:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5d6a7e;
  --primary: #2457d6;
  --primary-dark: #183fa3;
  --border: #dce3ef;
  --danger: #b42318;
  --shadow: 0 20px 50px rgba(25, 50, 90, 0.10);
}

:root.dark {
  --bg: #0f172a;
  --surface: #172033;
  --text: #f8fafc;
  --muted: #cbd5e1;
  --primary: #7aa2ff;
  --primary-dark: #92b3ff;
  --border: #334155;
  --danger: #ff7c72;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.dark .topbar { background: rgba(15,23,42,0.88); }
.topbar__inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 24px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.logo__mark { background: var(--primary); color: #fff; padding: 8px 10px; border-radius: 12px; }
.logo__text { color: var(--text); }
.main-nav { display: flex; align-items: center; gap: 18px; color: var(--muted); }
.main-nav a:hover { color: var(--primary); }
.nav-button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 14px;
  background: var(--primary);
  color: #fff !important;
  border: 0;
  font-weight: 700;
  cursor: pointer;
}
.button:hover { background: var(--primary-dark); }
.button--ghost { background: transparent; color: var(--primary) !important; border: 1px solid var(--border); }
.button--danger { background: var(--danger); }
.theme-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.hero { padding: 72px 0 48px; }
.hero__grid { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 36px; align-items: center; }
.eyebrow { color: var(--primary); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; font-size: 12px; }
h1 { font-size: clamp(34px, 5vw, 58px); line-height: 1.1; margin: 10px 0 18px; }
h2 { font-size: 32px; line-height: 1.2; margin: 8px 0 16px; }
h3 { margin-top: 0; }
.lead { font-size: 20px; color: var(--muted); max-width: 720px; }
.hero__actions, .admin-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.hero-card, .card, .form-card, .editor, .content article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}
.hero-card { padding: 28px; }
.section { padding: 56px 0; }
.section__header { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; margin-bottom: 26px; }
.search-box { display: grid; gap: 8px; min-width: 280px; color: var(--muted); }
input, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}
.layout, .admin-grid { display: grid; grid-template-columns: 300px 1fr; gap: 24px; align-items: start; }
.sidebar { background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: 14px; position: sticky; top: 92px; }
.sidebar ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.sidebar button, .sidebar a {
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  border: 0;
  border-radius: 14px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.sidebar button:hover, .sidebar button.active { background: rgba(36, 87, 214, 0.10); color: var(--primary); }
.content { display: grid; gap: 18px; }
.content article { padding: 26px; }
.doc-list { margin: 18px 0 0; padding-left: 20px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { padding: 24px; }
.footer { background: var(--surface); border-top: 1px solid var(--border); padding: 40px 0; margin-top: 40px; }
.footer__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.admin-page { padding: 56px 0; }
.form-card { max-width: 460px; padding: 24px; display: grid; gap: 16px; }
.form-card label, .editor label { display: grid; gap: 8px; color: var(--muted); font-weight: 700; }
.form-error { color: var(--danger); min-height: 24px; }
.hidden { display: none; }
.editor { padding: 24px; display: grid; gap: 16px; }
.editor__actions { display: flex; align-items: center; gap: 14px; }
.save-status { color: var(--primary); font-weight: 700; }
.file-label { position: relative; overflow: hidden; }
.file-label input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
@media (max-width: 860px) {
  .hero__grid, .layout, .admin-grid, .footer__grid, .cards { grid-template-columns: 1fr; }
  .section__header { flex-direction: column; align-items: stretch; }
  .main-nav { gap: 10px; font-size: 14px; }
  .sidebar { position: static; }
}