:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-code: #1e2430;
  --text: #1c2333;
  --text-soft: #55607a;
  --brand: #c8102e;
  --brand-dark: #9c0c24;
  --accent: #f5a623;
  --border: #e3e6ee;
  --link: #b30d28;
  --ok: #1a7f4b;
  --warn-bg: #fff7e6;
  --warn-border: #f5c66b;
  --info-bg: #eef4ff;
  --info-border: #9db9f0;
  --danger-bg: #fdeef0;
  --danger-border: #f0a3ad;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 16px;
  background: var(--brand);
  color: #fff;
  padding: 0 20px;
  height: 56px;
  box-shadow: 0 1px 4px rgba(0,0,0,.2);
}
.brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 17px; white-space: nowrap; }
.brand span { font-weight: 400; opacity: .85; }
.topnav { margin-left: auto; display: flex; gap: 4px; }
.topnav a {
  color: rgba(255,255,255,.9); text-decoration: none; font-size: 14px;
  padding: 6px 12px; border-radius: 6px;
}
.topnav a:hover { background: rgba(255,255,255,.15); color: #fff; }
.nav-toggle {
  display: none; background: none; border: none; color: #fff;
  font-size: 22px; cursor: pointer; padding: 4px 8px;
}

/* Layout */
.shell { display: flex; max-width: 1400px; margin: 0 auto; }
.sidebar {
  width: 270px; flex-shrink: 0;
  padding: 24px 16px 60px 8px;
  border-right: 1px solid var(--border);
  height: calc(100vh - 56px);
  position: sticky; top: 56px;
  overflow-y: auto;
  background: var(--bg-soft);
}
.side-section { margin-bottom: 18px; }
.side-section h4 {
  margin: 0 0 6px; font-size: 12px; text-transform: uppercase;
  letter-spacing: .08em; color: var(--text-soft); padding-left: 10px;
}
.side-section ul { list-style: none; margin: 0; padding: 0; }
.side-section li a {
  display: block; padding: 5px 10px; border-radius: 6px;
  color: var(--text); text-decoration: none; font-size: 14px;
  border-left: 3px solid transparent;
}
.side-section li a:hover { background: #eceef4; }
.side-section li a.active {
  background: #fbe9ec; color: var(--brand-dark);
  border-left-color: var(--brand); font-weight: 600;
}
.side-home {
  display: block; padding: 5px 10px; border-radius: 6px;
  color: var(--text); text-decoration: none; font-size: 15px; font-weight: 600;
}
.side-home.active { background: #fbe9ec; color: var(--brand-dark); }

.content {
  flex: 1; min-width: 0;
  padding: 28px 44px 60px;
  max-width: 980px;
}
.breadcrumb { font-size: 13px; color: var(--text-soft); margin-bottom: 18px; }
.breadcrumb a { color: var(--link); text-decoration: none; }
.breadcrumb span { margin: 0 6px; color: #b9bfd0; }

/* Typography */
h1 { font-size: 30px; margin: 0 0 18px; padding-bottom: 12px; border-bottom: 2px solid var(--brand); line-height: 1.25; }
h2 { font-size: 22px; margin: 38px 0 12px; }
h3 { font-size: 17px; margin: 28px 0 10px; }
h4 { font-size: 15px; margin: 20px 0 8px; }
p { margin: 10px 0; }
a { color: var(--link); }
ul, ol { padding-left: 24px; }
li { margin: 4px 0; }
strong { color: #111827; }
hr { border: none; border-top: 1px solid var(--border); margin: 30px 0; }

/* Tables */
table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: 14px; }
th, td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; vertical-align: top; }
th { background: var(--bg-soft); font-weight: 600; }
tr:nth-child(even) td { background: #fafbfd; }
td code, p code, li code {
  background: #eef0f6; color: #a1102a;
  padding: 1px 6px; border-radius: 4px; font-size: 13px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

/* Code blocks */
pre {
  background: var(--bg-code); color: #e6e9f2;
  padding: 16px 18px; border-radius: 8px;
  overflow-x: auto; font-size: 13px; line-height: 1.55;
}
pre code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; }

/* Callouts */
.note, .warning, .tip, .danger {
  border-radius: 8px; padding: 12px 16px; margin: 16px 0; font-size: 14.5px;
}
.note { background: var(--info-bg); border-left: 4px solid var(--info-border); }
.tip { background: #eafaf1; border-left: 4px solid var(--ok); }
.warning { background: var(--warn-bg); border-left: 4px solid var(--warn-border); }
.danger { background: var(--danger-bg); border-left: 4px solid var(--danger-border); }
.note strong:first-child, .tip strong:first-child, .warning strong:first-child, .danger strong:first-child { display: block; margin-bottom: 2px; }

/* Home page */
.hero {
  background: linear-gradient(135deg, #7a0a1d 0%, var(--brand) 60%, #e05545 100%);
  color: #fff; border-radius: 14px; padding: 44px 40px; margin-bottom: 34px;
}
.hero h1 { border: none; padding: 0; margin: 0 0 12px; font-size: 34px; color: #fff; }
.hero p { font-size: 17px; max-width: 720px; opacity: .95; }
.hero .hero-actions { margin-top: 22px; display: flex; gap: 12px; flex-wrap: wrap; }
.hero .btn {
  display: inline-block; padding: 10px 20px; border-radius: 8px;
  text-decoration: none; font-weight: 600; font-size: 15px;
}
.hero .btn-primary { background: #fff; color: var(--brand-dark); }
.hero .btn-ghost { border: 1.5px solid rgba(255,255,255,.7); color: #fff; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; margin: 24px 0; }
.card {
  border: 1px solid var(--border); border-radius: 10px; padding: 20px;
  background: #fff; transition: box-shadow .15s ease, transform .15s ease;
}
.card:hover { box-shadow: 0 6px 18px rgba(20,30,60,.09); transform: translateY(-2px); }
.card h3 { margin: 0 0 8px; font-size: 16px; }
.card p { font-size: 14px; color: var(--text-soft); margin: 0 0 12px; }
.card a.card-link { font-size: 14px; font-weight: 600; text-decoration: none; }
.card .emoji { font-size: 26px; }

/* Badges */
.badge {
  display: inline-block; font-size: 11.5px; font-weight: 700;
  padding: 2px 9px; border-radius: 999px; vertical-align: middle;
}
.badge-get { background: #e3f2e9; color: #146c43; }
.badge-post { background: #e2ecfd; color: #1d4fa1; }
.badge-put { background: #fdf0dc; color: #9a6206; }
.badge-delete { background: #fde3e6; color: #a11427; }

.page-footer {
  margin-top: 56px; padding-top: 18px; border-top: 1px solid var(--border);
  font-size: 13px; color: var(--text-soft);
}
.page-footer p { margin: 2px 0; }

/* Responsive */
@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .topnav { display: none; }
  .shell { display: block; }
  .sidebar {
    position: fixed; top: 56px; left: 0; bottom: 0; z-index: 40;
    width: 280px; transform: translateX(-100%);
    transition: transform .2s ease; box-shadow: 2px 0 12px rgba(0,0,0,.12);
    height: auto;
  }
  .sidebar.open { transform: translateX(0); }
  .content { padding: 22px 20px 60px; }
  h1 { font-size: 25px; }
  .hero { padding: 30px 24px; }
  .hero h1 { font-size: 26px; }
}