:root {
  --bg: #f4efe6;
  --bg-2: #ebe4d6;
  --paper: #fffaf1;
  --ink: #241c16;
  --muted: #6d6156;
  --line: #d9cfc0;
  --accent: #b5481f;
  --accent-2: #2f5e4e;
  --done: #2f5e4e;
  --code-bg: #1f1a17;
  --code-ink: #f4efe6;
  --shadow: 0 18px 50px rgba(36, 28, 22, 0.08);
  --sidebar: 280px;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Source Sans 3", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

:root[data-theme="dark"] {
  --bg: #161310;
  --bg-2: #1e1915;
  --paper: #211c18;
  --ink: #f3ebe1;
  --muted: #b3a496;
  --line: #3a322b;
  --accent: #e07a4c;
  --accent-2: #7dbaa4;
  --done: #7dbaa4;
  --code-bg: #0f0d0b;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.shell {
  display: grid;
  grid-template-columns: var(--sidebar) 1fr;
  min-height: 100%;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 1.25rem 1rem 2rem;
  background: var(--bg-2);
  border-right: 1px solid var(--line);
}

.brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  color: inherit;
  text-decoration: none;
  margin-bottom: 1.1rem;
}
.brand-mark {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 0.7rem;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: #fffaf1;
  font-family: var(--serif);
  font-weight: 620;
}
.brand strong { display: block; font-size: 0.95rem; }
.brand em {
  display: block;
  font-style: normal;
  color: var(--muted);
  font-size: 0.78rem;
}

.search input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 0.7rem;
  padding: 0.55rem 0.7rem;
  font: inherit;
  margin-bottom: 1rem;
}
.search input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.nav-group { margin-bottom: 1rem; }
.nav-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0.3rem 0.35rem;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.38rem 0.55rem;
  border-radius: 0.55rem;
  color: inherit;
  text-decoration: none;
  font-size: 0.92rem;
}
.nav-link:hover, .nav-link.active { background: var(--paper); }
.nav-link.active { color: var(--accent); font-weight: 600; }
.dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  border: 1.5px solid var(--line);
  flex: none;
}
.dot.done { background: var(--done); border-color: var(--done); }

.main { min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.crumbs { margin: 0; color: var(--muted); font-size: 0.9rem; flex: 1; }
.top-actions { margin-left: auto; display: flex; gap: 0.4rem; }
.ghost {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font: inherit;
  cursor: pointer;
}
#menu-btn { display: none; }

@media (display-mode: standalone) {
  .topbar { padding-top: max(0.75rem, env(safe-area-inset-top)); }
  #install-btn { display: none !important; }
}

.page {
  flex: 1;
  width: min(780px, calc(100% - 3rem));
  margin: 1.5rem auto 3rem;
}

.page h1, .page h2, .page h3 {
  font-family: var(--serif);
  font-weight: 620;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.page h1 { font-size: 2.15rem; margin: 0 0 0.8rem; }
.page h2 { font-size: 1.45rem; margin-top: 2rem; }
.page blockquote {
  margin: 0 0 1.2rem;
  padding: 0.85rem 1rem;
  background: var(--paper);
  border-left: 4px solid var(--accent);
  border-radius: 0 0.8rem 0.8rem 0;
  box-shadow: var(--shadow);
}
.page blockquote p { margin: 0.2rem 0; }
.page table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.page th, .page td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  padding: 0.45rem 0.4rem;
  vertical-align: top;
}
.page pre {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 0.9rem;
  padding: 1rem 1.1rem;
  overflow: auto;
  box-shadow: var(--shadow);
}
.page pre code { font-family: var(--mono); font-size: 0.84rem; background: none; padding: 0; }
.page :not(pre) > code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--bg-2);
  padding: 0.1em 0.35em;
  border-radius: 0.3rem;
}
.page img { max-width: 100%; }
.page hr { border: 0; border-top: 1px solid var(--line); }
.page details {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  padding: 0.7rem 1rem;
  margin: 0.6rem 0 1rem;
}
.page summary { cursor: pointer; font-weight: 600; color: var(--accent-2); }
.page li.task { list-style: none; margin-left: -1.2rem; }
.page li.task input { margin-right: 0.45rem; accent-color: var(--accent-2); }

.home-hero {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  padding: 1.6rem 1.7rem 1.4rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.4rem;
}
.home-hero h1 { margin-bottom: 0.4rem; }
.home-hero p { color: var(--muted); margin-top: 0; }
.progress-row { display: flex; align-items: center; gap: 0.8rem; margin-top: 1rem; }
.bar {
  flex: 1;
  height: 0.55rem;
  background: var(--bg-2);
  border-radius: 999px;
  overflow: hidden;
}
.bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #e0a15a);
  width: 0;
}
.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}
.card {
  display: block;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1rem 1.05rem;
  color: inherit;
  text-decoration: none;
  min-height: 8.2rem;
}
.card:hover { border-color: var(--accent); }
.card h2 { font-size: 1.15rem; margin: 0 0 0.3rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.card .meta { margin-top: 0.8rem; font-size: 0.8rem; color: var(--accent-2); font-weight: 600; }
.continue {
  margin-top: 1.2rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  background: #2a211c;
  color: #f6efe6;
  border-radius: 1rem;
  padding: 1rem 1.15rem;
  text-decoration: none;
}
.continue strong { display: block; font-family: var(--serif); font-size: 1.15rem; }
.continue span { color: #d8c8b6; font-size: 0.9rem; }
.continue b { color: #f0c9a0; }

.file-note {
  background: var(--paper);
  border: 1px dashed var(--line);
  border-radius: 0.9rem;
  padding: 0.9rem 1rem;
  margin-bottom: 1rem;
  color: var(--muted);
}

.pager {
  position: sticky;
  bottom: 0;
  display: flex;
  gap: 0.6rem;
  justify-content: space-between;
  align-items: stretch;
  padding: 0.8rem 1.5rem 1.1rem;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  z-index: 3;
}
.pager a, .pager button {
  border: 1px solid var(--line);
  background: var(--paper);
  color: inherit;
  text-decoration: none;
  border-radius: 0.8rem;
  padding: 0.65rem 0.85rem;
  font: inherit;
  cursor: pointer;
  min-width: 8rem;
}
.pager .short { display: none; }
.pager .next { background: var(--accent); color: #fffaf1; border-color: var(--accent); }
.pager .done[aria-pressed="true"] { background: var(--done); color: #fff; border-color: var(--done); }

.scrim {
  position: fixed;
  inset: 0;
  background: rgba(20, 14, 10, 0.35);
  z-index: 8;
}

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    z-index: 9;
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    width: min(86vw, 320px);
  }
  .sidebar.open { transform: none; }
  #menu-btn { display: inline-flex; }
  .cards { grid-template-columns: 1fr; }
  .page { width: min(100% - 2rem, 780px); margin-bottom: 5.5rem; }
  .pager {
    position: fixed;
    left: 0.75rem;
    right: 0.75rem;
    bottom: 0;
    gap: 0.35rem;
    padding: 0.4rem;
    margin: 0 0 calc(0.75rem + env(safe-area-inset-bottom, 0px));
    border: 1px solid var(--line);
    border-radius: 0.85rem;
    background: var(--paper);
    box-shadow: var(--shadow);
  }
  .pager a, .pager button {
    flex: 1;
    min-width: 0;
    padding: 0.38rem 0.4rem;
    font-size: 0.75rem;
    line-height: 1.2;
    border-radius: 0.55rem;
    text-align: center;
  }
  .pager .full { display: none; }
  .pager .short { display: inline; }
}
}