:root {
  --teal: #1a5f7a;
  --teal2: #159895;
  --ink: #0f172a;
  --muted: #64748b;
  --bg: #f1f5f9;
  --card: #ffffff;
  --line: #e2e8f0;
  --accent: #0ea5e9;
  --ok: #059669;
  --warn: #d97706;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}
a { color: var(--teal2); text-decoration: none; }
a:hover { text-decoration: underline; }
.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  background: linear-gradient(180deg, #0f3d4c 0%, var(--teal) 55%, #0b4f5c 100%);
  color: #e2e8f0;
  padding: 1.25rem 1rem 2rem;
}
.sidebar .brand {
  display: flex;
  gap: .75rem;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: .85rem;
  border-bottom: 1px solid rgba(255,255,255,.15);
}
.sidebar .brand img { width: 42px; height: 42px; border-radius: 8px; background: #fff; object-fit: contain; }
.sidebar .brand strong { display: block; color: #fff; font-size: 1.05rem; }
.sidebar .brand span { font-size: .78rem; opacity: .8; }
.sidebar nav a {
  display: block;
  color: #dbeafe;
  padding: .42rem .55rem;
  border-radius: .4rem;
  font-size: .9rem;
  margin: .12rem 0;
}
.sidebar nav a:hover, .sidebar nav a.active {
  background: rgba(255,255,255,.12);
  text-decoration: none;
  color: #fff;
}
.sidebar .nav-label {
  margin: 1rem 0 .35rem;
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  opacity: .65;
}
.main { padding: 1.5rem 1.75rem 3rem; max-width: 980px; }
.hero {
  background: linear-gradient(135deg, #fff 0%, #e0f2fe 100%);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.5rem 1.6rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .04);
}
.hero h1 { margin: 0 0 .4rem; font-size: 1.85rem; color: var(--teal); }
.hero p { margin: 0; color: var(--muted); max-width: 62ch; }
.badge {
  display: inline-block;
  background: #ccfbf1;
  color: #115e59;
  font-size: .75rem;
  font-weight: 700;
  padding: .25rem .55rem;
  border-radius: 999px;
  margin-bottom: .65rem;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: .85rem;
  margin: 1rem 0 1.5rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: .75rem;
  padding: 1rem;
}
.card h3 { margin: 0 0 .35rem; font-size: 1rem; color: var(--teal); }
.card p { margin: 0; font-size: .9rem; color: var(--muted); }
section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: .9rem;
  padding: 1.25rem 1.35rem;
  margin: 0 0 1.1rem;
}
section h2 {
  margin: 0 0 .75rem;
  font-size: 1.35rem;
  color: var(--teal);
  padding-bottom: .5rem;
  border-bottom: 2px solid #99f6e4;
}
section h3 { margin: 1.1rem 0 .4rem; font-size: 1.05rem; color: #134e4a; }
section ul, section ol { margin: .4rem 0 .8rem; padding-left: 1.25rem; }
section li { margin: .28rem 0; }
.note {
  background: #fff7ed;
  border: 1px solid #fed7aa;
  color: #9a3412;
  border-radius: .55rem;
  padding: .7rem .85rem;
  font-size: .92rem;
  margin: .75rem 0;
}
.info {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e3a8a;
  border-radius: .55rem;
  padding: .7rem .85rem;
  font-size: .92rem;
  margin: .75rem 0;
}
.ok {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
  border-radius: .55rem;
  padding: .7rem .85rem;
  font-size: .92rem;
  margin: .75rem 0;
}
.warn {
  background: #fffbeb;
  border: 1px solid #fcd34d;
  color: #92400e;
  border-radius: .55rem;
  padding: .7rem .85rem;
  font-size: .92rem;
  margin: .75rem 0;
}
.figure {
  margin: .9rem 0 1.1rem;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: .65rem;
  overflow: hidden;
}
.figure img {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  background: #fff;
}
.figure figcaption {
  padding: .55rem .75rem;
  font-size: .82rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: .65rem;
  margin: .85rem 0;
}
.gallery figure {
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: .5rem;
  overflow: hidden;
}
.gallery img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  display: block;
}
.gallery figcaption {
  font-size: .75rem;
  color: var(--muted);
  padding: .4rem .5rem;
}
.steps { counter-reset: step; list-style: none; padding: 0; }
.steps li {
  counter-increment: step;
  position: relative;
  padding: .55rem .7rem .55rem 2.6rem;
  margin: .4rem 0;
  background: #f8fafc;
  border-radius: .5rem;
  border: 1px solid var(--line);
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: .55rem;
  top: .55rem;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 50%;
  background: var(--teal2);
  color: #fff;
  font-size: .8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.kbd {
  font-family: ui-monospace, Consolas, monospace;
  background: #e2e8f0;
  padding: .1rem .35rem;
  border-radius: .3rem;
  font-size: .86em;
}
.footer-bar {
  margin-top: 1.5rem;
  padding: 1rem;
  color: var(--muted);
  font-size: .85rem;
  text-align: center;
}
.lang-switch { display: flex; gap: .4rem; margin: .75rem 0 1rem; }
.lang-switch a {
  background: rgba(255,255,255,.12);
  color: #fff !important;
  padding: .25rem .5rem;
  border-radius: .35rem;
  font-size: .8rem;
  text-decoration: none !important;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; }
}