/* ============================================================
   Microfrontend Studio — design system
   ============================================================ */

:root {
  --bg: #f4f5f7;
  --bg-soft: #eceef2;
  --surface: #ffffff;
  --surface-2: #fafbfc;
  --border: #dfe2e8;
  --border-strong: #c6cad4;
  --text: #1b1f27;
  --text-soft: #555e6e;
  --text-faint: #8a93a5;
  --accent: #5b5bd6;
  --accent-soft: rgba(91, 91, 214, 0.12);
  --mf: #2563eb;        /* module federation */
  --mf-soft: rgba(37, 99, 235, 0.12);
  --spa: #ea580c;       /* single-spa */
  --spa-soft: rgba(234, 88, 12, 0.12);
  --ok: #15803d;
  --ok-soft: rgba(21, 128, 61, 0.12);
  --warn: #b45309;
  --warn-soft: rgba(180, 83, 9, 0.12);
  --bad: #b91c1c;
  --bad-soft: rgba(185, 28, 28, 0.12);
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 16px rgba(16, 24, 40, 0.05);
  --shadow-lift: 0 2px 6px rgba(16, 24, 40, 0.08), 0 12px 32px rgba(16, 24, 40, 0.12);
  --radius: 14px;
  --radius-sm: 9px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

:root[data-theme="dark"] {
  --bg: #0e1014;
  --bg-soft: #14171d;
  --surface: #1a1e26;
  --surface-2: #1e232c;
  --border: #2a303b;
  --border-strong: #3a4250;
  --text: #e8eaf0;
  --text-soft: #9aa3b2;
  --text-faint: #69727f;
  --accent: #8b8bff;
  --accent-soft: rgba(139, 139, 255, 0.14);
  --mf: #6ea8ff;
  --mf-soft: rgba(110, 168, 255, 0.14);
  --spa: #ff9a4d;
  --spa-soft: rgba(255, 154, 77, 0.14);
  --ok: #4ade80;
  --ok-soft: rgba(74, 222, 128, 0.14);
  --warn: #fbbf24;
  --warn-soft: rgba(251, 191, 36, 0.13);
  --bad: #f87171;
  --bad-soft: rgba(248, 113, 113, 0.14);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 6px 20px rgba(0, 0, 0, 0.35);
  --shadow-lift: 0 2px 6px rgba(0, 0, 0, 0.4), 0 16px 40px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.25s ease, color 0.25s ease;
}

#app { min-height: 100vh; display: flex; flex-direction: column; }

/* ---------------- Top bar ---------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--mf), var(--accent) 55%, var(--spa));
  color: #fff;
  font-size: 20px;
  box-shadow: var(--shadow);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 15.5px; letter-spacing: 0.2px; }
.brand-sub { font-size: 12px; color: var(--text-faint); }

.topbar-right { display: flex; align-items: center; gap: 12px; }

.progress-mini { display: flex; align-items: center; gap: 8px; }
.progress-mini-track {
  width: 120px; height: 8px;
  background: var(--bg-soft);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progress-mini-fill {
  height: 100%; width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--mf), var(--accent), var(--spa));
  transition: width 0.4s ease;
}
.progress-mini-num {
  font-size: 12.5px; font-weight: 700;
  color: var(--text-soft);
  min-width: 38px; text-align: right;
  font-variant-numeric: tabular-nums;
}

.iconbtn {
  width: 38px; height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-soft);
  font-size: 17px;
  cursor: pointer;
  display: grid; place-items: center;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}
.iconbtn:hover { border-color: var(--border-strong); background: var(--surface-2); transform: translateY(-1px); }

/* ---------------- Tabs ---------------- */

.tabs {
  position: sticky;
  top: 65px;
  z-index: 40;
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.tabs-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 8px 20px 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
}
.tab {
  appearance: none;
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  color: var(--text-soft);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 16px 11px;
  border-radius: 10px 10px 0 0;
  cursor: pointer;
  white-space: nowrap;
  display: flex; align-items: center; gap: 8px;
  transition: color 0.15s ease, background 0.15s ease;
}
.tab:hover { color: var(--text); background: var(--bg-soft); }
.tab[aria-selected="true"] {
  color: var(--accent);
  background: var(--bg);
  border-color: var(--border);
  box-shadow: 0 -3px 0 var(--accent) inset;
}
.tab .tab-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--border-strong);
}
.tab[aria-selected="true"] .tab-dot { background: var(--accent); }

/* ---------------- View / layout ---------------- */

.view {
  flex: 1;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 60px;
  outline: none;
}

.view-head { margin-bottom: 24px; }
.kicker {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.4px;
  color: var(--accent);
  margin: 0 0 8px;
}
.view-title { font-size: 30px; line-height: 1.15; margin: 0; letter-spacing: -0.4px; }
.view-sub { color: var(--text-soft); margin: 8px 0 0; font-size: 15.5px; max-width: 720px; }

/* ---------------- Week / session grid ---------------- */

.week-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}
.session-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
  font: inherit;
  color: inherit;
  transition: transform 0.12s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.session-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lift); border-color: var(--border-strong); }
.session-card.complete { border-color: color-mix(in srgb, var(--ok) 45%, var(--border)); }

.session-card-top { display: flex; align-items: center; justify-content: space-between; }
.session-icon {
  width: 38px; height: 38px;
  border-radius: 10px;
  display: grid; place-items: center;
  font-size: 18px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
}
.session-icon.done { background: var(--ok-soft); border-color: var(--ok); }
.session-num {
  font-size: 11px; font-weight: 800; letter-spacing: 1px;
  color: var(--text-faint);
  text-transform: uppercase;
}
.session-card h3 { margin: 0; font-size: 16.5px; line-height: 1.3; }
.session-card p { margin: 0; font-size: 13.5px; color: var(--text-soft); line-height: 1.5; }
.session-meta {
  margin-top: 4px;
  display: flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--text-faint);
  font-weight: 600;
}

/* ---------------- Lesson view ---------------- */

.lesson {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px clamp(18px, 4vw, 44px);
}
.lesson-head { margin-bottom: 26px; padding-bottom: 22px; border-bottom: 1px solid var(--border); }
.lesson-head .kicker { margin-bottom: 6px; }
.lesson-head h1 { margin: 0; font-size: 26px; letter-spacing: -0.3px; line-height: 1.2; }
.lesson-head p { color: var(--text-soft); margin: 10px 0 0; font-size: 15px; max-width: 760px; }

.lesson-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 22px; }
.back-btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text-soft);
  font: inherit; font-size: 13.5px; font-weight: 600;
  padding: 8px 14px;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.back-btn:hover { background: var(--surface-2); border-color: var(--border-strong); color: var(--text); }

.complete-toggle {
  display: inline-flex; align-items: center; gap: 9px;
  font: inherit; font-size: 13.5px; font-weight: 700;
  cursor: pointer;
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-soft);
  transition: all 0.15s ease;
}
.complete-toggle:hover { border-color: var(--border-strong); }
.complete-toggle.is-complete {
  background: var(--ok-soft);
  border-color: var(--ok);
  color: var(--ok);
}
.checkbox-dot {
  width: 17px; height: 17px; border-radius: 5px;
  border: 1.6px solid var(--border-strong);
  display: grid; place-items: center;
  font-size: 11px; color: transparent;
  transition: all 0.15s ease;
}
.complete-toggle.is-complete .checkbox-dot { background: var(--ok); border-color: var(--ok); color: #fff; }

/* section blocks */
.sec { margin: 0 0 26px; }
.sec:last-child { margin-bottom: 0; }
.sec h2 { font-size: 19px; margin: 0 0 12px; letter-spacing: -0.2px; }
.sec h3 { font-size: 16px; margin: 22px 0 8px; }
.sec p { margin: 0 0 12px; color: var(--text); }
.sec p:last-child { margin-bottom: 0; }
.sec .lead { font-size: 15.5px; color: var(--text-soft); }
.sec strong { font-weight: 700; }
code.inline {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
  color: var(--accent);
}
:root[data-theme="dark"] code.inline { color: #b9b9ff; }

.sec ul, .sec ol { margin: 0 0 12px; padding-left: 22px; }
.sec li { margin: 5px 0; }

/* callouts */
.callout {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  background: var(--surface-2);
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 14.5px;
}
.callout .callout-title { font-weight: 800; margin-bottom: 6px; display: flex; gap: 8px; align-items: center; font-size: 14px; }
.callout p { margin: 6px 0 0; }
.callout p:first-of-type { margin-top: 0; }
.callout.key { border-left-color: var(--accent); background: var(--accent-soft); }
.callout.tip { border-left-color: var(--ok); background: var(--ok-soft); }
.callout.tip .callout-title { color: var(--ok); }
.callout.warn { border-left-color: var(--warn); background: var(--warn-soft); }
.callout.warn .callout-title { color: var(--warn); }
.callout.trap { border-left-color: var(--bad); background: var(--bad-soft); }
.callout.trap .callout-title { color: var(--bad); }
.callout.memo {
  border-left-color: var(--spa);
  background: var(--spa-soft);
  border: 1.5px dashed var(--spa);
}
.callout.memo .callout-title { color: var(--spa); font-size: 15px; }
.callout.memo p { font-size: 15px; line-height: 1.7; }

/* code blocks */
.codeblock {
  background: #0d1117;
  color: #d6dbe3;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  margin: 16px 0;
  overflow: hidden;
}
.codeblock-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 14px;
  background: #161b22;
  border-bottom: 1px solid #242b36;
  font-family: var(--mono);
  font-size: 11.5px;
  color: #7d8696;
}
.codeblock-head .lang { font-weight: 700; color: #a7b0bf; text-transform: uppercase; letter-spacing: 0.6px; }
.codeblock pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
}
.codeblock code { color: inherit; }
:root[data-theme="dark"] .codeblock { border-color: #2a303b; }

/* tables */
.tablewrap { overflow-x: auto; margin: 16px 0; border-radius: var(--radius-sm); border: 1px solid var(--border); }
table.mtable { border-collapse: collapse; width: 100%; font-size: 13.5px; min-width: 520px; }
.mtable th {
  background: var(--bg-soft);
  text-align: left;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-soft);
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.mtable td { padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
.mtable tr:last-child td { border-bottom: none; }
.mtable tbody tr:hover { background: var(--surface-2); }
.mtable td code { font-family: var(--mono); font-size: 0.9em; background: var(--bg-soft); border-radius: 4px; padding: 0 5px; }

/* diagrams */
.diagram {
  margin: 18px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  padding: 12px;
  overflow-x: auto;
}
.diagram svg { display: block; margin: 0 auto; width: 100%; height: auto; min-width: 640px; }
.diagram-caption { font-size: 12.5px; color: var(--text-faint); margin: 10px 4px 2px; text-align: center; }

/* SVG shared styles (theme-aware via CSS vars) */
.dg .dg-box rect { fill: var(--surface); stroke: var(--border-strong); stroke-width: 1.4; }
.dg .dg-box.hl rect { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.8; }
.dg .dg-box.mf rect { fill: var(--mf-soft); stroke: var(--mf); }
.dg .dg-box.spa rect { fill: var(--spa-soft); stroke: var(--spa); }
.dg .dg-box.ok rect { fill: var(--ok-soft); stroke: var(--ok); }
.dg .dg-box.dim rect { fill: var(--bg-soft); stroke: var(--border); }
.dg .dg-t { fill: var(--text); font-size: 13px; font-weight: 700; text-anchor: middle; }
.dg .dg-t-main { fill: var(--text); font-size: 13px; font-weight: 700; }
.dg .dg-sub { fill: var(--text-faint); font-size: 10.5px; text-anchor: middle; font-weight: 500; }
.dg .dg-lbl { fill: var(--text-soft); font-size: 11px; font-weight: 600; text-anchor: middle; }
.dg .dg-phase { fill: var(--text-faint); font-size: 11.5px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; text-anchor: middle; }
.dg .dg-line { stroke: var(--border-strong); stroke-width: 1.6; }
.dg .dg-line.thin { stroke-width: 1.2; stroke-dasharray: 3 3; }
.dg .dg-node rect { fill: var(--surface); stroke: var(--accent); stroke-width: 2; }
.dg .dg-node.ok rect { fill: var(--ok-soft); stroke: var(--ok); }
.dg .dg-node.bad rect { fill: var(--bad-soft); stroke: var(--bad); }
.dg .dg-node.spa rect { fill: var(--spa-soft); stroke: var(--spa); }
.dg .dg-node.hl rect { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 2.2; }
.dg .dg-node.warn rect { fill: var(--warn-soft); stroke: var(--warn); }
.dg .dg-arrow line { stroke: var(--text-soft); stroke-width: 1.7; }
.dg .dg-arrow.dim line { stroke: var(--text-faint); stroke-width: 1.3; }
.dg .dg-arrow.bad line { stroke: var(--bad); }
.dg .dg-arrow-marker path { fill: var(--text-soft); }
.dg .dg-arrow.bad .dg-arrow-marker path { fill: var(--bad); }
.dg .dg-badge-t { fill: #fff; font-size: 9px; font-weight: 800; text-anchor: middle; }
.dg .dg-badge-1 { fill: var(--mf); }
.dg .dg-badge-2 { fill: var(--spa); }
.dg .dg-badge-3 { fill: var(--accent); }
.dg .dg-chip { fill: var(--bg-soft); stroke: var(--border-strong); }
.dg .dg-chip-t { fill: var(--text-soft); font-size: 10px; font-weight: 700; text-anchor: middle; }

/* reveal Q&A */
.reveal {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  margin: 12px 0;
  overflow: hidden;
}
.reveal-q {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 14px 16px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14.5px;
  user-select: none;
}
.reveal-q .q-num {
  flex: 0 0 auto;
  width: 26px; height: 26px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid; place-items: center;
  font-size: 12.5px; font-weight: 800;
}
.reveal-a {
  display: none;
  padding: 4px 16px 16px 54px;
  font-size: 14px;
  color: var(--text-soft);
}
.reveal.open .reveal-a { display: block; }
.reveal-a .reveal-a-label {
  font-size: 11px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase;
  color: var(--ok); margin-bottom: 4px;
}

/* flashcards */
.flash-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.flash-counter { font-size: 13.5px; color: var(--text-soft); font-weight: 700; font-variant-numeric: tabular-nums; }
.flash-card-wrap { perspective: 1200px; margin: 0 auto 22px; max-width: 560px; }
.flash-card {
  position: relative;
  height: 260px;
  transform-style: preserve-3d;
  transition: transform 0.45s ease;
  cursor: pointer;
}
.flash-card.flipped { transform: rotateY(180deg); }
.flash-face {
  position: absolute; inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center;
  padding: 28px;
}
.flash-face.front { background: var(--surface); }
.flash-face.front .term-label {
  font-size: 11px; font-weight: 800; letter-spacing: 1.4px; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}
.flash-face.front h2 { margin: 0; font-size: 24px; letter-spacing: -0.3px; }
.flash-face.front .hint { position: absolute; bottom: 14px; font-size: 12px; color: var(--text-faint); }
.flash-face.back {
  transform: rotateY(180deg);
  background: var(--surface-2);
  border-color: var(--accent);
  justify-content: flex-start;
  text-align: left;
  overflow-y: auto;
}
.flash-face.back h3 { margin: 0 0 10px; font-size: 17px; color: var(--accent); }
.flash-face.back p { margin: 0; font-size: 14px; color: var(--text); line-height: 1.6; }
.flash-nav { display: flex; gap: 10px; justify-content: center; align-items: center; }

/* quiz */
.quiz-start { text-align: center; padding: 40px 0; }
.quiz-start h2 { font-size: 24px; margin: 0 0 8px; }
.quiz-start p { color: var(--text-soft); max-width: 520px; margin: 0 auto 22px; }
.btn-primary {
  background: linear-gradient(135deg, var(--mf), var(--accent));
  color: #fff;
  border: none;
  font: inherit; font-weight: 700; font-size: 15px;
  padding: 12px 26px;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, box-shadow 0.15s ease;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-lift); }

.quiz-q {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin-bottom: 16px;
}
.quiz-q .q-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.quiz-q .q-idx {
  font-size: 11px; font-weight: 800; letter-spacing: 1px;
  color: var(--text-faint); text-transform: uppercase;
}
.quiz-q .q-text { font-weight: 700; font-size: 15.5px; line-height: 1.45; }
.quiz-opts { display: grid; gap: 8px; }
.quiz-opt {
  display: flex; align-items: center; gap: 11px;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
  cursor: pointer;
  font: inherit; font-size: 14px; color: var(--text);
  text-align: left;
  transition: border-color 0.12s ease, background 0.12s ease;
}
.quiz-opt:hover { border-color: var(--border-strong); background: var(--surface); }
.quiz-opt .opt-letter {
  flex: 0 0 auto;
  width: 24px; height: 24px; border-radius: 7px;
  display: grid; place-items: center;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  font-size: 12px; font-weight: 800;
  color: var(--text-soft);
}
.quiz-opt.selected { border-color: var(--accent); background: var(--accent-soft); }
.quiz-opt.selected .opt-letter { background: var(--accent); color: #fff; border-color: var(--accent); }
.quiz-opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.quiz-opt.correct .opt-letter { background: var(--ok); color: #fff; border-color: var(--ok); }
.quiz-opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.quiz-opt.wrong .opt-letter { background: var(--bad); color: #fff; border-color: var(--bad); }
.quiz-opt.disabled { pointer-events: none; }
.quiz-explain {
  display: none;
  margin-top: 10px;
  font-size: 13.5px;
  padding: 10px 14px;
  border-radius: 9px;
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
}
.quiz-explain.show { display: block; }
.quiz-explain .why { font-weight: 800; color: var(--ok); }

.quiz-score {
  text-align: center;
  padding: 34px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 18px;
}
.quiz-score .score-ring { font-size: 44px; font-weight: 800; letter-spacing: -1px; }
.quiz-score .score-msg { color: var(--text-soft); margin-top: 6px; }

/* glossary search */
.searchbox {
  width: 100%;
  max-width: 520px;
  padding: 11px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 14.5px;
  margin-bottom: 18px;
}
.searchbox:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.glossary-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.gloss-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
}
.gloss-card h4 { margin: 0 0 6px; font-size: 15px; font-family: var(--mono); color: var(--accent); }
.gloss-card p { margin: 0; font-size: 13.5px; color: var(--text-soft); }
.gloss-none { color: var(--text-faint); font-size: 14px; padding: 10px 2px; }

/* comparison strips (cheat sheet one-liners) */
.compare-list { display: grid; gap: 10px; }
.compare-item {
  display: flex; gap: 14px; align-items: baseline;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}
.compare-item .vs { flex: 0 0 auto; font-size: 11px; font-weight: 800; color: var(--accent); letter-spacing: 0.6px; }
.compare-item p { margin: 0; font-size: 14px; }

/* footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 18px 20px;
  text-align: center;
  color: var(--text-faint);
  font-size: 12.5px;
}
.footer code { font-family: var(--mono); }

/* responsive */
@media (max-width: 720px) {
  .tabs-inner { padding-top: 6px; }
  .tab { font-size: 13px; padding: 9px 12px 10px; }
  .view { padding: 20px 14px 50px; }
  .view-title { font-size: 24px; }
  .lesson { padding: 22px 18px; }
  .progress-mini-track { width: 80px; }
  .brand-sub { display: none; }
}

/* focus visibility */
.tab:focus-visible, .session-card:focus-visible, .iconbtn:focus-visible,
.back-btn:focus-visible, .quiz-opt:focus-visible, .flash-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}