:root {
  --bg: #f5f7f8;
  --panel: #ffffff;
  --ink: #152026;
  --muted: #65727c;
  --line: #d8e0e5;
  --accent: #d92332;
  --accent-dark: #941b24;
  --ok: #0f7b55;
  --warn: #9b6515;
  --radius: 8px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Arial, Helvetica, sans-serif;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button {
  border: 0;
  border-radius: var(--radius);
  background: var(--accent);
  color: white;
  padding: 0.7rem 1rem;
  font-weight: 700;
  cursor: pointer;
}
button.secondary-button {
  border: 1px solid var(--line);
  background: #eef3f6;
  color: #23313a;
}
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.7rem 0.8rem;
  background: white;
  color: var(--ink);
}
textarea { min-height: 120px; }
.auth-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}
.auth-panel {
  width: min(480px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 18px 60px rgba(21, 32, 38, 0.12);
}
.auth-logo {
  display: block;
  width: min(100%, 420px);
  height: auto;
  margin-bottom: 1rem;
}
.system-label {
  margin: 0 0 0.5rem;
  color: var(--accent-dark);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}
.muted { color: var(--muted); }
.success { color: var(--ok); font-weight: 700; }
.form-error { color: var(--accent-dark); font-weight: 700; }
.form-stack { display: grid; gap: 1rem; margin-top: 1rem; }
.form-stack label { display: grid; gap: 0.45rem; font-weight: 700; }
.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px 1fr;
}
.sidebar {
  background: #17232a;
  color: white;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.brand {
  display: grid;
  gap: 0.7rem;
  font-weight: 800;
}
.brand-logo {
  display: block;
  width: min(220px, 100%);
  height: auto;
  border-radius: 6px;
  background: white;
  padding: 0.25rem;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--accent);
}
.sidebar nav { display: grid; gap: 0.35rem; }
.sidebar nav a, .ghost-button {
  border-radius: var(--radius);
  padding: 0.7rem 0.8rem;
  color: #e8eef2;
}
.sidebar nav a:hover, .ghost-button:hover { background: rgba(255, 255, 255, 0.1); }
.user-box { margin-top: auto; display: grid; gap: 0.45rem; color: #e8eef2; }
.user-box span { color: #b8c7d0; font-size: 0.9rem; }
.main-panel { padding: 2rem; }
.page-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}
.grid { display: grid; gap: 1rem; }
.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.stats-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
}
.metric-card p { margin: 0.35rem 0 0; font-size: 2rem; font-weight: 800; }
.module-list, .stack-section { margin-top: 1.5rem; }
.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}
.section-heading h2 { margin: 0; }
.module-card {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}
.module-card h2, .admin-card h2 { margin-top: 0; }
.module-card h2 a:hover { color: var(--accent-dark); }
.card-actions, .action-row {
  display: flex;
  gap: 0.7rem;
  align-items: center;
  flex-wrap: wrap;
}
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--accent);
  color: white;
  padding: 0.7rem 1rem;
  font-weight: 700;
}
.secondary-button {
  border: 1px solid var(--line);
  background: #eef3f6;
  color: #23313a;
}
.release-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  margin-top: 1rem;
}
.list-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  margin-top: 1rem;
}
.list-row p { margin: 0.4rem 0 0; }
.exam-question {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  display: grid;
  gap: 0.75rem;
}
.exam-question h2 { margin: 0; }
.exam-answer {
  border-left: 4px solid var(--accent);
  background: #f8fafb;
  padding: 0.8rem 1rem;
  margin: 0.75rem 0;
}
.exam-answer p { margin: 0.35rem 0; }
.content-block {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  margin-top: 1rem;
}
.content-block h3 { margin: 0; }
.status-pill, .source-badge {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  border-radius: 999px;
  padding: 0.35rem 0.65rem;
  font-size: 0.82rem;
  font-weight: 700;
  background: #eef3f6;
  color: #43525c;
}
@media (max-width: 820px) {
  .app-shell { grid-template-columns: 1fr; }
  .stats-grid, .two { grid-template-columns: 1fr; }
  .main-panel { padding: 1rem; }
  .module-card, .release-row, .list-row { align-items: flex-start; flex-direction: column; }
  .brand-logo { width: min(260px, 100%); }
}