/* ─────────────────────────────────────────────
   Voyager Lab — shared course styles
   Matches the main site: dark, Syne + Space Mono,
   signal orange (#ff4d1c) + cyan (#00e5ff).
   ───────────────────────────────────────────── */

:root {
  --ink: #0a0a0f;
  --signal: #ff4d1c;
  --glow: #00e5ff;
  --mint: #7ce8a0;
  --muted: #6b6b7a;
  --text: #e8e6f0;
  --card-bg: #13131e;
  --code-bg: #0d0d16;
  --border: rgba(255, 255, 255, 0.08);
}

* , *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Syne', sans-serif;
  background: var(--ink);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ─── top bar ─── */
.course-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: rgba(10, 10, 15, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.course-nav .logo {
  font-family: 'Space Mono', monospace;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #fff;
  text-decoration: none;
  font-size: 0.95rem;
}
.course-nav .logo span { color: var(--signal); }

.course-nav .nav-links {
  display: flex;
  gap: 1.4rem;
  align-items: center;
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}
.course-nav .nav-links a { color: var(--muted); text-decoration: none; }
.course-nav .nav-links a:hover { color: var(--text); }
.course-nav .nav-links .donate {
  color: var(--ink);
  background: var(--signal);
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  font-weight: 700;
}

/* ─── layout ─── */
.wrap { max-width: 940px; margin: 0 auto; padding: 0 1.5rem; }

.course-hero {
  padding: 4rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
}
.eyebrow {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 1rem;
}
h1 {
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 1rem;
}
.lede { font-size: 1.12rem; color: #c8c6d8; max-width: 62ch; }

.badges { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.6rem; }
.badge {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: #b8b6c8;
  background: rgba(255, 255, 255, 0.03);
}
.badge.free { color: var(--mint); border-color: rgba(124, 232, 160, 0.4); }

/* ─── content ─── */
main { padding: 3rem 0 4rem; }

h2 {
  font-size: 1.7rem;
  font-weight: 700;
  color: #fff;
  margin: 2.6rem 0 1rem;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 1.18rem;
  font-weight: 700;
  color: #fff;
  margin: 2rem 0 0.7rem;
}
p { margin-bottom: 1.1rem; color: #cfcddd; }
ul, ol { margin: 0 0 1.2rem 1.3rem; color: #cfcddd; }
li { margin-bottom: 0.5rem; }
strong { color: #fff; }

.section-tag {
  display: inline-block;
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--glow);
  margin-bottom: 0.4rem;
}

/* ─── code ─── */
code {
  font-family: 'Space Mono', monospace;
  font-size: 0.86em;
  background: rgba(0, 229, 255, 0.09);
  color: #a8e9f5;
  padding: 0.12em 0.4em;
  border-radius: 4px;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--signal);
  border-radius: 8px;
  padding: 1.1rem 1.2rem;
  overflow-x: auto;
  margin: 0 0 1.4rem;
}
pre code {
  background: none;
  color: #d6e7ec;
  padding: 0;
  font-size: 0.82rem;
  line-height: 1.6;
}
.filelabel {
  font-family: 'Space Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

/* ─── callouts ─── */
.callout {
  border: 1px solid var(--border);
  border-left: 3px solid var(--glow);
  background: rgba(0, 229, 255, 0.05);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  margin: 0 0 1.4rem;
}
.callout.try {
  border-left-color: var(--mint);
  background: rgba(124, 232, 160, 0.05);
}
.callout.note { border-left-color: var(--signal); background: rgba(255, 77, 28, 0.05); }
.callout .label {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 0.4rem;
}
.callout p:last-child { margin-bottom: 0; }

/* ─── syllabus list (hub page) ─── */
.syllabus { list-style: none; margin: 0; padding: 0; }
.syllabus li { margin: 0 0 0.9rem; }
.lesson-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem 1.3rem;
  background: var(--card-bg);
  transition: border-color 0.18s, transform 0.18s;
}
.lesson-link:hover { border-color: rgba(0, 229, 255, 0.4); transform: translateY(-2px); }
.lesson-num {
  font-family: 'Space Mono', monospace;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--signal);
  min-width: 2.4rem;
}
.lesson-meta h3 { margin: 0 0 0.2rem; font-size: 1.05rem; }
.lesson-meta p { margin: 0; font-size: 0.9rem; color: var(--muted); }
.lesson-arrow { margin-left: auto; color: var(--muted); font-size: 1.3rem; }

/* ─── prev / next ─── */
.lesson-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.lesson-footer a {
  text-decoration: none;
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 0.82rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1.1rem;
  transition: border-color 0.18s;
}
.lesson-footer a:hover { border-color: rgba(0, 229, 255, 0.4); }
.lesson-footer a.next { margin-left: auto; }
.lesson-footer span.spacer { margin-left: auto; }

/* ─── progress meta on lesson pages ─── */
.lesson-progress {
  font-family: 'Space Mono', monospace;
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.7rem;
}

/* ─── donate strip ─── */
.donate-strip {
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 77, 28, 0.06), transparent);
  padding: 2.5rem 0;
  text-align: center;
}
.donate-strip h3 { margin-top: 0; }
.donate-strip p { max-width: 54ch; margin: 0 auto 1.2rem; color: #cfcddd; }
.donate-strip .btn {
  display: inline-block;
  background: var(--signal);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  padding: 0.8rem 1.6rem;
  border-radius: 8px;
}

footer.course-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  color: var(--muted);
  font-family: 'Space Mono', monospace;
  font-size: 0.74rem;
  letter-spacing: 0.04em;
}
footer.course-footer a { color: var(--muted); }

@media (max-width: 620px) {
  .course-nav { padding: 0.85rem 1rem; }
  .course-nav .nav-links { gap: 0.9rem; }
  .course-nav .nav-links a:not(.donate) { display: none; }
  .lesson-footer { flex-direction: column; }
  .lesson-footer a.next { margin-left: 0; }
}