/* TGB Docs — системные шрифты, два режима: desktop и mobile */

:root {
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas,
          "Liberation Mono", monospace;
  --bg: #ffffff;
  --bg-side: #f6f7f9;
  --fg: #1b1f24;
  --muted: #6a737d;
  --line: #e2e5e9;
  --accent: #0b5fff;
  --accent-soft: rgba(11, 95, 255, .09);
  --topbar-h: 52px;
  --side-w: 300px;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a; --bg-side: #1a1d22; --fg: #e4e7eb;
    --muted: #8b949e; --line: #2c3138; --accent: #4c8dff;
    --accent-soft: rgba(76, 141, 255, .15);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
}

/* ---------- layout ---------- */

.layout { min-height: 100vh; }

.topbar {
  position: fixed; inset: 0 0 auto 0; height: var(--topbar-h);
  display: flex; align-items: center; gap: 12px;
  padding: 0 16px 0 8px;
  background: var(--bg); border-bottom: 1px solid var(--line);
  z-index: 30;
}

.burger {
  display: none;
  width: 44px; height: 44px; padding: 12px;
  background: none; border: 0; cursor: pointer;
}
.burger span {
  display: block; height: 2px; margin: 5px 0;
  background: var(--fg); border-radius: 2px;
}

.crumbs {
  flex: 1; min-width: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  font-size: 14px; color: var(--muted);
}
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.crumbs b { color: var(--fg); font-weight: 600; }
.crumbs .sep { margin: 0 6px; color: var(--line); }

.topbar-right { display: flex; align-items: center; gap: 10px; }
.user-badge {
  font-size: 12px; font-weight: 600; letter-spacing: .04em;
  color: var(--muted); border: 1px solid var(--line);
  padding: 3px 8px; border-radius: 20px;
}
.logout {
  color: var(--muted); text-decoration: none; font-size: 18px;
  padding: 6px;
}
.logout:hover { color: var(--fg); }

.sidebar {
  position: fixed; top: var(--topbar-h); bottom: 0; left: 0;
  width: var(--side-w); overflow-y: auto; overscroll-behavior: contain;
  background: var(--bg-side); border-right: 1px solid var(--line);
  padding: 10px 8px 40px;
}

.side-head {
  padding: 6px 10px 14px;
  font-size: 18px; font-weight: 700; letter-spacing: -.02em;
}
.side-head a { color: var(--fg); text-decoration: none; }
.side-head span { color: var(--accent); font-weight: 400; }

.content {
  margin-left: var(--side-w);
  padding: calc(var(--topbar-h) + 28px) 40px 80px;
  max-width: calc(var(--side-w) + 880px);
}

.backdrop { display: none; }

/* ---------- tree ---------- */

.tree { font-size: 13.5px; }
.tree-file {
  display: block; padding: 4px 10px; border-radius: 6px;
  color: var(--fg); text-decoration: none;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.tree-file:hover { background: var(--accent-soft); }
.tree-file.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.tree-dir > summary {
  list-style: none; padding: 4px 10px; border-radius: 6px;
  cursor: pointer; user-select: none;
}
.tree-dir > summary::-webkit-details-marker { display: none; }
.tree-dir > summary::before {
  content: "▸"; display: inline-block; margin-right: 6px;
  color: var(--muted); font-size: 11px; transition: transform .12s;
}
.tree-dir[open] > summary::before { transform: rotate(90deg); }
.tree-dir > summary:hover { background: var(--accent-soft); }
.tree-dir .dir-link { color: var(--fg); text-decoration: none; font-weight: 600; }
.tree-kids { margin-left: 12px; border-left: 1px solid var(--line); padding-left: 6px; }

/* ---------- login ---------- */

.login-page {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; padding: 20px;
}
.login-card {
  width: 100%; max-width: 340px;
  border: 1px solid var(--line); border-radius: 16px;
  padding: 32px 28px; background: var(--bg);
}
.login-logo {
  font-size: 28px; font-weight: 800; letter-spacing: -.02em;
  margin-bottom: 24px; text-align: center;
}
.login-logo span { color: var(--accent); font-weight: 400; }
.login-card label {
  display: block; font-size: 13px; color: var(--muted); margin-bottom: 8px;
}
.login-card input {
  width: 100%; padding: 14px; font-size: 24px; text-align: center;
  letter-spacing: .3em; font-family: var(--mono);
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg); color: var(--fg); outline: none;
}
.login-card input:focus { border-color: var(--accent); }
.login-card button {
  width: 100%; margin-top: 16px; padding: 13px;
  font-size: 15px; font-weight: 600;
  color: #fff; background: var(--accent);
  border: 0; border-radius: var(--radius); cursor: pointer;
}
.login-error {
  margin-top: 10px; font-size: 13px; color: #d33; text-align: center;
}

/* ---------- markdown ---------- */

.markdown-body { max-width: 800px; }
.markdown-body h1 { font-size: 28px; line-height: 1.25; margin: 0 0 20px; letter-spacing: -.02em; }
.markdown-body h2 { font-size: 21px; margin: 34px 0 12px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.markdown-body h3 { font-size: 17px; margin: 26px 0 10px; }
.markdown-body h4 { font-size: 15px; margin: 22px 0 8px; }
.markdown-body p { margin: 0 0 14px; }
.markdown-body a { color: var(--accent); }
.markdown-body img { max-width: 100%; height: auto; border-radius: 8px; }
.markdown-body ul, .markdown-body ol { padding-left: 24px; margin: 0 0 14px; }
.markdown-body li { margin: 4px 0; }
.markdown-body blockquote {
  margin: 0 0 14px; padding: 8px 16px;
  border-left: 3px solid var(--line); color: var(--muted);
}
.markdown-body code {
  font-family: var(--mono); font-size: .88em;
  background: var(--bg-side); border: 1px solid var(--line);
  border-radius: 5px; padding: 1px 5px;
}
.markdown-body pre {
  background: var(--bg-side); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 14px 16px;
  overflow-x: auto; margin: 0 0 14px;
  font-size: 13px; line-height: 1.55;
}
.markdown-body pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.markdown-body table {
  border-collapse: collapse; margin: 0 0 16px;
  display: block; overflow-x: auto; max-width: 100%;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--line); padding: 7px 12px;
  text-align: left; vertical-align: top; font-size: 14px;
}
.markdown-body th { background: var(--bg-side); font-weight: 600; }
.markdown-body hr { border: 0; border-top: 1px solid var(--line); margin: 28px 0; }
.markdown-body pre.raw { white-space: pre-wrap; word-break: break-word; }

/* index cards */
.cards {
  display: grid; gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  margin: 0 0 8px;
}
.card {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px; border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--fg); text-decoration: none; font-weight: 600; font-size: 14px;
}
.card:hover { border-color: var(--accent); background: var(--accent-soft); }
.card-ico { font-size: 18px; }
.file-list { list-style: none; padding: 0; }
.file-list li {
  display: flex; align-items: baseline; gap: 10px;
  padding: 7px 0; border-bottom: 1px solid var(--line);
}
.file-list a { color: var(--fg); font-weight: 500; }
.file-ext { font-family: var(--mono); font-size: 12px; color: var(--muted); }

/* ---------- mobile ---------- */

@media (max-width: 860px) {
  body { font-size: 14.5px; line-height: 1.5; }

  .burger { display: block; }
  .sidebar {
    transform: translateX(-100%);
    transition: transform .2s ease;
    width: min(84vw, 340px);
    top: 0; padding-top: 14px;
    z-index: 40; box-shadow: 0 0 40px rgba(0,0,0,.25);
  }
  .layout.nav-open .sidebar { transform: translateX(0); }
  .layout.nav-open .backdrop {
    display: block; position: fixed; inset: 0;
    background: rgba(0,0,0,.35); z-index: 35;
  }

  .tree { font-size: 14px; }
  .tree-file { padding: 6px 12px; }
  .tree-dir > summary { padding: 6px 12px; }

  .content {
    margin-left: 0;
    padding: calc(var(--topbar-h) + 20px) 18px 60px;
    max-width: none;
  }

  .markdown-body h1 { font-size: 22px; }
  .markdown-body h2 { font-size: 18px; margin: 26px 0 10px; }
  .markdown-body h3 { font-size: 16px; }
  .markdown-body p { margin-bottom: 10px; }
  .markdown-body pre { font-size: 12.5px; }
  .markdown-body th, .markdown-body td { font-size: 13.5px; padding: 6px 10px; }
  .markdown-body ul, .markdown-body ol { margin-bottom: 10px; }
  .markdown-body li { margin: 2px 0; }

  .crumbs { font-size: 14px; }
  .cards { grid-template-columns: 1fr 1fr; }
  .card { font-size: 14px; padding: 12px 14px; }
  .file-list li { padding: 8px 0; }

  .login-card { max-width: 400px; padding: 28px 22px; }
}