/* Dev Journey — theme
   Every color lives in these variables. Restyle the whole site here. */

:root {
  /* "B1 terminal": same palette as chrome.css */
  --bg: #101114;
  --bg-elev: #15161a;
  --bg-elev-2: #1c1d22;
  --border: #2a2c33;
  --border-soft: #22242a;
  --text: #e8e4da;
  --text-strong: #f4f1ea;
  --muted: #a9a59b;
  --accent: #f2b24a;
  --on-accent: #101114;
  --accent-soft: rgba(242, 178, 74, 0.12);
  --good: #8fd0c5;
  --good-soft: rgba(143, 208, 197, 0.1);
  --bad: #f2867a;
  --bad-soft: rgba(242, 134, 122, 0.1);
  --warn: #f2b24a;
  --code-bg: #0a0b0d;
  --radius: 6px;
  --radius-sm: 4px;
  --font: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", "Helvetica Neue", sans-serif;
  --mono: "JetBrains Mono", "JetBrainsMono Nerd Font", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --content-width: 46rem;
  --wrap-width: 77.5rem;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--wrap-width); margin: 0 auto; padding: 0 1.25rem; }
body > main.wrap { padding-bottom: 3.5rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { color: var(--text-strong); line-height: 1.25; letter-spacing: -0.01em; font-weight: 500; }
h1 { font-weight: 600; }
h1 { font-size: 2.1rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.5rem; margin: 2.2rem 0 0.8rem; }
h3 { font-size: 1.1rem; margin: 0; }

code, pre {
  font-family: var(--mono);
  font-size: 0.88em;
}

code {
  background: var(--code-bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 0.12em 0.4em;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; border: none; padding: 0; }

/* ---------- home ---------- */
.hero { padding: 3.5rem 0 1rem; }
.hero h1 { font-size: 2.8rem; }
.tagline { color: var(--muted); font-size: 1.2rem; margin: 0.4rem 0 1rem; max-width: 40rem; }
.hero-stats { color: var(--muted); font-size: 0.95rem; }

/* home hero — mirrors the LabEx Linux Journey landing hero */
.home-hero {
  text-align: center;
  padding: 3.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-elev);
  background-size: cover;
  background-position: center;
  border-radius: var(--radius);
  margin-top: 1.5rem;
}
.home-hero-img { width: 220px; height: auto; margin-bottom: 1.2rem; }
.home-hero h1 { font-size: 2.8rem; margin: 0; }
.home-hero .tagline { margin: 0.5rem auto 0.6rem; }
.home-hero-sub { margin: 0 0 0.9rem; font-size: 0.92rem; }
.home-hero-sub a { color: var(--accent); }

.home-about { margin: 2.5rem 0 1rem; }
.home-about h2 { margin-bottom: 0.5rem; }
.home-about p { color: var(--muted); max-width: 52rem; line-height: 1.6; }

.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 1rem;
}
.pillar {
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.1rem;
}
.pillar h3 { margin: 0 0 0.4rem; }
.pillar p { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.5; }

/* ---------- CTA buttons (mirror LabEx) ---------- */
.cta-btn {
  display: inline-block;
  background: var(--good);
  color: var(--on-accent);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1.6rem;
  font-weight: 700;
  font-size: 0.98rem;
  border: 1px solid var(--good);
  text-decoration: none;
  transition: filter 0.15s, transform 0.15s;
}
.cta-btn:hover { filter: brightness(1.12); transform: translateY(-1px); text-decoration: none; }
.cta-btn.ghost { background: transparent; color: var(--text); border-color: var(--border); }
.cta-btn.ghost:hover { border-color: var(--accent); color: var(--accent); }
.cta-btn.small { padding: 0.35rem 1rem; font-size: 0.85rem; }

/* ---------- main hero ---------- */
.main-hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 2rem;
  align-items: center;
  padding: 2.5rem 0 1.5rem;
}
.main-hero h1 { font-size: 2.6rem; margin: 0 0 0.6rem; }
.main-hero-sub { color: var(--muted); font-size: 1.05rem; margin: 0 0 1.4rem; max-width: 36rem; line-height: 1.55; }
.main-hero-ctas { display: flex; gap: 0.9rem; flex-wrap: wrap; }
.main-hero-img { width: 100%; border-radius: var(--radius); border: 1px solid var(--border); }

/* ---------- steps ---------- */
.steps { margin: 2.5rem 0; }
.steps h2, .features h2, .skills h2, .certs h2, .stats h2 { margin-bottom: 0.4rem; }
.step-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.step {
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1rem;
  position: relative;
}
.step img { width: 100%; border-radius: var(--radius-sm); margin-bottom: 0.8rem; }
.step-num {
  position: absolute;
  top: 1.25rem;
  left: 1.25rem;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 700;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step h3 { margin: 0 0 0.3rem; }
.step p { margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.5; }

/* ---------- features ---------- */
.features { margin: 2.5rem 0; }
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
  margin: 1.6rem 0;
}
.feature.flip > img { order: 2; }
.feature img { width: 100%; border-radius: var(--radius); border: 1px solid var(--border); }
.feature h3 { margin: 0 0 0.5rem; }
.feature p { color: var(--muted); line-height: 1.6; margin: 0 0 0.6rem; }
.text-link { color: var(--accent); font-weight: 600; }

/* ---------- skill trees ---------- */
.skills { margin: 2.5rem 0; }
.skill-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.skill-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.2rem;
  color: var(--text);
  text-align: center;
  transition: border-color 0.15s, transform 0.15s;
}
.skill-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.skill-card img { width: 72px; height: 72px; object-fit: contain; margin-bottom: 0.7rem; }
.skill-card h3 { margin: 0 0 0.35rem; }
.skill-card p { margin: 0 0 0.6rem; color: var(--muted); font-size: 0.88rem; line-height: 1.5; }
.planned-badge {
  display: inline-block;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: var(--radius-sm);
  padding: 0.1rem 0.7rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---------- certs ---------- */
.certs { margin: 2.5rem 0; }
.cert-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.cert-group {
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.2rem;
}
.cert-vendor {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
}
.cert-group h3 { margin: 0 0 0.35rem; }
.cert-group p { margin: 0 0 0.9rem; color: var(--muted); font-size: 0.88rem; line-height: 1.5; }
.cert-pills { display: flex; flex-wrap: wrap; gap: 0.5rem; }

/* ---------- stats ---------- */
.stats { margin: 3rem 0 2rem; text-align: center; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
}
.stat { background: var(--bg-elev); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 1.2rem 0.8rem; }
.stat-num { display: block; font-size: 2rem; font-weight: 700; color: var(--accent); }
.stat-label { color: var(--muted); font-size: 0.9rem; }

/* ---------- CTA band ---------- */
.cta-band {
  text-align: center;
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  margin: 2.5rem 0 2rem;
}
.cta-band h2 { margin: 0 0 0.4rem; }
.cta-band p { color: var(--muted); margin: 0 0 1.4rem; }

/* ---------- card start affordance ---------- */
.card-start {
  display: inline-block;
  margin-top: 0.2rem;
  color: var(--good);
  font-weight: 700;
  font-size: 0.9rem;
}
.course-card:hover .card-start { text-decoration: underline; }

.playground-card-main { display: block; color: var(--text); }
.playground-card-main:hover { text-decoration: none; }
.playground-card-main h3 { color: var(--text-strong); }
.playground-card .cta-btn { margin-top: 0.2rem; }

.rank { margin: 2.5rem 0 3.5rem; }
.rank-blurb { color: var(--muted); margin: 0 0 1.4rem; }

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.course-card {
  display: flex;
  gap: 0.9rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  color: var(--text);
  transition: border-color 0.15s, transform 0.15s;
}
.course-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.course-card-img { width: 64px; height: 64px; border-radius: var(--radius-sm); object-fit: contain; flex-shrink: 0; }
.course-card-body { display: flex; flex-direction: column; gap: 0.25rem; min-width: 0; }
.course-card-body p { margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.45; }
.course-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  font-size: 0.8rem;
  color: var(--muted);
  padding-top: 0.5rem;
}
.course-pct { color: var(--good); font-weight: 600; }

.progress-bar {
  height: 5px;
  background: var(--border-soft);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--good);
  border-radius: 3px;
  transition: width 0.3s;
}

/* ---------- course page ---------- */
.breadcrumbs { margin: 1.4rem 0 1.2rem; color: var(--muted); font-size: 0.9rem; }
.breadcrumbs span { margin: 0 0.35rem; }

.page-head { display: flex; gap: 1.2rem; align-items: center; margin-bottom: 1rem; }
.course-head-img { width: 84px; height: 84px; object-fit: contain; flex-shrink: 0; }
.lede { color: var(--muted); margin: 0; max-width: 40rem; }

.course-progress { margin: 1.2rem 0 0.4rem; max-width: 36rem; }
.course-progress-text { color: var(--muted); font-size: 0.85rem; margin: 0.4rem 0 0; }

.lesson-list { list-style: none; padding: 0; margin: 1rem 0 0; }
.lesson-row { border-bottom: 1px solid var(--border-soft); }
.lesson-row:first-child { border-top: 1px solid var(--border-soft); }
.lesson-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 0.6rem;
  color: var(--text);
  border-radius: var(--radius-sm);
}
.lesson-link:hover { background: var(--bg-elev); text-decoration: none; }
.lesson-num { color: var(--muted); font-family: var(--mono); font-size: 0.85rem; flex-shrink: 0; }
.lesson-text { display: flex; flex-direction: column; gap: 0.1rem; min-width: 0; }
.lesson-title { font-weight: 600; color: var(--text-strong); }
.lesson-desc { color: var(--muted); font-size: 0.88rem; }
.lesson-check { color: var(--good); font-weight: 700; margin-left: auto; flex-shrink: 0; }
.lesson-row.is-complete .lesson-num { color: var(--good); }

.faq { border: 1px solid var(--border-soft); border-radius: var(--radius-sm); margin: 0.5rem 0; background: var(--bg-elev); }
.faq summary { padding: 0.7rem 0.9rem; cursor: pointer; font-weight: 600; color: var(--text-strong); }
.faq p { padding: 0 0.9rem 0.8rem; margin: 0; color: var(--muted); }

/* ---------- lesson page ---------- */
.page-lesson main { max-width: var(--content-width); }
.page-lesson .wrap { max-width: var(--content-width); }

.lesson { padding-bottom: 3rem; }
.lesson-head { margin: 1rem 0 1.6rem; }
.lesson-kicker { color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; margin: 0 0 0.3rem; }
.lesson-progress { color: var(--muted); font-size: 0.9rem; margin: 0.6rem 0 0; }

.lesson-body h2 { font-size: 1.35rem; margin-top: 2.4rem; }
.lesson-body p { margin: 0.9rem 0; }
.lesson-body ul, .lesson-body ol { padding-left: 1.4rem; }
.lesson-body li { margin: 0.35rem 0; }
.lesson-body blockquote {
  border-left: 3px solid var(--accent);
  margin: 1.2rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  color: var(--muted);
}

/* quiz */
.quiz {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  margin: 1.6rem 0;
}
.quiz-question {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  margin: 0 0 0.9rem;
  font-weight: 600;
  color: var(--text-strong);
}
.quiz-badge {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15em 0.7em;
  white-space: nowrap;
  flex-shrink: 0;
}
.quiz-options { display: flex; flex-direction: column; gap: 0.5rem; }
.quiz-option {
  text-align: left;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.98rem;
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}
.quiz-option:hover { border-color: var(--accent); background: var(--bg-elev); }
.quiz-option.picked { pointer-events: none; }
.quiz-option.picked.is-correct, .quiz-option.picked:not(.wrong) {
  border-color: var(--good);
  background: var(--good-soft);
  color: var(--text-strong);
}
.quiz-option.picked.wrong {
  border-color: var(--bad);
  background: var(--bad-soft);
}
.quiz-option.reveal-correct { border-color: var(--good); }
.quiz-feedback {
  margin: 0.9rem 0 0;
  padding: 0.7rem 0.9rem;
  background: var(--bg-elev-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-soft);
  font-size: 0.92rem;
  color: var(--muted);
}
.fb-ok { color: var(--good); font-weight: 700; }
.fb-bad { color: var(--bad); font-weight: 700; }
.fb-correct-answer { display: block; margin-top: 0.4rem; }

/* completion + nav */
.lesson-complete {
  margin: 2.2rem 0;
  padding: 1.2rem 1.4rem;
  border: 1px solid var(--good);
  background: var(--good-soft);
  border-radius: var(--radius);
}
.lesson-complete h2 { margin: 0 0 0.4rem; color: var(--good); font-size: 1.2rem; }
.lesson-complete p { margin: 0; color: var(--text); }

.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
}
.lesson-nav a {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.9rem;
  font-size: 0.92rem;
  color: var(--text);
  max-width: 48%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.lesson-nav a:hover { border-color: var(--accent); text-decoration: none; }


/* ---------- AI tutor chat widget ---------- */
.chat-fab {
  position: fixed;
  right: 1.1rem;
  bottom: 1.1rem;
  z-index: 30;
  width: 3.3rem;
  height: 3.3rem;
  border-radius: 50%;
  background: var(--bg-elev);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 700;
  font-family: var(--mono);
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
  transition: transform 0.15s;
}
.chat-fab:hover { transform: scale(1.06); }

.chat-panel {
  position: fixed;
  right: 1.1rem;
  bottom: 5rem;
  z-index: 30;
  width: 22rem;
  max-width: calc(100vw - 2.2rem);
  height: min(28rem, calc(100vh - 7rem));
  display: flex;
  flex-direction: column;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}
.chat-panel[hidden] { display: none; }
.chat-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--border-soft);
  font-weight: 600;
  color: var(--text-strong);
}
.chat-close {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.25rem;
  cursor: pointer;
  line-height: 1;
  padding: 0 0.2rem;
}
.chat-close:hover { color: var(--text); }
.chat-msgs {
  flex: 1;
  overflow-y: auto;
  padding: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.chat-msg {
  max-width: 85%;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-soft);
  align-self: flex-start;
}
.chat-msg-user {
  align-self: flex-end;
  background: var(--accent-soft);
  border-color: var(--accent);
}
.chat-msg.chat-error {
  background: var(--bad-soft);
  border-color: var(--bad);
}
.chat-status {
  margin: 0;
  padding: 0.4rem 0.9rem;
  font-size: 0.82rem;
  color: var(--warn);
  border-top: 1px solid var(--border-soft);
}
.chat-form {
  display: flex;
  gap: 0.5rem;
  padding: 0.6rem;
  border-top: 1px solid var(--border-soft);
}
.chat-input {
  flex: 1;
  min-width: 0;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.7rem;
  font-size: 0.92rem;
  font-family: var(--font);
}
.chat-input:focus { outline: none; border-color: var(--accent); }
.chat-send {
  background: var(--accent);
  color: var(--on-accent);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0 0.9rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font);
}

/* ---------- practice links ---------- */
.practice-area { margin: 0.9rem 0 0; }
.practice-link {
  display: inline-block;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.9rem;
  font-size: 0.88rem;
}
.practice-link:hover { border-color: var(--accent); text-decoration: none; }

/* ---------- inline practice terminal (same-page VM) ---------- */
.practice-panel { margin: 0.9rem 0 0; }
.practice-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.practice-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
}
.practice-toggle:hover,
.practice-toggle.is-open { border-color: var(--accent); }
.practice-toggle-sub { font-size: 0.75rem; font-weight: 400; color: var(--muted); }
.practice-frame-wrap {
  margin-top: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #000;
}
.practice-frame {
  display: block;
  width: 100%;
  height: 480px;
  border: 0;
}

/* ---------- practice task + work check ---------- */
.practice-task {
  margin-top: 0.75rem;
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--accent);
  background: var(--bg-elev);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
}
.practice-task h3 { margin: 0 0 0.4rem; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.practice-task-text { margin: 0; white-space: pre-line; font-family: var(--font); }
.practice-task-hint { margin: 0.4rem 0 0; font-size: 0.82rem; color: var(--muted); }
.practice-checkbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}
.practice-check {
  border: 1px solid var(--good);
  background: var(--good-soft);
  color: var(--good);
  border-radius: var(--radius-sm);
  padding: 0.4rem 1.1rem;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}
.practice-check:hover:not(:disabled) { background: var(--good); color: var(--on-accent); }
.practice-check:disabled { opacity: 0.55; cursor: default; }
.practice-check-status { font-size: 0.88rem; }
.practice-check-status.is-pass { color: var(--good); }
.practice-check-status.is-warn { color: var(--warn); }

/* ---------- quiz keyboard hint ---------- */
.quiz-hint { margin: -0.5rem 0 0.8rem; font-size: 0.75rem; color: var(--muted); }
.quiz-hint[hidden] { display: none; }

/* ---------- lesson player (mirrors the original step-through) ---------- */
.lesson-pct { margin: 0.5rem 0 0; color: var(--muted); font-size: 0.9rem; font-weight: 600; }
.lesson-steps { margin-top: 1rem; }
.ls-step { margin-top: 1rem; padding-top: 0.9rem; border-top: 1px solid var(--border-soft); }
.ls-step[hidden] { display: none; }
.ls-step-quiz {
  background: var(--bg-elev);
  border: 1px solid var(--border-soft);
  border-top: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 1rem 1rem 0.2rem;
  margin-top: 1.2rem;
}
.ls-step-practice { margin-top: 1.2rem; }
.lesson-player-nav { margin: 1.2rem 0; display: flex; align-items: center; gap: 0.9rem; flex-wrap: wrap; }
.ls-continue {
  background: var(--accent);
  color: var(--on-accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.6rem 2.1rem;
  font-weight: 700;
  font-size: 0.98rem;
  font-family: var(--font);
  cursor: pointer;
  transition: filter 0.15s;
}
.ls-continue:hover:not(:disabled) { filter: brightness(1.15); }
.ls-continue:disabled { opacity: 0.6; cursor: default; }
.ls-gate-hint { color: var(--warn); font-size: 0.9rem; }

/* ---------- two-panel lab layout (mirrors the original lab page) ---------- */
.lab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 1.4rem;
  align-items: start;
  margin-top: 1rem;
}
.lab-vm { position: sticky; top: 4.5rem; }
.lab-vm-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  padding: 0.5rem 0.9rem;
  font-size: 0.85rem;
}
.lab-vm-title { font-weight: 700; color: var(--text-strong); }
.lab-vm-status { color: var(--muted); }
.lab-vm-boot {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  padding: 0.9rem 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.lab-vm-boot[hidden] { display: none; }
.boot-line { display: flex; gap: 0.5rem; padding: 0.15rem 0; }
.boot-line.done { color: var(--text); }
.boot-line.done .boot-check { color: var(--good); }
.boot-check { display: inline-block; width: 1.1em; }
.lab-vm-screen {
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  overflow: hidden;
  background: #000;
}
.lab-vm-screen .practice-frame { display: block; width: 100%; height: 460px; border: 0; }
.lab-vm-hint { color: var(--muted); font-size: 0.82rem; margin: 0.5rem 0 0; }

.lab-guide { min-width: 0; }
.lab-guide .ls-step { border-top: none; margin-top: 0; padding-top: 0; }

/* ---------- practice step + inspect card ---------- */
.ls-step-practice h3 { text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.85rem; color: var(--muted); margin: 0 0 0.4rem; }
.practice-task-text { margin: 0 0 0.5rem; white-space: pre-line; line-height: 1.55; }
.practice-task-hint { margin: 0; color: var(--muted); font-size: 0.85rem; }
.practice-ok { color: var(--good); font-weight: 600; margin: 0.6rem 0 0; }
.inspect-card {
  margin-top: 0.9rem;
  border: 1px solid var(--bad);
  border-left: 4px solid var(--bad);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  padding: 0.9rem 1rem;
}
.inspect-card[hidden] { display: none; }
.inspect-card.is-pass { border-color: var(--good); border-left-color: var(--good); }
.inspect-head { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; margin-bottom: 0.4rem; }
.inspect-ico { color: var(--bad); }
.inspect-card.is-pass .inspect-ico { color: var(--good); }
.inspect-result { margin: 0 0 0.7rem; color: var(--text); font-size: 0.92rem; line-height: 1.5; }
.inspect-actions { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.inspect-btn {
  background: var(--accent);
  color: var(--on-accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.4rem 1.1rem;
  font-weight: 700;
  font-size: 0.88rem;
  font-family: var(--font);
  cursor: pointer;
}
.inspect-btn:hover { filter: brightness(1.12); }
.inspect-btn:disabled { opacity: 0.55; cursor: default; }
.inspect-btn.ghost { background: transparent; color: var(--text); border-color: var(--border); }
.inspect-btn.ghost:hover { border-color: var(--accent); color: var(--accent); }
.inspect-deep-out {
  margin-top: 0.8rem;
  border-top: 1px solid var(--border-soft);
  padding-top: 0.7rem;
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.55;
  white-space: pre-wrap;
}
.inspect-deep-out[hidden] { display: none; }

@media (max-width: 860px) {
  .lab-layout { grid-template-columns: 1fr; }
  .lab-vm { position: static; }
}

/* ---------- playgrounds page ---------- */
.playground-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.playground-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
  color: var(--text);
  display: block;
  transition: border-color 0.15s, transform 0.15s;
}
.playground-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.playground-card img { width: 44px; height: 44px; object-fit: contain; margin-bottom: 0.6rem; }
.playground-card h3 { margin-bottom: 0.4rem; }
.playground-card p { margin: 0 0 0.6rem; color: var(--muted); font-size: 0.9rem; }
.playground-port { font-family: var(--mono); font-size: 0.78rem; color: var(--accent); }

/* ---------- home: distros + books ---------- */
.distro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.6rem;
}
.distro-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  color: var(--text);
  font-weight: 600;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.distro-card img { width: 22px; height: 22px; object-fit: contain; flex-shrink: 0; }
.distro-card:hover { border-color: var(--accent); text-decoration: none; }

.book-list {
  list-style: none;
  padding: 0;
  margin: 0.6rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.book-list li { display: flex; flex-wrap: wrap; gap: 0 0.5rem; align-items: baseline; }
.book-note { color: var(--muted); font-size: 0.88rem; }

/* ---------- search page ---------- */
.search-page { padding-bottom: 2rem; }
.search-page h1 { margin-top: 1.6rem; }
.search-input-big {
  width: 100%;
  max-width: 34rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  font-size: 1.05rem;
  margin: 1rem 0 0.2rem;
  font-family: var(--font);
}
.search-input-big:focus { outline: none; border-color: var(--accent); }
.search-meta { color: var(--muted); font-size: 0.85rem; margin: 0 0 1rem; }
.search-results { list-style: none; padding: 0; margin: 0; }
.search-result { border-bottom: 1px solid var(--border-soft); }
.search-result:first-child { border-top: 1px solid var(--border-soft); }
.search-result a { display: block; padding: 0.8rem 0.5rem; color: var(--text); border-radius: var(--radius-sm); }
.search-result a:hover { background: var(--bg-elev); text-decoration: none; }
.search-result-title { font-weight: 600; color: var(--text-strong); }
.search-result-course { color: var(--accent); font-size: 0.8rem; margin-left: 0.5rem; }
.search-result-desc { color: var(--muted); font-size: 0.88rem; margin: 0.15rem 0 0; }
.search-empty { color: var(--muted); padding: 2rem 0; }

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .hero h1 { font-size: 2.1rem; }
  .page-head { flex-direction: column; align-items: flex-start; }
  .lesson-nav { flex-direction: column; }
  .lesson-nav a { max-width: 100%; }
  .chat-panel { right: 0.6rem; bottom: 4.6rem; width: calc(100vw - 1.2rem); max-width: none; }
  .chat-fab { right: 0.6rem; bottom: 0.6rem; }
}

/* ---------- labs catalog + course pages (the lab player itself is lab.css) ---------- */
.lab-course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; margin: 1.5rem 0 3rem; }
.lab-course-card {
  display: block; padding: 1.2rem 1.3rem; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-elev); color: var(--text);
}
.lab-course-card:hover { border-color: var(--accent); text-decoration: none; }
.lab-course-card h2 { margin: 0 0 0.4rem; font-size: 1.2rem; }
.lab-course-card p { margin: 0 0 0.8rem; color: var(--muted); }
.lab-card-meta { font-size: 0.8rem; color: var(--muted); text-transform: capitalize; }
.lab-list { display: grid; gap: 0.75rem; margin: 1.5rem 0 3rem; }
.lab-card {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1rem;
  padding: 1rem 1.2rem; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-elev); color: var(--text);
}
.lab-card:hover { border-color: var(--accent); text-decoration: none; }
.lab-card-num {
  display: grid; place-items: center; width: 2.2rem; height: 2.2rem; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent); font-weight: 700;
}
.lab-card.is-done .lab-card-num { background: var(--good-soft); color: var(--good); }
.lab-card-body { display: grid; gap: 0.2rem; min-width: 0; }
.lab-card-kind { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent); }
.lab-card-kind.lab-kind-challenge { color: var(--warn); }
.lab-card-title { color: var(--text-strong); font-size: 1.05rem; }
.lab-card-desc { color: var(--muted); font-size: 0.9rem; }
.lab-card-status { font-size: 0.85rem; font-weight: 600; color: var(--accent); white-space: nowrap; }
.lab-card.is-done .lab-card-status { color: var(--good); }
@media (max-width: 600px) {
  .lab-card { grid-template-columns: auto 1fr; }
  .lab-card-status { grid-column: 2; }
}

/* lab course reference page + link (docs/courses/standard.md rule 7) */
.lab-ref-link { font-family: var(--mono); font-size: 0.88rem; }
.lab-reference table { width: 100%; border-collapse: collapse; margin: 0.8rem 0 1.6rem; font-size: 0.92rem; }
.lab-reference th, .lab-reference td { text-align: left; padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.lab-reference th { color: var(--muted); font-weight: 500; font-family: var(--mono); font-size: 0.8rem; }

/* ---------- account page (account.mjs / account.js) ---------- */
.acct { max-width: 46rem; margin: 2.5rem auto 4rem; display: grid; gap: 1.25rem; }
.acct-panel { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.acct-panel .ln-strip a { color: var(--muted); }
.acct-body { padding: 1.4rem 1.5rem; }
.acct h1 { margin: 0 0 0.4rem; font-size: 1.6rem; }
.acct-lede { margin: 0 0 1.4rem; color: var(--muted); }
.acct-small { margin: 0.2rem 0; color: var(--muted); font-size: 0.88rem; }
.acct-error { margin: 0; padding: 0.75rem 1rem; border: 1px solid var(--bad); border-radius: var(--radius-sm); background: var(--bad-soft); color: var(--bad); }
.acct-error[hidden] { display: none; }
.acct-signins { display: grid; gap: 0.6rem; max-width: 22rem; margin-bottom: 1rem; }
.acct-signin {
  display: flex; align-items: center; gap: 0.75rem; min-height: 46px; padding: 0 1rem;
  border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg); color: var(--text); font-weight: 500;
}
.acct-signin:hover { border-color: var(--muted); text-decoration: none; }
.acct-signin.is-off { opacity: 0.5; cursor: default; }
.acct-signin.is-off:hover { border-color: var(--border); }
.acct-me { display: flex; gap: 1.2rem; align-items: flex-start; }
.acct-initial {
  flex: none; display: grid; place-items: center; width: 52px; height: 52px; border-radius: var(--radius-sm);
  background: var(--accent); color: var(--on-accent); font: 700 1.4rem var(--mono);
}
.acct-links { display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; margin-top: 0.6rem; font-size: 0.9rem; }
.acct-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin-bottom: 1.2rem; }
.acct-table th { text-align: left; font: 500 0.78rem var(--mono); color: var(--muted); padding: 0 0.6rem 0.5rem; border-bottom: 1px solid var(--border); }
.acct-table td { padding: 0.6rem; border-bottom: 1px solid var(--border-soft); vertical-align: middle; }
.acct-table td.ln-ascii { font-size: 0.8rem; white-space: normal; color: var(--good); }
.acct-table td:last-child { text-align: right; white-space: nowrap; }
.acct-table[hidden], .acct-small[hidden] { display: none; }
.acct-danger { border-top: 1px solid var(--border); padding-top: 1rem; }
.acct-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.acct-btn {
  min-height: 40px; padding: 0 1rem; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: transparent; color: var(--text); font: inherit; font-size: 0.9rem; cursor: pointer;
}
.acct-btn:hover { border-color: var(--muted); }
.acct-btn.is-danger { color: var(--bad); border-color: rgba(242, 134, 122, 0.45); }
.acct-btn.is-danger:hover { border-color: var(--bad); }
.acct-btn.is-small { min-height: 32px; padding: 0 0.7rem; font-size: 0.82rem; }
.acct-btn.is-quiet { color: var(--muted); }
.acct-btn:disabled { opacity: 0.5; cursor: default; }
.acct-confirm { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; font-size: 0.85rem; color: var(--text); white-space: normal; justify-content: flex-end; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
@media (max-width: 560px) { .acct-me { flex-direction: column; } }