/* PawWalk Academy — same "Subtle HUD" tokens as the iOS app (Theme/Brand.swift) */
:root {
  --canvas: #F5F3FA;
  --canvas-deep: #E7E4F2;
  --card: #FFFFFF;
  --ink: #171327;
  --ink-soft: rgba(23, 19, 39, 0.62);
  --accent: #5B4BE0;
  --accent-soft: rgba(91, 75, 224, 0.12);
  --green: #4A7A5E;
  --green-soft: rgba(74, 122, 94, 0.14);
  --amber: #C68A1E;
  --amber-soft: rgba(198, 138, 30, 0.13);
  --red: #B3453E;
  --red-soft: rgba(179, 69, 62, 0.12);
  --line: rgba(23, 19, 39, 0.10);
  --code-bg: #1C1636;
  --code-ink: #ECEAF7;
  --sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #0E0A1C;
    --canvas-deep: #1C1636;
    --card: #191331;
    --ink: #ECEAF7;
    --ink-soft: rgba(236, 234, 247, 0.62);
    --accent: #8E7DFF;
    --accent-soft: rgba(142, 125, 255, 0.16);
    --green: #9FD3C0;
    --green-soft: rgba(159, 211, 192, 0.14);
    --amber: #E3B25E;
    --amber-soft: rgba(227, 178, 94, 0.14);
    --red: #E08A84;
    --red-soft: rgba(224, 138, 132, 0.14);
    --line: rgba(236, 234, 247, 0.12);
    --code-bg: #07050F;
    --code-ink: #ECEAF7;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

.layout { display: flex; min-height: 100vh; }

/* ---------- Sidebar ---------- */
#sidebar {
  width: 320px;
  flex-shrink: 0;
  border-right: 1px solid var(--line);
  background: var(--canvas-deep);
  padding: 24px 18px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.brand { margin-bottom: 18px; }
.brand-row { display: flex; align-items: center; gap: 10px; }
.paw { font-size: 26px; }
.brand h1 { font-size: 19px; margin: 0; letter-spacing: -0.01em; }
.mono-caption {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.brand .mono-caption { display: block; margin-top: 4px; }
.overall { margin-top: 14px; display: flex; align-items: center; gap: 10px; }
.bar { flex: 1; height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
.bar > div { height: 100%; width: 0%; background: var(--accent); border-radius: 3px; transition: width 0.4s ease; }

/* Sidebar search */
.search-input {
  width: 100%; margin-bottom: 12px;
  background: var(--card); color: var(--ink);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 9px 12px; font: 500 13.5px var(--sans);
}
.search-input::placeholder { color: var(--ink-soft); }
.search-input:focus { outline: none; border-color: var(--accent); }
.search-result {
  display: block; padding: 9px 10px; margin-bottom: 4px; border-radius: 10px;
  color: var(--ink); text-decoration: none; font-size: 13.5px; font-weight: 600;
}
.search-result:hover { background: var(--accent-soft); }
.search-result .mono-caption { margin: 2px 0; }
.search-snippet { font-size: 12.5px; font-weight: 400; color: var(--ink-soft); }

/* Overall links row: Map + Review badge */
.overall-links { display: flex; align-items: center; gap: 14px; margin-top: 8px; }
.overall-links a { text-decoration: none; }
.overall-links a:hover { color: var(--accent); }
.review-badge { color: var(--amber); }

#module-list { flex: 1; }
.mod { margin-bottom: 6px; }
.mod-head {
  display: flex; align-items: center; gap: 9px;
  width: 100%; text-align: left;
  padding: 9px 10px; border: 0; border-radius: 10px;
  background: transparent; color: var(--ink);
  font: 600 14px var(--sans); cursor: pointer;
}
.mod-head:hover { background: var(--accent-soft); }
.mod-head .emoji { width: 20px; text-align: center; }
.mod-head .count { margin-left: auto; font-family: var(--mono); font-size: 10px; color: var(--ink-soft); }
.mod-head .count.done { color: var(--green); }
.mod-lessons { display: none; padding-left: 14px; }
.mod.open .mod-lessons { display: block; }
.lesson-link {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 10px; border-radius: 8px;
  color: var(--ink-soft); text-decoration: none; font-size: 13.5px;
}
.lesson-link:hover { background: var(--accent-soft); color: var(--ink); }
.lesson-link.active { background: var(--accent); color: #fff; }
.lesson-link .tick { width: 15px; font-size: 11px; color: var(--green); }
.lesson-link.active .tick { color: #fff; }
.lesson-link .est { margin-left: auto; font-family: var(--mono); font-size: 10.5px; color: var(--ink-soft); opacity: 0.75; }
.lesson-link.active .est { color: #fff; }
.side-foot { padding-top: 14px; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 8px; }
.ghost {
  background: none; border: 1px solid var(--line); border-radius: 8px;
  color: var(--ink-soft); font: 500 12px var(--sans);
  padding: 7px 12px; cursor: pointer;
}
.ghost:hover { border-color: var(--red); color: var(--red); }

#menu-toggle { display: none; }

/* ---------- Content ---------- */
#content { flex: 1; padding: 44px 40px 120px; min-width: 0; }
.lesson-wrap { max-width: 760px; margin: 0 auto; }
.crumbs { margin-bottom: 6px; }
.crumb-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.lesson-reset { font-size: 11.5px; color: var(--ink-soft); opacity: 0.75; white-space: nowrap; }
.lesson-title { font-size: 32px; margin: 0 0 26px; letter-spacing: -0.02em; line-height: 1.2; }

.step { margin-bottom: 26px; animation: rise 0.35s ease; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.step h3 { font-size: 21px; margin: 30px 0 10px; letter-spacing: -0.01em; }
.step h4 { font-size: 17px; margin: 22px 0 8px; }
.step p { margin: 0 0 14px; }
.step ul, .step ol { margin: 0 0 14px; padding-left: 24px; }
.step li { margin-bottom: 5px; }
.step blockquote {
  margin: 0 0 14px; padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft); border-radius: 0 10px 10px 0;
}
.step blockquote p { margin: 0; }
.step code {
  font-family: var(--mono); font-size: 0.86em;
  background: var(--accent-soft); border-radius: 5px; padding: 1.5px 5px;
}
.step a { color: var(--accent); }

/* Code blocks */
.codeblock { margin: 0 0 16px; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); }
pre.md-code {
  margin: 0 0 16px; padding: 14px 16px; overflow-x: auto;
  background: var(--code-bg); color: var(--code-ink);
  font-family: var(--mono); font-size: 13.5px; line-height: 1.6;
  border-radius: 14px; border: 1px solid var(--line);
}
.codeblock .code-title {
  display: flex; align-items: center; gap: 8px;
  background: var(--canvas-deep); padding: 8px 14px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-soft);
}
.codeblock .code-title.code-title-run { justify-content: flex-end; }
.codeblock pre {
  margin: 0; padding: 16px 18px; overflow-x: auto;
  background: var(--code-bg); color: var(--code-ink);
  font-family: var(--mono); font-size: 13.5px; line-height: 1.6;
}
.run-btn {
  margin-left: auto; border: 1px solid var(--line); border-radius: 7px;
  background: transparent; color: var(--ink-soft);
  font: 600 11px var(--mono); letter-spacing: 0.04em; text-transform: none;
  padding: 4px 10px; cursor: pointer;
}
.run-btn:hover { color: var(--accent); border-color: var(--accent); }
.run-out {
  margin: 0; padding: 12px 16px; max-height: 200px; overflow: auto;
  background: var(--canvas-deep); color: var(--ink);
  font-family: var(--mono); font-size: 12.5px; line-height: 1.5;
  border: 1px solid var(--line); border-top: 0; border-radius: 0 0 14px 14px;
  white-space: pre-wrap; word-break: break-word;
}
.run-out.err { color: var(--red); background: var(--red-soft); }
.card .run-out { border-radius: 10px; border-top: 1px solid var(--line); margin-top: 12px; }
.tok-kw { color: #FF7AB2; }
.tok-str { color: #A8E5A3; }
.tok-num { color: #E3B25E; }
.tok-type { color: #8AD1F5; }
.tok-attr { color: #C79DFF; }
.tok-com { color: #8B86A8; font-style: italic; }

/* Cards: quiz / exercise / xcode */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 22px; margin-bottom: 16px;
}
.card.done { border-color: var(--green); }
.card-tag { margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.card-tag .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); position: relative; }
.card.done .card-tag .dot { background: var(--green); }
.card-tag .dot::after {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  background: inherit; animation: pulse 1.9s ease-out infinite;
}
.card.done .card-tag .dot::after { animation: none; }
@keyframes pulse { from { transform: scale(1); opacity: 0.4; } to { transform: scale(2.4); opacity: 0; } }
.card h4 { margin: 0 0 10px; font-size: 17px; }

/* Review (spaced repetition) */
.review-context { margin: 0 0 10px; }

/* Quiz */
.choices { display: flex; flex-direction: column; gap: 9px; margin-top: 12px; }
.choice {
  text-align: left; padding: 12px 16px;
  border: 1.5px solid var(--line); border-radius: 12px;
  background: transparent; color: var(--ink);
  font: 500 15px var(--sans); cursor: pointer; transition: border-color 0.15s;
}
.choice:hover:not(:disabled) { border-color: var(--accent); }
.choice.correct { border-color: var(--green); background: var(--green-soft); }
.choice.wrong { border-color: var(--red); background: var(--red-soft); animation: shake 0.3s; }
.choice:disabled { cursor: default; opacity: 0.85; }
@keyframes shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }

/* Exercise */
.editor {
  width: 100%; min-height: 120px; resize: vertical;
  background: var(--code-bg); color: var(--code-ink);
  border: 1.5px solid var(--line); border-radius: 12px;
  padding: 14px 16px; font-family: var(--mono); font-size: 13.5px; line-height: 1.6;
  tab-size: 4; white-space: pre; overflow-x: auto;
}
.editor:focus { outline: none; border-color: var(--accent); }
.ex-actions { display: flex; align-items: center; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.btn {
  border: 0; border-radius: 10px; padding: 10px 20px;
  background: var(--accent); color: #fff;
  font: 600 14px var(--sans); cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.45; cursor: default; filter: none; }
.btn.secondary { background: transparent; color: var(--ink-soft); border: 1px solid var(--line); }
.btn.secondary:hover { color: var(--ink); border-color: var(--ink-soft); }
.linkish { background: none; border: 0; color: var(--ink-soft); font: 500 13px var(--sans); cursor: pointer; text-decoration: underline; }
.linkish:hover { color: var(--accent); }

.feedback { margin-top: 12px; padding: 12px 16px; border-radius: 10px; font-size: 14.5px; }
.feedback.ok { background: var(--green-soft); color: var(--green); font-weight: 600; }
.feedback.bad { background: var(--amber-soft); }
.feedback.bad .fb-label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--amber); display: block; margin-bottom: 3px; }
.solution-reveal { margin-top: 14px; }

/* Xcode checklist */
.card.xcode { border-left: 4px solid var(--pin, #457B9D); }
.check-item { display: flex; gap: 10px; align-items: flex-start; padding: 7px 0; cursor: pointer; }
.check-item input { margin-top: 5px; accent-color: var(--accent); width: 16px; height: 16px; flex-shrink: 0; }
.check-item span { flex: 1; }
.check-item.checked span { color: var(--ink-soft); text-decoration: line-through; }

/* Continue / completion */
.continue-row { display: flex; align-items: center; gap: 12px; margin: 30px 0; }
.continue-row .hintline { font-size: 13px; color: var(--ink-soft); }
.complete-card {
  text-align: center; background: var(--card);
  border: 1.5px solid var(--green); border-radius: 18px; padding: 36px 24px;
  animation: rise 0.35s ease;
}
.complete-card .big { font-size: 40px; }
.complete-card h3 { margin: 10px 0 6px; }
.complete-card p { color: var(--ink-soft); margin: 0 0 18px; }

/* Module intro page */
.mod-intro .lesson-card {
  display: flex; align-items: center; gap: 14px;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 16px 20px; margin-bottom: 10px; text-decoration: none; color: var(--ink);
}
.mod-intro .lesson-card:hover { border-color: var(--accent); }
.mod-intro .lesson-card .num { font-family: var(--mono); font-size: 11px; color: var(--ink-soft); }

/* Curriculum map */
.map-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px; margin-top: 22px;
}
.map-card {
  display: block; background: var(--card); border: 1.5px solid var(--line); border-radius: 16px;
  padding: 20px; text-decoration: none; color: var(--ink); transition: border-color 0.15s;
}
.map-card:hover { border-color: var(--accent); }
.map-card.done { border-color: var(--green); }
.map-card-emoji { font-size: 26px; margin-bottom: 10px; }
.map-card-title { font-weight: 600; font-size: 15px; margin-bottom: 6px; }

@media (max-width: 900px) {
  #menu-toggle {
    display: block; position: fixed; top: 12px; left: 12px; z-index: 30;
    background: var(--card); color: var(--ink);
    border: 1px solid var(--line); border-radius: 10px;
    padding: 8px 14px; font: 600 14px var(--sans); cursor: pointer;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  }
  #sidebar {
    position: fixed; z-index: 20; transform: translateX(-100%);
    transition: transform 0.25s ease; width: min(320px, 86vw);
  }
  body.menu-open #sidebar { transform: none; box-shadow: 8px 0 30px rgba(0,0,0,0.25); }
  #content { padding: 70px 20px 100px; }
}