/* CEXIA — Programa ONIA · stiluri comune */
:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --ink: #14213d;
  --muted: #5b6478;
  --accent: #2563eb;
  --accent-soft: #e0eaff;
  --sidebar-bg: #0f172a;
  --sidebar-ink: #cbd5e1;
  --sidebar-active: #1d4ed8;
  --code-bg: #0f172a;
  --code-ink: #e2e8f0;
  --border: #e2e6ef;
  --ok: #16a34a;
  --warn: #d97706;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
}

/* ---------- Layout ---------- */
.layout { display: flex; min-height: 100vh; }

main {
  flex: 1;
  max-width: 900px;
  padding: 40px 48px 80px;
  margin: 0 auto;
}

/* ---------- Sidebar ---------- */
#sidebar {
  width: 300px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  color: var(--sidebar-ink);
  padding: 24px 0 40px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
#sidebar .brand {
  display: block;
  padding: 0 20px 16px;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  border-bottom: 1px solid #1e293b;
  margin-bottom: 12px;
}
#sidebar .brand span { color: #60a5fa; }
#sidebar .chapter {
  padding: 14px 20px 4px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #7c8bb0;
  font-weight: 700;
}
#sidebar a.topic {
  display: block;
  padding: 7px 20px 7px 28px;
  color: var(--sidebar-ink);
  text-decoration: none;
  font-size: 0.9rem;
  border-left: 3px solid transparent;
}
#sidebar a.topic:hover { background: #1e293b; color: #fff; }
#sidebar a.topic.active {
  background: #172554;
  border-left-color: var(--sidebar-active);
  color: #fff;
  font-weight: 600;
}
#sidebar .foot {
  margin-top: 24px;
  padding: 16px 20px 0;
  border-top: 1px solid #1e293b;
  font-size: 0.8rem;
}
#sidebar .foot a { color: #60a5fa; text-decoration: none; display: block; padding: 3px 0; }

#menu-toggle { display: none; }

/* ---------- Conținut ---------- */
.tag {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
h1 { font-size: 2.1rem; margin: 0 0 10px; line-height: 1.2; }
.lead { font-size: 1.08rem; color: var(--muted); margin-bottom: 28px; }
h2 {
  font-size: 1.45rem;
  margin: 44px 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-soft);
}
h3 { font-size: 1.12rem; margin: 26px 0 8px; }
a { color: var(--accent); }

/* ---------- Cutii ---------- */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 16px 0;
}
.hint {
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 10px 10px 0;
  padding: 12px 18px;
  margin: 16px 0;
  font-size: 0.95rem;
}
.warn {
  border-left: 4px solid var(--warn);
  background: #fef3e2;
  border-radius: 0 10px 10px 0;
  padding: 12px 18px;
  margin: 16px 0;
  font-size: 0.95rem;
}

/* ---------- Cod ---------- */
pre {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 10px;
  padding: 16px 20px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.55;
}
code {
  font-family: "Cascadia Code", Consolas, monospace;
}
p code, li code, td code {
  background: #e8ecf5;
  color: #1e3a8a;
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 0.88em;
}

/* ---------- Tabele ---------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  background: var(--panel);
  font-size: 0.92rem;
}
th, td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
th { background: #eef2fb; }

/* ---------- Probleme ---------- */
.problema {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 14px 0;
}
.problema .titlu { font-weight: 700; font-size: 1.02rem; }
.problema .badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 999px;
  margin-left: 8px;
  vertical-align: middle;
}
.badge.usor { background: #dcfce7; color: var(--ok); }
.badge.mediu { background: #fef3c7; color: var(--warn); }
.badge.rezolvata { background: var(--accent-soft); color: var(--accent); }
.problema .links { margin-top: 8px; font-size: 0.9rem; }
.problema .links a { margin-right: 16px; }

details.solutie {
  margin-top: 12px;
  border-top: 1px dashed var(--border);
  padding-top: 10px;
}
details.solutie summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
}

/* ---------- Navigare pagină ---------- */
#pagenav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
#pagenav a {
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 0.92rem;
  max-width: 48%;
}
#pagenav a:hover { border-color: var(--accent); }
#pagenav .dir { display: block; font-size: 0.75rem; color: var(--muted); }

/* ---------- Index ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  margin: 20px 0;
}
.grid a.cell {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  text-decoration: none;
  color: var(--ink);
}
.grid a.cell:hover { border-color: var(--accent); box-shadow: 0 4px 14px rgba(37,99,235,.08); }
.grid a.cell .nr { font-size: 0.75rem; color: var(--accent); font-weight: 700; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .layout { flex-direction: column; }
  #sidebar { width: 100%; height: auto; position: static; }
  main { padding: 24px 20px 60px; }
  #menu-toggle {
    display: block;
    width: 100%;
    background: var(--sidebar-bg);
    color: #fff;
    border: none;
    padding: 12px 20px;
    font-size: 1rem;
    text-align: left;
    cursor: pointer;
  }
  #sidebar.collapsed nav { display: none; }
}