/* ============================================================
   AgentDojo — stylesheet
   Light + dark themes via CSS custom properties.
   ============================================================ */

:root {
  --bg: #f6f7fb;
  --bg-soft: #eef0f6;
  --surface: #ffffff;
  --surface-2: #f2f4f9;
  --text: #1c2233;
  --text-soft: #5a6272;
  --border: #e3e6ee;
  --primary: #5b5bd6;
  --primary-strong: #4a48c4;
  --primary-soft: #ecebfd;
  --accent: #0ea5a5;
  --accent-soft: #e0f5f5;
  --warn: #e8930c;
  --warn-soft: #fdf0dc;
  --danger: #e03131;
  --danger-soft: #fde6e6;
  --ok: #2f9e44;
  --ok-soft: #e3f6e8;
  --code-bg: #1f2430;
  --code-text: #e6e9f0;
  --shadow: 0 1px 2px rgba(20, 24, 40, .06), 0 8px 24px rgba(20, 24, 40, .07);
  --shadow-lg: 0 12px 40px rgba(20, 24, 40, .14);
  --radius: 12px;
  --radius-sm: 8px;
  --topbar-h: 60px;
  --sidebar-w: 280px;
  --max-w: 1280px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

[data-theme="dark"] {
  --bg: #0e1117;
  --bg-soft: #151923;
  --surface: #171b26;
  --surface-2: #1e2431;
  --text: #e8ebf2;
  --text-soft: #9aa3b5;
  --border: #2a3140;
  --primary: #7c7cf0;
  --primary-strong: #9292f5;
  --primary-soft: #262a4a;
  --accent: #2dd4bf;
  --accent-soft: #12302c;
  --warn: #f0a53a;
  --warn-soft: #3a2d16;
  --danger: #ff6b6b;
  --danger-soft: #3a1d1d;
  --ok: #51cf66;
  --ok-soft: #15301c;
  --code-bg: #0c0f15;
  --code-text: #dfe3ec;
  --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 8px 24px rgba(0, 0, 0, .35);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, .5);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

img, svg { max-width: 100%; }

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; font-weight: 700; }
h1 { font-size: clamp(1.7rem, 3vw, 2.4rem); }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }

code, pre, kbd { font-family: var(--mono); }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  height: var(--topbar-h);
}
.topbar-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.12rem;
  color: var(--text);
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand-mark { font-size: 1.35rem; }
.brand-name { letter-spacing: -.02em; }

.main-nav { display: flex; align-items: center; gap: 4px; margin-left: 6px; }
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text-soft);
  font-weight: 600;
  font-size: .95rem;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font);
}
.nav-link:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.nav-link.active { color: var(--primary); background: var(--primary-soft); }

.nav-dropdown { position: relative; }
.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 230px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  z-index: 200;
}
.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu { display: block; }
.dropdown-menu a {
  display: block;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-weight: 500;
  font-size: .92rem;
}
.dropdown-menu a:hover { background: var(--primary-soft); color: var(--primary); text-decoration: none; }
.dropdown-note { display: block; padding: 10px 12px; color: var(--text-soft); font-size: .88rem; }

.nav-search { margin-left: auto; display: flex; }
.nav-search input {
  width: 200px;
  padding: 9px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  font-size: .9rem;
  outline: none;
  transition: width .18s ease, border-color .18s ease;
}
.nav-search input:focus { width: 260px; border-color: var(--primary); background: var(--surface); }

.topbar-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 1.05rem;
}
.icon-btn:hover { background: var(--bg-soft); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  transition: background .15s, transform .05s, box-shadow .15s;
  font-family: var(--font);
}
.btn:hover { background: var(--primary-strong); text-decoration: none; box-shadow: var(--shadow); }
.btn:active { transform: translateY(1px); }
.btn-sm { padding: 7px 12px; font-size: .85rem; }
.btn-lg { padding: 13px 26px; font-size: 1.05rem; }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-soft); }
.btn-soft { background: var(--primary-soft); color: var(--primary); }
.btn-soft:hover { background: var(--primary); color: #fff; }
.btn-accent { background: var(--accent); }
.btn-accent:hover { background: #0b8f8f; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #c92a2a; }
.btn-block { width: 100%; justify-content: center; }

/* ---------- Flash ---------- */
.flash {
  max-width: var(--max-w);
  margin: 16px auto 0;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: .93rem;
  border: 1px solid transparent;
}
.flash-success { background: var(--ok-soft); color: var(--ok); border-color: var(--ok); }
.flash-error { background: var(--danger-soft); color: var(--danger); border-color: var(--danger); }
.flash-info { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(900px 420px at 15% -10%, var(--primary-soft), transparent 60%),
    radial-gradient(700px 380px at 90% 0%, var(--accent-soft), transparent 55%),
    var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 64px 16px 56px;
  text-align: center;
}
.hero-inner { max-width: 820px; margin: 0 auto; }
.hero .badge {
  display: inline-block;
  background: var(--primary-soft);
  color: var(--primary);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.hero h1 { margin-bottom: 14px; }
.hero h1 .grad {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead { color: var(--text-soft); font-size: 1.12rem; max-width: 640px; margin: 0 auto 28px; }
.hero-search {
  display: flex;
  max-width: 560px;
  margin: 0 auto 18px;
  gap: 8px;
}
.hero-search input {
  flex: 1;
  padding: 14px 18px;
  border-radius: 28px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  font-size: 1rem;
  outline: none;
}
.hero-search input:focus { border-color: var(--primary); background: var(--surface); }
.hero-cta { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 28px; justify-content: center; margin-top: 34px; color: var(--text-soft); flex-wrap: wrap; }
.hero-stats strong { display: block; font-size: 1.35rem; color: var(--text); }

/* ---------- Sections ---------- */
.section { max-width: var(--max-w); margin: 0 auto; padding: 48px 16px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 22px; flex-wrap: wrap; }
.section-head h2 { margin: 0; }
.section-head .see-all { font-weight: 600; font-size: .9rem; }

.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: transform .15s, box-shadow .15s, border-color .15s;
  position: relative;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--primary); text-decoration: none; }
.card .icon { font-size: 1.9rem; display: inline-block; margin-bottom: 10px; }
.card h3 { margin: 0 0 6px; font-size: 1.08rem; color: var(--text); }
.card p { margin: 0 0 12px; color: var(--text-soft); font-size: .93rem; }
.card .meta { color: var(--text-soft); font-size: .82rem; font-weight: 600; }
.card .arrow { position: absolute; right: 18px; bottom: 18px; color: var(--primary); opacity: 0; transition: opacity .15s; }
.card:hover .arrow { opacity: 1; }

.lesson-card { display: flex; flex-direction: column; }
.lesson-card .done-badge {
  position: absolute;
  top: 14px; right: 14px;
  background: var(--ok-soft); color: var(--ok);
  font-size: .72rem; font-weight: 700;
  padding: 3px 9px; border-radius: 20px;
}
.tool-card { display: flex; gap: 14px; align-items: flex-start; }
.tool-card .logo {
  width: 48px; height: 48px; flex: 0 0 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  background: var(--primary-soft);
}
.tool-card h3 { margin-bottom: 2px; }

/* ---------- Learn layout (sidebar + content) ---------- */
.learn-layout {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  gap: 28px;
  padding: 24px 16px 56px;
  align-items: start;
}
.sidebar {
  position: sticky;
  top: calc(var(--topbar-h) + 16px);
  max-height: calc(100vh - var(--topbar-h) - 32px);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
}
.sidebar .side-title {
  font-weight: 800;
  padding: 8px 12px;
  margin: 0 0 4px;
  font-size: .98rem;
}
.sidebar .side-cat {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px;
  color: var(--text-soft);
  font-size: .85rem;
  font-weight: 700;
  border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
}
.sidebar a.side-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: .9rem;
  font-weight: 500;
  border-left: 2px solid transparent;
}
.sidebar a.side-item:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }
.sidebar a.side-item.active {
  background: var(--primary-soft);
  color: var(--primary);
  border-left-color: var(--primary);
  font-weight: 700;
}
.sidebar a.side-item .num {
  width: 20px; height: 20px; flex: 0 0 20px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--bg-soft); color: var(--text-soft);
  border-radius: 50%; font-size: .72rem; font-weight: 700;
}
.sidebar a.side-item.active .num { background: var(--primary); color: #fff; }
.sidebar a.side-item .check { margin-left: auto; color: var(--ok); }

.side-mobile-toggle {
  display: none;
  margin-bottom: 12px;
}

.content { min-width: 0; }
.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
}
@media (max-width: 860px) {
  .learn-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; max-height: none; }
  .sidebar.collapsed { display: none; }
  .side-mobile-toggle { display: inline-flex; }
  .content-card { padding: 20px; }
}

/* ---------- Lesson prose ---------- */
.breadcrumb { color: var(--text-soft); font-size: .85rem; margin-bottom: 14px; }
.breadcrumb a { color: var(--text-soft); }
.breadcrumb .sep { margin: 0 6px; opacity: .6; }

.lesson-head { margin-bottom: 20px; }
.lesson-head h1 { margin-bottom: 8px; }
.lesson-head .intro { color: var(--text-soft); font-size: 1.05rem; margin: 0; }
.lesson-actions { display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 22px; }

.prose { font-size: 1rem; }
.prose p { margin: 0 0 1em; }
.prose ul, .prose ol { margin: 0 0 1em; padding-left: 1.5em; }
.prose li { margin: .3em 0; }
.prose h2 { margin-top: 1.6em; padding-top: .4em; border-top: 1px solid var(--border); }
.prose h3 { margin-top: 1.3em; }
.prose blockquote {
  margin: 1em 0;
  padding: 10px 16px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--text);
}
.prose blockquote p { margin: 0; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 1.6em 0; }
.prose code {
  background: var(--primary-soft);
  color: var(--primary-strong);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: .88em;
}
.prose pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 1em 0;
  font-size: .9rem;
  line-height: 1.55;
}
.prose pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}
.prose table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: .92rem; }
.prose th, .prose td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.prose th { background: var(--surface-2); }

/* Prism theme swap for light mode */
[data-theme="light"] .prose pre,
[data-theme="light"] pre[class*="language-"] { background: #f4f5f9; color: #1c2233; }
[data-theme="light"] pre[class*="language-"] .token.comment,
[data-theme="light"] pre[class*="language-"] .token.prolog { color: #8a92a6; }
[data-theme="light"] pre[class*="language-"] .token.string { color: #0b7a3b; }
[data-theme="light"] pre[class*="language-"] .token.keyword { color: #7a3bd6; }
[data-theme="light"] pre[class*="language-"] .token.function { color: #1a5fd0; }
[data-theme="light"] pre[class*="language-"] .token.number { color: #c2410c; }
[data-theme="light"] pre[class*="language-"] .token.operator { color: #5a6272; }
[data-theme="light"] pre[class*="language-"] .token.attr-name { color: #b45309; }

/* Lesson nav (prev/next) */
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 28px; }
.lesson-nav a {
  display: flex; flex-direction: column;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  color: var(--text);
  max-width: 48%;
}
.lesson-nav a:hover { border-color: var(--primary); text-decoration: none; }
.lesson-nav .dir { font-size: .75rem; color: var(--text-soft); font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
.lesson-nav .ttl { font-weight: 700; }
.lesson-nav a.next { text-align: right; margin-left: auto; }

/* ---------- Exercises ---------- */
.exercise-list { display: grid; gap: 12px; }
.exercise-item {
  display: flex; align-items: center; gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  color: var(--text);
}
.exercise-item:hover { border-color: var(--primary); text-decoration: none; }
.exercise-item .ex-type {
  width: 46px; height: 46px; flex: 0 0 46px;
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  background: var(--primary-soft); font-size: 1.3rem;
}
.exercise-item .ex-body { flex: 1; min-width: 0; }
.exercise-item .ex-body h3 { margin: 0 0 2px; font-size: 1rem; }
.exercise-item .ex-body .ex-meta { color: var(--text-soft); font-size: .82rem; }
.difficulty-pill { padding: 2px 10px; border-radius: 20px; font-size: .75rem; font-weight: 700; color: #fff; }
.score-pill {
  background: var(--ok-soft); color: var(--ok);
  padding: 3px 10px; border-radius: 20px; font-size: .78rem; font-weight: 700;
}

/* Quiz UI */
.quiz-wrap { max-width: 780px; margin: 0 auto; }
.quiz-progress { height: 6px; background: var(--bg-soft); border-radius: 3px; margin-bottom: 18px; overflow: hidden; }
.quiz-progress .bar { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); transition: width .25s; }
.quiz-question { margin-bottom: 18px; }
.quiz-question h2 { font-size: 1.25rem; }
.quiz-code {
  background: var(--code-bg); color: var(--code-text);
  padding: 14px 16px; border-radius: var(--radius-sm);
  overflow-x: auto; font-size: .9rem; margin: 12px 0;
  white-space: pre-wrap;
}
.quiz-options { display: grid; gap: 10px; }
.quiz-option {
  display: flex; gap: 12px; align-items: flex-start;
  text-align: left;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  cursor: pointer;
  font-size: .98rem;
  color: var(--text);
  font-family: var(--font);
  transition: border-color .12s, background .12s;
}
.quiz-option:hover { border-color: var(--primary); }
.quiz-option .letter {
  width: 26px; height: 26px; flex: 0 0 26px;
  border-radius: 50%; background: var(--bg-soft); color: var(--text-soft);
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .85rem;
}
.quiz-option.correct { border-color: var(--ok); background: var(--ok-soft); }
.quiz-option.correct .letter { background: var(--ok); color: #fff; }
.quiz-option.wrong { border-color: var(--danger); background: var(--danger-soft); }
.quiz-option.wrong .letter { background: var(--danger); color: #fff; }
.quiz-option:disabled { cursor: default; }
.quiz-feedback { margin-top: 16px; padding: 14px 16px; border-radius: var(--radius-sm); display: none; }
.quiz-feedback.show { display: block; }
.quiz-feedback.ok { background: var(--ok-soft); color: var(--ok); }
.quiz-feedback.bad { background: var(--danger-soft); color: var(--danger); }
.quiz-feedback .expl { color: var(--text); margin-top: 6px; }
.quiz-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 22px; gap: 12px; }
.quiz-input {
  width: 100%; padding: 13px 16px; font-family: var(--mono);
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text); font-size: 1rem; outline: none;
}
.quiz-input:focus { border-color: var(--primary); }
.score-ring {
  width: 120px; height: 120px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px; font-weight: 800; font-size: 1.6rem;
  color: var(--primary);
  background: conic-gradient(var(--primary) calc(var(--pct) * 1%), var(--bg-soft) 0);
  position: relative;
}
.score-ring::before { content: ""; position: absolute; inset: 10px; background: var(--surface); border-radius: 50%; }
.score-ring span { position: relative; }

/* ---------- Playground ---------- */
.pg-layout {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px 16px 56px;
}
.pg-toolbar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 16px;
}
.pg-toolbar .tabs { display: flex; background: var(--surface-2); border-radius: 20px; padding: 4px; }
.pg-toolbar .tab {
  padding: 7px 16px; border-radius: 16px; color: var(--text-soft);
  font-weight: 600; font-size: .9rem;
}
.pg-toolbar .tab.active { background: var(--surface); color: var(--primary); box-shadow: var(--shadow); }
.pg-toolbar .spacer { flex: 1; }
.pg-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.pg-pane {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column;
}
.pg-pane .pane-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  font-size: .82rem; font-weight: 700; color: var(--text-soft);
}
.pg-pane textarea {
  flex: 1; min-height: 420px; resize: vertical;
  border: none; outline: none; padding: 16px;
  font-family: var(--mono); font-size: .9rem; line-height: 1.6;
  background: var(--code-bg); color: var(--code-text);
}
.pg-pane iframe { flex: 1; min-height: 420px; border: none; background: #fff; width: 100%; }
.pg-output {
  background: var(--code-bg); color: var(--code-text);
  padding: 14px 16px; font-family: var(--mono); font-size: .88rem;
  min-height: 420px; overflow-y: auto; white-space: pre-wrap; word-break: break-word;
}
.pg-output .ok { color: var(--ok); }
.pg-output .err { color: var(--danger); }
.pg-output .dim { color: var(--text-soft); }
.terminal {
  background: #0c0f15; color: #d7dce6; border-radius: var(--radius);
  padding: 18px; font-family: var(--mono); font-size: .9rem; line-height: 1.6;
  min-height: 460px; max-height: 70vh; overflow-y: auto;
}
.terminal .line { white-space: pre-wrap; word-break: break-word; }
.terminal .prompt { color: var(--accent); }
.terminal .cmd { color: #fff; }
.terminal .agent { color: #9aa3b5; }
.terminal .success { color: var(--ok); }
.terminal .warn { color: var(--warn); }
.terminal-input-row { display: flex; align-items: center; gap: 8px; }
.terminal input {
  flex: 1; background: transparent; border: none; outline: none;
  color: #fff; font-family: var(--mono); font-size: .9rem;
}
@media (max-width: 860px) { .pg-grid { grid-template-columns: 1fr; } }

/* ---------- Search ---------- */
.search-results { display: grid; gap: 12px; }
.search-result {
  display: block; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 18px; color: var(--text);
}
.search-result:hover { border-color: var(--primary); text-decoration: none; }
.search-result h3 { margin: 0 0 4px; font-size: 1.05rem; }
.search-result .crumb { color: var(--primary); font-size: .8rem; font-weight: 700; }
.search-result p { margin: 4px 0 0; color: var(--text-soft); font-size: .9rem; }

/* ---------- Admin ---------- */
.admin-shell { max-width: var(--max-w); margin: 0 auto; padding: 24px 16px 60px; }
.admin-nav {
  display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 20px;
  border-bottom: 1px solid var(--border); padding-bottom: 10px;
}
.admin-nav a { padding: 8px 14px; border-radius: var(--radius-sm); color: var(--text-soft); font-weight: 600; font-size: .92rem; }
.admin-nav a:hover { background: var(--bg-soft); text-decoration: none; }
.admin-nav a.active { background: var(--primary-soft); color: var(--primary); }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 14px; margin-bottom: 24px; }
.stat {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px;
}
.stat .n { font-size: 1.9rem; font-weight: 800; }
.stat .l { color: var(--text-soft); font-size: .85rem; }

.table { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.table th, .table td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--border); font-size: .92rem; vertical-align: top; }
.table th { background: var(--surface-2); font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; color: var(--text-soft); }
.table tr:last-child td { border-bottom: none; }
.table .actions { display: flex; gap: 6px; }
.table .actions a, .table .actions button {
  padding: 5px 10px; border-radius: 6px; font-size: .8rem; font-weight: 600;
  background: var(--bg-soft); color: var(--text); border: 1px solid var(--border); cursor: pointer;
}
.table .actions a:hover, .table .actions button:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }
.table .actions .del { color: var(--danger); }
.table .actions .del:hover { border-color: var(--danger); }
.table .actions .link { color: var(--primary); }
.table .actions .link:hover { border-color: var(--primary); }

.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }
.badge-success { background: rgba(34,197,94,.14); color: #16a34a; }
.badge-danger { background: rgba(239,68,68,.14); color: var(--danger); }

.form-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; max-width: 820px; }
.form-panel .field { margin-bottom: 16px; }
.form-panel label { display: block; font-weight: 700; font-size: .88rem; margin-bottom: 6px; }
.form-panel .hint { color: var(--text-soft); font-size: .8rem; margin-top: 4px; }
.form-panel input[type="text"],
.form-panel input[type="password"],
.form-panel input[type="number"],
.form-panel input[type="url"],
.form-panel select,
.form-panel textarea {
  width: 100%; padding: 10px 12px; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text); font-size: .95rem; outline: none; font-family: var(--font);
}
.form-panel textarea { font-family: var(--mono); font-size: .88rem; line-height: 1.6; }
.form-panel input:focus, .form-panel select:focus, .form-panel textarea:focus { border-color: var(--primary); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }

.editor-tabs { display: flex; gap: 6px; margin-bottom: 8px; }
.editor-tabs button {
  padding: 6px 14px; border-radius: 6px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-soft); cursor: pointer; font-size: .85rem; font-weight: 600;
}
.editor-tabs button.active { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }

.login-card { max-width: 420px; margin: 48px auto; }

/* ---------- Footer ---------- */
.site-footer { background: var(--surface); border-top: 1px solid var(--border); margin-top: 40px; }
.footer-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 40px 16px 24px;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 28px;
}
.footer-brand p { color: var(--text-soft); font-size: .9rem; margin: 8px 0 0; max-width: 320px; }
.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-col h4 { margin: 0 0 4px; font-size: .85rem; text-transform: uppercase; letter-spacing: .05em; color: var(--text-soft); }
.footer-col a { color: var(--text-soft); font-size: .9rem; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--border); padding: 16px;
  text-align: center; color: var(--text-soft); font-size: .82rem;
}
@media (max-width: 860px) { .footer-inner { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-inner { grid-template-columns: 1fr; } }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; }
.mb-2 { margin-bottom: 16px; }
.muted { color: var(--text-soft); }
.hidden { display: none !important; }
.callout {
  border-radius: var(--radius-sm); padding: 12px 16px; margin: 1em 0;
  font-size: .93rem; border: 1px solid transparent;
}
.callout-tip { background: var(--ok-soft); color: var(--ok); border-color: var(--ok); }
.callout-warn { background: var(--warn-soft); color: var(--warn); border-color: var(--warn); }
.callout-info { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }

.skip-link { position: absolute; left: -999px; top: 0; background: var(--primary); color: #fff; padding: 8px 14px; z-index: 999; }
.skip-link:focus { left: 0; }

/* ---------- Per-lesson Try It ---------- */
.tryit { margin-top: 24px; }
.tryit-panel { margin-top: 12px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.tryit-toolbar { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid var(--border); }
.tryit-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.tryit-pane { display: flex; flex-direction: column; min-height: 380px; }
.tryit-pane .pane-head { padding: 8px 12px; border-bottom: 1px solid var(--border); font-size: .8rem; font-weight: 700; color: var(--text-soft); }
.tryit-pane textarea { flex: 1; border: none; border-right: 1px solid var(--border); outline: none; padding: 12px; font-family: var(--mono); font-size: .88rem; line-height: 1.55; background: var(--code-bg); color: var(--code-text); resize: none; }
.tryit-pane iframe { flex: 1; border: none; width: 100%; min-height: 380px; background: #fff; }
@media (max-width: 700px) {
  .tryit-grid { grid-template-columns: 1fr; }
  .tryit-pane textarea { border-right: none; border-bottom: 1px solid var(--border); min-height: 200px; }
  .tryit-pane iframe { min-height: 260px; }
}