:root {
  --bg-page: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-elevated: #F1F5F9;
  --bg-code: #0F172A;
  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-muted: #64748B;
  --border-subtle: #E2E8F0;
  --border-strong: #CBD5E1;
  --accent-primary: #1D4ED8;
  --accent-primary-hover: #1E40AF;
  --accent-secondary: #0284C7;
  --accent-bg-soft: #EFF6FF;
  --teal-bg-soft: #E0F2FE;
  --amber-bg-soft: #FEF3C7;
  --amber-text: #92400E;
  --green-bg-soft: #DCFCE7;
  --green-text: #166534;
  --font-serif: 'Source Serif 4', Georgia, Cambria, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.09);
  --radius-sm: 6px;
  --radius-md: 10px;
}

[data-theme="dark"] {
  --bg-page: #0B1120;
  --bg-surface: #111827;
  --bg-elevated: #1E293B;
  --bg-code: #070B14;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --border-subtle: #1E293B;
  --border-strong: #334155;
  --accent-primary: #3B82F6;
  --accent-primary-hover: #60A5FA;
  --accent-secondary: #38BDF8;
  --accent-bg-soft: rgba(59, 130, 246, 0.16);
  --teal-bg-soft: rgba(56, 189, 248, 0.15);
  --amber-bg-soft: rgba(245, 158, 11, 0.16);
  --amber-text: #FBBF24;
  --green-bg-soft: rgba(34, 197, 94, 0.16);
  --green-text: #4ADE80;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body.sf-body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main.sf-main {
  flex: 1 0 auto;
  width: 100%;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

a:hover {
  color: var(--accent-primary-hover);
}

img, svg, video, canvas {
  max-width: 100%;
  height: auto;
}

.sf-container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding-left: clamp(1rem, 3vw, 2rem);
  padding-right: clamp(1rem, 3vw, 2rem);
}

.sf-skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 3000;
  background: var(--accent-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
}

.sf-skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.sf-divider-dot {
  margin: 0 0.4rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Header, Masthead & Responsive Navigation
   ========================================================================== */
.sf-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}

.sf-masthead {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.85rem 0;
}

.sf-masthead-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1rem, 1.8vw, 1.5rem);
  position: relative;
}

.sf-brand {
  flex-shrink: 0;
  min-width: 0;
}

.sf-logo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
}

.sf-brand-text {
  min-width: 0;
}

.sf-crest {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #fff;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  letter-spacing: 0.04em;
  box-shadow: 0 2px 6px rgba(29, 78, 216, 0.25);
}

.sf-site-title {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 1.6vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--text-primary);
  white-space: nowrap;
}

.sf-site-subtitle {
  display: block;
  font-size: 0.73rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sf-nav-menu-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 1 1 auto;
  gap: clamp(0.85rem, 1.5vw, 1.5rem);
  min-width: 0;
  margin-right: 0.35rem;
}

.sf-nav {
  margin: 0 auto;
  min-width: 0;
  flex-shrink: 1;
}

.sf-nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: clamp(0.65rem, 1.25vw, 1.3rem);
  margin: 0;
  padding: 0;
}

.sf-nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.sf-nav-link:hover,
.sf-nav-link.is-active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

.sf-header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-shrink: 0;
}

.sf-auth-widget {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

#auth-btn-label {
  display: inline-block;
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sf-header-controls {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  padding-left: 0.85rem;
  border-left: 1px solid var(--border-subtle);
}

.sf-search-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.42rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  font-family: var(--font-sans);
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  height: 36px;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.sf-search-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.sf-kbd {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--bg-surface);
  padding: 0.06rem 0.32rem;
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  color: var(--text-muted);
}

/* Header Dark/Light Theme Button */
.sf-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.38rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.4rem 0.7rem;
  height: 36px;
  cursor: pointer;
  font-family: var(--font-sans);
  white-space: nowrap;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.sf-theme-toggle:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-bg-soft);
}

.sf-theme-icon-light,
.sf-theme-icon-dark {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

[data-theme="light"] .sf-theme-icon-light { display: none; }
[data-theme="dark"] .sf-theme-icon-dark { display: none; }

/* Mobile Hamburger Toggle */
.sf-mobile-toggle {
  display: none;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.45rem;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.sf-mobile-toggle:hover {
  border-color: var(--accent-primary);
}

.sf-hamburger-bar {
  display: block;
  width: 18px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.sf-mobile-toggle.is-active .sf-hamburger-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.sf-mobile-toggle.is-active .sf-hamburger-bar:nth-child(2) {
  opacity: 0;
}
.sf-mobile-toggle.is-active .sf-hamburger-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Discipline Ribbon */
.sf-discipline-ribbon {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.45rem 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.sf-discipline-ribbon::-webkit-scrollbar {
  height: 3px;
}

.sf-discipline-ribbon::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 999px;
}

.sf-discipline-ribbon-inner {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  white-space: nowrap;
}

.sf-ribbon-label {
  font-size: 0.73rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  flex-shrink: 0;
}

.sf-ribbon-links {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.sf-ribbon-chip {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.sf-ribbon-chip:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-bg-soft);
}

/* ==========================================================================
   Buttons, Badges & Pills
   ========================================================================== */
.sf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.58rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.sf-btn-sm {
  font-size: 0.82rem;
  padding: 0.4rem 0.78rem;
  height: 36px;
}

.sf-btn-block {
  width: 100%;
  margin-bottom: 0.5rem;
}

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

.sf-btn-primary:hover {
  background: var(--accent-primary-hover);
  color: #fff;
}

.sf-btn-outline {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.sf-btn-outline:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-bg-soft);
}

.sf-btn-ghost {
  background: var(--bg-elevated);
  color: var(--text-secondary);
}

.sf-btn-ghost:hover {
  color: var(--accent-primary);
  background: var(--accent-bg-soft);
}

.sf-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  letter-spacing: 0.05em;
  background: var(--accent-bg-soft);
  color: var(--accent-primary);
}

.sf-badge-accent {
  background: var(--accent-primary);
  color: #fff;
}

.sf-eyebrow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 0.85rem;
}

.sf-eyebrow-sm {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-primary);
}

.sf-meta-text {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

.sf-link-arrow {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-primary);
  white-space: nowrap;
}

.sf-link-arrow:hover {
  color: var(--accent-primary-hover);
  text-decoration: underline;
}

.sf-discipline-tag {
  display: inline-block;
  font-size: 0.73rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  background: var(--teal-bg-soft);
  color: var(--accent-secondary);
}

.sf-category-tag,
.sf-category-chip {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  background: var(--accent-bg-soft);
  color: var(--accent-primary);
}

.sf-label-chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 0.18rem 0.5rem;
  border-radius: 4px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.sf-label-chip:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.sf-paywall-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.73rem;
  font-weight: 600;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  background: var(--amber-bg-soft);
  color: var(--amber-text);
}

.sf-open-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.73rem;
  font-weight: 600;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  background: var(--green-bg-soft);
  color: var(--green-text);
}

.sf-difficulty-pill {
  font-size: 0.74rem;
  padding: 0.12rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

/* ==========================================================================
   Home Hero & Sections
   ========================================================================== */
.sf-hero {
  padding: clamp(1.75rem, 4vw, 2.75rem) 0 clamp(1.5rem, 3.5vw, 2.25rem);
  border-bottom: 1px solid var(--border-subtle);
}

.sf-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: stretch;
}

.sf-hero-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.sf-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 3.5vw, 2.35rem);
  line-height: 1.22;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.sf-hero-lead {
  font-size: clamp(0.95rem, 1.2vw, 1.05rem);
  color: var(--text-secondary);
  margin: 0 0 1.5rem;
}

.sf-hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.sf-featured-card {
  min-width: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-top: 4px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: clamp(1.2rem, 2.5vw, 1.6rem);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.sf-card-meta-top {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin-bottom: 0.75rem;
}

.sf-featured-title {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2vw, 1.45rem);
  line-height: 1.3;
  margin: 0 0 0.75rem;
}

.sf-featured-title a {
  color: var(--text-primary);
}

.sf-featured-title a:hover {
  color: var(--accent-primary);
}

.sf-featured-abstract {
  color: var(--text-secondary);
  font-size: 0.93rem;
  margin: 0 0 1.25rem;
}

.sf-card-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
}

.sf-author-byline {
  font-weight: 600;
  color: var(--text-secondary);
}

/* ==========================================================================
   Disciplines Grid & Dual Feed
   ========================================================================== */
.sf-section {
  padding: clamp(1.75rem, 3.5vw, 2.5rem) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.sf-section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-bottom: 1.35rem;
  gap: 0.75rem 1rem;
}

.sf-section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.2vw, 1.6rem);
  margin: 0;
}

.sf-section-subtitle {
  color: var(--text-secondary);
  margin: 0.25rem 0 0;
  font-size: 0.92rem;
}

.sf-discipline-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.sf-discipline-card {
  min-width: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.sf-discipline-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.sf-discipline-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.sf-discipline-card h3 {
  font-family: var(--font-serif);
  margin: 0 0 0.5rem;
  font-size: 1.18rem;
  color: var(--text-primary);
}

.sf-discipline-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin: 0 0 0.9rem;
  flex: 1 0 auto;
}

.sf-discipline-explore {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-primary);
}

/* Dual Feed & Cards */
.sf-dual-feed {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.sf-feed-col {
  min-width: 0;
}

.sf-card {
  min-width: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: clamp(1.1rem, 2vw, 1.35rem);
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.sf-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.sf-card-title {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 1.6vw, 1.25rem);
  margin: 0 0 0.5rem;
  line-height: 1.32;
}

.sf-card-title a {
  color: var(--text-primary);
}

.sf-card-title a:hover {
  color: var(--accent-primary);
}

.sf-card-excerpt {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin: 0 0 1rem;
}

.sf-card-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.sf-card-meta-info {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
}

.sf-card-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.sf-label-mini {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-secondary);
}

.sf-label-mini:hover {
  color: var(--accent-primary);
}

.sf-note-card {
  min-width: 0;
  background: var(--bg-surface);
  border-left: 3px solid var(--accent-primary);
  border-top: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1rem 1.15rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 0.85rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.sf-note-card:hover {
  box-shadow: var(--shadow-sm);
}

.sf-note-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.4rem;
}

.sf-note-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
}

.sf-note-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  margin: 0 0 0.35rem;
  line-height: 1.35;
}

.sf-note-title a {
  color: var(--text-primary);
}

.sf-note-title a:hover {
  color: var(--accent-primary);
}

.sf-note-summary {
  font-size: 0.86rem;
  color: var(--text-secondary);
  margin: 0 0 0.55rem;
}

.sf-note-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.76rem;
  color: var(--text-muted);
}

.sf-note-labels {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.sf-taxonomy-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1.5rem;
}

.sf-taxonomy-box-title {
  font-family: var(--font-serif);
  margin: 0 0 0.85rem;
  font-size: 1.1rem;
}

.sf-taxonomy-group {
  margin-bottom: 0.85rem;
}

.sf-taxonomy-group:last-child {
  margin-bottom: 0;
}

.sf-taxonomy-group-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.sf-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* ==========================================================================
   Single Article Page Layout (Responsive 3-Column Scholarly Grid)
   ========================================================================== */
.sf-reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent-primary);
  width: 0%;
  z-index: 1100;
  transition: width 0.1s linear;
}

.sf-article-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: clamp(1.5rem, 3.5vw, 2.25rem) 0 clamp(1.25rem, 3vw, 2rem);
}

.sf-breadcrumbs {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.45rem;
}

.sf-article-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin-bottom: 0.9rem;
}

.sf-content-type-badge {
  font-size: 0.73rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-primary);
}

.sf-article-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 1.22;
  margin: 0 0 0.75rem;
  max-width: 920px;
  overflow-wrap: break-word;
}

.sf-article-subtitle {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--text-secondary);
  margin: 0 0 1.25rem;
  max-width: 820px;
}

.sf-article-byline-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.sf-byline-primary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.sf-byline-metrics {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
}

.sf-doi-code,
.sf-mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  word-break: break-all;
}

/* 3-Column Grid that fits strictly inside 1320px container */
.sf-article-grid {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr) 235px;
  gap: clamp(1.5rem, 2.5vw, 2.25rem);
  padding-top: clamp(1.5rem, 3vw, 2.25rem);
  padding-bottom: clamp(2.5rem, 5vw, 4rem);
  align-items: start;
}

.sf-sidebar-left,
.sf-article-main,
.sf-sidebar-right {
  min-width: 0;
}

/* Left Metadata Sidebar */
.sf-meta-panel {
  position: sticky;
  top: 5.5rem;
}

.sf-meta-section {
  padding-bottom: 1.1rem;
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.sf-meta-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.sf-meta-section h4 {
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0 0 0.6rem;
}

.sf-meta-dl {
  display: grid;
  grid-template-columns: 65px minmax(0, 1fr);
  row-gap: 0.35rem;
  column-gap: 0.5rem;
  font-size: 0.82rem;
  margin: 0;
}

.sf-meta-dl dt {
  color: var(--text-muted);
}

.sf-meta-dl dd {
  margin: 0;
  font-weight: 500;
  overflow-wrap: break-word;
}

.sf-sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

/* Center Scholarly Prose & Abstract */
.sf-abstract-box {
  background: var(--bg-elevated);
  border-left: 4px solid var(--accent-primary);
  padding: clamp(1.1rem, 2vw, 1.35rem) clamp(1.15rem, 2.5vw, 1.5rem);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 1.75rem;
}

.sf-abstract-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-primary);
  margin-bottom: 0.45rem;
}

.sf-abstract-box p {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  margin: 0;
  color: var(--text-primary);
}

.sf-takeaways {
  margin-top: 0.9rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.9rem;
}

.sf-takeaways ul {
  margin: 0.35rem 0 0;
  padding-left: 1.2rem;
}

.sf-prose {
  font-family: var(--font-serif);
  font-size: clamp(1.02rem, 1.2vw, 1.125rem);
  line-height: 1.76;
  color: var(--text-primary);
  min-width: 0;
  overflow-wrap: break-word;
  word-wrap: break-word;
}

.sf-prose h2,
.sf-prose h3,
.sf-prose h4 {
  font-family: var(--font-serif);
  color: var(--text-primary);
  line-height: 1.3;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  scroll-margin-top: 5.5rem;
}

.sf-prose h2 {
  font-size: clamp(1.3rem, 2.2vw, 1.6rem);
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border-subtle);
}

.sf-prose h3 {
  font-size: clamp(1.15rem, 1.8vw, 1.3rem);
}

.sf-prose p,
.sf-prose ul,
.sf-prose ol {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.sf-prose code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-elevated);
  padding: 0.15rem 0.38rem;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  word-break: break-word;
}

.sf-prose pre {
  position: relative;
  background: var(--bg-code);
  color: #E6EDF3;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.55;
  margin: 1.5rem 0;
}

.sf-prose pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
  word-break: normal;
}

.sf-code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #1E293B;
  color: #94A3B8;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  border-bottom: 1px solid #334155;
}

.sf-code-header + pre {
  margin-top: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.sf-copy-code-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #F1F5F9;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
  cursor: pointer;
}

.sf-copy-code-btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.sf-prose table {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-family: var(--font-sans);
  font-size: 0.88rem;
}

.sf-prose th,
.sf-prose td {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-subtle);
  text-align: left;
}

.sf-prose th {
  background: var(--bg-elevated);
  font-weight: 600;
  white-space: nowrap;
}

.sf-prose img,
.sf-prose figure {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem auto;
  border-radius: var(--radius-sm);
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  padding: 0.5rem 0;
  -webkit-overflow-scrolling: touch;
}

/* Custom Forensic Shortcodes */
.sf-callout {
  font-family: var(--font-sans);
  font-size: 0.93rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent-secondary);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
}

.sf-callout-warning { border-left-color: #D97706; }
.sf-callout-legal { border-left-color: var(--accent-primary); }

.sf-callout-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.sf-callout-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  background: var(--accent-bg-soft);
  color: var(--accent-primary);
}

.sf-evidence-box {
  font-family: var(--font-sans);
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  margin: 1.5rem 0;
}

.sf-evidence-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--accent-primary);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.45rem;
  margin-bottom: 0.75rem;
}

.sf-evidence-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.55rem;
  font-size: 0.85rem;
  margin-bottom: 0.65rem;
}

.sf-protocol-box {
  font-family: var(--font-sans);
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  margin: 1.5rem 0;
}

.sf-protocol-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}

.sf-protocol-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--accent-primary);
  color: #fff;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.sf-protocol-title {
  margin: 0 !important;
  font-size: 1.02rem !important;
}

.sf-case-ref {
  font-family: var(--font-sans);
  background: var(--bg-surface);
  border-left: 4px solid var(--accent-primary);
  margin: 1.5rem 0;
  padding: 1rem 1.2rem;
  font-size: 0.92rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.sf-case-ref-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.4rem;
}

/* Article Footer & Adjacent Post Navigation */
.sf-article-footer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.sf-article-footer-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.sf-post-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.sf-post-nav-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.15rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.sf-post-nav-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

.sf-post-nav-next {
  text-align: right;
}

.sf-post-nav-dir {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent-primary);
}

/* Sticky Right Table of Contents & Mobile ToC */
.sf-toc-card {
  position: sticky;
  top: 5.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  max-height: calc(100vh - 7rem);
  overflow-y: auto;
}

.sf-toc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--border-subtle);
}

.sf-toc-progress-pct {
  color: var(--accent-primary);
  font-family: var(--font-mono);
}

.sf-toc-nav ul,
.sf-toc-mobile-body ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.sf-toc-nav ul ul,
.sf-toc-mobile-body ul ul {
  padding-left: 0.85rem;
  border-left: 1px solid var(--border-subtle);
  margin-top: 0.25rem;
}

.sf-toc-nav li,
.sf-toc-mobile-body li {
  margin-bottom: 0.35rem;
}

.sf-toc-nav a,
.sf-toc-mobile-body a {
  display: block;
  font-size: 0.82rem;
  line-height: 1.35;
  color: var(--text-secondary);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
}

.sf-toc-nav a:hover,
.sf-toc-nav a.is-active,
.sf-toc-mobile-body a:hover {
  color: var(--accent-primary);
  background: var(--accent-bg-soft);
  font-weight: 600;
}

.sf-toc-mobile {
  display: none;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.1rem;
  margin-bottom: 1.5rem;
}

.sf-toc-mobile summary {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  cursor: pointer;
}

.sf-toc-mobile-body {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
}

/* ==========================================================================
   Individual Post Paywall Gate UI
   ========================================================================== */
.sf-paywall-gate {
  position: relative;
  margin-top: -3rem;
  padding-top: 3rem;
}

.sf-paywall-fade {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3.5rem;
  background: linear-gradient(to bottom, transparent, var(--bg-page));
  pointer-events: none;
}

.sf-paywall-box {
  background: var(--bg-surface);
  border: 2px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: clamp(1.25rem, 3vw, 2rem);
  text-align: center;
  box-shadow: var(--shadow-md);
}

.sf-paywall-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.sf-paywall-kicker {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-primary);
  margin-bottom: 0.4rem;
}

.sf-paywall-box h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.5vw, 1.55rem);
  margin: 0 0 0.65rem;
}

.sf-paywall-box p {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 1.25rem;
  font-size: 0.94rem;
}

.sf-paywall-highlights {
  display: flex;
  justify-content: center;
  gap: 0.85rem;
  margin-bottom: 1.35rem;
  flex-wrap: wrap;
}

.sf-paywall-stat {
  background: var(--bg-elevated);
  padding: 0.55rem 0.95rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  flex: 1 1 130px;
  max-width: 190px;
}

.sf-paywall-stat strong {
  display: block;
  color: var(--text-primary);
}

.sf-paywall-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.sf-paywall-footnote {
  font-size: 0.76rem !important;
  color: var(--text-muted) !important;
  margin-top: 1rem !important;
  margin-bottom: 0 !important;
}

/* ==========================================================================
   Modals (Search, Auth, Citation)
   ========================================================================== */
.sf-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 17, 32, 0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(1rem, 5vh, 4rem) 1rem;
  z-index: 2000;
  overflow-y: auto;
}

.sf-modal-backdrop[hidden] {
  display: none !important;
}

.sf-modal {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  width: 100%;
  max-width: 540px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin: auto 0;
}

.sf-search-modal {
  max-width: 680px;
}

.sf-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.15rem 1.35rem;
  border-bottom: 1px solid var(--border-subtle);
}

.sf-modal-header h3 {
  font-family: var(--font-serif);
  margin: 0.15rem 0 0;
  font-size: 1.25rem;
}

.sf-modal-close {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  flex-shrink: 0;
}

.sf-modal-close:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.sf-auth-body,
.sf-modal-body {
  padding: 1.35rem;
}

.sf-auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.sf-auth-tab {
  padding: 0.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.sf-auth-tab.is-active {
  background: var(--accent-bg-soft);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.sf-auth-alert {
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  font-size: 0.84rem;
  margin-bottom: 1rem;
}

.sf-form-group {
  margin-bottom: 1rem;
}

.sf-form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.sf-input {
  width: 100%;
  padding: 0.58rem 0.75rem;
  background: var(--bg-page);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.92rem;
  font-family: var(--font-sans);
}

.sf-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-bg-soft);
}

.sf-auth-divider {
  text-align: center;
  margin: 0.9rem 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sf-auth-demo-box {
  margin-top: 1.15rem;
  padding: 0.9rem;
  background: var(--bg-elevated);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
}

.sf-auth-demo-box p {
  margin: 0.35rem 0 0.65rem;
  color: var(--text-secondary);
}

.sf-auth-demo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.sf-auth-demo-actions .sf-btn {
  flex: 1 1 160px;
}

.sf-user-profile-card {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
}

.sf-user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-primary);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sf-user-email {
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 0.25rem;
  word-break: break-all;
}

.sf-auth-status-note {
  font-size: 0.86rem;
  color: var(--text-secondary);
  margin: 0 0 1.25rem;
}

.sf-search-input-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1.15rem;
  border-bottom: 1px solid var(--border-subtle);
}

.sf-search-input {
  flex: 1;
  min-width: 0;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.98rem;
  font-family: var(--font-sans);
  outline: none;
}

.sf-search-results {
  max-height: 60vh;
  overflow-y: auto;
  padding: 0.75rem 1.15rem;
}

.sf-search-empty {
  padding: 1.5rem 0.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.sf-search-hit {
  display: block;
  padding: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.sf-search-hit:hover {
  background: var(--bg-elevated);
}

/* ==========================================================================
   Archive & Terms Pages
   ========================================================================== */
.sf-archive-header {
  padding: clamp(1.5rem, 3.5vw, 2.25rem) 0 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.75rem;
}

.sf-archive-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  margin: 0 0 0.5rem;
}

.sf-archive-desc {
  max-width: 780px;
  color: var(--text-secondary);
}

.sf-filter-bar {
  margin-top: 1.15rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.sf-filter-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.sf-filter-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-right: 0.25rem;
}

.sf-filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.sf-filter-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.sf-filter-btn.is-active {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}

.sf-archive-grid,
.sf-terms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 310px), 1fr));
  gap: 1.25rem;
  padding-bottom: 3rem;
}

.sf-archive-item {
  min-width: 0;
  display: flex;
}

.sf-archive-item > .sf-card,
.sf-archive-item > .sf-note-card {
  width: 100%;
  margin-bottom: 0;
}

.sf-cite-block {
  margin-bottom: 1rem;
}

.sf-cite-block:last-child {
  margin-bottom: 0;
}

.sf-cite-block label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.sf-cite-pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
  margin: 0;
  color: var(--text-primary);
}

.sf-term-card {
  min-width: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.sf-term-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.sf-term-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.sf-term-name {
  font-family: var(--font-serif);
  font-size: 1.18rem;
  margin: 0;
  color: var(--text-primary);
}

.sf-term-count {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-bg-soft);
  color: var(--accent-primary);
  white-space: nowrap;
}

.sf-term-preview {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.sf-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: clamp(2rem, 4vw, 3rem) 0 1.75rem;
  margin-top: 3rem;
  font-size: 0.88rem;
}

.sf-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.sf-footer-col {
  min-width: 0;
}

.sf-footer-col h4 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin: 0 0 0.75rem;
}

.sf-footer-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.sf-footer-desc {
  color: var(--text-secondary);
  margin: 0 0 0.75rem;
  line-height: 1.55;
}

.sf-footer-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.sf-footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sf-footer-links li {
  margin-bottom: 0.45rem;
}

.sf-footer-links a {
  color: var(--text-secondary);
}

.sf-footer-links a:hover {
  color: var(--accent-primary);
}

.sf-footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.25rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 1.5rem;
}

.sf-footer-bottom p {
  margin: 0;
}

.sf-footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem 1.25rem;
}

.sf-footer-legal-links a {
  color: var(--text-secondary);
  font-weight: 500;
}

.sf-footer-legal-links a:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

/* Single-Column Info & Legal Static Pages (About, Privacy, Terms, Disclaimer) */
.sf-static-container {
  max-width: 900px;
}

.sf-static-body {
  padding-top: clamp(1.5rem, 3vw, 2.5rem);
  padding-bottom: clamp(2.5rem, 5vw, 4rem);
}

/* ==========================================================================
   Responsive Media Queries (Strict Descending Breakpoints)
   ========================================================================== */

/* 1. Compact Desktop / Laptop (1025px – 1240px) */
@media (max-width: 1240px) {
  .sf-site-subtitle {
    display: none;
  }

  .sf-kbd {
    display: none;
  }

  .sf-nav-list {
    gap: 0.85rem;
  }

  .sf-nav-link {
    font-size: 0.86rem;
  }

  /* Switch 3-column article layout to 2 columns (Main + Right ToC, Left Meta below) */
  .sf-article-grid {
    grid-template-columns: minmax(0, 1fr) 230px;
    gap: 1.75rem;
  }

  .sf-sidebar-left {
    grid-column: 1 / -1;
    order: 3;
    border-top: 1px solid var(--border-subtle);
    padding-top: 1.5rem;
  }

  .sf-meta-panel {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
  }

  .sf-meta-section {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
  }
}

/* 2. Tablet & Mobile Navigation Drawer Breakpoint (<= 1024px) */
@media (max-width: 1024px) {
  .sf-site-subtitle {
    display: block;
  }

  .sf-mobile-toggle {
    display: inline-flex;
  }

  .sf-header-controls {
    padding-left: 0;
    border-left: none;
  }

  .sf-nav-menu-wrapper {
    display: none;
    margin-right: 0;
    position: absolute;
    top: calc(100% + 0.85rem);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border: 1px solid var(--border-strong);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: 1.25rem;
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
    z-index: 950;
  }

  .sf-nav-menu-wrapper.is-active {
    display: flex;
  }

  .sf-nav {
    margin: 0;
    width: 100%;
  }

  .sf-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    width: 100%;
  }

  .sf-nav-link {
    display: block;
    padding: 0.65rem 0.5rem;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 0.96rem;
  }

  .sf-header-actions {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0.65rem;
    width: 100%;
  }

  .sf-search-btn,
  .sf-auth-widget {
    flex: 1 1 180px;
  }

  .sf-search-btn,
  .sf-auth-widget .sf-btn {
    width: 100%;
    justify-content: center;
    height: 40px;
  }

  /* Content grids stack or adapt on tablets */
  .sf-hero-grid,
  .sf-dual-feed {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.75rem;
  }

  .sf-discipline-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sf-article-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.75rem;
  }

  .sf-article-main {
    order: 1;
  }

  .sf-sidebar-left {
    order: 2;
  }

  .sf-sidebar-right {
    display: none;
  }

  .sf-toc-mobile {
    display: block;
  }

  .sf-footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.75rem;
  }
}

/* 3. Small Tablets & Large Phones (<= 680px) */
@media (max-width: 680px) {
  .sf-discipline-grid,
  .sf-archive-grid,
  .sf-terms-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .sf-article-byline-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .sf-post-nav {
    grid-template-columns: minmax(0, 1fr);
  }

  .sf-post-nav-next {
    text-align: left;
  }

  .sf-modal-backdrop {
    padding: 0.75rem;
    align-items: center;
  }

  .sf-modal {
    max-width: 100%;
    max-height: 92vh;
    display: flex;
    flex-direction: column;
  }

  .sf-auth-body,
  .sf-modal-body,
  .sf-search-results {
    overflow-y: auto;
    max-height: calc(92vh - 68px);
  }
}

/* 4. Mobile Phones (<= 540px) */
@media (max-width: 540px) {
  .sf-masthead {
    padding: 0.7rem 0;
  }

  .sf-crest {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .sf-site-title {
    font-size: 1.12rem;
  }

  .sf-site-subtitle {
    display: none;
  }

  .sf-theme-toggle {
    padding: 0.35rem 0.55rem;
    font-size: 0.78rem;
  }

  .sf-hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .sf-hero-actions .sf-btn,
  .sf-paywall-actions .sf-btn {
    width: 100%;
  }

  .sf-footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
  }

  .sf-meta-panel {
    grid-template-columns: minmax(0, 1fr);
  }

  .sf-auth-tabs {
    grid-template-columns: 1fr;
  }
}