/* Applied AI Guide — shared styles. Colours are tokens; dark mode redefines them. */
:root {
  --bg: #f6faf7;
  --surface: #ffffff;
  --surface-2: #eef5f0;
  --text: #17231e;
  --muted: #4f5f58;
  --border: #d9e5de;
  --accent: #1d7a4b;
  --accent-strong: #145c38;
  --accent-soft: #e3f3ea;
  --on-accent: #ffffff;
  --info: #1f5f99;   --info-soft: #e7f0fa;
  --warn: #8a5a00;   --warn-soft: #fdf3dc;
  --danger: #a3262a; --danger-soft: #fbe9e9;
  --human: #6a3fa0;  --human-soft: #f1eafa;
  --code-bg: #0f1a16;
  --code-text: #e3ece7;
  --shadow: 0 1px 2px rgba(16, 40, 28, .06), 0 4px 16px rgba(16, 40, 28, .05);
  --radius: 12px;
  --sidebar-w: 270px;
  --toc-w: 230px;
  --top-h: 60px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1311; --surface: #141c19; --surface-2: #1a2420; --text: #e3ece7; --muted: #a0b0a8;
    --border: #283630; --accent: #4cc38a; --accent-strong: #79d6a8; --accent-soft: #173226; --on-accent: #07130d;
    --info: #7db5ea; --info-soft: #15263a; --warn: #e9b949; --warn-soft: #33290f;
    --danger: #f08b8e; --danger-soft: #3a1a1b; --human: #c3a2ef; --human-soft: #2a2038;
    --code-bg: #0a100e; --shadow: none; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0d1311; --surface: #141c19; --surface-2: #1a2420; --text: #e3ece7; --muted: #a0b0a8;
  --border: #283630; --accent: #4cc38a; --accent-strong: #79d6a8; --accent-soft: #173226; --on-accent: #07130d;
  --info: #7db5ea; --info-soft: #15263a; --warn: #e9b949; --warn-soft: #33290f;
  --danger: #f08b8e; --danger-soft: #3a1a1b; --human: #c3a2ef; --human-soft: #2a2038;
  --code-bg: #0a100e; --shadow: none; color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top-h) + 16px); }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { color: var(--accent-strong); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3 { line-height: 1.25; }
h1 { font-size: clamp(1.7rem, 3vw, 2.3rem); margin: .2em 0 .4em; }
h2 { font-size: 1.45rem; margin: 2.4rem 0 .8rem; padding-top: .4rem; border-top: 1px solid var(--border); }
h3 { font-size: 1.12rem; margin: 1.6rem 0 .5rem; }
code { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: .9em; }
:not(pre) > code { background: var(--surface-2); padding: .1em .35em; border-radius: 5px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 100; background: var(--surface); padding: 8px 12px; }
button { font: inherit; cursor: pointer; }
table { border-collapse: collapse; width: 100%; font-size: .94rem; }
th, td { text-align: left; padding: .6rem .7rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface-2); }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30; height: var(--top-h);
  display: flex; align-items: center; gap: 12px; padding: 0 16px;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); text-decoration: none; white-space: nowrap; }
.logo-mark { min-width: 30px; padding: 0 6px; height: 30px; border-radius: 8px; background: var(--accent); color: var(--on-accent); display: grid; place-items: center; font-size: .78rem; }
.menu-btn { display: none; background: none; border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; color: var(--text); }
.search { position: relative; flex: 1; max-width: 420px; margin-left: auto; }
.search input {
  width: 100%; padding: 8px 12px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text); font: inherit;
}
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0; list-style: none; margin: 0; padding: 6px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow);
  max-height: 60vh; overflow: auto;
}
.search-results a { display: block; padding: 8px 10px; border-radius: 8px; text-decoration: none; color: var(--text); }
.search-results a:hover, .search-results a:focus { background: var(--accent-soft); }
.search-results small { color: var(--muted); display: block; }
.progress-pill { display: flex; align-items: center; gap: 8px; font-size: .85rem; color: var(--muted); white-space: nowrap; }
.progress-pill .bar { width: 70px; height: 8px; border-radius: 99px; background: var(--surface-2); overflow: hidden; border: 1px solid var(--border); }
.progress-pill .bar span { display: block; height: 100%; background: var(--accent); }
.profile { position: relative; }
.profile > button {
  width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--accent-soft); color: var(--accent-strong); font-weight: 700;
}
.profile-menu {
  position: absolute; right: 0; top: calc(100% + 8px); width: 240px; padding: 12px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow);
}
.profile-menu p { margin: 0 0 8px; font-size: .9rem; color: var(--muted); }
.profile-menu label { display: block; font-size: .85rem; font-weight: 600; margin: 8px 0 4px; }
.profile-menu select, .profile-menu button { width: 100%; padding: 7px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface-2); color: var(--text); }
.profile-menu button { margin-top: 10px; }

/* ---------- Layout ---------- */
.layout { display: grid; grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--toc-w); min-height: calc(100vh - var(--top-h)); }
.layout.no-toc { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
.sidebar {
  position: sticky; top: var(--top-h); height: calc(100vh - var(--top-h)); overflow-y: auto;
  padding: 18px 12px; border-right: 1px solid var(--border); background: var(--surface);
}
.sidebar details { margin-bottom: 4px; }
.sidebar summary { font-weight: 700; padding: 6px 10px; border-radius: 8px; cursor: pointer; list-style-position: inside; }
.sidebar summary:hover { background: var(--surface-2); }
.sidebar ol, .sidebar ul { list-style: none; margin: 4px 0 0; padding: 0 0 0 10px; }
.sidebar a {
  display: flex; align-items: center; gap: 8px; padding: 7px 10px; border-radius: 8px;
  color: var(--text); text-decoration: none; font-size: .95rem;
}
.sidebar a:hover { background: var(--surface-2); }
.sidebar a[aria-current="page"] { background: var(--accent-soft); color: var(--accent-strong); font-weight: 600; }
.sidebar .num { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-size: .75rem; border: 1px solid var(--border); flex-shrink: 0; }
.sidebar .done .num { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.sidebar-note { margin: 16px 10px 0; font-size: .8rem; color: var(--muted); }

main { padding: 28px clamp(16px, 4vw, 48px) 64px; max-width: 900px; width: 100%; margin: 0 auto; }
.toc { position: sticky; top: var(--top-h); height: calc(100vh - var(--top-h)); overflow-y: auto; padding: 24px 16px; font-size: .88rem; border-left: 1px solid var(--border); }
.toc h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); border: 0; margin: 0 0 8px; padding: 0; }
.toc ol { list-style: none; padding: 0; margin: 0 0 20px; }
.toc a { display: block; padding: 3px 8px; color: var(--muted); text-decoration: none; border-left: 2px solid transparent; }
.toc a:hover, .toc a.active { color: var(--accent-strong); border-left-color: var(--accent); }

.breadcrumb { font-size: .85rem; color: var(--muted); }
.breadcrumb a { color: var(--muted); }
.lead { font-size: 1.12rem; color: var(--muted); }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 0; padding: 0; list-style: none; }
.tag { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 99px; font-size: .78rem; font-weight: 600; background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); }
.tag.green { background: var(--accent-soft); color: var(--accent-strong); border-color: transparent; }
.tag.blue { background: var(--info-soft); color: var(--info); border-color: transparent; }
.tag.purple { background: var(--human-soft); color: var(--human); border-color: transparent; }

/* ---------- Content blocks ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid-2 { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card h3 { margin-top: 0; }
.callout { border-left: 4px solid var(--info); background: var(--info-soft); padding: 12px 16px; border-radius: 0 10px 10px 0; margin: 16px 0; }
.callout > :first-child { margin-top: 0; } .callout > :last-child { margin-bottom: 0; }
.callout.tip { border-color: var(--accent); background: var(--accent-soft); }
.callout.warn { border-color: var(--warn); background: var(--warn-soft); }
.callout.danger { border-color: var(--danger); background: var(--danger-soft); }
.callout strong:first-child { display: block; margin-bottom: 2px; }
.terms { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 12px 0; }
.terms dt { font-weight: 700; }
.terms dd { margin: 0; color: var(--muted); }
@media (max-width: 560px) { .terms { grid-template-columns: 1fr; } .terms dd { margin-bottom: 8px; } }
.steps { counter-reset: s; list-style: none; padding: 0; }
.steps > li { counter-increment: s; position: relative; padding: 2px 0 12px 44px; }
.steps > li::before {
  content: counter(s); position: absolute; left: 0; top: 0; width: 30px; height: 30px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent-strong); font-weight: 700; display: grid; place-items: center;
}
.pros-cons { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.pros-cons .card h3 { font-size: 1rem; }
.pros-cons ul { padding-left: 1.1rem; margin: 0; }
.takeaways li { margin-bottom: 6px; }
.project { border: 2px dashed var(--accent); background: var(--accent-soft); border-radius: var(--radius); padding: 16px 20px; }
.project > :first-child { margin-top: 0; }

/* ---------- Code ---------- */
.code { margin: 16px 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); background: var(--code-bg); }
.code-head { display: flex; align-items: center; gap: 10px; padding: 8px 12px; background: rgba(255,255,255,.06); color: #b9c8c0; font-size: .8rem; flex-wrap: wrap; }
.code-head .file { font-family: ui-monospace, Consolas, monospace; }
.code-head .kind { padding: 2px 8px; border-radius: 99px; font-weight: 700; }
.kind.exec { background: #1d7a4b; color: #fff; }
.kind.pseudo { background: #8a5a00; color: #fff; }
.kind.output { background: #34495e; color: #fff; }
.kind.config { background: #1f5f99; color: #fff; }
.code-head button { margin-left: auto; background: transparent; color: #e3ece7; border: 1px solid #3a4a43; border-radius: 6px; padding: 3px 10px; font-size: .8rem; }
.code-head button:hover { background: #22302a; }
.code pre { margin: 0; padding: 14px 16px; overflow-x: auto; color: var(--code-text); font-size: .86rem; line-height: 1.6; }
.code .c { color: #8fb3a0; font-style: italic; }
.code .s { color: #f2c38b; }
.code .k { color: #7fc8ff; font-weight: 600; }
.code .n { color: #d5a6ff; }
.code .d { color: #ff9e9e; }

/* ---------- Diagrams ---------- */
figure.flow { margin: 16px 0; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; }
figure.flow svg { width: 100%; height: auto; display: block; max-height: 80vh; }
figure.flow figcaption { font-size: .9rem; color: var(--muted); margin-top: 8px; }
.flow-tools { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; font-size: .78rem; color: var(--muted); }
.flow-tools button { background: var(--surface-2); color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 3px 10px; font-size: .8rem; }
.legend { display: flex; gap: 12px; flex-wrap: wrap; }
.legend i { display: inline-block; width: 14px; height: 10px; margin-right: 4px; vertical-align: middle; border: 1.5px solid; }
.legend .l-io { border-radius: 6px; background: var(--accent-soft); border-color: var(--accent); }
.legend .l-proc { background: var(--surface); border-color: var(--muted); }
.legend .l-dec { transform: rotate(45deg) scale(.8); background: var(--warn-soft); border-color: var(--warn); }
.legend .l-human { background: var(--human-soft); border-color: var(--human); border-radius: 3px; }
svg .n-io rect { fill: var(--accent-soft); stroke: var(--accent); }
svg .n-proc rect { fill: var(--surface); stroke: var(--muted); }
svg .n-dec polygon { fill: var(--warn-soft); stroke: var(--warn); }
svg .n-human rect { fill: var(--human-soft); stroke: var(--human); }
svg .node text { fill: var(--text); font: 600 14px system-ui, sans-serif; }
svg .edge { stroke: var(--muted); stroke-width: 1.6; fill: none; }
svg .edge.loop { stroke-dasharray: 5 4; }
svg .arrowhead { fill: var(--muted); }
svg .edge-label { fill: var(--muted); font: 12px system-ui, sans-serif; }
dialog.zoom { width: min(1100px, 96vw); max-height: 94vh; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); padding: 16px; }
dialog.zoom::backdrop { background: rgba(0,0,0,.55); }
dialog.zoom svg { width: 100%; min-width: 600px; height: auto; }
dialog.zoom .zoom-body { overflow: auto; }
dialog.zoom form { text-align: right; margin-bottom: 8px; }

/* ---------- Quiz ---------- */
.quiz { margin: 14px 0; padding: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.quiz > p:first-child { font-weight: 600; margin-top: 0; }
.quiz .opts { display: grid; gap: 8px; }
.quiz .opts button { text-align: left; padding: 9px 12px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface-2); color: var(--text); }
.quiz .opts button:hover:not(:disabled) { border-color: var(--accent); }
.quiz .opts button.right { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-strong); font-weight: 600; }
.quiz .opts button.wrong { background: var(--danger-soft); border-color: var(--danger); color: var(--danger); }
.quiz .opts button:disabled { cursor: default; }
.quiz .explain { margin: 10px 0 0; padding: 10px 12px; border-radius: 8px; background: var(--surface-2); }
.quiz-score { font-weight: 600; color: var(--accent-strong); }

/* ---------- Demos ---------- */
.demo { margin: 16px 0; border: 1px solid var(--accent); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.demo-head { padding: 10px 16px; background: var(--accent-soft); display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.demo-head strong { color: var(--accent-strong); }
.demo-head small { color: var(--muted); }
.demo-body { padding: 16px; }
.demo-controls { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; align-items: center; }
.btn { padding: 8px 14px; border-radius: 8px; border: 1px solid var(--accent); background: var(--accent); color: var(--on-accent); font-weight: 600; }
.btn:hover:not(:disabled) { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn.ghost { background: transparent; color: var(--accent-strong); }
.btn.ghost:hover:not(:disabled) { background: var(--accent-soft); color: var(--accent-strong); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: var(--bg); }
.btn.purple { background: var(--human); border-color: var(--human); color: var(--bg); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
select.input, textarea.input, input.input { padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface-2); color: var(--text); font: inherit; max-width: 100%; }
textarea.input { width: 100%; min-height: 120px; }
.log { list-style: none; padding: 0; margin: 0; font-size: .92rem; display: grid; gap: 6px; }
.log li { padding: 8px 12px; border-radius: 8px; background: var(--surface-2); border-left: 3px solid var(--muted); }
.log li.ok { border-color: var(--accent); }
.log li.err { border-color: var(--danger); }
.log li.ask { border-color: var(--human); }
.log li.info { border-color: var(--info); }
.log pre { margin: 6px 0 0; white-space: pre-wrap; font-size: .82rem; font-family: ui-monospace, Consolas, monospace; }
.lanes { display: grid; gap: 8px; }
.lane { display: grid; grid-template-columns: 130px 1fr 60px; gap: 10px; align-items: center; font-size: .9rem; }
.lane .track { height: 18px; background: var(--surface-2); border-radius: 6px; position: relative; overflow: hidden; border: 1px solid var(--border); }
.lane .fill { position: absolute; top: 0; bottom: 0; background: var(--accent); border-radius: 5px; transition: none; }
.lane .fill.fail { background: var(--danger); }
.route-board { display: grid; gap: 8px; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); margin-top: 12px; }
.route-board div { padding: 10px; border-radius: 10px; border: 1px solid var(--border); text-align: center; font-size: .9rem; background: var(--surface-2); }
.route-board div.hit { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-strong); font-weight: 700; }
.status { font-size: .8rem; padding: 2px 8px; border-radius: 99px; background: var(--surface-2); border: 1px solid var(--border); }
.status.run { background: var(--info-soft); color: var(--info); border-color: transparent; }
.status.ok { background: var(--accent-soft); color: var(--accent-strong); border-color: transparent; }
.status.err { background: var(--danger-soft); color: var(--danger); border-color: transparent; }
.status.wait { background: var(--human-soft); color: var(--human); border-color: transparent; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- Bottom nav ---------- */
.pager { display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; align-items: center; margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--border); }
.pager a { padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; text-decoration: none; background: var(--surface); }
.pager a small { display: block; color: var(--muted); font-size: .78rem; }
.pager .next { text-align: right; }
.pager .complete.is-done { background: var(--accent-soft); color: var(--accent-strong); }

/* ---------- Dashboard ---------- */
.hero { background: linear-gradient(135deg, var(--accent-soft), var(--surface)); border: 1px solid var(--border); border-radius: 16px; padding: clamp(18px, 4vw, 32px); }
.topic-card { display: flex; flex-direction: column; gap: 6px; }
.topic-card .icon { font-size: 1.6rem; width: 46px; height: 46px; border-radius: 12px; background: var(--accent-soft); display: grid; place-items: center; }
.topic-card p { margin: 0; color: var(--muted); flex: 1; }
.topic-card .meta { margin: 6px 0; }
.topic-card .done-badge { color: var(--accent-strong); font-weight: 700; font-size: .85rem; }
.path { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 0; list-style: none; }
.path li { display: flex; align-items: center; gap: 8px; }
.path a { padding: 6px 12px; border-radius: 99px; border: 1px solid var(--border); background: var(--surface); text-decoration: none; font-size: .9rem; }
.path a.done { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.path li:not(:last-child)::after { content: "→"; color: var(--muted); }

/* ---------- Responsive ---------- */
@media (max-width: 1180px) {
  .layout { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 860px) {
  .layout, .layout.no-toc { grid-template-columns: minmax(0, 1fr); }
  .menu-btn { display: inline-block; }
  .sidebar {
    position: fixed; left: 0; top: var(--top-h); z-index: 25; width: min(300px, 85vw);
    transform: translateX(-105%); transition: transform .2s; box-shadow: var(--shadow);
  }
  .sidebar.open { transform: none; }
  .progress-pill .label { display: none; }
  .lane { grid-template-columns: 90px 1fr 48px; }
}
@media (max-width: 560px) {
  .logo-text { display: none; }
  .topbar .progress-pill { display: none; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }
@media print { .topbar, .sidebar, .toc, .pager, .flow-tools, .code-head button { display: none !important; } .layout { display: block; } }

/* ---------- Home page / course catalog ---------- */
.home-main { max-width: 1200px; }
.muted { color: var(--muted); }
.small { font-size: .88rem; }
.eyebrow { margin: 0; font-weight: 700; color: var(--accent-strong); font-size: .85rem; letter-spacing: .04em; text-transform: uppercase; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.stats { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 10px 24px; color: var(--muted); }
.stats b { font-size: 1.4rem; color: var(--text); margin-right: 4px; }
.tag.soon { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.site-nav { display: flex; align-items: center; gap: 4px; }
.nav-link, details.menu > summary { padding: 7px 10px; border-radius: 8px; color: var(--text); text-decoration: none; font-weight: 600; font-size: .95rem; cursor: pointer; }
.nav-link:hover, details.menu > summary:hover { background: var(--surface-2); }
details.menu { position: relative; }
details.menu > summary { list-style: none; }
details.menu > summary::-webkit-details-marker { display: none; }
.site-nav details.menu > summary::after { content: " ▾"; color: var(--muted); }
.menu-panel { position: absolute; top: calc(100% + 8px); left: 0; z-index: 40; min-width: 250px; margin: 0; padding: 8px; list-style: none; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); }
.menu-panel.right { left: auto; right: 0; padding: 12px; }
.menu-panel a { display: flex; justify-content: space-between; gap: 8px; align-items: center; padding: 7px 10px; border-radius: 8px; color: var(--text); text-decoration: none; font-size: .93rem; }
.menu-panel a:hover, .menu-panel a:focus { background: var(--accent-soft); }
.menu-panel .sep { border-top: 1px solid var(--border); margin-top: 6px; padding-top: 6px; }
.menu-panel select { width: 100%; margin: 6px 0; }
.profile-menu-wrap > summary { width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid var(--border); border-radius: 50%; padding: 0; }

.tool-icon { position: relative; flex-shrink: 0; width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center; font-weight: 800; letter-spacing: .02em; background: var(--accent-soft); color: var(--accent-strong); border: 1px solid var(--border); }
.tool-icon small { position: absolute; right: -6px; bottom: -6px; font-size: .85rem; background: var(--surface); border: 1px solid var(--border); border-radius: 50%; width: 24px; height: 24px; display: grid; place-items: center; }
.avail-card { border-color: var(--accent); }
.avail-head { display: flex; gap: 14px; align-items: center; }
.avail-head h2, .avail-head h3 { margin: 0 0 4px; border: 0; padding: 0; }
.lesson-progress { height: 10px; border-radius: 99px; background: var(--surface-2); border: 1px solid var(--border); overflow: hidden; }
.lesson-progress span { display: block; height: 100%; background: var(--accent); }
.lesson-chips { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; counter-reset: l; }
.lesson-chips li { counter-increment: l; }
.lesson-chips a { display: inline-block; padding: 4px 10px; border-radius: 99px; border: 1px solid var(--border); background: var(--surface-2); font-size: .85rem; text-decoration: none; color: var(--text); }
.lesson-chips a::before { content: counter(l) ". "; color: var(--muted); }
.tiles { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.tile { display: flex; gap: 12px; align-items: center; text-align: left; padding: 14px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
.tile:hover { border-color: var(--accent); }
.tile-icon { font-size: 1.6rem; }
.tile small { display: block; color: var(--muted); }
.filters { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); align-items: end; }
.filter label { display: block; font-weight: 600; font-size: .85rem; margin-bottom: 4px; }
.filter .input { width: 100%; }
.filter.wide { grid-column: 1 / -1; }
.course-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.course-card { position: relative; display: flex; flex-direction: column; gap: 6px; }
.course-card:hover { border-color: var(--accent); }
.course-card:focus-within { outline: 3px solid var(--accent); outline-offset: 2px; }
.course-card h3 { margin: 6px 0 0; }
.course-card h3 a { color: var(--text); text-decoration: none; }
.course-card .stretch::after { content: ""; position: absolute; inset: 0; border-radius: var(--radius); }
.course-card .stretch:focus-visible { outline: none; }
.course-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.cat-label { margin: 0; font-size: .82rem; color: var(--muted); }
.course-card .desc { margin: 0; flex: 1; font-size: .93rem; }
.outcomes { margin: 0; padding-left: 1.1rem; font-size: .86rem; color: var(--muted); }
.course-card .meta { margin: 4px 0; }
.card-action { position: relative; z-index: 1; text-align: center; text-decoration: none; }
.btn.is-disabled { background: var(--surface-2); border-color: var(--border); color: var(--muted); cursor: not-allowed; }
.empty { grid-column: 1 / -1; text-align: center; }
.load-more-wrap { text-align: center; margin-top: 16px; }
.path-card h3 { margin-top: 0; }
.path-courses { list-style: none; padding: 0; margin: 0 0 12px; display: grid; gap: 4px; }
.path-courses li { display: flex; justify-content: space-between; gap: 8px; align-items: center; font-size: .92rem; padding: 4px 0; border-bottom: 1px dashed var(--border); }
.site-footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; }
dialog.course-dialog { width: min(760px, 96vw); max-height: 92vh; padding: 0 20px 20px; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); color: var(--text); }
dialog.course-dialog::backdrop { background: rgba(0,0,0,.55); }
.dialog-bar { position: sticky; top: 0; display: flex; justify-content: flex-end; padding: 12px 0 8px; background: var(--surface); z-index: 1; }
.course-dialog h3 { margin: 1.2rem 0 .3rem; }
@media (max-width: 860px) { .nav-link { display: none; } }
@media (max-width: 560px) {
  .home .logo-text { display: none; }
  .menu-panel { position: fixed; left: 8px; right: 8px; top: calc(var(--top-h) + 4px); min-width: 0; }
}