/* ═══════════════════════════════════════════════════════
   ARKADEB MONDAL — ADM-OS CASE STUDY SYSTEM
   Theme: OLED Dark (#0C0D10) · Dot Matrix Grid · Signal Red (#8C99D1)
   Typography: Geist Mono
   Aesthetic: Nothing UI / Tactical Console / Cyberpunk Dark
   Companion to: assets/css/styles.css
   ═══════════════════════════════════════════════════════ */


/* ── 1. RESET & CASE STUDY ROOT TOKENS ────────────────── */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

.cs-body {
  font-family: 'Geist Mono', monospace;
  background-color: #0C0D10;
  background-image: radial-gradient(circle, #23262E 1.2px, transparent 1.2px);
  background-size: 16px 16px;
  color: #EDEDF2;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  margin: 0;
  padding: 0;
}

/* Card Reveal & Bi-directional Fade In / Fade Out */
.cs-stat-card,
.cs-pain-card,
.cs-rstat,
.cs-insight-card,
.cs-journey-card,
.cs-placeholder,
.cs-pullquote,
.cs-ba-item,
.cs-caption-item {
  opacity: 0;
  transform: translateY(28px) scale(0.985);
  filter: blur(4px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.65s cubic-bezier(0.16, 1, 0.3, 1),
              filter 0.65s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 200ms ease,
              box-shadow 200ms ease;
  will-change: opacity, transform, filter;
}

.cs-stat-card.is-inview,
.cs-pain-card.is-inview,
.cs-rstat.is-inview,
.cs-insight-card.is-inview,
.cs-journey-card.is-inview,
.cs-placeholder.is-inview,
.cs-pullquote.is-inview,
.cs-ba-item.is-inview,
.cs-caption-item.is-inview {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0);
}

@media (prefers-reduced-motion: reduce) {
  .cs-stat-card,
  .cs-pain-card,
  .cs-rstat,
  .cs-insight-card,
  .cs-journey-card,
  .cs-placeholder,
  .cs-pullquote,
  .cs-ba-item,
  .cs-caption-item {
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
    transition: none !important;
  }
}

/* ── 2. CONTAINERS ─────────────────────────────────────── */
.cs-container {
  max-width: 1160px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 80px);
}

.cs-container--wide {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 60px);
}

/* ── 3. TACTICAL STICKY TOP NAV ───────────────────────── */
.cs-topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(12, 13, 16, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid #23262E;
  padding-block: 14px;
  transition: background-color 200ms ease, border-color 200ms ease;
}

.cs-topnav.scrolled {
  background-color: rgba(12, 13, 16, 0.96);
  border-bottom-color: #343846;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.7);
}

.cs-topnav-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  justify-content: space-between;
}

.cs-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #A3A7B7;
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 6px;
  background: #131418;
  border: 1px solid #23262E;
  transition: color 200ms ease, border-color 200ms ease, box-shadow 200ms ease, transform 200ms ease;
  white-space: nowrap;
  flex-shrink: 0;
}

.cs-back-link:hover {
  color: #EDEDF2;
  border-color: #8C99D1;
  box-shadow: 0 0 12px rgba(140, 153, 209, 0.35);
  transform: translateX(-2px);
}

.cs-back-link svg {
  color: #8C99D1;
}

/* Standardized Icon Size Token (16x16) across Nav, Footer, and Content */
.icon-std {
  width: 16px !important;
  height: 16px !important;
  min-width: 16px !important;
  min-height: 16px !important;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  flex-shrink: 0;
}

/* Monochromatic Tactical Pill Nav */
.cs-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  background-color: #14151A;
  border: 1px solid #23262E;
  border-radius: 100px;
  padding: 4px;
  flex-wrap: nowrap;
  overflow-x: auto;
}

.cs-tab {
  display: block;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #8C90A2;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 100px;
  transition: color 200ms ease, background-color 200ms ease, box-shadow 200ms ease;
  white-space: nowrap;
}

.cs-tab:hover {
  color: #EDEDF2;
  background-color: #20222A;
}

.cs-tab.active {
  color: #0C0D10;
  background-color: #8C99D1;
  box-shadow: 0 0 12px rgba(140, 153, 209, 0.45);
}

/* ── 4. HERO SECTION ─────────────────────────────────── */
.cs-hero {
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(32px, 5vw, 56px);
  position: relative;
}

.cs-hero-content {
  text-align: center;
  max-width: 860px;
  margin-inline: auto;
  margin-bottom: clamp(32px, 5vw, 52px);
}

.hero-prompt-row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 4px 12px;
  background: rgba(140, 153, 209, 0.08);
  border: 1px solid rgba(140, 153, 209, 0.25);
  border-radius: 4px;
}

.prompt-symbol {
  color: #8C99D1;
  font-weight: 700;
  font-size: 12px;
}

.prompt-text {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #E2E8F0;
  text-transform: uppercase;
}

.cs-label {
  display: inline-block;
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  color: #8C99D1;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.cs-h1 {
  font-family: 'Geist Mono', monospace;
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  color: #EDEDF2;
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

/* ── 5. META GRID SPEC ───────────────────────────────── */
.cs-meta-row {
  padding-block: 20px 48px;
}

.cs-meta-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  background: #131418;
  border: 1px solid #23262E;
  border-radius: 12px;
  padding: 20px 24px;
  text-align: center;
}

@media (max-width: 800px) {
  .cs-meta-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .cs-meta-grid {
    grid-template-columns: 1fr;
  }
}

.cs-meta-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
}

.cs-meta-label {
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8C99D1;
}

.cs-meta-value {
  font-family: 'Geist Mono', monospace;
  font-size: 13.5px;
  font-weight: 600;
  color: #EDEDF2;
  line-height: 1.4;
}

.cs-meta-sub {
  color: #7D8294;
  font-size: 11.5px;
  font-weight: 400;
}

/* ── 6. SECTIONS & TYPOGRAPHY ────────────────────────── */
.cs-section {
  padding-block: clamp(48px, 6vw, 76px);
  border-top: 1px solid #20222A;
  text-align: center;
}

.cs-section--last {
  border-bottom: 1px solid #20222A;
}

.cs-eyebrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #8C99D1;
  margin-inline: auto;
  margin-bottom: 12px;
  background: rgba(140, 153, 209, 0.08);
  border: 1px solid rgba(140, 153, 209, 0.3);
  border-radius: 4px;
  padding: 4px 12px;
}

.cs-h2 {
  font-family: 'Geist Mono', monospace;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #EDEDF2;
  line-height: 1.25;
  margin-inline: auto;
  margin-bottom: 20px;
  text-transform: uppercase;
  text-align: center;
  max-width: 860px;
}

.cs-h3 {
  font-family: 'Geist Mono', monospace;
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  color: #E6E7EE;
  margin-top: 36px;
  margin-bottom: 14px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  text-align: center;
  margin-inline: auto;
  max-width: 800px;
}

.cs-body {
  font-family: 'Geist Mono', system-ui, sans-serif;
  font-size: 15.5px;
  color: #A0AEC0;
  line-height: 1.75;
  max-width: 820px;
  text-align: center;
  margin-inline: auto;
}

.cs-body--mt {
  margin-top: 20px;
}

.cs-body--closing {
  margin-top: 28px;
  font-weight: 500;
  color: #CACCD6;
}

/* ── 7. STATS MATRIX ─────────────────────────────────── */
.cs-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-block: 32px;
}

@media (max-width: 768px) {
  .cs-stats-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

.cs-stat-card {
  background: #131418;
  border: 1px solid #23262E;
  border-radius: 12px;
  padding: 24px;
  position: relative;
  overflow: hidden;
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.cs-stat-card:hover {
  transform: translateY(-3px);
  border-color: #8C99D1;
  box-shadow: 0 0 20px rgba(140, 153, 209, 0.25);
}

.cs-stat-icon {
  width: 32px;
  height: 32px;
  color: #8C99D1;
  margin-bottom: 14px;
  margin-inline: auto;
}

.cs-stat-icon svg {
  width: 100%;
  height: 100%;
}

.cs-stat-num {
  font-family: 'Geist Mono', monospace;
  font-size: clamp(36px, 4.5vw, 48px);
  font-weight: 700;
  color: #EDEDF2;
  line-height: 1;
  margin-bottom: 8px;
}

.cs-stat-title {
  font-family: 'Geist Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #8C99D1;
  margin-bottom: 6px;
}

.cs-stat-desc {
  font-family: 'Geist Mono', system-ui, sans-serif;
  font-size: 13.5px;
  color: #8C90A2;
  line-height: 1.5;
  text-align: center;
}

/* ── 8. THREE COLUMN CARDS (PAIN POINTS & RESEARCH) ─── */
.cs-three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
}

@media (max-width: 800px) {
  .cs-three-col {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

.cs-pain-card {
  background: #131418;
  border: 1px solid #23262E;
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 8px;
  transition: transform 200ms ease, border-color 200ms ease;
}

.cs-pain-card:hover {
  transform: translateY(-3px);
  border-color: #8C99D1;
}

.cs-pain-num {
  font-family: 'Geist Mono', monospace;
  font-size: 18px;
  font-weight: 700;
  color: #8C99D1;
}

.cs-pain-title {
  font-family: 'Geist Mono', monospace;
  font-size: 15px;
  font-weight: 700;
  color: #EDEDF2;
  line-height: 1.35;
}

.cs-pain-desc {
  font-family: 'Geist Mono', system-ui, sans-serif;
  font-size: 13.5px;
  color: #A3A7B7;
  line-height: 1.6;
}

/* ── 9. RESEARCH STATS & PULLQUOTE ───────────────────── */
.cs-research-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-block: 32px;
}

@media (max-width: 768px) {
  .cs-research-stats {
    grid-template-columns: 1fr;
  }
}

.cs-rstat {
  background: #131418;
  border: 1px solid #23262E;
  border-radius: 12px;
  padding: 24px;
  text-align: center;
}

.cs-rstat-icon {
  width: 28px;
  height: 28px;
  color: #8C99D1;
  margin-inline: auto;
  margin-bottom: 12px;
}

.cs-rstat-icon svg {
  width: 100%;
  height: 100%;
}

.cs-rstat-num {
  font-family: 'Geist Mono', monospace;
  font-size: clamp(34px, 4vw, 44px);
  font-weight: 700;
  color: #EDEDF2;
  margin-bottom: 6px;
}

.cs-rstat-label {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  color: #8C99D1;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.cs-rstat-desc {
  font-family: 'Geist Mono', system-ui, sans-serif;
  font-size: 13px;
  color: #8C90A2;
  line-height: 1.5;
}

.cs-pullquote {
  margin-block: 40px;
  margin-inline: auto;
  max-width: 780px;
  padding: 28px 32px;
  background: #131418;
  border-top: 3px solid #8C99D1;
  border-left: 1px solid #23262E;
  border-right: 1px solid #23262E;
  border-bottom: 1px solid #23262E;
  border-radius: 12px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.cs-pullquote-mark {
  font-family: 'Geist Mono', monospace;
  font-size: 32px;
  font-weight: 700;
  color: #8C99D1;
  line-height: 1;
  margin-bottom: 8px;
  display: flex;
  justify-content: center;
}

.cs-pullquote-text {
  font-family: 'Geist Mono', system-ui, sans-serif;
  font-size: 17px;
  font-style: italic;
  color: #EDEDF2;
  line-height: 1.7;
  margin-bottom: 14px;
}

.cs-pullquote-cite {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  color: #8C99D1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ── 10. INSIGHTS GRID ───────────────────────────────── */
.cs-insights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 24px;
}

@media (max-width: 900px) {
  .cs-insights-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .cs-insights-grid {
    grid-template-columns: 1fr;
  }
}

.cs-insight-card {
  background: #131418;
  border: 1px solid #23262E;
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 10px;
  transition: transform 200ms ease, border-color 200ms ease;
}

.cs-insight-card:hover {
  transform: translateY(-3px);
  border-color: #8C99D1;
}

.cs-insight-icon {
  width: 28px;
  height: 28px;
  color: #8C99D1;
  margin-inline: auto;
}

.cs-insight-title {
  font-family: 'Geist Mono', monospace;
  font-size: 15px;
  font-weight: 700;
  color: #EDEDF2;
}

.cs-insight-desc {
  font-family: 'Geist Mono', system-ui, sans-serif;
  font-size: 13.5px;
  color: #A3A7B7;
  line-height: 1.6;
}

/* ── 11. USER JOURNEY GRID ───────────────────────────── */
.cs-journey-card {
  background: #131418;
  border: 1px solid #23262E;
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 10px;
  margin-top: 28px;
}

.cs-journey-stage {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  color: #8C99D1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.cs-journey-icon {
  width: 24px;
  height: 24px;
  color: #8C99D1;
  margin-bottom: 10px;
  margin-inline: auto;
}

.cs-journey-desc {
  font-family: 'Geist Mono', system-ui, sans-serif;
  font-size: 13px;
  color: #A0AEC0;
  line-height: 1.55;
}

/* ── 12. WIREFRAME & CAPTION ROWS ────────────────────── */
.cs-wireframe-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
  justify-content: center;
}

.cs-wireframe-row--mt {
  margin-top: 36px;
}

@media (max-width: 768px) {
  .cs-wireframe-row {
    grid-template-columns: 1fr;
  }
}

.cs-caption-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

@media (max-width: 768px) {
  .cs-caption-row {
    grid-template-columns: 1fr;
  }
}

.cs-caption-item {
  background: #131418;
  border: 1px solid #23262E;
  border-radius: 8px;
  padding: 16px 18px;
  text-align: center;
}

.cs-caption-title {
  font-family: 'Geist Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  color: #EDEDF2;
  margin-bottom: 4px;
}

.cs-caption-desc {
  font-family: 'Geist Mono', system-ui, sans-serif;
  font-size: 12.5px;
  color: #8C90A2;
  line-height: 1.5;
}

/* ── 13. TACTICAL PLACEHOLDERS (DARK WIREFRAME UI) ───── */
.cs-placeholder {
  width: 100%;
  border-radius: 12px;
  border: 1px solid #23262E;
  background-color: #0D0D0D;
  /* subtle dark grid pattern */
  background-image: 
    linear-gradient(to right, #1A1C22 1px, transparent 1px),
    linear-gradient(to bottom, #1A1C22 1px, transparent 1px);
  background-size: 24px 24px;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.7);
  transition: border-color 200ms ease, box-shadow 200ms ease;
}

.cs-placeholder:hover {
  border-color: #8C99D1;
  box-shadow: 0 0 24px rgba(140, 153, 209, 0.25);
}

.cs-placeholder-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 24px;
  text-align: center;
  color: #B0B4C3;
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(12, 13, 16, 0.7);
  border: 1px solid #23262E;
  border-radius: 8px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.cs-ph-icon {
  width: 32px;
  height: 32px;
  color: #8C99D1;
}

.cs-ph-icon--sm {
  width: 22px;
  height: 22px;
}

.cs-placeholder--hero {
  aspect-ratio: 16 / 9;
  max-height: 480px;
}

.cs-placeholder--dashboard {
  aspect-ratio: 16 / 9;
  max-height: 440px;
  margin-block: 28px;
}

.cs-placeholder--wire {
  aspect-ratio: 9 / 16;
  max-height: 520px;
}

.cs-placeholder--hifi {
  aspect-ratio: 16 / 10;
  max-height: 440px;
  margin-block: 28px;
}

.cs-placeholder--wide {
  aspect-ratio: 21 / 9;
  max-height: 380px;
  margin-block: 28px;
}

.cs-placeholder--ba {
  aspect-ratio: 9 / 16;
  max-height: 460px;
}

/* ── 14. BEFORE & AFTER ROW ──────────────────────────── */
.cs-ba-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 32px;
}

@media (max-width: 640px) {
  .cs-ba-row {
    grid-template-columns: 1fr;
  }
}

.cs-ba-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
}

.cs-ba-label {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #8C99D1;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ── 15. TESTING & LESSONS ───────────────────────────── */
.cs-testing,
.cs-learned {
  background: #131418;
  border: 1px solid #23262E;
  border-radius: 12px;
  padding: 28px;
  margin-top: 24px;
  text-align: center;
  margin-inline: auto;
  max-width: 860px;
}

/* ── 16. TACTICAL FOOTER ─────────────────────────────── */
.cs-footer {
  padding-top: clamp(36px, 5vw, 60px);
  padding-bottom: 32px;
  background: #08090B;
  border-top: 1px solid #23262E;
  margin-top: clamp(48px, 6vw, 80px);
}

.footer-terminal-banner {
  margin-bottom: 36px;
  text-align: center;
}

.terminal-line {
  display: inline-block;
  font-family: 'Geist Mono', monospace;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #555555;
  text-transform: uppercase;
}

.cs-footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 16px;
  padding-bottom: 24px;
}

@media (max-width: 600px) {
  .cs-footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

.cs-footer-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #CACCD6;
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 6px;
  background: #131418;
  border: 1px solid #23262E;
  transition: border-color 200ms ease, color 200ms ease, box-shadow 200ms ease, transform 200ms ease;
}

.btn-bracket {
  color: rgba(255, 255, 255, 0.4);
}

.cs-footer-back:hover {
  border-color: #8C99D1;
  color: #EDEDF2;
  box-shadow: 0 0 14px rgba(140, 153, 209, 0.4);
  transform: translateX(-2px);
}

.cs-footer-credit {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  color: #6E7385;
  letter-spacing: 0.02em;
}

/* ═══════════════════════════════════════════════════════
   17. COMPREHENSIVE MOBILE RESPONSIVE TWEAKS
   ═══════════════════════════════════════════════════════ */
@media (max-width: 640px) {
  .cs-container,
  .cs-container--wide {
    padding-inline: 16px;
  }

  .cs-topnav {
    padding-block: 10px;
  }

  .cs-topnav-inner {
    gap: 10px;
  }

  .cs-back-link {
    padding: 5px 10px;
    font-size: 11px;
    gap: 6px;
  }

  .cs-tabs {
    max-width: calc(100vw - 110px);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 3px;
  }

  .cs-tabs::-webkit-scrollbar {
    display: none;
  }

  .cs-tab {
    padding: 5px 10px;
    font-size: 10.5px;
  }

  .cs-hero-title {
    font-size: clamp(24px, 5.5vw, 36px);
    line-height: 1.25;
  }

  .cs-pullquote {
    font-size: 15.5px;
    padding: 18px 16px;
  }

  .cs-meta-grid {
    padding: 16px;
  }

  .cs-stat-card {
    padding: 18px 16px;
  }

  .cs-testing,
  .cs-learned {
    padding: 20px 16px;
  }

  .cs-footer-back {
    width: 100%;
    justify-content: center;
    font-size: 11.5px;
  }
}

@media (max-width: 440px) {
  .cs-container,
  .cs-container--wide {
    padding-inline: 14px;
  }

  .cs-tabs {
    max-width: calc(100vw - 84px);
  }

  .cs-stat-num {
    font-size: 32px;
  }
}