); }
table.problems tr:last-child td { border-bottom: none; }
table.problems tbody tr:hover { background: #fafbfc; }
.p-title { font-weight: 600; color: var(--text); }
.p-title:hover { color: var(--accent); }

/* badges */
.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.diff { color: #fff; }
.diff.easy   { background: var(--green); }
.diff.medium { background: var(--amber); }
.diff.hard   { background: var(--red); }
.tag { background: var(--accent-weak); color: var(--accent); margin-right: 4px; }

.status { font-size: 16px; width: 22px; display: inline-block; text-align: center; }
.status.solved   { color: var(--green); }
.status.attempt  { color: var(--amber); }
.status.none     { color: var(--border); }

/* pagination */
.pager { display: flex; gap: 6px; justify-content: center; margin-top: 22px; }
.pager a, .pager span {
  padding: 6px 12px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); color: var(--text); font-size: 14px;
}
.pager .current { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ---------- problem page ---------- */
.problem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.statement h1 { font-size: 24px; margin: 0 0 6px; letter-spacing: -0.02em; }
.meta-row { display: flex; gap: 14px; flex-wrap: wrap; color: var(--muted); font-size: 13px; margin-bottom: 20px; align-items: center; }
.problem-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 20px;
  line-height: 1.45;
}
.problem-meta-source a { color: var(--accent); }
.problem-meta-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.statement h3 { font-size: 15px; margin: 22px 0 8px; }
.statement p { margin: 0 0 12px; }
.sample {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 8px 0 4px;
}
.sample .box { border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
.sample .box header {
  font-size: 12px; color: var(--muted); padding: 6px 12px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.sample pre { margin: 0; padding: 12px; font-size: 13px; white-space: pre; overflow-x: auto; min-height: 2.75em; box-sizing: border-box; }
.copy { cursor: pointer; color: var(--accent); font-size: 12px; background: none; border: none;
  padding: 0; font-family: var(--sans); }
.copy:hover { text-decoration: underline; }

/* solve panel */
.solve { position: sticky; top: 78px; }
.solve-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.solve-head select { padding: 7px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); font-size: 14px; }
.editor {
  width: 100%; height: 280px; resize: vertical; padding: 14px;
  font-family: var(--mono); font-size: 13px; line-height: 1.5;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: #0f172a; color: #e2e8f0; tab-size: 4;
}
.solve-actions { display: flex; gap: 10px; margin: 12px 0; align-items: center; }
.solve-actions .spacer { flex: 1; }

.verdict { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.verdict-head { padding: 10px 14px; border-bottom: 1px solid var(--border); font-weight: 600; font-size: 14px; display:flex; justify-content: space-between; align-items:center; }
.verdict-overall { font-weight: 700; }
.verdict-overall.ac { color: var(--green); }
.verdict-overall.wa, .verdict-overall.tle, .verdict-overall.re { color: var(--red); }
.test-row { display: flex; align-items: center; gap: 10px; padding: 9px 14px; border-bottom: 1px solid var(--border); font-size: 13px; }
.test-row:last-child { border-bottom: none; }
.test-row .ic { width: 16px; }
.test-row .ic.ok { color: var(--green); }
.test-row .ic.bad { color: var(--red); }
.test-row .t { font-weight: 500; }
.test-row .v { margin-left: auto; color: var(--muted); font-family: var(--mono); font-size: 12px; }
.muted { color: var(--muted); }
.hint { color: var(--muted); font-size: 13px; }

/* ---------- admin ---------- */
.admin-login { max-width: 360px; margin: 80px auto; }
.admin-login .card { padding: 28px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; font-family: var(--sans); background: var(--surface); color: var(--text);
}
.admin-bar { display:flex; justify-content: space-between; align-items:center; margin-bottom: 18px; }
.form-error { background:#fef2f2; color:var(--red); border:1px solid #fecaca; padding:9px 12px; border-radius:8px; font-size:14px; margin-bottom:14px; }
.form-ok { background:#ecfdf5; color:#047857; border:1px solid #a7f3d0; padding:9px 12px; border-radius:8px; font-size:14px; margin-bottom:14px; }
.field-error { display:block; color:var(--red); font-size:12px; margin-top:4px; }
.grid-2 { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.grid-3 { display:grid; grid-template-columns:1fr 1fr 1fr; gap:12px; }
.tag-checks { display:flex; flex-wrap:wrap; gap:10px 16px; font-size:14px; }
.tag-checks label { display:flex; align-items:center; gap:5px; cursor:pointer; }
.badge.pub { background:var(--accent-weak); color:var(--accent); }
.badge.draft { background:#f3f4f6; color:var(--muted); }
.link-danger { background:none; border:none; color:var(--red); cursor:pointer; font-size:14px; padding:0; font-family:var(--sans); }
.link-danger:hover { text-decoration:underline; }
.actions { display:flex; gap:6px; align-items:center; white-space:nowrap; }
.actions form { display:inline; margin:0; }
.icon-btn {
  display:inline-flex; align-items:center; justify-content:center;
  width:32px; height:32px; padding:0; border:1px solid var(--border); border-radius:8px;
  background:var(--surface); color:var(--muted); cursor:pointer; vertical-align:middle;
  font-family:var(--sans); line-height:0;
}
a.icon-btn { color:var(--muted); }
.icon-btn:hover { color:var(--text); background:var(--bg); text-decoration:none; }
.icon-btn.danger:hover { color:var(--red); border-color:#fecaca; background:#fef2f2; }
.icon { display:block; }
.btn-sm { padding:6px 12px; font-size:13px; }
.admin-tests textarea { font-family:var(--mono); font-size:13px; width:100%; }
.admin-tests .center { text-align:center; }
.md-preview { margin-top:10px; padding:12px; border:1px solid var(--border); border-radius:8px; background:var(--bg); }
.inline-form, .cat-row { display:flex; gap:8px; align-items:center; flex-wrap:wrap; padding:10px 12px; }
.inline-form input, .cat-row input { flex:1; min-width:120px; padding:8px 10px; border:1px solid var(--border); border-radius:8px; font-size:14px; }
.bulk-import { margin-top:12px; font-size:14px; }
.bulk-import textarea { width:100%; margin:8px 0; font-family:var(--mono); font-size:13px; padding:8px; border:1px solid var(--border); border-radius:8px; }

footer.site { border-top: 1px solid var(--border); background: var(--surface); margin-top: 60px; }
footer.site .inner { max-width: 1080px; margin: 0 auto; padding: 24px 20px; color: var(--muted); font-size: 13px; display:flex; justify-content: space-between; }

/* детали упавшего теста */
.test-fail { padding: 12px 14px; border-top: 1px solid var(--border); }
.fail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  align-items: stretch;
}
.fail-cell {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  overflow: hidden;
}
.fail-cell header {
  font-size: 12px;
  color: var(--muted);
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.fail-cell pre {
  flex: 1;
  margin: 0;
  padding: 10px;
  min-height: 2.75em;
  width: 100%;
  box-sizing: border-box;
  background: var(--bg);
  border: none;
  border-radius: 0;
  font-size: 12px;
  max-height: 160px;
  overflow: auto;
  white-space: pre-wrap;
  font-family: var(--mono);
}
.fail-box pre {
  margin: 4px 0 0;
  padding: 8px;
  background: #0f172a;
  color: #e2e8f0;
  border: none;
  border-radius: 6px;
  font-size: 12px;
  max-height: 160px;
  overflow: auto;
  white-space: pre-wrap;
  font-family: var(--mono);
}

/* markdown-контент условия */
.md p { margin: 0 0 12px; }
.md ul, .md ol { padding-left: 22px; margin: 0 0 12px; }
.md pre { background: #0f172a; color: #e2e8f0; padding: 12px; border-radius: 8px; overflow-x: auto; font-size: 13px; }
.md :not(pre) > code { background: var(--accent-weak); color: var(--accent); padding: 1px 5px; border-radius: 4px; font-size: 13px; font-family: var(--mono); }
.md table { border-collapse: collapse; margin: 0 0 12px; }
.md th, .md td { border: 1px solid var(--border); padding: 4px 10px; }

@media (max-width: 820px) {
  .problem-grid, .cats { grid-template-columns: 1fr; }
  .stats { flex-wrap: wrap; gap: 24px; }
  .fail-grid { grid-template-columns: 1fr; }
}