/* ============================================================
   paper-example.css  —  Paper / Study Guide Page
   Version: 2.0 | March 2026
   Requires: paperdue.css loaded first
   Used on: /study-guide/* and /paper-example/* routes
   ============================================================ */


/* ────────────────────────────────────────────────
   PAGE LAYOUT
──────────────────────────────────────────────── */
.pe-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 60px;
  display: grid;
  grid-template-columns: 1fr 268px;
  gap: 24px;
  align-items: start;
}
.pe-main { min-width: 0; }
.pe-sidebar {
  position: sticky;
  top: 78px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}


/* ────────────────────────────────────────────────
   PAPER HEADER CARD
──────────────────────────────────────────────── */
.pe-header {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-r-lg);
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: var(--pd-shadow-sm);
}

.pe-badge-row {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.pe-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: .03em;
}
.pe-badge-type     { background: #eaeffa; color: #2a4fa8; border: 1px solid #c5d3f5; }
.pe-badge-level    { background: var(--pd-green-lt); color: var(--pd-green); border: 1px solid #b3e8cc; }
.pe-badge-words    { background: #f5f5f8; color: var(--pd-ink3); border: 1px solid var(--pd-border); }
.pe-badge-verified {
  background: #fff8ee;
  color: #b06000;
  border: 1px solid #f5d898;
  display: flex;
  align-items: center;
  gap: 4px;
}
.pe-badge-verified::before { content: '✓'; color: var(--pd-orange); font-size: 10px; }

.pe-title {
  font-size: 23px;
  font-weight: 800;
  color: var(--pd-navy);
  line-height: 1.28;
  letter-spacing: -.3px;
  margin-bottom: 12px;
}

.pe-meta {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--pd-ink3);
}
.pe-meta span { display: flex; align-items: center; gap: 5px; }
.pe-meta-icon { width: 14px; height: 14px; opacity: .6; }


/* ────────────────────────────────────────────────
   PROGRESS STRIP
──────────────────────────────────────────────── */
.pe-progress {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-r);
  padding: 12px 16px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12.5px;
  color: var(--pd-ink3);
}
.pe-progress-label { font-weight: 600; color: var(--pd-ink2); white-space: nowrap; }
.pe-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--pd-border);
  border-radius: 99px;
  overflow: hidden;
}
.pe-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #2a4fa8 0%, var(--pd-orange) 100%);
  border-radius: 99px;
  transition: width .3s ease;
}
.pe-progress-cta {
  font-size: 12px;
  font-weight: 600;
  color: var(--pd-orange);
  cursor: pointer;
  white-space: nowrap;
}
.pe-progress-cta:hover { text-decoration: underline; }


/* ────────────────────────────────────────────────
   ABSTRACT (PAPER OVERVIEW)
──────────────────────────────────────────────── */
.pe-abstract {
  background: #f0f5ff;
  border: 1px solid #cdd8f8;
  border-left: 3px solid var(--pd-blue);
  border-radius: 0 var(--pd-r-lg) var(--pd-r-lg) 0;
  padding: 18px 20px;
  margin-bottom: 16px;
}
.pe-section-eyebrow {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--pd-blue);
  margin-bottom: 10px;
}
.pe-abstract p {
  font-family: 'Lora', Georgia, serif;
  font-size: 14px;
  line-height: 1.85;
  color: var(--pd-ink2);
}
.pe-abstract a {
  color: var(--pd-blue);
  border-bottom: 1px dotted var(--pd-blue);
  text-decoration: none;
}
.pe-abstract a:hover { border-bottom-style: solid; text-decoration: none; }


/* ────────────────────────────────────────────────
   WRITING GUIDE (collapsible)
──────────────────────────────────────────────── */
.pe-guide {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-top: 3px solid var(--pd-orange);
  border-radius: 0 0 var(--pd-r-lg) var(--pd-r-lg);
  margin-bottom: 16px;
  overflow: hidden;
}
.pe-guide-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  transition: background .12s;
}
.pe-guide-header:hover { background: #fdf8f5; }
.pe-guide-eyebrow {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--pd-orange);
  margin-bottom: 2px;
}
.pe-guide-title { font-size: 14.5px; font-weight: 700; color: var(--pd-ink); }
.pe-guide-chevron {
  font-size: 18px;
  color: var(--pd-ink3);
  transition: transform .2s;
  flex-shrink: 0;
  font-style: normal;
}
.pe-guide-chevron.open { transform: rotate(180deg); }
.pe-guide-body { padding: 0 20px 20px; display: none; }
.pe-guide-body.open { display: block; }
.pe-guide-intro {
  font-size: 13.5px;
  color: var(--pd-ink2);
  line-height: 1.75;
  margin-bottom: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--pd-border);
}
.pe-guide-section { margin-bottom: 14px; }
.pe-guide-section h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--pd-navy);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.pe-guide-section h4::before {
  content: '';
  display: block;
  width: 3px;
  height: 14px;
  background: var(--pd-orange);
  border-radius: 2px;
  flex-shrink: 0;
}
.pe-guide-section p,
.pe-guide-section li { font-size: 13px; color: var(--pd-ink2); line-height: 1.75; }
.pe-guide-section ul { padding-left: 18px; }
.pe-guide-section li { margin-bottom: 4px; }


/* ────────────────────────────────────────────────
   ESSAY CARD + BODY TYPOGRAPHY
──────────────────────────────────────────────── */
.pe-essay-card {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-r-lg);
  overflow: hidden;
  box-shadow: var(--pd-shadow-sm);
}
.pe-essay-header {
  padding: 14px 24px;
  background: #fafbff;
  border-bottom: 1px solid var(--pd-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.pe-essay-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--pd-ink3);
}
.pe-essay-stats { font-size: 11.5px; color: var(--pd-ink4); }

.pe-essay-body {
  font-family: 'Lora', Georgia, 'Times New Roman', serif;
  font-size: 16px;
  line-height: 2;
  color: #222;
  padding: 32px 36px 24px;
}
.pe-essay-body h2 {
  font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--pd-navy);
  margin: 28px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--pd-border);
  letter-spacing: -.1px;
}
.pe-essay-body h2:first-child { margin-top: 0; }
.pe-essay-body p { margin-bottom: 18px; }
.pe-essay-body p:last-child { margin-bottom: 0; }

/* Essay body links — first occurrence per section */
.pe-essay-link {
  color: var(--pd-blue);
  border-bottom: 1px dotted var(--pd-blue);
  text-decoration: none;
}
.pe-essay-link:hover { border-bottom-style: solid; text-decoration: none; }


/* ────────────────────────────────────────────────
   FADE + GATE
──────────────────────────────────────────────── */
.pe-fade-wrap { position: relative; }
.pe-content-fade {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 140px;
  background: linear-gradient(to bottom, rgba(255,255,255,0) 0%, rgba(255,255,255,.97) 100%);
  pointer-events: none;
}

.pe-gate {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-top: none;
  border-radius: 0 0 var(--pd-r-lg) var(--pd-r-lg);
  padding: 32px 36px 36px;
  box-shadow: var(--pd-shadow);
}
.pe-gate-notice {
  background: #fff8ee;
  border: 1px solid #f5d898;
  border-radius: var(--pd-r);
  padding: 10px 16px;
  font-size: 12.5px;
  color: #b06000;
  font-weight: 600;
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.pe-gate-notice::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--pd-orange);
  border-radius: 50%;
  flex-shrink: 0;
}
.pe-gate-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--pd-navy);
  line-height: 1.25;
  margin-bottom: 8px;
  letter-spacing: -.3px;
}
.pe-gate-sub {
  font-size: 14.5px;
  color: var(--pd-ink2);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 520px;
}
.pe-gate-price {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 20px;
}
.pe-gate-price-main  { font-size: 28px; font-weight: 800; color: var(--pd-navy); }
.pe-gate-price-note  { font-size: 13.5px; color: var(--pd-ink3); }
.pe-gate-price-cross { font-size: 15px; color: var(--pd-ink4); text-decoration: line-through; }

.pe-gate-benefits { display: flex; flex-wrap: wrap; gap: 14px; }
.pe-gate-benefit {
  font-size: 12.5px;
  color: var(--pd-ink3);
  display: flex;
  align-items: center;
  gap: 5px;
}
.pe-gate-benefit::before { content: '✓'; color: var(--pd-green); font-weight: 700; font-size: 12px; }


/* ────────────────────────────────────────────────
   KEY CONCEPTS
──────────────────────────────────────────────── */
.pe-concepts {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-r-lg);
  padding: 18px 20px;
  margin-top: 20px;
  box-shadow: var(--pd-shadow-sm);
}
.pe-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.pe-tag {
  background: #f0f3fb;
  color: var(--pd-blue);
  border: 1px solid #cdd8f8;
  font-size: 12px;
  font-weight: 500;
  padding: 4px 11px;
  border-radius: 4px;
  transition: all .12s;
  cursor: default;
  text-decoration: none;
  display: inline-block;
}
.pe-tag:hover { background: #e0eaff; border-color: var(--pd-blue); }

/* Linked concept tag — has a topic page, acts as nav link */
.pe-tag-linked {
  cursor: pointer;
  position: relative;
}
.pe-tag-linked:hover {
  background: var(--pd-blue);
  color: #fff;
  border-color: var(--pd-blue);
  text-decoration: none;
}


/* ────────────────────────────────────────────────
   RELATED TOPICS
──────────────────────────────────────────────── */
.pe-related-topics {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-r-lg);
  padding: 18px 20px;
  margin-top: 16px;
  box-shadow: var(--pd-shadow-sm);
}
.pe-topics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.pe-topic-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--pd-bg);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-r);
  text-decoration: none;
  transition: all .14s;
}
.pe-topic-link:hover { background: #f0f5ff; border-color: #c5d3f5; text-decoration: none; }
.pe-topic-icon { font-size: 15px; flex-shrink: 0; }
.pe-topic-name {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--pd-navy);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color .12s;
}
.pe-topic-link:hover .pe-topic-name { color: var(--pd-blue); }
.pe-topic-count { display: block; font-size: 11px; color: var(--pd-ink4); }


/* ────────────────────────────────────────────────
   RELATED DOCUMENTS
──────────────────────────────────────────────── */
.pe-related-docs {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-r-lg);
  padding: 18px 20px;
  margin-top: 16px;
  box-shadow: var(--pd-shadow-sm);
}
.pe-docs-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--pd-border);
}
.pe-docs-count { font-size: 12px; color: var(--pd-ink4); margin-top: 2px; }
.pe-browse-all {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--pd-blue);
  text-decoration: none;
  white-space: nowrap;
  padding-top: 2px;
}
.pe-browse-all:hover { text-decoration: underline; }
.pe-doc-item {
  display: block;
  padding: 12px 4px;
  border-bottom: 1px solid var(--pd-border);
  text-decoration: none;
  border-radius: var(--pd-r);
  transition: background .12s;
}
.pe-doc-item:last-child { border-bottom: none; }
.pe-doc-item:hover { background: #fafbff; text-decoration: none; }
.pe-doc-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--pd-navy);
  line-height: 1.45;
  margin-bottom: 6px;
  transition: color .12s;
}
.pe-doc-item:hover .pe-doc-title { color: var(--pd-blue); }
.pe-doc-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 11px;
  color: var(--pd-ink4);
}
.pe-doc-badge { font-size: 10.5px; font-weight: 700; padding: 2px 7px; border-radius: 3px; }
.pe-doc-badge-type  { background: #eaeffa; color: var(--pd-blue); }
.pe-doc-badge-level { background: var(--pd-green-lt); color: var(--pd-green); }


/* ────────────────────────────────────────────────
   CITATION CARD
──────────────────────────────────────────────── */
.pe-citation {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-r-lg);
  padding: 18px 20px;
  margin-top: 16px;
  box-shadow: var(--pd-shadow-sm);
}
.pe-cit-tabs {
  display: flex;
  border-bottom: 1px solid var(--pd-border);
  margin-bottom: 12px;
}
.pe-cit-tab {
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  color: var(--pd-ink3);
  background: transparent;
  border: none;
  padding: 7px 14px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color .12s;
}
.pe-cit-tab.active { color: var(--pd-blue); border-bottom-color: var(--pd-blue); }
.pe-cit-text {
  font-family: 'Lora', Georgia, serif;
  font-size: 13px;
  line-height: 1.8;
  color: var(--pd-ink2);
  background: var(--pd-bg);
  border: 1px solid var(--pd-border);
  padding: 12px 14px;
  border-radius: var(--pd-r);
}
.pe-cit-note { margin-top: 10px; font-size: 11.5px; color: var(--pd-ink4); }


/* ────────────────────────────────────────────────
   SIDEBAR — paper example variant
──────────────────────────────────────────────── */
.pe-sb-card {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-radius: var(--pd-r-lg);
  padding: 18px;
  box-shadow: var(--pd-shadow-sm);
}
.pe-sb-card-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--pd-ink4);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--pd-border);
}
.pe-related-item {
  padding: 11px 0;
  border-bottom: 1px solid var(--pd-border);
}
.pe-related-item:last-child { border-bottom: none; padding-bottom: 0; }
.pe-related-title {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--pd-navy);
  line-height: 1.4;
  display: block;
  margin-bottom: 4px;
  text-decoration: none;
  transition: color .12s;
}
.pe-related-title:hover { color: var(--pd-orange); text-decoration: none; }
.pe-related-meta { font-size: 11px; color: var(--pd-ink4); }
.pe-tool-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--pd-border);
  text-decoration: none;
  color: var(--pd-ink2);
  font-size: 13px;
  font-weight: 500;
  transition: color .12s;
}
.pe-tool-item:last-child { border-bottom: none; }
.pe-tool-item:hover { color: var(--pd-orange); text-decoration: none; }
.pe-tool-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--pd-border2);
  flex-shrink: 0;
}

/* TextCheckr sidebar card */
.pe-sb-textcheckr {
  background: var(--pd-white);
  border: 1px solid var(--pd-border);
  border-top: 3px solid var(--pd-green);
  border-radius: var(--pd-r-lg);
  padding: 18px;
  box-shadow: var(--pd-shadow-sm);
}
.pe-sb-tc-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--pd-green);
  margin-bottom: 7px;
}
.pe-sb-tc-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--pd-ink);
  margin-bottom: 6px;
  line-height: 1.35;
}
.pe-sb-tc-body {
  font-size: 12.5px;
  color: var(--pd-ink3);
  line-height: 1.6;
  margin-bottom: 11px;
}
.pd-btn-tc {
  display: block;
  width: 100%;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--pd-green);
  background: var(--pd-green-lt);
  border: 1px solid #b3e8cc;
  padding: 9px;
  border-radius: var(--pd-r);
  cursor: pointer;
  transition: all .14s;
  text-align: center;
  text-decoration: none;
}
.pd-btn-tc:hover { background: #d1f5e4; border-color: var(--pd-green); text-decoration: none; }


/* ────────────────────────────────────────────────
   RESPONSIVE
──────────────────────────────────────────────── */
@media (max-width: 940px) {
  .pe-wrap { grid-template-columns: 1fr; }
  .pe-sidebar { display: none; }
}
@media (max-width: 640px) {
  .pe-essay-body { padding: 20px 18px 16px; font-size: 15px; line-height: 1.85; }
  .pe-gate { padding: 24px 18px 28px; }
  .pe-title { font-size: 19px; }
  .pe-gate-title { font-size: 19px; }
  .pe-wrap { padding: 16px 12px 60px; }
  .pe-topics-grid { grid-template-columns: 1fr; }
}