:root {
  --ck-blue: #2563eb;
  --ck-blue-deep: #1d4ed8;
  --ck-blue-50: #eff6ff;
  --ck-green: #10b981;
  --ck-green-50: #ecfdf5;
  --ck-ink: #0f172a;
  --ck-text: #1e293b;
  --ck-muted: #64748b;
  --ck-bg: #f8fafc;
  --ck-bg-alt: #f1f5f9;
  --ck-white: #ffffff;
  --ck-line: #e2e8f0;
  --ck-r-btn: 10px;
  --ck-r-card: 16px;
  --ck-r-panel: 20px;
  --ck-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --header-h: 0px;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html, body { min-height: 100%; }
body {
  font-family: var(--ck-font);
  color: var(--ck-text);
  background: var(--ck-bg);
  line-height: 1.5;
}
img { max-width: 100%; display: block; }
a { color: var(--ck-blue); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; cursor: pointer; }

.wrap { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }

/* Header — CloudKlass umbrella */
.site-header {
  background: var(--ck-white);
  border-bottom: 1px solid var(--ck-line);
  position: sticky;
  top: 0;
  z-index: 40;
}
.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand img { width: 36px; height: 36px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-weight: 800; color: var(--ck-ink); font-size: 1rem; }
.brand-name span { color: var(--ck-blue); }
.brand-sub { font-size: 0.72rem; color: var(--ck-muted); font-weight: 500; }
.header-links { display: flex; gap: 14px; font-size: 0.875rem; font-weight: 600; }
.header-links a { color: var(--ck-text); }
.offline-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #065f46;
  background: var(--ck-green-50);
  border: 1px solid #a7f3d0;
  border-radius: 999px;
  padding: 4px 10px;
}
.offline-chip.is-offline {
  color: #92400e;
  background: #fffbeb;
  border-color: #fde68a;
}
.offline-chip .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ck-green);
}
.offline-chip.is-offline .dot { background: #f59e0b; }

/* Catalog */
.hero {
  padding: 40px 0 28px;
  background: linear-gradient(180deg, var(--ck-blue-50) 0%, var(--ck-bg) 100%);
}
.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ck-blue);
  margin-bottom: 10px;
}
.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--ck-ink);
  letter-spacing: -0.02em;
  max-width: 18ch;
}
.hero h1 em { font-style: normal; color: var(--ck-blue); }
.hero .lede {
  margin-top: 12px;
  max-width: 42rem;
  color: var(--ck-muted);
  font-size: 1.05rem;
}
.rule {
  width: 48px; height: 4px; border-radius: 4px;
  background: var(--ck-blue); margin: 16px 0 0;
}

.section { padding: 12px 0 48px; }
.section h2 { font-size: 1.15rem; font-weight: 700; color: var(--ck-ink); margin-bottom: 16px; }

.card-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 720px) {
  .card-grid { grid-template-columns: 1fr 1fr; }
}

.resource-card {
  background: var(--ck-white);
  border: 1px solid var(--ck-line);
  border-radius: var(--ck-r-card);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
  display: flex;
  flex-direction: column;
}
.resource-card .strip {
  height: 6px;
  background: linear-gradient(90deg, var(--ck-blue), var(--ck-green));
}
.resource-card .body { padding: 20px 20px 16px; flex: 1; }
.resource-card .type {
  font-size: 0.72rem; font-weight: 700; color: var(--ck-blue);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.resource-card h3 { margin: 6px 0 8px; font-size: 1.2rem; color: var(--ck-ink); }
.resource-card p { color: var(--ck-muted); font-size: 0.92rem; }
.pills { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.pill {
  font-size: 0.75rem; font-weight: 600; color: var(--ck-text);
  background: var(--ck-bg-alt); border-radius: 999px; padding: 4px 10px;
}
.resource-card .cta {
  display: block;
  margin: 0 20px 20px;
  text-align: center;
  background: var(--ck-blue);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 12px 16px;
  border-radius: var(--ck-r-btn);
  text-decoration: none;
}
.resource-card .cta:hover { background: var(--ck-blue-deep); text-decoration: none; }

.coming {
  opacity: 0.72;
  border-style: dashed;
}
.coming .cta {
  background: var(--ck-bg-alt);
  color: var(--ck-muted);
  pointer-events: none;
}

/* Guide chrome */
.guide-header .site-header-inner { padding: 8px 0 6px; }
.guide-bar {
  background: var(--ck-white);
  border-bottom: 1px solid var(--ck-line);
}
.selectors { display: flex; gap: 8px; padding: 8px 0 6px; }
select.ck-select {
  flex: 1;
  border: 1px solid var(--ck-line);
  background: var(--ck-bg);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ck-ink);
}
.day-row {
  display: flex;
  gap: 6px;
  padding: 0 0 10px;
  overflow-x: auto;
}
.day-btn {
  flex: 1;
  min-width: 56px;
  border: 1px solid var(--ck-line);
  background: var(--ck-white);
  border-radius: 10px;
  padding: 8px 6px;
  font-size: 0.78rem;
  color: var(--ck-muted);
}
.day-btn strong { display: block; color: var(--ck-ink); font-size: 0.85rem; }
.day-btn.active {
  border-color: var(--ck-blue);
  background: var(--ck-blue-50);
  color: var(--ck-blue);
}
.day-btn.active strong { color: var(--ck-blue-deep); }

.timer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 0 10px;
}
.timer-clock {
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--ck-ink);
}
.timer-meta { font-size: 0.75rem; color: var(--ck-muted); }
.btn {
  border: 0;
  border-radius: var(--ck-r-btn);
  padding: 8px 14px;
  font-weight: 700;
  font-size: 0.85rem;
}
.btn-primary { background: var(--ck-blue); color: #fff; }
.btn-primary:hover { background: var(--ck-blue-deep); }
.btn-ghost {
  background: var(--ck-bg-alt);
  color: var(--ck-text);
  border: 1px solid var(--ck-line);
}
.timer-track { height: 4px; background: var(--ck-line); border-radius: 4px; }
.timer-fill { height: 100%; width: 0; background: var(--ck-blue); border-radius: 4px; }

.lesson-hero {
  padding: 16px 0 8px;
}
.lesson-hero h1 { font-size: 1.15rem; color: var(--ck-ink); }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.badge {
  font-size: 0.75rem; font-weight: 700;
  background: var(--ck-blue-50); color: var(--ck-blue-deep);
  border-radius: 999px; padding: 4px 10px;
}
.badge.green { background: var(--ck-green-50); color: #065f46; }
.note {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--ck-muted);
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 10px;
  padding: 8px 10px;
}

.pages { display: flex; flex-direction: column; gap: 12px; padding-bottom: 16px; }
.page-card {
  background: #fff;
  border: 1px solid var(--ck-line);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.05);
}
.page-card img { width: 100%; height: auto; }
.page-label {
  font-size: 0.72rem; font-weight: 700; color: var(--ck-muted);
  padding: 6px 10px; background: var(--ck-bg-alt);
  border-top: 1px solid var(--ck-line);
}

.drawer {
  background: #fff;
  border: 1px solid var(--ck-line);
  border-radius: var(--ck-r-card);
  margin: 8px 0 24px;
}
.drawer summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 16px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
}
.drawer summary::-webkit-details-marker { display: none; }
.drawer .inner { padding: 0 12px 14px; display: flex; flex-direction: column; gap: 10px; }

/* Attribution — kept visually separate from CloudKlass chrome */
.funder-band {
  background: #fff;
  border-top: 1px solid var(--ck-line);
  padding: 18px 0;
}
.funder-band img.funder-lockup {
  max-width: min(640px, 100%);
  height: auto;
  margin-bottom: 10px;
}
.funder-band p {
  font-size: 0.78rem;
  color: var(--ck-muted);
  max-width: 720px;
  line-height: 1.55;
}
.funder-band p strong { color: var(--ck-text); font-weight: 600; }

.site-footer {
  background: var(--ck-bg-alt);
  border-top: 1px solid var(--ck-line);
  padding: 20px 0 28px;
  font-size: 0.8rem;
  color: var(--ck-muted);
}
.site-footer .foot-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: center;
  justify-content: space-between;
}
.site-footer .legal { margin-top: 8px; }

.attr-page { padding: 28px 0 48px; }
.attr-page h1 { font-size: 1.6rem; margin-bottom: 8px; }
.attr-page h2 { font-size: 1.05rem; margin: 22px 0 8px; }
.attr-page p, .attr-page li { color: var(--ck-text); font-size: 0.95rem; margin-bottom: 10px; }
.attr-page ul { padding-left: 1.2rem; }

.toast {
  position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%);
  background: var(--ck-ink); color: #fff; font-size: 0.85rem; font-weight: 600;
  padding: 10px 14px; border-radius: 10px; display: none; z-index: 80;
}
.toast.show { display: block; }

@media print {
  .site-header, .guide-bar, .timer-bar, .btn, .header-links { display: none !important; }
  .page-card { break-inside: avoid; box-shadow: none; }
}