/* ===== Tokens ===== */
:root {
  --primary: #1ca0f1;
  --primary-600: #0f8ad7;
  --primary-700: #0773b6;
  --primary-bg: #e4f5fe;
  --primary-bg-soft: #f3faff;

  --ink: #424b55;
  --ink-strong: #14202b;
  --ink-soft: #5b6470;
  --muted: #8a93a0;
  --muted-soft: #b3b9c2;

  --line: #ECEEF1;
  --line-soft: #F4F5F7;
  --bg: #ffffff;
  --bg-sidebar: #fbfbfa;
  --bg-card: #ffffff;
  --hover-bg: rgba(120, 130, 140, 0.07);
  --hover-bg-strong: rgba(28, 160, 241, 0.08);

  --yellow-bg: #fde8a8;
  --yellow-bg-soft: #fdf3d3;
  --yellow-text: #6b5318;
  --green: #22a97a;
  --green-strong: #1f8a5c;
  --green-soft: #6ed4ab;
  --green-bg: #e1f5ee;
  --pink-bg: #fbeaf0;

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --content-width: 720px;
  --sidebar-width: 280px;
  --rail-width: 76px;

  --shadow-card: 0 1px 2px rgba(20, 32, 43, 0.04), 0 0 0 1px rgba(20, 32, 43, 0.04);
  --shadow-video: 0 24px 60px -20px rgba(28, 160, 241, 0.25), 0 4px 16px rgba(20, 32, 43, 0.06);
  --shadow-lift: 0 8px 24px -8px rgba(20, 32, 43, 0.12);

  --font: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background:
    radial-gradient(1100px 600px at 100% -10%, rgba(28, 160, 241, 0.045), transparent 60%),
    var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a { color: var(--primary); text-decoration: none; }
a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 3px;
}

::selection { background: var(--primary-bg); color: var(--ink-strong); }

/* ===== Layout ===== */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

/* ===== Top navbar (course pages) ===== */
.topnav {
  position: sticky;
  top: 0;
  z-index: 25;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 22px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
  min-height: 56px;
}
.topnav-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px 7px 10px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-strong);
  text-decoration: none;
  background: var(--line-soft);
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.topnav-back:hover {
  background: var(--hover-bg-strong);
  color: var(--primary-700);
  text-decoration: none;
  transform: translateX(-1px);
}
.topnav-back svg { flex-shrink: 0; }
.topnav-title {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink-strong);
  letter-spacing: -0.01em;
  padding-left: 16px;
  margin-left: 4px;
  border-left: 1px solid var(--line);
}
.topnav-emoji {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  font-size: 16px;
  line-height: 1;
  background: linear-gradient(135deg, var(--course-color, var(--primary)) 0%, var(--primary-600) 100%);
  box-shadow: 0 4px 10px -4px var(--course-color, var(--primary));
  color: #fff;
}
.topnav-name { color: var(--ink-strong); }

.topnav-progress {
  margin-left: auto;
  display: inline-flex;
  flex-direction: column;
  align-items: stretch;
  gap: 5px;
  min-width: 168px;
  max-width: 240px;
}
.topnav-progress-label {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-align: right;
  line-height: 1;
}
.topnav-progress-count {
  color: var(--ink-strong);
  font-variant-numeric: tabular-nums;
}
.topnav-progress-bar {
  height: 5px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--green) 12%, var(--line));
  overflow: hidden;
}
.topnav-progress-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--green-soft));
  border-radius: inherit;
  transition: width 0.32s ease;
}
.topnav-progress.is-done .topnav-progress-label {
  color: var(--green-strong);
}

body.has-topnav .sidebar { top: 56px; height: calc(100vh - 56px); }

/* ===== Home page ===== */
body.home {
  background:
    radial-gradient(900px 500px at 100% -10%, rgba(28, 160, 241, 0.08), transparent 60%),
    radial-gradient(700px 500px at -10% 110%, rgba(155, 58, 166, 0.05), transparent 60%),
    var(--bg);
}
.home-main {
  max-width: 980px;
  margin: 0 auto;
  padding: 88px 32px 96px;
  animation: fade-up 0.4s ease-out both;
}
.home-header { margin-bottom: 36px; }
.home-eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--primary);
  padding: 4px 10px;
  background: var(--primary-bg);
  border-radius: 999px;
  margin: 0 0 14px;
}
.home-title {
  font-size: 52px;
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--ink-strong);
  margin: 0 0 12px;
}
.home-lead {
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0;
  max-width: 640px;
}
.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 8px;
}
.course-card {
  display: flex;
  flex-direction: column;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  text-decoration: none;
  color: var(--ink-strong);
  box-shadow: var(--shadow-card);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
/* Soft color wash that grows on hover */
.course-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(140% 80% at 0% 0%,
      color-mix(in srgb, var(--course-color, var(--primary)) 14%, transparent) 0%,
      transparent 55%);
  opacity: 0.6;
  transition: opacity 0.22s ease;
  pointer-events: none;
}
.course-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--course-color, var(--primary)) 50%, var(--line));
  box-shadow:
    0 14px 30px -14px color-mix(in srgb, var(--course-color, var(--primary)) 45%, transparent),
    var(--shadow-lift);
  text-decoration: none;
}
.course-card:hover::before { opacity: 1; }

/* Hero band — full colored rectangle */
.course-card-hero {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 56px 24px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg,
    var(--course-color, var(--primary)) 0%,
    color-mix(in srgb, var(--course-color, var(--primary)) 55%, #000) 100%);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.08);
}
.course-card-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 80% at 100% 0%, rgba(255, 255, 255, 0.18) 0%, transparent 55%),
    radial-gradient(90% 70% at 0% 100%, rgba(0, 0, 0, 0.18) 0%, transparent 60%);
  pointer-events: none;
}
.course-card-tile {
  display: inline-grid;
  place-items: center;
  position: relative;
  transition: transform 0.22s ease;
}
.course-card:hover .course-card-tile { transform: scale(1.06) rotate(-2deg); }
.course-card-emoji {
  font-size: 64px;
  line-height: 1;
  filter: saturate(1.1) drop-shadow(0 6px 14px rgba(0, 0, 0, 0.25));
}

/* Title block */
.course-card-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 24px 20px;
  text-align: center;
  flex: 1;
}
.course-card-eyebrow {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--course-color, var(--primary));
  opacity: 0.85;
}
.course-card-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-strong);
  letter-spacing: -0.015em;
  line-height: 1.25;
}
.course-card-meta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-top: 2px;
}
.course-card-description {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.55;
  margin-top: 6px;
}
.course-card-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--muted-soft);
}

/* Progress bar on course cards */
.course-card-progress {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 14px;
  align-items: stretch;
}
.course-card-progress-bar {
  height: 5px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--green) 12%, var(--line));
  overflow: hidden;
}
.course-card-progress-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--green-soft));
  border-radius: inherit;
  transition: width 0.32s ease;
}
.course-card-progress-label {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-align: center;
}
.course-card.is-done .course-card-progress-label {
  color: var(--green-strong);
}

/* Completion badge on course-card hero (top-right of tile area) */
.course-card-hero { position: relative; }
.course-card-badge {
  position: absolute;
  top: 14px;
  right: 18px;
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #fff;
  color: var(--course-color, var(--primary));
  box-shadow: 0 6px 14px -4px rgba(0, 0, 0, 0.3);
  z-index: 1;
}
.course-card-badge .row-check {
  opacity: 1;
  transform: none;
  color: var(--course-color, var(--primary));
  width: 14px;
  height: 14px;
}

/* CTA footer */
.course-card-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 22px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--course-color, var(--primary));
  background: color-mix(in srgb, var(--course-color, var(--primary)) 4%, transparent);
  transition: background 0.22s ease, padding 0.22s ease;
}
.course-card-arrow {
  flex-shrink: 0;
  transition: transform 0.22s ease;
}
.course-card:hover .course-card-cta {
  background: color-mix(in srgb, var(--course-color, var(--primary)) 12%, transparent);
}
.course-card:hover .course-card-arrow { transform: translateX(4px); }

@media (max-width: 720px) {
  .home-grid { gap: 14px; }
  .course-card-hero { padding: 44px 20px; }
  .course-card-emoji { font-size: 52px; }
  .course-card-body { padding: 16px 20px 18px; }
  .course-card-title { font-size: 17.5px; }
}

/* Locked course card — visible but not clickable */
.course-card.is-locked {
  cursor: not-allowed;
  filter: grayscale(0.55);
  opacity: 0.78;
}
.course-card.is-locked:hover {
  transform: none;
  border-color: var(--line);
  box-shadow: var(--shadow-card);
}
.course-card.is-locked::before { opacity: 0.35; }
.course-card.is-locked .course-card-hero {
  background: linear-gradient(135deg, #9aa3ad 0%, #6a727b 100%);
}
.course-card.is-locked .course-card-hero::after {
  background:
    radial-gradient(120% 80% at 100% 0%, rgba(255, 255, 255, 0.10) 0%, transparent 55%),
    radial-gradient(90% 70% at 0% 100%, rgba(0, 0, 0, 0.22) 0%, transparent 60%);
}
.course-card.is-locked:hover .course-card-tile { transform: none; }
.course-card.is-locked .course-card-emoji {
  filter: saturate(0.4) drop-shadow(0 6px 14px rgba(0, 0, 0, 0.25));
}
.course-card-badge.course-card-badge-lock {
  background: rgba(255, 255, 255, 0.95);
  color: #4a525b;
}
.course-card-badge.course-card-badge-lock .course-card-lock-icon {
  color: #4a525b;
}
.course-card.is-locked .course-card-cta {
  color: #5a626b;
  background: color-mix(in srgb, #6a727b 5%, transparent);
  border-top: 1px dashed var(--line);
}
.course-card.is-locked .course-card-cta .course-card-lock-icon {
  flex-shrink: 0;
}

/* Lock tooltip — floats above locked cards on hover */
.lock-tooltip {
  position: fixed;
  z-index: 9999;
  transform: translateX(-50%);
  background: #1c2027;
  color: #fff;
  border-radius: 10px;
  padding: 11px 15px;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.45;
  max-width: 210px;
  text-align: center;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.28);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.18s ease;
}
.lock-tooltip.is-visible {
  opacity: 1;
}
.lock-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 7px solid transparent;
  border-top-color: #1c2027;
}

/* ===== Overview card variant — used for non-training website portals =====
   Distinct from the training card: no big colored hero, no progress bar.
   Thin colored top stripe + circular emoji badge + description-led body. */
.course-card.is-overview {
  background:
    linear-gradient(180deg,
      color-mix(in srgb, var(--course-color, var(--primary)) 5%, var(--bg-card)) 0%,
      var(--bg-card) 38%);
}
.course-card.is-overview::before {
  background:
    radial-gradient(120% 60% at 100% 100%,
      color-mix(in srgb, var(--course-color, var(--primary)) 12%, transparent) 0%,
      transparent 60%);
  opacity: 0.7;
}
.course-card-stripe {
  display: block;
  height: 6px;
  background: linear-gradient(90deg,
    var(--course-color, var(--primary)) 0%,
    color-mix(in srgb, var(--course-color, var(--primary)) 60%, #fff) 100%);
}
.course-card.is-overview .course-card-body {
  padding: 28px 26px 22px;
  align-items: flex-start;
  text-align: left;
  gap: 10px;
}
.course-card-badge-emoji {
  display: inline-grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: color-mix(in srgb, var(--course-color, var(--primary)) 14%, #fff);
  border: 1px solid color-mix(in srgb, var(--course-color, var(--primary)) 22%, var(--line));
  box-shadow:
    0 6px 14px -8px color-mix(in srgb, var(--course-color, var(--primary)) 45%, transparent),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
  margin-bottom: 4px;
  transition: transform 0.22s ease;
}
.course-card.is-overview:hover .course-card-badge-emoji {
  transform: scale(1.05) rotate(-3deg);
}
.course-card-badge-emoji .course-card-emoji {
  font-size: 30px;
  filter: saturate(1.05) drop-shadow(0 2px 4px rgba(0, 0, 0, 0.12));
}
.course-card.is-overview .course-card-title {
  font-size: 20px;
  line-height: 1.2;
}
.course-card.is-overview .course-card-description {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.55;
  margin-top: 0;
}
.course-card-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.course-card-tag {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 4px 9px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--course-color, var(--primary)) 10%, transparent);
  color: color-mix(in srgb, var(--course-color, var(--primary)) 65%, var(--ink-strong));
  border: 1px solid color-mix(in srgb, var(--course-color, var(--primary)) 18%, transparent);
}
.course-card-cta.is-ghost {
  background: transparent;
  border-top: 1px dashed color-mix(in srgb, var(--course-color, var(--primary)) 25%, var(--line));
}
.course-card.is-overview:hover .course-card-cta.is-ghost {
  background: color-mix(in srgb, var(--course-color, var(--primary)) 8%, transparent);
}

@media (max-width: 720px) {
  .course-card.is-overview .course-card-body { padding: 22px 20px 18px; }
  .course-card-badge-emoji { width: 50px; height: 50px; }
  .course-card-badge-emoji .course-card-emoji { font-size: 26px; }
  .course-card.is-overview .course-card-title { font-size: 18px; }
}

/* ===== Course rail (leftmost) ===== */
.rail {
  background: linear-gradient(180deg, #15202b 0%, #0e1721 100%);
  color: #cdd6df;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  scrollbar-width: none;
}
.rail::-webkit-scrollbar { display: none; }

.rail-inner {
  padding: 14px 10px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: stretch;
}

.rail-courses {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rail-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 4px 7px;
  border-radius: 10px;
  text-decoration: none;
  color: #9ba6b3;
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}
.rail-item:hover {
  background: rgba(255, 255, 255, 0.05);
  text-decoration: none;
  color: #fff;
  transform: translateY(-1px);
}
.rail-item:hover .rail-tile { transform: scale(1.04); }

.rail-tile {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.06);
  display: grid;
  place-items: center;
  font-size: 22px;
  line-height: 1;
  transition: background 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}
.rail-emoji { font-size: 22px; line-height: 1; filter: saturate(1.05); }

.rail-label {
  font-size: 10px;
  font-weight: 600;
  text-align: center;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: inherit;
  max-width: 100%;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  word-break: normal;
  overflow-wrap: normal;
  hyphens: none;
}

.rail-item.active { color: #fff; }
.rail-item.active .rail-tile {
  background: linear-gradient(135deg, var(--course-color, var(--primary)) 0%, var(--primary-600) 100%);
  box-shadow: 0 6px 16px -6px var(--course-color, var(--primary)), 0 0 0 1px rgba(255,255,255,0.08) inset;
}
.rail-item.active::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 28px;
  background: #fff;
  border-radius: 0 3px 3px 0;
}

/* ===== Sidebar ===== */
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--line);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(0,0,0,0.12) transparent;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.12); border-radius: 3px; }

/* Drag handle on the right edge of the sidebar. */
.sidebar-resizer {
  position: fixed;
  top: 0;
  bottom: 0;
  left: var(--sidebar-width);
  width: 8px;
  margin-left: -4px;
  cursor: col-resize;
  z-index: 30;
  background: transparent;
  transition: background 0.15s ease;
  touch-action: none;
}
.sidebar-resizer::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 2px;
  height: 36px;
  background: transparent;
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: background 0.15s ease;
}
.sidebar-resizer:hover { background: color-mix(in srgb, var(--primary) 14%, transparent); }
.sidebar-resizer:hover::after { background: var(--primary); }
.sidebar-resizer.dragging { background: color-mix(in srgb, var(--primary) 22%, transparent); }
.sidebar-resizer.dragging::after { background: var(--primary); }
.sidebar-resizer:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: -1px;
}
body.has-topnav .sidebar-resizer { top: 56px; }
@media (max-width: 960px) {
  .sidebar-resizer { display: none; }
}

.sidebar-inner {
  padding: 22px 14px 22px;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 4px 8px 16px;
  font-weight: 600;
  font-size: 15px;
  color: var(--ink-strong);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.brand-emoji { font-size: 18px; line-height: 1; }
.brand:hover { text-decoration: none; }

.search {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  margin-bottom: 14px;
  color: var(--muted);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(28, 160, 241, 0.15);
}
.search input {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  font: inherit;
  font-size: 13px;
  color: var(--ink);
}
.search input::placeholder { color: var(--muted); }

/* Search results panel */
.sidebar[data-mode="results"] .nav,
.sidebar[data-mode="results"] .sidebar-footer { display: none; }
.sidebar[data-mode="nav"] .search-results { display: none; }

.search-results {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0 -4px 8px;
  max-height: calc(100vh - 160px);
  overflow-y: auto;
  padding-right: 2px;
}
.search-result {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  transition: background 0.12s ease;
  border: 1px solid transparent;
}
.search-result:hover {
  background: var(--hover-bg);
  text-decoration: none;
}
.search-result.current { background: var(--hover-bg-strong); border-color: rgba(28,160,241,0.18); }

.search-result .sr-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 13px;
  color: var(--ink-strong);
}
.search-result .sr-head .ico {
  width: 16px;
  display: inline-flex;
  justify-content: center;
  font-size: 13.5px;
  flex-shrink: 0;
}
.search-result .sr-title { flex: 1; min-width: 0; }
.search-result .sr-snippet {
  font-size: 12px;
  line-height: 1.45;
  color: var(--ink-soft);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-result .sr-meta {
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-transform: uppercase;
}
.search-result mark {
  background: rgba(28, 160, 241, 0.20);
  color: inherit;
  padding: 0 2px;
  border-radius: 3px;
}

.search-empty {
  padding: 14px 12px;
  font-size: 13px;
  color: var(--muted);
}
.search-empty strong { color: var(--ink-strong); font-weight: 600; }

.nav { display: flex; flex-direction: column; gap: 2px; }

.nav-group {
  border: 0;
  margin-bottom: 2px;
}
.nav-group > summary {
  list-style: none;
  cursor: pointer;
  padding: 7px 8px;
  font-weight: 600;
  font-size: 13px;
  color: var(--ink-strong);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
  letter-spacing: 0.01em;
}
.nav-group > summary::-webkit-details-marker { display: none; }
.nav-group > summary:hover { background: var(--hover-bg); }

.caret {
  width: 12px;
  height: 12px;
  display: inline-block;
  position: relative;
  flex-shrink: 0;
  color: var(--muted);
}
.caret::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0; height: 0;
  border-left: 4px solid currentColor;
  border-top: 3.5px solid transparent;
  border-bottom: 3.5px solid transparent;
  transform: translate(-50%, -50%);
  transition: transform 0.18s ease;
}
.nav-group[open] > summary .caret::before { transform: translate(-50%, -50%) rotate(90deg); }

.nav-group ul {
  list-style: none;
  margin: 2px 0 6px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.nav-group li a {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 10px 6px 22px;
  font-size: 13px;
  color: var(--ink);
  border-radius: var(--radius-sm);
  text-decoration: none;
  position: relative;
  transition: background 0.12s ease, color 0.12s ease;
}
.nav-group li a:hover {
  background: var(--hover-bg);
  text-decoration: none;
  color: var(--ink-strong);
}
.nav-group li.active a {
  background: var(--hover-bg-strong);
  color: var(--primary-700);
  font-weight: 500;
}
.nav-group li.active a::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 14px;
  background: var(--primary);
  border-radius: 2px;
}
.nav-group .ico {
  display: inline-flex;
  width: 16px;
  justify-content: center;
  font-size: 13.5px;
  line-height: 1;
}
.nav-group .row-title { flex: 1; min-width: 0; }
.nav-group .row-ext,
.nav-flat .row-ext {
  color: var(--muted);
  opacity: 0.7;
  flex-shrink: 0;
}
.nav-group li a:hover .row-ext,
.nav-flat:hover .row-ext { opacity: 1; color: var(--primary); }

/* ===== Completion check on sidebar rows ===== */
.nav-group li .row-check,
.nav-flat .row-check {
  flex-shrink: 0;
  color: #16a34a;
  opacity: 0;
  transform: scale(0.7);
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.nav-group li.completed .row-check,
.nav-flat.completed .row-check {
  opacity: 1;
  transform: scale(1);
}
.nav-flat .row-title { flex: 1; min-width: 0; }

/* ===== Lesson cards (Teaching Tips landing page) ===== */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 8px 0 32px;
}
.lesson-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  text-decoration: none !important;
  border-bottom: 1px solid var(--line) !important;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  box-shadow: var(--shadow-card);
  color: var(--ink-strong);
  position: relative;
  overflow: hidden;
}
.lesson-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(28,160,241,0.04));
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.18s ease;
}
.lesson-card:hover {
  transform: translateY(-2px);
  border-color: rgba(28, 160, 241, 0.35) !important;
  box-shadow: var(--shadow-lift);
}
.lesson-card:hover::before { opacity: 1; }
.lesson-card .lesson-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-600) 100%);
  color: #fff;
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}
.lesson-card .lesson-title {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink-strong);
}
.lesson-card .lesson-meta {
  font-size: 12.5px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 8px;
}
.lesson-card .lesson-ext { color: var(--primary); }

.section-group {
  margin-top: 8px;
  margin-bottom: 28px;
}
.section-group-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}

.nav-flat {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-strong);
  border-radius: var(--radius-sm);
  margin-top: 6px;
  text-decoration: none;
  transition: background 0.12s ease;
}
.nav-flat:hover { background: var(--hover-bg); text-decoration: none; }
.nav-flat.active {
  background: var(--hover-bg-strong);
  color: var(--primary-700);
}
.nav-flat .ico { font-size: 13.5px; }

.sidebar-footer {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}
.quiz-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  font-size: 13px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-600) 100%);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
  box-shadow: 0 4px 12px -4px rgba(28, 160, 241, 0.45);
}
.quiz-link:hover {
  filter: brightness(1.05);
  text-decoration: none;
  transform: translateY(-1px);
}
.quiz-link .ext { margin-left: auto; opacity: 0.85; }

/* Topnav quiz ring (sits in the top-right area) */
.topnav-quiz {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 14px;
  padding: 6px 10px 6px 8px;
  border-radius: 999px;
  background: var(--primary-bg-soft);
  border: 1px solid color-mix(in srgb, var(--primary) 18%, var(--line));
  text-decoration: none;
  color: var(--primary-700);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  transition: background 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}
.topnav-quiz:hover {
  background: var(--primary-bg);
  border-color: color-mix(in srgb, var(--primary) 35%, var(--line));
  text-decoration: none;
  transform: translateY(-1px);
}
.topnav-quiz-icon { font-size: 14px; line-height: 1; }
.topnav-quiz-label { line-height: 1.1; }

/* ===== Main ===== */
.main {
  padding: 80px 64px 96px;
  display: flex;
  justify-content: center;
}
.content {
  width: 100%;
  max-width: var(--content-width);
  animation: fade-up 0.4s ease-out both;
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Eyebrow / breadcrumb label, injected by script.js */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  padding: 4px 10px;
  background: var(--primary-bg);
  border-radius: 999px;
  margin: 0 0 14px;
}

h1 {
  font-size: 46px;
  line-height: 1.1;
  letter-spacing: -0.025em;
  font-weight: 700;
  color: var(--ink-strong);
  margin: 0 0 10px;
}
.title-emoji {
  margin-right: 6px;
  display: inline-block;
}

.divider {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 16px 0 28px;
  opacity: 0.7;
}

.lead {
  font-size: 17.5px;
  line-height: 1.65;
  color: var(--ink-soft);
  margin: 0 0 28px;
}

.section-heading {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink-strong);
  margin: 36px 0 14px;
  letter-spacing: -0.012em;
  line-height: 1.3;
}
.divider + .section-heading { margin-top: 8px; }
.section-heading .hl {
  background: var(--yellow-bg-soft);
  padding: 3px 9px;
  border-radius: 6px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
.section-heading .hl-blue {
  background: var(--primary-bg);
  color: var(--primary-700);
  padding: 3px 9px;
  border-radius: 6px;
}

/* Body rhythm */
.content p { margin: 0 0 16px; }
.content ul,
.content ol { margin: 0 0 20px; padding-left: 22px; }
.content li { margin-bottom: 6px; padding-left: 4px; }
.content li::marker { color: var(--muted); }
.content li > ul,
.content li > ol { margin: 8px 0 8px; }

.content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-strong);
  margin: 28px 0 10px;
  letter-spacing: -0.005em;
}

.content strong { color: var(--ink-strong); font-weight: 600; }

/* Inline code */
.content code {
  background: var(--primary-bg);
  color: var(--primary-700);
  padding: 1.5px 7px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: var(--font-mono);
}

/* Figure / images */
.content figure { margin: 18px 0 26px; }
.content figure img,
.content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  display: block;
  box-shadow: var(--shadow-card);
}
.content figcaption {
  font-size: 13px;
  color: var(--muted);
  margin-top: 8px;
  text-align: center;
}

/* Tables */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 28px;
  font-size: 14.5px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
}
.content thead th {
  text-align: left;
  font-weight: 600;
  color: var(--ink-strong);
  background: var(--line-soft);
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
}
.content tbody td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.content tbody tr:last-child td { border-bottom: 0; }
.content tbody tr:hover td { background: var(--hover-bg); }

/* Columns */
.content .cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
  margin: 10px 0 28px;
}
.content .cols .col { min-width: 0; }

/* Toggle */
.content .toggle {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 13px 16px;
  margin: 0 0 10px;
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
  transition: border-color 0.15s ease;
}
.content .toggle[open] {
  border-color: rgba(28, 160, 241, 0.30);
}
.content .toggle > summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--ink-strong);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
}
.content .toggle > summary::-webkit-details-marker { display: none; }
.content .toggle > summary::before {
  content: "";
  width: 0; height: 0;
  border-left: 5px solid var(--muted);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  transition: transform 0.18s ease;
  flex-shrink: 0;
}
.content .toggle[open] > summary::before {
  transform: rotate(90deg);
  border-left-color: var(--primary);
}
.content .toggle > *:not(summary) { margin-top: 12px; }

/* Blockquote */
.content blockquote {
  border-left: 3px solid var(--primary);
  background: var(--primary-bg-soft);
  padding: 12px 18px;
  color: var(--ink);
  margin: 16px 0 22px;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.content blockquote p:last-child { margin-bottom: 0; }

/* Inline links inside content */
.content a {
  color: var(--primary-700);
  border-bottom: 1px solid rgba(28, 160, 241, 0.30);
  text-decoration: none;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.content a:hover {
  border-bottom-color: var(--primary);
  color: var(--primary);
  text-decoration: none;
}
/* Exceptions */
.content .next-card,
.content .next-card:hover,
.content .prev-card,
.content .prev-card:hover,
.content .callout a { border-bottom: 0; }

/* ===== Video ===== */
.video-wrap {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  margin: 12px 0 32px;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-video);
}
.video-wrap iframe,
.video-wrap video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ===== Callout ===== */
.callout {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background:
    linear-gradient(180deg, var(--primary-bg) 0%, var(--primary-bg-soft) 100%);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 10px 0 32px;
  color: var(--ink);
  position: relative;
  box-shadow: 0 0 0 1px rgba(28, 160, 241, 0.12);
}
.callout::before {
  content: "";
  position: absolute;
  left: 0; top: 12px; bottom: 12px;
  width: 3px;
  background: var(--primary);
  border-radius: 2px;
}
.callout-icon {
  font-size: 20px;
  line-height: 1.4;
  flex-shrink: 0;
}
.callout-body {
  font-size: 15px;
  line-height: 1.6;
}
.callout-body strong { color: var(--ink-strong); }
.callout-body p:last-child { margin-bottom: 0; }

/* ===== Page nav (prev + next) ===== */
.page-nav {
  display: flex;
  gap: 14px;
  margin: 48px 0 0;
}
.page-nav .prev-card,
.page-nav .next-card { flex: 1 1 0; margin: 0; }

.next-card,
.prev-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background 0.18s ease;
  box-shadow: var(--shadow-card);
}
.next-card { margin: 48px 0 0; justify-content: space-between; }
.prev-card { justify-content: flex-start; }

.next-card:hover,
.prev-card:hover {
  transform: translateY(-2px);
  border-color: rgba(28, 160, 241, 0.40);
  box-shadow: var(--shadow-lift);
  text-decoration: none;
  background: linear-gradient(135deg, #fff 0%, var(--primary-bg-soft) 100%);
}

.next-card .next-label,
.prev-card .prev-label {
  display: block;
  color: var(--muted);
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}
.next-card .next-target,
.prev-card .prev-target {
  color: var(--ink-strong);
  font-size: 17px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.01em;
}

.next-card .next-arrow,
.prev-card .prev-arrow {
  flex-shrink: 0;
  color: var(--primary);
  transition: transform 0.18s ease;
}
.next-card:hover .next-arrow { transform: translateX(4px); }
.prev-card:hover .prev-arrow { transform: translateX(-4px); }

.next-card .next-body,
.prev-card .prev-body { display: flex; flex-direction: column; }
.prev-card .prev-body { align-items: flex-start; }

/* ===== Mobile toggle ===== */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 30;
  width: 36px; height: 36px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink-strong);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-card);
}

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .main { padding: 64px 48px 80px; }
}

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .main { padding: 32px 22px 72px; }
  .sidebar {
    position: fixed;
    top: 0; left: 0;
    width: var(--sidebar-width);
    z-index: 30;
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.10);
  }
  body.has-topnav .sidebar { top: 0; height: 100vh; }
  .sidebar.open { transform: translateX(0); }
  .sidebar-toggle {
    display: inline-flex;
    top: 10px;
    right: 12px;
    left: auto;
  }
  .topnav { padding: 8px 60px 8px 16px; gap: 10px; min-height: 52px; }
  .topnav-title { font-size: 14px; padding-left: 12px; gap: 8px; }
  .topnav-emoji { width: 24px; height: 24px; font-size: 14px; }
  .topnav-back { padding: 6px 10px; font-size: 13px; }
  .topnav-progress { min-width: 96px; max-width: 140px; gap: 4px; }
  .topnav-progress-label { font-size: 10.5px; }
  body.has-topnav .sidebar-toggle { top: 8px; }
  h1 { font-size: 34px; }
  .lead { font-size: 16px; }
  .next-card,
  .prev-card { padding: 16px 18px; }
  .next-card .next-target,
  .prev-card .prev-target { font-size: 15px; }
  .page-nav { flex-direction: column; gap: 10px; }
  .home-main { padding: 48px 22px 72px; }
  .home-title { font-size: 38px; }
  .home-lead { font-size: 16px; }
}

/* ===== Quiz page ===== */
.quiz-topnav {
  position: sticky;
  top: 0;
  z-index: 25;
  display: flex;
  align-items: center;
  padding: 10px 22px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
  min-height: 56px;
}
.quiz-main { padding: 60px 48px 72px; }
.quiz-main .quiz-content { max-width: 900px; }
@media (max-width: 1100px) {
  .quiz-main { padding: 48px 36px 60px; }
}
@media (max-width: 960px) {
  .quiz-main { padding: 24px 16px 54px; }
}
.quiz-content { padding-bottom: 60px; }

.quiz-rules { margin: 0; padding-left: 22px; }
.quiz-rules li { margin-bottom: 8px; }
.quiz-rules li:last-child { margin-bottom: 0; }

.quiz-good-luck {
  margin-top: 8px;
  font-size: 17px;
  color: var(--ink-strong);
}

.quiz-progress {
  margin: 8px 0 28px;
}
.quiz-progress-bar {
  height: 6px;
  background: var(--line-soft);
  border-radius: 999px;
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 999px;
  transition: width 0.25s ease;
}
.quiz-progress-label {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.quiz-q-text {
  font-size: 24px;
  line-height: 1.4;
  color: var(--ink-strong);
  margin: 0 0 8px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.quiz-q-num {
  color: var(--primary);
  font-weight: 700;
  margin-right: 6px;
}

.quiz-helper {
  margin: 0 0 20px;
  font-size: 14px;
  color: var(--muted);
  font-weight: 500;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 24px 0 32px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink-strong);
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease, transform 0.05s ease;
}
.quiz-option:hover {
  border-color: rgba(28, 160, 241, 0.45);
  background: var(--primary-bg-soft);
}
.quiz-option:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(28, 160, 241, 0.18);
}
.quiz-option:active { transform: translateY(1px); }

.quiz-option-letter {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--line-soft);
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, color 0.15s ease;
}
.quiz-option-text { flex: 1; line-height: 1.5; }
.quiz-option-check {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.quiz-option.is-selected {
  border-color: var(--primary);
  background: var(--primary-bg);
}
.quiz-option.is-selected .quiz-option-letter {
  background: var(--primary);
  color: #fff;
}
.quiz-option.is-selected .quiz-option-check {
  opacity: 1;
  transform: scale(1);
}

.quiz-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 12px;
  flex-wrap: wrap;
}

.quiz-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid transparent;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.05s ease, box-shadow 0.15s ease;
}
.quiz-btn:active { transform: translateY(1px); }
.quiz-btn:disabled,
.quiz-btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}
.quiz-btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.quiz-btn-primary:hover:not(:disabled) {
  background: var(--primary-600);
  border-color: var(--primary-600);
  box-shadow: 0 4px 14px -4px rgba(28, 160, 241, 0.45);
}
.quiz-btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--line);
}
.quiz-btn-ghost:hover:not(:disabled) {
  background: var(--hover-bg);
  color: var(--ink-strong);
  border-color: var(--muted-soft);
}
.quiz-btn-locked {
  background: var(--line-soft);
  color: var(--ink-soft);
  border-color: var(--line);
}
.quiz-btn-locked:hover:not(:disabled) {
  background: var(--hover-bg);
  color: var(--ink-strong);
  border-color: var(--muted-soft);
}
.quiz-btn-block {
  width: 100%;
  justify-content: center;
}
.quiz-actions-stack {
  flex-direction: column;
  align-items: stretch;
  justify-content: stretch;
}

.quiz-lock-modal {
  position: fixed;
  inset: 0;
  background: rgba(20, 32, 43, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
  animation: quizLockFade 0.15s ease-out;
}
@keyframes quizLockFade {
  from { opacity: 0; }
  to { opacity: 1; }
}
.quiz-lock-modal-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: 0 25px 60px -15px rgba(20, 32, 43, 0.4);
}
.quiz-lock-modal-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary-bg);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}
.quiz-lock-modal-icon-warn {
  background: var(--yellow-bg-soft);
  color: var(--yellow-text);
}
.quiz-lock-modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-strong);
  margin: 0 0 8px;
}
.quiz-lock-modal-body {
  color: var(--ink-soft);
  margin: 0 0 20px;
  line-height: 1.55;
  font-size: 14.5px;
}
.quiz-lock-modal-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quiz-score {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 28px;
  border-radius: var(--radius);
  border: 1.5px solid var(--line);
  background: var(--bg-card);
  margin: 8px 0 24px;
  box-shadow: var(--shadow-card);
}
.quiz-score.is-pass {
  border-color: rgba(34, 169, 122, 0.35);
  background: linear-gradient(135deg, var(--green-bg), #fff 70%);
}
.quiz-score.is-fail {
  border-color: rgba(28, 160, 241, 0.25);
  background: linear-gradient(135deg, var(--primary-bg-soft), #fff 70%);
}
.quiz-score-pct {
  font-size: 56px;
  font-weight: 700;
  color: var(--ink-strong);
  letter-spacing: -0.03em;
  line-height: 1;
}
.quiz-score.is-pass .quiz-score-pct { color: #1f8a5c; }
.quiz-score-meta {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-strong);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.quiz-score-sub {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--muted);
}

.quiz-review {
  list-style: none;
  padding: 0;
  margin: 16px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.quiz-review-item {
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
}
.quiz-review-item.is-correct { border-left-color: #2eaf7d; background: linear-gradient(90deg, var(--green-bg), #fff 30%); }
.quiz-review-item.is-wrong { border-left-color: #d96a8a; background: linear-gradient(90deg, var(--pink-bg), #fff 30%); }

.quiz-review-q {
  font-size: 15px;
  color: var(--ink-strong);
  margin-bottom: 6px;
}
.quiz-review-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  margin-right: 8px;
  vertical-align: -3px;
}
.quiz-review-item.is-correct .quiz-review-mark { background: #2eaf7d; color: #fff; }
.quiz-review-item.is-wrong .quiz-review-mark { background: #d96a8a; color: #fff; }

.quiz-review-a {
  font-size: 14px;
  color: var(--ink-soft);
  margin-left: 28px;
  line-height: 1.5;
}
.quiz-review-label {
  font-weight: 600;
  color: var(--muted);
  margin-right: 4px;
}
.quiz-review-correct { color: #1f8a5c; }
.quiz-review-correct .quiz-review-label { color: #1f8a5c; }

@media (max-width: 600px) {
  .quiz-q-text { font-size: 20px; }
  .quiz-option { padding: 12px 14px; font-size: 14.5px; }
  .quiz-score { flex-direction: column; align-items: flex-start; gap: 8px; padding: 20px; }
  .quiz-score-pct { font-size: 44px; }
  .quiz-actions { justify-content: stretch; }
  .quiz-btn { flex: 1; justify-content: center; }
}

/* ===== Read time pill ===== */
.read-time {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
  margin: -16px 0 22px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.read-time::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238a93a0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cpath d='M12 7v5l3 3'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  flex-shrink: 0;
}

/* ===== Key Learnings checklist ===== */
.key-learnings {
  background: var(--primary-bg-soft);
  border: 1px solid color-mix(in srgb, var(--primary) 18%, var(--line));
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 36px 0 0;
}
.key-learnings-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.key-learnings-icon { font-size: 16px; line-height: 1; }
.key-learnings-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary-700);
}
.key-learnings-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.kl-item label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  font-size: 14.5px;
  color: var(--ink);
  line-height: 1.55;
  transition: color 0.15s ease;
}
.kl-item input[type="checkbox"] {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 3px;
  accent-color: var(--primary);
  cursor: pointer;
  border-radius: 3px;
}
.kl-item.is-checked label {
  color: var(--muted);
}
.kl-item.is-checked label span {
  text-decoration: line-through;
  text-decoration-color: var(--muted-soft);
}
.kl-progress {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid color-mix(in srgb, var(--primary) 12%, var(--line));
  display: flex;
  align-items: center;
  gap: 10px;
}
.kl-progress-bar-wrap {
  flex: 1;
  height: 4px;
  background: color-mix(in srgb, var(--primary) 15%, transparent);
  border-radius: 99px;
  overflow: hidden;
}
.kl-progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 99px;
  transition: width 0.3s ease;
}
.kl-progress-label {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}

/* ===== Section complete celebration modal ===== */
.section-celebration {
  position: fixed;
  inset: 0;
  z-index: 9100;
  background: rgba(20, 32, 43, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
  padding: 24px;
}
.section-celebration.is-visible { opacity: 1; }
.section-celebration-card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 40px 44px;
  max-width: 400px;
  width: 100%;
  text-align: center;
  box-shadow: 0 32px 80px rgba(20, 32, 43, 0.22);
  transform: scale(0.88) translateY(12px);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  border: 1px solid var(--line);
}
.section-celebration.is-visible .section-celebration-card {
  transform: scale(1) translateY(0);
}
.section-celebration-emoji {
  font-size: 52px;
  line-height: 1;
  margin-bottom: 18px;
  display: block;
}
.section-celebration-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink-strong);
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}
.section-celebration-body {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.55;
  margin: 0 0 28px;
}
.section-celebration-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}
.section-celebration-btn:hover { background: var(--primary-600); }
.section-celebration-btn:active { transform: scale(0.97); }

/* ===== Copy-to-clipboard button on template toggles ===== */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-left: auto;
  flex-shrink: 0;
  padding: 3px 9px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-xs);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink-soft);
  cursor: pointer;
  font-family: var(--font);
  letter-spacing: 0.01em;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  line-height: 1;
}
.copy-btn:hover {
  background: var(--hover-bg-strong);
  color: var(--primary-700);
  border-color: color-mix(in srgb, var(--primary) 30%, var(--line));
}
.copy-btn.is-copied {
  background: var(--green-bg);
  color: var(--green-strong);
  border-color: var(--green-soft);
}

/* ===== Next card section label ===== */
.next-section-tag {
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--primary);
  margin-top: 3px;
  display: block;
}

/* Print: hide chrome, light layout */
@media print {
  .sidebar, .sidebar-toggle, .topnav, .next-card, .prev-card, .page-nav, .video-wrap { display: none; }
  .main { padding: 0; }
  body { background: white; }
}