:root {
  --bg: #0b0e14;
  --bg-alt: #10141d;
  --bg-elev: #161b27;
  --border: #232a3a;
  --text: #e6e9ef;
  --text-dim: #9aa3b5;
  --accent: #5b8cff;
  --accent-2: #7c5bff;
  --green: #3ddc84;
  --red: #ff5c7a;
  --amber: #ffb454;
  --sidebar-w: 280px;
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
  font-size: 16px;
}

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

/* ===== Sidebar ===== */
.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: var(--bg-alt);
  border-right: 1px solid var(--border);
  padding: 20px 14px 40px;
  overflow-y: auto;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 8px 22px;
}
.brand-mark {
  width: 40px; height: 40px;
  flex: 0 0 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: #fff; font-size: 15px;
  letter-spacing: .5px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 16px; }
.brand-text span { font-size: 11px; color: var(--text-dim); }

.sidebar a {
  display: flex;
  align-items: center;
  padding: 9px 12px;
  margin: 2px 0;
  color: var(--text-dim);
  text-decoration: none;
  border-radius: 8px;
  font-size: 14px;
  transition: background .15s, color .15s;
}
.sidebar a:hover { background: var(--bg-elev); color: var(--text); }
.sidebar a.active { background: rgba(91,140,255,.12); color: var(--accent); font-weight: 600; }

.sidebar .cat {
  margin: 18px 8px 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: #6b7488;
  font-weight: 700;
}

/* ===== Main ===== */
.main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(11,14,20,.85);
  backdrop-filter: blur(8px);
  z-index: 50;
}
.breadcrumb { color: var(--text-dim); font-size: 13px; }
.menu-toggle { display: none; background: none; border: 1px solid var(--border); color: var(--text); border-radius: 8px; padding: 6px 10px; font-size: 16px; cursor: pointer; }

.content-wrap {
  flex: 1;
  max-width: 940px;
  width: 100%;
  margin: 0 auto;
  padding: 34px 28px 80px;
}

/* ===== Content ===== */
.content h1 {
  font-size: 30px;
  margin: 0 0 8px;
  line-height: 1.3;
}
.content h2 {
  font-size: 22px;
  margin: 32px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.content h3 { font-size: 18px; margin: 24px 0 8px; }
.content p { margin: 10px 0; }
.content a { color: var(--accent); }
.content strong { color: #fff; }
.content ul, .content ol { padding-left: 22px; }
.content li { margin: 5px 0; }
.content code {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px 6px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .86em;
  color: var(--amber);
}
.content pre {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
}
.content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: .85em;
  line-height: 1.55;
}
.content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}
.content blockquote {
  margin: 12px 0;
  padding: 10px 18px;
  border-left: 3px solid var(--accent);
  background: var(--bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-dim);
}
.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 14px 0;
}
.content th, .content td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
  font-size: 14px;
}
.content th { background: var(--bg-elev); color: #fff; }
.content tr:nth-child(even) { background: var(--bg-alt); }

/* ===== Hero / Cards (index) ===== */
.hero {
  padding: 24px 0 16px;
}
.hero h1 { font-size: 36px; margin: 0; }
.hero h1 span { display: block; font-size: 15px; color: var(--accent); font-weight: 600; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 8px; }
.hero .lead { font-size: 17px; color: var(--text-dim); margin: 14px 0 22px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 8px; padding-bottom: 8px; }
.btn {
  display: inline-block;
  padding: 6px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 13px;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: rgba(91,140,255,.15); border-color: var(--accent); color: var(--accent); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 16px;
  padding-top: 12px;
}
.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  transition: transform .15s, border-color .15s, background .15s;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); background: var(--bg-elev); }
.card-cat { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--accent); font-weight: 700; margin-bottom: 8px; }
.card-title { font-size: 17px; font-weight: 700; color: var(--text); text-decoration: none; }
.card-title:hover { color: var(--accent); }
.card-desc { font-size: 13px; color: var(--text-dim); margin: 8px 0 0; }

/* ===== Responsive ===== */
@media (max-width: 820px) {
  .sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    transform: translateX(-100%);
    transition: transform .2s ease;
    z-index: 100;
    height: 100vh;
    width: min(300px, 82vw);
  }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: inline-block; }
  .content-wrap { padding: 22px 18px 60px; }
  .hero h1 { font-size: 27px; }
}