/* ============================================================
   Curriculum - 3-column sticky layout
   ============================================================ */

:root {
  --curr-nav-width: 260px;
  --curr-toc-width: 220px;
  --curr-bg: #f6f9ff;
  --curr-border: rgba(37, 99, 235, 0.15);
  --curr-ink: #1e3a5f;
  --curr-muted: #58708b;
  --curr-accent: #2563eb;
  --curr-complete: #16a34a;
}

.curriculum-page {
  font-family: 'Manrope', 'Zen Kaku Gothic New', sans-serif;
  background: var(--curr-bg);
  color: var(--curr-ink);
}

.curriculum-main {
  padding-top: 64px;
  min-height: 100vh;
}

/* ── 3-column grid ── */
.curriculum-shell {
  display: grid;
  grid-template-columns: var(--curr-nav-width) minmax(0, 840px) var(--curr-toc-width);
  grid-template-areas: "nav content toc";
  justify-content: center;
  align-items: start;
}

/* ── Left nav ── */
.curriculum-nav {
  grid-area: nav;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  border-right: 1px solid var(--curr-border);
  padding: 16px 0 40px;
  background: #fff;
}

.curr-nav-track-title {
  padding: 12px 16px 8px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--curr-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--curr-border);
  margin-bottom: 8px;
}

.curr-nav-stage {
  padding: 10px 16px 4px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--curr-muted);
  margin-top: 8px;
}

.curr-nav-page {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 7px 16px;
  font-size: 0.82rem;
  color: var(--curr-ink);
  background: none;
  border: none;
  border-left: 3px solid transparent;
  width: 100%;
  text-align: left;
  cursor: pointer;
  line-height: 1.4;
  transition: background 0.1s;
  text-decoration: none;
}

.curr-nav-page:hover {
  background: rgba(37, 99, 235, 0.05);
}

.curr-nav-page.is-active {
  border-left-color: var(--curr-accent);
  color: var(--curr-accent);
  font-weight: 600;
  background: rgba(37, 99, 235, 0.06);
}

.curr-nav-check {
  flex-shrink: 0;
  font-size: 0.7rem;
  margin-top: 2px;
  color: #d1d5db;
}

.curr-nav-page.is-complete .curr-nav-check {
  color: var(--curr-complete);
}

/* ── Main content ── */
.curriculum-content-wrap {
  grid-area: content;
  position: relative;
  padding: 32px 48px 80px;
  min-width: 0;
}

.curriculum-content-wrap.is-preview-gated .curr-complete-bar {
  opacity: 0.38;
  pointer-events: none;
}

.curriculum-content-wrap.is-preview-clipped .curriculum-content {
  position: relative;
  max-height: calc((var(--curr-preview-lines, 28) * 1.85em) + 5.5rem);
  overflow: hidden;
}

.curriculum-content-wrap.is-preview-clipped .curriculum-content::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 220px;
  background: linear-gradient(
    to bottom,
    rgba(246, 249, 255, 0) 0%,
    rgba(246, 249, 255, 0.78) 46%,
    rgba(246, 249, 255, 0.98) 100%
  );
}

.curr-preview-inline-gate {
  margin-top: 18px;
  display: flex;
  justify-content: center;
}

.curr-preview-inline-gate-card {
  width: min(640px, 100%);
  border-radius: 16px;
  border: 1px solid rgba(37, 99, 235, 0.2);
  background: #ffffff;
  box-shadow: 0 12px 28px rgba(30, 58, 95, 0.12);
  padding: 22px 20px;
  text-align: center;
}

.curr-preview-inline-gate-card h3 {
  margin: 0;
  font-size: 1.08rem;
  color: var(--curr-ink);
}

.curr-preview-inline-gate-card p {
  margin: 10px 0 0;
  color: var(--curr-muted);
  line-height: 1.7;
}

.curr-preview-inline-gate-actions {
  margin-top: 16px;
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.curr-preview-inline-gate-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 18px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 700;
}

.curr-preview-inline-gate-btn--primary {
  background: var(--curr-accent);
  color: #fff;
}

.curr-preview-inline-gate-btn--primary:hover {
  background: #1d4ed8;
}

.curr-preview-inline-gate-btn--secondary {
  color: var(--curr-accent);
  border: 1px solid rgba(37, 99, 235, 0.35);
  background: #fff;
}

.curr-preview-inline-gate-btn--secondary:hover {
  background: rgba(37, 99, 235, 0.08);
}

.curr-preview-gate {
  position: absolute;
  inset: 0;
  z-index: 12;
  background: rgba(255, 255, 255, 0.26);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 110px 20px 24px;
  pointer-events: none;
}

.curr-preview-gate-card {
  pointer-events: auto;
  width: min(560px, 100%);
  border-radius: 16px;
  border: 1px solid rgba(37, 99, 235, 0.2);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 28px rgba(30, 58, 95, 0.14);
  padding: 24px 22px;
  text-align: center;
}

.curr-preview-gate-card h3 {
  margin: 0;
  font-size: 1.12rem;
  color: var(--curr-ink);
}

.curr-preview-gate-card p {
  margin: 10px 0 0;
  color: var(--curr-muted);
  line-height: 1.7;
}

.curr-preview-gate-actions {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.curr-preview-gate-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 18px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 700;
}

.curr-preview-gate-btn--primary {
  background: var(--curr-accent);
  color: #fff;
}

.curr-preview-gate-btn--primary:hover {
  background: #1d4ed8;
}

.curr-preview-gate-btn--secondary {
  color: var(--curr-accent);
  border: 1px solid rgba(37, 99, 235, 0.35);
  background: rgba(255, 255, 255, 0.85);
}

.curr-preview-gate-btn--secondary:hover {
  background: rgba(37, 99, 235, 0.08);
}

.curr-status {
  padding: 12px 0;
  color: var(--curr-muted);
  font-size: 0.9rem;
}

.curr-status[data-tone="error"] {
  color: #b91c1c;
}

/* Markdown content styles */
.curriculum-content h1 {
  font-size: 1.75rem;
  margin: 0 0 10px;
  line-height: 1.3;
}

.curriculum-content .page-meta {
  display: flex;
  gap: 12px;
  color: var(--curr-muted);
  font-size: 0.82rem;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--curr-border);
}

.curriculum-content h2 {
  font-size: 1.25rem;
  margin: 2.2rem 0 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--curr-border);
  scroll-margin-top: 80px;
}

.curriculum-content h3 {
  font-size: 1.05rem;
  margin: 1.6rem 0 0.5rem;
  scroll-margin-top: 80px;
}

.curriculum-content p {
  line-height: 1.85;
  margin: 0 0 1rem;
}

.curriculum-content ul,
.curriculum-content ol {
  padding-left: 1.5rem;
  margin: 0 0 1rem;
  line-height: 1.8;
}

.curriculum-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.2rem 0;
  font-size: 0.875rem;
}

.curriculum-content th,
.curriculum-content td {
  border: 1px solid var(--curr-border);
  padding: 8px 12px;
  text-align: left;
}

.curriculum-content th {
  background: rgba(37, 99, 235, 0.06);
  font-weight: 600;
}

.curriculum-content img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  margin: 1rem auto;
}

.curriculum-content code {
  background: rgba(37, 99, 235, 0.08);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: 'Courier New', monospace;
}

.curriculum-content pre {
  background: #1e2e3f;
  color: #e2e8f0;
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1rem 0;
}

.curriculum-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.875rem;
}

.curriculum-content details {
  border: 1px solid var(--curr-border);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 1rem 0;
}

.curriculum-content summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--curr-accent);
  padding: 4px 0;
}

.curriculum-content blockquote {
  border-left: 4px solid var(--curr-accent);
  margin: 1rem 0;
  padding: 8px 16px;
  color: var(--curr-muted);
  background: rgba(37, 99, 235, 0.04);
  border-radius: 0 8px 8px 0;
}

.curriculum-content hr {
  border: none;
  border-top: 1px solid var(--curr-border);
  margin: 2rem 0;
}

/* ── Completion bar ── */
.curr-complete-bar {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--curr-border);
  display: flex;
  align-items: center;
  gap: 16px;
}

.curr-complete-btn {
  padding: 10px 24px;
  background: var(--curr-accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 0.15s;
}

.curr-complete-btn:hover:not(:disabled) {
  background: #1d4ed8;
}

.curr-complete-btn:disabled {
  background: var(--curr-complete);
  cursor: default;
}

.curr-complete-msg {
  font-size: 0.85rem;
  color: var(--curr-complete);
}

/* ── Previous / next page navigation ── */
.curr-page-neighbor-nav {
  margin-top: 18px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 12px;
}

.curr-page-neighbor {
  min-height: 76px;
  padding: 14px 16px;
  border: 1px solid var(--curr-border);
  border-radius: 14px;
  background: #fff;
  color: var(--curr-ink);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.06);
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.curr-page-neighbor:hover {
  border-color: rgba(37, 99, 235, 0.34);
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.1);
  transform: translateY(-1px);
  text-decoration: none;
}

.curr-page-neighbor--previous {
  align-items: flex-start;
  text-align: left;
}

.curr-page-neighbor--next {
  align-items: flex-end;
  text-align: right;
}

.curr-page-neighbor-label {
  color: var(--curr-accent);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.curr-page-neighbor--previous .curr-page-neighbor-label::before {
  content: '← ';
}

.curr-page-neighbor--next .curr-page-neighbor-label::after {
  content: ' →';
}

.curr-page-neighbor-title {
  font-size: 0.9rem;
  font-weight: 800;
  line-height: 1.45;
}

.curr-page-neighbor.is-disabled {
  opacity: 0.42;
  background: rgba(255, 255, 255, 0.55);
  box-shadow: none;
  color: var(--curr-muted);
}

/* ── Paywall ── */
.curr-paywall {
  margin: 2rem 0;
  border: 1px solid var(--curr-border);
  border-radius: 12px;
  padding: 36px 32px;
  text-align: center;
  background: linear-gradient(180deg, #fff 0%, #f0f6ff 100%);
}

.curr-paywall h3 {
  margin: 0 0 12px;
  font-size: 1.2rem;
}

.curr-paywall p {
  color: var(--curr-muted);
  margin: 0 0 20px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.curr-paywall-btn {
  display: inline-block;
  padding: 12px 28px;
  background: var(--curr-accent);
  color: #fff;
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
  font-size: 1rem;
  transition: background 0.15s;
}

.curr-paywall-btn:hover {
  background: #1d4ed8;
}

/* ── Right TOC ── */
.curriculum-toc {
  grid-area: toc;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  padding: 24px 14px 40px;
  border-left: 1px solid var(--curr-border);
  background: #fff;
}

.curr-toc-title {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--curr-muted);
  margin-bottom: 10px;
}

.curr-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.curr-toc-item {
  margin-bottom: 2px;
}

.curr-toc-link {
  display: block;
  font-size: 0.78rem;
  color: var(--curr-muted);
  text-decoration: none;
  padding: 3px 0 3px 8px;
  border-left: 2px solid transparent;
  line-height: 1.45;
  transition: color 0.1s, border-color 0.1s;
}

.curr-toc-link:hover,
.curr-toc-link.is-active {
  color: var(--curr-accent);
  border-left-color: var(--curr-accent);
}

.curr-toc-item.is-h3 .curr-toc-link {
  padding-left: 16px;
  font-size: 0.73rem;
}

.curr-toc-list.is-locked .curr-toc-link {
  pointer-events: none;
  cursor: not-allowed;
  color: #94a3b8;
  border-left-color: transparent;
}

.curr-toc-list.is-locked .curr-toc-link.is-active {
  color: #94a3b8;
  border-left-color: transparent;
}

/* ============================================================
   Curriculum Hub Page
   ============================================================ */

.curriculum-hub-main {
  padding-top: 64px;
  min-height: 100vh;
  background: var(--curr-bg);
}

.curriculum-hub-shell {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.curriculum-hub-hero {
  margin-bottom: 40px;
}

.curriculum-hub-hero h1 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--curr-ink);
  margin: 0 0 10px;
}

.curriculum-hub-hero p {
  color: var(--curr-muted);
  font-size: 0.95rem;
  margin: 0;
  line-height: 1.7;
}

.curriculum-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.curriculum-card {
  background: #fff;
  border: 1px solid var(--curr-border);
  border-radius: 14px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: box-shadow 0.15s, transform 0.15s;
}

.curriculum-card:hover {
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.1);
  transform: translateY(-2px);
}

.curriculum-card-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.curriculum-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.curriculum-badge--level {
  background: rgba(37, 99, 235, 0.1);
  color: var(--curr-accent);
}

.curriculum-badge--count {
  background: rgba(22, 163, 74, 0.1);
  color: #15803d;
}

.curriculum-card-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--curr-ink);
  margin: 0;
  line-height: 1.3;
}

.curriculum-card-desc {
  font-size: 0.875rem;
  color: var(--curr-muted);
  line-height: 1.75;
  margin: 0;
}

.curriculum-card-stages {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.curriculum-card-stages li {
  font-size: 0.8rem;
  color: var(--curr-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.curriculum-card-stages li::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--curr-accent);
  opacity: 0.5;
  flex-shrink: 0;
}

.curriculum-card-footer {
  margin-top: auto;
  padding-top: 4px;
}

.curriculum-card-btn {
  display: inline-block;
  padding: 10px 24px;
  background: var(--curr-accent);
  color: #fff;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.15s;
}

.curriculum-card-btn:hover {
  background: #1d4ed8;
  color: #fff;
  text-decoration: none;
}

@media (max-width: 600px) {
  .curriculum-hub-shell {
    padding: 28px 16px 60px;
  }

  .curriculum-hub-hero h1 {
    font-size: 1.4rem;
  }
}

/* ── Mobile ── */
@media (max-width: 1024px) {
  .curriculum-shell {
    grid-template-columns: var(--curr-nav-width) 1fr;
    grid-template-areas: "nav content";
  }

  .curriculum-toc {
    display: none;
  }
}

@media (max-width: 720px) {
  .curriculum-shell {
    grid-template-columns: 1fr;
    grid-template-areas: "content";
  }

  .curriculum-nav {
    display: none;
  }

  .curriculum-content-wrap {
    padding: 20px 16px 60px;
  }

  .curr-complete-bar {
    align-items: stretch;
    flex-direction: column;
    gap: 10px;
  }

  .curr-complete-btn {
    justify-content: center;
    width: 100%;
  }

  .curr-page-neighbor-nav {
    grid-template-columns: 1fr;
    margin-top: 14px;
  }

  .curr-page-neighbor {
    min-height: 64px;
  }

  .curr-page-neighbor--next {
    align-items: flex-start;
    text-align: left;
  }
}