/*
  editorial-reading.css
  Loads AFTER styles.css + sv-home.css as a visual override for the reading view.
  Targets: .reader, .reader-body, .reader-nav, .page-section, .section-toolbar,
           .section-tabs-bar, .upgrade-gate, .topic-nav-bar, .topic-rating-bar,
           and all inline-injected JS style classes.
  Does NOT touch .sv-root / home island.
*/

/* ── Google Fonts (Space Grotesk + Hanken Grotesk) already loaded by sv-home.css ── */

/* ════════════════════════════════════════════════════════════════════
   BODY / WRAP — warm paper ground when in file view
   ════════════════════════════════════════════════════════════════════ */
body[data-sv-view="file"] {
  background: var(--paper) !important;
}

body[data-sv-view="file"] #app > .wrap {
  max-width: 1180px;
  padding: 0 clamp(16px, 4vw, 40px);
}

/* ════════════════════════════════════════════════════════════════════
   SECTION TABS BAR (sticky nav)
   ════════════════════════════════════════════════════════════════════ */
.section-tabs-bar {
  background: color-mix(in srgb, var(--paper) 90%, transparent) !important;
  backdrop-filter: blur(14px) saturate(1.2) !important;
  -webkit-backdrop-filter: blur(14px) saturate(1.2) !important;
  border-bottom: 1px solid var(--line) !important;
  border-radius: 0 !important;
}

.section-tab {
  font-family: var(--font-b) !important;
  font-size: 12px !important;
  font-weight: 600 !important;
  color: var(--ink-2) !important;
  border-bottom: 2.5px solid transparent !important;
  transition: color .15s, border-color .15s, background .15s !important;
}
.section-tab:hover {
  color: var(--ink) !important;
  background: var(--paper-2) !important;
}
.section-tab.active {
  color: var(--accent-ink) !important;
  border-bottom-color: var(--accent) !important;
  background: var(--accent-soft) !important;
}
.section-tab .tab-num {
  background: var(--line-2) !important;
  color: var(--ink-3) !important;
  border-radius: 6px !important;
}
.section-tab.active .tab-num {
  background: var(--accent) !important;
  color: #fff !important;
}
.section-tab.pg-done .tab-num {
  background: var(--accent) !important;
  color: #fff !important;
}
.section-tab.locked {
  opacity: .45 !important;
}
.section-tab.locked .tab-num {
  background: var(--line) !important;
  color: var(--ink-3) !important;
}

.section-tabs-meta {
  border-left: 1px solid var(--line) !important;
}
.section-tabs-meta .page-info {
  font-family: var(--font-b) !important;
  font-size: 11px !important;
  color: var(--ink-3) !important;
  font-weight: 700 !important;
  font-variant-numeric: tabular-nums !important;
}
.progress-badge {
  background: var(--accent-soft) !important;
  color: var(--accent-ink) !important;
  border-radius: 999px !important;
  font-family: var(--font-b) !important;
}
.pro-weekly-badge {
  background: var(--paper-2) !important;
  color: var(--ink-2) !important;
  border: 1px solid var(--line-2) !important;
  border-radius: 999px !important;
}
.deep-preview-badge {
  background: var(--accent-soft) !important;
  color: var(--accent-ink) !important;
  border-radius: 999px !important;
}

/* view mode toggle */
.view-mode-toggle {
  background: var(--paper-2) !important;
  border: 1px solid var(--line) !important;
  border-radius: 999px !important;
  padding: 3px !important;
}
.view-mode-btn {
  color: var(--ink-3) !important;
  border-radius: 999px !important;
}
.view-mode-btn:hover {
  color: var(--ink) !important;
  background: var(--card) !important;
}
.view-mode-btn.active {
  background: var(--card) !important;
  color: var(--accent-ink) !important;
  box-shadow: var(--shadow) !important;
}

/* ════════════════════════════════════════════════════════════════════
   READER LAYOUT
   ════════════════════════════════════════════════════════════════════ */
.reader {
  display: grid !important;
  grid-template-columns: 1fr 220px !important;
  gap: 32px !important;
  align-items: start !important;
}

.reader-nav {
  position: sticky !important;
  top: calc(var(--topbar-h, 56px) + 56px) !important;
  background: var(--card) !important;
  border: 1px solid var(--line) !important;
  border-radius: var(--r) !important;
  box-shadow: var(--shadow) !important;
  padding: 16px !important;
  max-height: calc(100vh - 140px) !important;
  overflow-y: auto !important;
}

/* ════════════════════════════════════════════════════════════════════
   PAGE SECTIONS — separator & done state
   ════════════════════════════════════════════════════════════════════ */
.page-section {
  padding-bottom: 12px !important;
  margin-bottom: 12px !important;
}
.page-section + .page-section {
  border-top: 1px solid var(--line) !important;
  padding-top: 36px !important;
}

.page-section.section-done {
  position: relative !important;
}
.page-section.section-done::before {
  content: '' !important;
  position: absolute !important;
  left: -20px !important;
  top: 0 !important;
  bottom: 0 !important;
  width: 3px !important;
  background: var(--accent) !important;
  border-radius: 3px !important;
}

/* ════════════════════════════════════════════════════════════════════
   ARTICLE TYPOGRAPHY — the editorial core
   ════════════════════════════════════════════════════════════════════ */
.reader-body {
  font-family: var(--font-b) !important;
  font-size: 16.5px !important;
  line-height: 1.72 !important;
  color: #2c2820 !important;
  -webkit-font-smoothing: antialiased !important;
  text-rendering: optimizeLegibility !important;
}

/* Headings — Space Grotesk, tight letter-spacing */
.reader-body h1 {
  font-family: var(--font-d) !important;
  font-size: clamp(26px, 4vw, 34px) !important;
  font-weight: 700 !important;
  letter-spacing: -.03em !important;
  line-height: 1.1 !important;
  color: var(--ink) !important;
  margin: 0 0 28px !important;
  padding-bottom: 18px !important;
  border-bottom: 1.5px solid var(--line) !important;
}

.reader-body h2 {
  font-family: var(--font-d) !important;
  font-size: clamp(20px, 2.8vw, 25px) !important;
  font-weight: 700 !important;
  letter-spacing: -.025em !important;
  line-height: 1.2 !important;
  color: var(--ink) !important;
  margin: 42px 0 14px !important;
  padding-bottom: 10px !important;
  border-bottom: 1px solid var(--line) !important;
}

.reader-body h3 {
  font-family: var(--font-d) !important;
  font-size: 18px !important;
  font-weight: 700 !important;
  letter-spacing: -.02em !important;
  line-height: 1.3 !important;
  color: var(--ink) !important;
  margin: 32px 0 10px !important;
}

.reader-body h4,
.reader-body h5,
.reader-body h6 {
  font-family: var(--font-d) !important;
  font-size: 15.5px !important;
  font-weight: 700 !important;
  letter-spacing: -.01em !important;
  color: var(--ink-2) !important;
  margin: 26px 0 8px !important;
}

/* Body text */
.reader-body p {
  font-size: 16.5px !important;
  line-height: 1.72 !important;
  color: #2c2820 !important;
  margin-bottom: 18px !important;
  max-width: 72ch !important;
  text-wrap: pretty !important;
}

.reader-body strong,
.reader-body b {
  color: var(--ink) !important;
  font-weight: 700 !important;
}

.reader-body em { font-style: italic !important; }

/* Links */
.reader-body a {
  color: var(--accent-ink) !important;
  text-decoration: none !important;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent) !important;
  font-weight: 500 !important;
  transition: color .15s, border-color .15s !important;
}
.reader-body a:hover {
  color: var(--accent) !important;
  border-bottom-color: var(--accent) !important;
}

/* Lists */
.reader-body ul,
.reader-body ol {
  font-size: 16.5px !important;
  line-height: 1.72 !important;
  color: #2c2820 !important;
  margin: 0 0 18px 22px !important;
}
.reader-body li {
  margin-bottom: 8px !important;
  padding-left: 4px !important;
}
.reader-body ul li::marker {
  color: var(--accent) !important;
}
.reader-body ol li::marker {
  font-family: var(--font-d) !important;
  font-weight: 700 !important;
  color: var(--accent-ink) !important;
}

/* Blockquote — warm editorial pull-quote */
.reader-body blockquote {
  border-left: 3.5px solid var(--accent) !important;
  background: var(--paper-2) !important;
  padding: 16px 22px !important;
  margin: 24px 0 !important;
  border-radius: 0 var(--r) var(--r) 0 !important;
  font-size: 15.5px !important;
  color: var(--ink-2) !important;
  font-style: italic !important;
}
.reader-body blockquote p {
  margin-bottom: 0 !important;
  font-size: 15.5px !important;
  color: var(--ink-2) !important;
}

/* Horizontal rule */
.reader-body hr {
  border: none !important;
  border-top: 1px solid var(--line) !important;
  margin: 36px 0 !important;
}

/* Images */
.reader-body img {
  max-width: 100% !important;
  border-radius: var(--r) !important;
  margin: 22px 0 !important;
  border: 1px solid var(--line) !important;
}

/* ════════════════════════════════════════════════════════════════════
   CODE — editorial card framing, keep hljs theme
   ════════════════════════════════════════════════════════════════════ */

/* Inline code */
.reader-body code {
  background: var(--paper-2) !important;
  color: var(--accent-ink) !important;
  border: 1px solid var(--line) !important;
  padding: 2px 7px !important;
  border-radius: 6px !important;
  font-size: .87em !important;
  font-weight: 500 !important;
}

/* Block code — editorial card */
.reader-body pre {
  background: #1e1c18 !important;
  border: 1px solid var(--line-2) !important;
  border-radius: var(--r) !important;
  padding: 22px 24px !important;
  margin: 22px 0 !important;
  overflow-x: auto !important;
  -webkit-overflow-scrolling: touch !important;
  box-shadow: 0 2px 8px rgba(40,34,20,.08) !important;
  position: relative !important;
}
.reader-body pre::before {
  content: '' !important;
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  height: 3px !important;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 40%, transparent)) !important;
  border-radius: var(--r) var(--r) 0 0 !important;
}
.reader-body pre code {
  background: transparent !important;
  color: #e8e4da !important;
  border: none !important;
  padding: 0 !important;
  font-size: 13.5px !important;
  line-height: 1.7 !important;
  font-weight: 400 !important;
}

/* ════════════════════════════════════════════════════════════════════
   TABLES — warm editorial
   ════════════════════════════════════════════════════════════════════ */
.reader-body .table-wrap {
  overflow-x: auto !important;
  -webkit-overflow-scrolling: touch !important;
  margin: 22px 0 !important;
  border-radius: var(--r) !important;
  border: 1px solid var(--line) !important;
  box-shadow: var(--shadow) !important;
}
.reader-body table {
  width: 100% !important;
  border-collapse: collapse !important;
  font-size: 14.5px !important;
  border-radius: var(--r) !important;
  overflow: hidden !important;
}
.reader-body th {
  background: var(--paper-2) !important;
  color: var(--ink) !important;
  font-family: var(--font-d) !important;
  font-weight: 700 !important;
  font-size: 12.5px !important;
  text-transform: uppercase !important;
  letter-spacing: .04em !important;
  text-align: left !important;
  padding: 11px 16px !important;
  border: none !important;
  border-bottom: 1.5px solid var(--line) !important;
}
.reader-body td {
  padding: 11px 16px !important;
  border: none !important;
  border-bottom: 1px solid var(--line) !important;
  color: #2c2820 !important;
  line-height: 1.55 !important;
}
.reader-body tr:last-child td {
  border-bottom: none !important;
}
.reader-body tr:nth-child(even) td {
  background: var(--paper-2) !important;
}

/* ════════════════════════════════════════════════════════════════════
   SECTION TOOLBAR — editorial pill controls
   ════════════════════════════════════════════════════════════════════ */
.section-toolbar {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  gap: 10px !important;
  padding: 14px 0 6px !important;
  margin-top: 28px !important;
  border-top: 1px solid var(--line) !important;
  flex-wrap: wrap !important;
}

/* Done button */
.section-done-btn {
  display: inline-flex !important;
  align-items: center !important;
  gap: 7px !important;
  padding: 7px 16px !important;
  border-radius: 999px !important;
  border: 1.5px solid var(--line-2) !important;
  background: var(--card) !important;
  color: var(--ink-2) !important;
  font-family: var(--font-b) !important;
  font-size: 12.5px !important;
  font-weight: 600 !important;
  cursor: pointer !important;
  transition: all .18s !important;
  user-select: none !important;
}
.section-done-btn:hover {
  border-color: var(--accent) !important;
  color: var(--accent-ink) !important;
  background: var(--accent-soft) !important;
}
.section-done-btn .done-icon {
  width: 18px !important;
  height: 18px !important;
  border-radius: 50% !important;
  border: 2px solid var(--line-2) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  font-size: 11px !important;
  transition: all .18s !important;
}
.section-done-btn.is-done {
  border-color: var(--accent) !important;
  background: var(--accent-soft) !important;
  color: var(--accent-ink) !important;
}
.section-done-btn.is-done .done-icon {
  background: var(--accent) !important;
  border-color: var(--accent) !important;
  color: #fff !important;
}

/* Note button */
.section-note-btn {
  display: inline-flex !important;
  align-items: center !important;
  gap: 6px !important;
  padding: 6px 13px !important;
  border-radius: 999px !important;
  border: 1.5px solid var(--line-2) !important;
  background: var(--card) !important;
  color: var(--ink-2) !important;
  font-family: var(--font-b) !important;
  font-size: 12.5px !important;
  font-weight: 600 !important;
  cursor: pointer !important;
  transition: all .18s !important;
}
.section-note-btn:hover {
  border-color: var(--accent) !important;
  color: var(--accent-ink) !important;
  background: var(--accent-soft) !important;
}
.section-note-btn.has-note {
  border-color: var(--accent) !important;
  color: var(--accent-ink) !important;
  background: var(--accent-soft) !important;
}

/* Note panel */
.section-note-panel {
  margin-top: 10px !important;
  border-radius: var(--r) !important;
  border: 1px solid var(--line) !important;
  background: var(--card) !important;
  box-shadow: var(--shadow) !important;
  overflow: hidden !important;
}
.section-note-area {
  width: 100% !important;
  min-height: 84px !important;
  max-height: 200px !important;
  padding: 13px 16px !important;
  border: none !important;
  outline: none !important;
  resize: vertical !important;
  font-size: 14px !important;
  font-family: var(--font-b) !important;
  color: #2c2820 !important;
  background: transparent !important;
  line-height: 1.65 !important;
}
.section-note-area::placeholder {
  color: var(--ink-3) !important;
  opacity: .7 !important;
}
.section-note-footer {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  padding: 7px 14px !important;
  border-top: 1px solid var(--line) !important;
  background: var(--paper-2) !important;
}
.section-note-footer span {
  font-size: 11px !important;
  color: var(--ink-3) !important;
  font-family: var(--font-b) !important;
}
.section-note-save {
  padding: 5px 14px !important;
  border-radius: 999px !important;
  border: none !important;
  background: var(--accent) !important;
  color: #fff !important;
  font-size: 11.5px !important;
  font-weight: 600 !important;
  font-family: var(--font-b) !important;
  cursor: pointer !important;
  transition: background .15s !important;
}
.section-note-save:hover {
  background: var(--accent-deep, oklch(0.42 0.07 172)) !important;
}

/* Stars */
.section-stars .star {
  font-size: 18px !important;
  color: var(--line-2) !important;
  transition: color .12s !important;
  cursor: pointer !important;
}
.section-stars .star.filled {
  color: #e8a000 !important;
}
.section-stars .star:hover,
.section-stars .star:hover ~ .star {
  color: #e8a000 !important;
}

/* Flag button */
.section-flag-btn {
  display: inline-flex !important;
  align-items: center !important;
  gap: 5px !important;
  padding: 5px 11px !important;
  border-radius: 999px !important;
  border: 1px solid var(--line) !important;
  background: transparent !important;
  color: var(--ink-3) !important;
  font-family: var(--font-b) !important;
  font-size: 11.5px !important;
  font-weight: 600 !important;
  cursor: pointer !important;
  transition: all .15s !important;
}
.section-flag-btn:hover {
  border-color: #c0392b !important;
  color: #c0392b !important;
}
.section-flag-btn.flagged {
  border-color: #c0392b !important;
  color: #c0392b !important;
  background: color-mix(in srgb, #c0392b 6%, transparent) !important;
}

/* ════════════════════════════════════════════════════════════════════
   TOPIC RATING BAR
   ════════════════════════════════════════════════════════════════════ */
.topic-rating-bar {
  display: flex !important;
  align-items: center !important;
  gap: 10px !important;
  padding: 12px 0 10px !important;
  margin-bottom: 6px !important;
  font-family: var(--font-b) !important;
  font-size: 13px !important;
  font-weight: 600 !important;
  color: var(--ink-3) !important;
  border-bottom: 1px solid var(--line) !important;
}
.topic-rating-bar .topic-stars .tstar {
  font-size: 22px !important;
  color: var(--line-2) !important;
  cursor: pointer !important;
  transition: color .12s !important;
}
.topic-rating-bar .topic-stars .tstar.filled {
  color: #e8a000 !important;
}
.topic-rating-bar .topic-stars .tstar:hover,
.topic-rating-bar .topic-stars .tstar:hover ~ .tstar {
  color: #e8a000 !important;
}

/* ════════════════════════════════════════════════════════════════════
   SKELETON LOADING STATES
   ════════════════════════════════════════════════════════════════════ */
.skeleton {
  background: linear-gradient(90deg, var(--paper-2) 25%, var(--line) 50%, var(--paper-2) 75%) !important;
  background-size: 300% 100% !important;
  animation: edSkeletonPulse 1.6s ease infinite !important;
  border-radius: 6px !important;
}
@keyframes edSkeletonPulse {
  0% { background-position: 100% 50%; }
  100% { background-position: -100% 50%; }
}

/* ════════════════════════════════════════════════════════════════════
   PAYWALL / UPGRADE GATE — editorial warm card
   ════════════════════════════════════════════════════════════════════ */
.upgrade-gate {
  background: var(--card) !important;
  border: 1px solid var(--line) !important;
  border-radius: var(--r) !important;
  padding: 44px 28px !important;
  text-align: center !important;
  margin: 32px 0 !important;
  box-shadow: var(--shadow) !important;
}
.upgrade-gate-inner {
  max-width: 440px !important;
  margin: 0 auto !important;
}
.lock-icon-lg {
  font-size: 38px !important;
  margin-bottom: 14px !important;
  display: block !important;
}
.upgrade-gate h3 {
  font-family: var(--font-d) !important;
  font-size: 22px !important;
  font-weight: 700 !important;
  letter-spacing: -.025em !important;
  color: var(--ink) !important;
  margin: 0 0 10px !important;
}
.upgrade-gate p {
  font-family: var(--font-b) !important;
  font-size: 15px !important;
  color: var(--ink-2) !important;
  margin: 0 0 22px !important;
  line-height: 1.55 !important;
}
.upgrade-options {
  display: flex !important;
  flex-direction: column !important;
  gap: 10px !important;
  margin-bottom: 16px !important;
}

/* Sign-in / Pro button — ink solid pill */
.btn-upgrade-pro {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 15px 22px !important;
  border-radius: var(--r) !important;
  border: none !important;
  cursor: pointer !important;
  font-family: var(--font-b) !important;
  font-weight: 700 !important;
  font-size: 15px !important;
  background: var(--ink) !important;
  color: var(--paper) !important;
  transition: background .15s, transform .12s !important;
  width: 100% !important;
}
.btn-upgrade-pro:hover {
  background: #000 !important;
  transform: translateY(-1px) !important;
}

/* Premium / Max button — accent teal */
.btn-upgrade-premium {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 15px 22px !important;
  border-radius: var(--r) !important;
  border: none !important;
  cursor: pointer !important;
  font-family: var(--font-b) !important;
  font-weight: 700 !important;
  font-size: 15px !important;
  background: var(--accent) !important;
  color: #fff !important;
  transition: background .15s, transform .12s !important;
  width: 100% !important;
}
.btn-upgrade-premium:hover {
  background: var(--accent-deep, oklch(0.42 0.07 172)) !important;
  transform: translateY(-1px) !important;
}

.upgrade-sub {
  font-family: var(--font-b) !important;
  font-size: 11.5px !important;
  font-weight: 400 !important;
  opacity: .82 !important;
  margin-top: 4px !important;
}

.upgrade-alt {
  font-family: var(--font-b) !important;
  font-size: 12.5px !important;
  color: var(--ink-3) !important;
  margin: 0 !important;
}
.upgrade-alt a {
  color: var(--accent-ink) !important;
  text-decoration: none !important;
  font-weight: 600 !important;
  cursor: pointer !important;
}
.upgrade-alt a:hover {
  color: var(--accent) !important;
}

/* Redeem credit button */
.btn-redeem-credit {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 15px 22px !important;
  border-radius: var(--r) !important;
  border: none !important;
  background: var(--accent) !important;
  color: #fff !important;
  font-family: var(--font-b) !important;
  font-weight: 700 !important;
  font-size: 15px !important;
  cursor: pointer !important;
  transition: background .15s, transform .12s !important;
  width: 100% !important;
}
.btn-redeem-credit:hover {
  background: var(--accent-deep, oklch(0.42 0.07 172)) !important;
  transform: translateY(-1px) !important;
  box-shadow: 0 6px 20px color-mix(in srgb, var(--accent) 35%, transparent) !important;
}

/* Deep preview button — editorial dashed teal */
.btn-deep-preview {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 14px 20px !important;
  border-radius: var(--r) !important;
  border: 2px dashed var(--accent) !important;
  background: var(--accent-soft) !important;
  color: var(--accent-ink) !important;
  font-family: var(--font-b) !important;
  font-weight: 700 !important;
  font-size: 14.5px !important;
  cursor: pointer !important;
  transition: all .18s !important;
  width: 100% !important;
}
.btn-deep-preview:hover {
  background: var(--accent) !important;
  color: #fff !important;
  border-style: solid !important;
  transform: translateY(-1px) !important;
}
.btn-deep-preview .dp-sub {
  font-size: 11.5px !important;
  font-weight: 400 !important;
  opacity: .82 !important;
  margin-top: 4px !important;
}

/* ════════════════════════════════════════════════════════════════════
   PREV / NEXT TOPIC NAV
   ════════════════════════════════════════════════════════════════════ */
.topic-nav-bar {
  display: grid !important;
  grid-template-columns: 1fr 1fr !important;
  gap: 14px !important;
  margin: 48px 0 24px !important;
  padding-top: 28px !important;
  border-top: 1px solid var(--line) !important;
}
.topic-nav-card {
  display: flex !important;
  flex-direction: column !important;
  gap: 6px !important;
  padding: 18px 20px !important;
  border-radius: var(--r) !important;
  border: 1px solid var(--line) !important;
  background: var(--card) !important;
  cursor: pointer !important;
  transition: border-color .18s, transform .14s, box-shadow .18s !important;
  min-height: 76px !important;
  justify-content: center !important;
  box-shadow: var(--shadow) !important;
}
.topic-nav-card:hover {
  border-color: var(--accent) !important;
  background: var(--accent-soft) !important;
  box-shadow: var(--shadow-lg) !important;
  transform: translateY(-2px) !important;
}
.topic-nav-label {
  display: flex !important;
  align-items: center !important;
  gap: 6px !important;
  font-family: var(--font-b) !important;
  font-size: 11px !important;
  font-weight: 700 !important;
  text-transform: uppercase !important;
  letter-spacing: .07em !important;
  color: var(--ink-3) !important;
}
.topic-nav-card.nav-next .topic-nav-label {
  justify-content: flex-end !important;
}
.topic-nav-arrow {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 22px !important;
  height: 22px !important;
  border-radius: 7px !important;
  background: var(--accent) !important;
  color: #fff !important;
  font-size: 13px !important;
  font-weight: 700 !important;
  flex-shrink: 0 !important;
  transition: transform .18s !important;
}
.topic-nav-card:hover .topic-nav-arrow {
  transform: scale(1.1) !important;
}
.topic-nav-card.nav-prev:hover .topic-nav-arrow {
  transform: translateX(-2px) scale(1.1) !important;
}
.topic-nav-card.nav-next:hover .topic-nav-arrow {
  transform: translateX(2px) scale(1.1) !important;
}
.topic-nav-title {
  font-family: var(--font-d) !important;
  font-size: 14px !important;
  font-weight: 700 !important;
  letter-spacing: -.01em !important;
  color: var(--ink) !important;
  line-height: 1.35 !important;
}
.topic-nav-meta {
  font-family: var(--font-b) !important;
  font-size: 11px !important;
  color: var(--ink-3) !important;
  font-weight: 500 !important;
}

/* ════════════════════════════════════════════════════════════════════
   FLOATING SECTION SCROLL BUTTONS
   ════════════════════════════════════════════════════════════════════ */
.section-scroll-btn {
  width: 44px !important;
  height: 44px !important;
  border-radius: 50% !important;
  border: 1px solid var(--line-2) !important;
  background: var(--card) !important;
  box-shadow: var(--shadow) !important;
  color: var(--ink-2) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  cursor: pointer !important;
  transition: all .18s !important;
}
.section-scroll-btn:hover {
  border-color: var(--accent) !important;
  color: var(--accent-ink) !important;
  box-shadow: 0 6px 20px color-mix(in srgb, var(--accent) 25%, transparent) !important;
  transform: translateY(-1px) !important;
}
.section-scroll-counter {
  background: var(--accent) !important;
  color: #fff !important;
  font-family: var(--font-b) !important;
  font-weight: 700 !important;
  font-size: 10px !important;
  border-radius: 10px !important;
}

/* ════════════════════════════════════════════════════════════════════
   TOPIC META CARD
   ════════════════════════════════════════════════════════════════════ */
.topic-meta-card {
  background: var(--card) !important;
  border: 1px solid var(--line) !important;
  border-radius: var(--r) !important;
  padding: 20px 24px !important;
  margin-bottom: 28px !important;
  box-shadow: var(--shadow) !important;
}
.topic-meta-label {
  font-family: var(--font-b) !important;
  font-size: 11px !important;
  font-weight: 700 !important;
  text-transform: uppercase !important;
  letter-spacing: .07em !important;
  color: var(--ink-3) !important;
}
.topic-meta-value {
  font-family: var(--font-b) !important;
  font-size: 13.5px !important;
  color: #2c2820 !important;
  line-height: 1.5 !important;
}
.topic-meta-value a {
  color: var(--accent-ink) !important;
  text-decoration: none !important;
}
.topic-meta-subject {
  font-family: var(--font-b) !important;
  font-size: 13.5px !important;
  font-weight: 600 !important;
  color: var(--accent-ink) !important;
}
.topic-meta-tag {
  background: var(--paper-2) !important;
  color: var(--ink-2) !important;
  border: 1px solid var(--line) !important;
  border-radius: 999px !important;
  font-family: var(--font-b) !important;
  font-size: 11.5px !important;
  font-weight: 600 !important;
}
.topic-meta-level.level-beginner {
  background: var(--accent-soft) !important;
  color: var(--accent-ink) !important;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent) !important;
}
.topic-meta-level.level-intermediate {
  background: #fef9ec !important;
  color: #946000 !important;
  border: 1px solid #f5d87a !important;
}
.topic-meta-level.level-advanced {
  background: #fdf0f4 !important;
  color: #9b2240 !important;
  border: 1px solid #f0b8cb !important;
}
.topic-meta-prereq {
  background: var(--paper-2) !important;
  color: var(--ink-2) !important;
  border: 1px solid var(--line) !important;
  border-radius: 6px !important;
  font-family: var(--font-b) !important;
}

/* ════════════════════════════════════════════════════════════════════
   MERMAID DIAGRAMS
   ════════════════════════════════════════════════════════════════════ */
.reader-body .mermaid {
  background: var(--card) !important;
  border: 1px solid var(--line) !important;
  border-radius: var(--r) !important;
  padding: 20px !important;
  margin: 22px 0 !important;
  overflow-x: auto !important;
  box-shadow: var(--shadow) !important;
}

/* ════════════════════════════════════════════════════════════════════
   AD SLOTS — unobtrusive in editorial context
   ════════════════════════════════════════════════════════════════════ */
.ad-slot {
  border-radius: var(--r) !important;
  background: var(--paper-2) !important;
  border: 1px solid var(--line) !important;
  overflow: hidden !important;
}
.ad-slot-inline {
  margin: 28px 0 !important;
}

/* ════════════════════════════════════════════════════════════════════
   RESPONSIVE
   ════════════════════════════════════════════════════════════════════ */
@media (max-width: 860px) {
  .reader {
    grid-template-columns: 1fr !important;
  }
  .reader-nav {
    display: none !important;
  }
}

@media (max-width: 600px) {
  .reader-body p,
  .reader-body ul,
  .reader-body ol {
    font-size: 15.5px !important;
  }
  .reader-body h1 { font-size: 24px !important; }
  .reader-body h2 { font-size: 19px !important; }
  .reader-body h3 { font-size: 16.5px !important; }
  .reader-body pre { padding: 16px 14px !important; }
  .reader-body pre code { font-size: 12.5px !important; }
  .upgrade-gate { padding: 28px 18px !important; margin: 20px 0 !important; }
  .upgrade-gate h3 { font-size: 19px !important; }
  .upgrade-gate p { font-size: 13.5px !important; }
  .topic-nav-bar { grid-template-columns: 1fr !important; gap: 10px !important; }
  .topic-nav-card.nav-next { text-align: left !important; }
  .topic-nav-card.nav-next .topic-nav-label { justify-content: flex-start !important; }
  .page-section.section-done::before { left: -12px !important; }
}

@media (prefers-reduced-motion: reduce) {
  .skeleton { animation: none !important; background: var(--paper-2) !important; }
}