:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #16212b;
  --ink-dim: #5b6b78;
  --border: #dde3e8;
  --accent: #0b5d78;
  --accent-ink: #ffffff;
  --slo1: #0b5d78;
  --slo3: #a13d1f;
  --slo4: #7a2e8a;
  --slo5: #1f7a3d;
  --slo6: #8a6d1f;
  --slo7: #565656;
  --danger: #b3261e;
  --ok: #1f7a3d;
  --warn: #a16a00;
  --code-bg: #eef2f5;
  --shadow: 0 1px 2px rgba(20,30,40,.06), 0 2px 8px rgba(20,30,40,.05);
  --radius: 10px;
  font-size: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10161c;
    --panel: #171f27;
    --ink: #e7edf2;
    --ink-dim: #97a6b2;
    --border: #2a3742;
    --accent: #4fb3d9;
    --accent-ink: #06222b;
    --slo1: #4fb3d9;
    --slo3: #e08a5f;
    --slo4: #cf8fe0;
    --slo5: #7fd39a;
    --slo6: #e0c26f;
    --slo7: #a9b4bd;
    --code-bg: #101a22;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 14px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

a { color: var(--accent); }

.app {
  display: grid;
  grid-template-columns: 300px 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "topbar topbar"
    "sidebar main";
  height: 100vh;
  height: 100dvh; /* mobile browsers: accounts for the address bar instead of clipping content */
}

.topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  z-index: 5;
}
.topbar .brand { font-weight: 700; font-size: 1.05rem; white-space: nowrap; }
.topbar .brand small { display:block; font-weight: 400; color: var(--ink-dim); font-size: .72rem; }
.topbar .spacer { flex: 1; }
.topbar input[type=search] {
  width: 100%;
  max-width: 420px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  font-size: .9rem;
}
.topbar nav { display: flex; gap: 6px; }
.topbar nav a {
  text-decoration: none;
  color: var(--ink-dim);
  font-size: .85rem;
  padding: 6px 10px;
  border-radius: 8px;
}
.topbar nav a.active, .topbar nav a:hover { background: var(--code-bg); color: var(--ink); }
.topbar nav a span.short { display: none; }
.hamburger { display: none; }

.sidebar {
  grid-area: sidebar;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 10px 8px 40px;
}
.slo-group { margin-bottom: 4px; }
.slo-head {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 8px; cursor: pointer; border-radius: 8px;
  font-weight: 600; font-size: .82rem; user-select: none;
}
.slo-head:hover { background: var(--code-bg); }
.slo-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.slo-count { margin-left: auto; color: var(--ink-dim); font-weight: 400; font-size: .75rem; }
.slo-chevron { transition: transform .15s; color: var(--ink-dim); font-size: .7rem; }
.slo-group.collapsed .slo-chevron { transform: rotate(-90deg); }
.slo-group.collapsed .cat-list { display: none; }

.cat-block { margin: 2px 0 8px 4px; }
.cat-title {
  font-size: .68rem; text-transform: uppercase; letter-spacing: .04em;
  color: var(--ink-dim); padding: 6px 8px 2px;
}
.topic-link {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 10px; margin: 1px 0; border-radius: 8px;
  font-size: .85rem; color: var(--ink); text-decoration: none;
  cursor: pointer; border: 1px solid transparent;
}
.topic-link:hover { background: var(--code-bg); }
.topic-link.active { background: var(--accent); color: var(--accent-ink); }
.topic-link .stub-flag { font-size: .68rem; color: var(--warn); margin-left: auto; }
.topic-link.active .stub-flag { color: var(--accent-ink); opacity: .8; }
.topic-link .done-flag { color: var(--ok); font-size: .8rem; }

main {
  grid-area: main;
  overflow-y: auto;
  padding: 24px 28px 80px;
}
.content-wrap { max-width: 880px; margin: 0 auto; }

.topic-header { margin-bottom: 18px; }
.topic-toolbar { display: flex; gap: 8px; justify-content: flex-end; margin-bottom: 10px; }
.btn-sm { padding: 5px 11px; font-size: .78rem; }
.notes-panel {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 16px; margin-bottom: 18px; box-shadow: var(--shadow);
}
.notes-panel-head { display: flex; flex-direction: column; gap: 2px; margin-bottom: 8px; }
.notes-textarea {
  width: 100%; min-height: 120px; resize: vertical; padding: 10px 12px;
  border-radius: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--ink);
  font: inherit; font-size: .9rem; box-sizing: border-box;
}
.notes-status { display: block; margin-top: 6px; }

/* Full-screen distraction-free reading mode */
body.reading-mode .topbar,
body.reading-mode .sidebar,
body.reading-mode .sidebar-backdrop { display: none; }
body.reading-mode .app { grid-template-columns: 1fr; grid-template-areas: "main"; }
body.reading-mode main { padding: 28px 20px 80px; background: var(--panel); }
body.reading-mode .content-wrap { max-width: 760px; }

.badge-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; }
.badge {
  display: inline-block; font-size: .72rem; font-weight: 600;
  padding: 3px 9px; border-radius: 999px; color: #fff;
}
.badge.outline {
  color: var(--ink-dim); background: transparent; border: 1px solid var(--border); font-weight: 500;
}
.topic-header h1 { margin: 4px 0 6px; font-size: 1.55rem; }
.topic-summary { color: var(--ink-dim); font-size: .95rem; margin: 0 0 4px; }
.meta-line { font-size: .78rem; color: var(--ink-dim); }

.stub-notice {
  background: var(--code-bg); border: 1px dashed var(--border); border-radius: var(--radius);
  padding: 14px 16px; color: var(--ink-dim); font-size: .88rem; margin: 16px 0;
}

.section-block { margin: 22px 0; }
.section-heading-row {
  display: flex; align-items: baseline; justify-content: space-between; gap: 8px;
  margin: 0 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border);
}
.section-block h2 { font-size: 1.08rem; margin: 0; }
.section-note-btn {
  flex: none; background: none; border: none; cursor: pointer; font-size: .85rem;
  color: var(--ink-dim); opacity: .5; padding: 2px 4px; border-radius: 6px;
}
.section-note-btn:hover { opacity: 1; background: var(--code-bg); }
.section-note-btn.has-note { opacity: 1; color: var(--accent); }
.section-note-panel { margin: -4px 0 12px; }
.section-note-panel .section-note-textarea { min-height: 70px; }
.section-block ul, .section-block ol { margin: 0; padding-left: 1.25em; }
.section-block li { margin: 5px 0; font-size: .93rem; }
.section-block li::marker { color: var(--accent); }
.section-block.steps ol li { margin: 7px 0; }

.table-scroll { overflow-x: auto; margin: 6px 0; }
table.data-table { width: 100%; border-collapse: collapse; font-size: .87rem; margin: 0; min-width: 420px; }
table.data-table th, table.data-table td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; vertical-align: top; }
table.data-table th { background: var(--code-bg); font-size: .78rem; text-transform: uppercase; letter-spacing: .02em; }

.pearls-box {
  background: var(--code-bg); border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0;
  padding: 12px 16px; margin: 18px 0;
}
.pearls-box h2 { font-size: .95rem; margin: 0 0 8px; border: none; padding: 0; }
.pearls-box ul { padding-left: 1.1em; }
.pearls-box li { font-size: .89rem; margin: 4px 0; }

.image-figure { margin: 16px 0; text-align: center; }
.image-figure img, .image-figure svg { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); background: #fff; }
.image-figure figcaption { font-size: .78rem; color: var(--ink-dim); margin-top: 6px; }

.guideline-refs { margin-top: 24px; padding-top: 12px; border-top: 1px solid var(--border); font-size: .8rem; color: var(--ink-dim); }
.guideline-refs a { margin-right: 10px; }

.qbank-cta {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 16px; margin: 20px 0 4px;
}
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink); border: none;
  padding: 8px 16px; border-radius: 8px; font-size: .85rem; font-weight: 600; cursor: pointer; text-decoration: none;
}
.btn.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* Quiz */
.quiz-shell { max-width: 720px; margin: 0 auto; }
.quiz-progress { display:flex; justify-content: space-between; font-size:.8rem; color:var(--ink-dim); margin-bottom:10px;}
.quiz-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.quiz-stem { font-size: 1rem; margin-bottom: 16px; }
.quiz-options { display: flex; flex-direction: column; gap: 8px; }
.quiz-option {
  text-align: left; padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); cursor: pointer; font-size: .92rem; color: var(--ink);
}
.quiz-option:hover { border-color: var(--accent); }
.quiz-option.correct { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 14%, var(--panel)); }
.quiz-option.incorrect { border-color: var(--danger); background: color-mix(in srgb, var(--danger) 14%, var(--panel)); }
.quiz-option.disabled { pointer-events: none; opacity: .85; }
.quiz-explain { margin-top: 14px; padding: 12px 14px; background: var(--code-bg); border-radius: 8px; font-size: .89rem; }
.quiz-explain .verdict { font-weight: 700; }
.quiz-explain .verdict.right { color: var(--ok); }
.quiz-explain .verdict.wrong { color: var(--danger); }
.quiz-nav { display: flex; justify-content: space-between; margin-top: 16px; }
.quiz-setup { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.quiz-setup label { display:block; font-size:.85rem; margin: 12px 0 6px; font-weight: 600; }
.quiz-setup select, .quiz-setup input[type=number] { padding: 7px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--ink); width: 100%; }
.chip-select { display:flex; flex-wrap:wrap; gap:6px; }
.chip {
  padding: 5px 11px; border-radius: 999px; border: 1px solid var(--border); font-size: .78rem; cursor: pointer; background: var(--bg); color: var(--ink);
}
.chip.selected { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.quiz-summary { text-align: center; padding: 30px 20px; }
.quiz-summary .score { font-size: 2.4rem; font-weight: 700; margin: 6px 0; }
.wrong-list { text-align: left; margin-top: 20px; }
.wrong-list .wq { padding: 10px 0; border-bottom: 1px solid var(--border); font-size: .88rem; }

/* Guidelines log page */
.gl-table-wrap { overflow-x: auto; }
table.gl-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
table.gl-table th, table.gl-table td { border-bottom: 1px solid var(--border); padding: 10px 12px; text-align: left; vertical-align: top; }
table.gl-table th { font-size: .72rem; text-transform: uppercase; color: var(--ink-dim); }
.status-pill { padding: 2px 9px; border-radius: 999px; font-size: .72rem; font-weight: 600; }
.status-pill.ok { background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); }
.status-pill.due { background: color-mix(in srgb, var(--warn) 20%, transparent); color: var(--warn); }
.status-pill.overdue { background: color-mix(in srgb, var(--danger) 18%, transparent); color: var(--danger); }

.empty-state { padding: 60px 20px; text-align: center; color: var(--ink-dim); }

.home-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px,1fr)); gap: 14px; margin-top: 18px; }
.home-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.home-card h3 { margin: 0 0 6px; font-size: 1rem; }
.home-card .stat { font-size: 1.7rem; font-weight: 700; }
.home-progress-bar { height: 6px; border-radius: 4px; background: var(--code-bg); overflow: hidden; margin-top: 8px; }
.home-progress-bar > div { height: 100%; background: var(--accent); }

/* Full-text guideline documents (rendered from markdown) */
.md-doc { font-size: .93rem; line-height: 1.6; }
.md-doc h1 { font-size: 1.35rem; margin: 26px 0 10px; }
.md-doc h2 { font-size: 1.12rem; margin: 24px 0 8px; padding-bottom: 5px; border-bottom: 1px solid var(--border); }
.md-doc h3 { font-size: 1rem; margin: 18px 0 6px; color: var(--ink); }
.md-doc h4 { font-size: .92rem; margin: 14px 0 4px; color: var(--ink-dim); text-transform: uppercase; letter-spacing: .02em; }
.md-doc h1:first-child, .md-doc h2:first-child, .md-doc h3:first-child { margin-top: 0; }
.md-doc p { margin: 8px 0; }
.md-doc ul, .md-doc ol { margin: 8px 0; padding-left: 22px; }
.md-doc li { margin: 3px 0; }
.md-doc hr { border: none; border-top: 1px solid var(--border); margin: 20px 0; }
.md-doc code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; font-size: .85em; }
.md-doc table.data-table { font-size: .82rem; }
.md-doc a { color: var(--accent); }

/* Recalls */
.recall-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px,1fr)); gap: 12px; margin-top: 14px; }
.recall-card {
  display: block; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; box-shadow: var(--shadow); color: var(--ink); text-decoration: none;
}
.recall-card:hover { border-color: var(--accent); }
.recall-card-title { font-weight: 600; margin-bottom: 4px; }
.quiz-explain-html { margin-top: 10px; font-size: .89rem; }
.quiz-explain-html p, .quiz-explain-html ul, .quiz-explain-html ol { margin: 6px 0; }
.quiz-explain-html ul, .quiz-explain-html ol { padding-left: 20px; }
.quiz-explain-html img { max-width: 100%; border-radius: 6px; margin: 8px 0; }
.quiz-explain-html h1, .quiz-explain-html h2, .quiz-explain-html h3, .quiz-explain-html h4, .quiz-explain-html h5 { margin: 10px 0 4px; font-size: .95rem; }
.verdict-inline { font-weight: 700; font-size: .82rem; }
.verdict-inline.right { color: var(--ok); }
.verdict-inline.wrong { color: var(--danger); }
.selected-answer { border-color: var(--accent) !important; background: color-mix(in srgb, var(--accent) 14%, var(--bg)) !important; }
.btn-outline { background: transparent; color: var(--ink); border: 1px solid var(--border); }
.btn-warn { background: var(--warn); }

/* Mock exam summary cards on the Recalls page */
.mock-summary-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); margin-top: 14px; }
.mock-summary-card h3 { margin: 0 0 8px; }
.mock-section-rows { display: flex; flex-direction: column; gap: 8px; }
.mock-section-row { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-top: 1px solid var(--border); }
.mock-row-right { display: flex; align-items: center; gap: 10px; }

/* Mock exam-taking screen */
.mock-shell { max-width: 900px; margin: 0 auto; }
.mock-topbar {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 10px 16px; margin-bottom: 12px; position: sticky; top: 0; z-index: 3; box-shadow: var(--shadow);
}
.mock-timer { font-variant-numeric: tabular-nums; font-size: 1.15rem; font-weight: 700; }
.btn-submit { background: var(--danger); }
.mock-palette {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(34px,1fr)); gap: 6px;
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px; margin-bottom: 12px; max-height: 220px; overflow-y: auto;
}
.palette-btn {
  aspect-ratio: 1; border-radius: 6px; border: 1px solid var(--border); background: var(--bg);
  color: var(--ink); cursor: pointer; font-size: .78rem;
}
.palette-btn.answered { background: color-mix(in srgb, var(--ok) 20%, var(--bg)); border-color: var(--ok); }
.palette-btn.flagged { border-color: var(--warn); box-shadow: inset 0 0 0 2px var(--warn); }
.palette-btn.current { outline: 2px solid var(--accent); outline-offset: 1px; }

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; grid-template-areas: "topbar" "main"; }
  .hamburger {
    display: inline-flex; align-items:center; justify-content:center;
    width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border);
    background: var(--panel); color: var(--ink); cursor: pointer; font-size: 1rem;
  }
  .sidebar {
    position: fixed; top: 54px; left: 0; bottom: 0; width: 280px; max-width: 84vw;
    transform: translateX(-100%); transition: transform .18s ease; box-shadow: var(--shadow);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop { display:none; position: fixed; inset: 54px 0 0 0; background: rgba(0,0,0,.35); z-index: 4; }
  .sidebar-backdrop.open { display: none; }
  .topbar { gap: 6px; padding: 8px 10px; }
  .topbar .brand { font-size: .92rem; max-width: 30vw; overflow: hidden; text-overflow: ellipsis; }
  .topbar .brand small { display: none; }
  #search-wrap { margin: 0 6px !important; min-width: 0; max-width: none !important; }
  .topbar input[type=search] { max-width: none; }
  .topbar .spacer { display: none; }
  .topbar nav { gap: 2px; }
  .topbar nav a span.long { display: none; }
  .topbar nav a span.short { display: inline; font-size: 1.05rem; }
  .topbar nav a { padding: 6px 8px; }
}