/* ──────────────────────────────────────────────────────────────────────────
   case.css · shared structural CSS for case-studies/ tree
   Both palettes (silver, green) reference this single file.
   Palette tokens are declared in each HTML file's inline <style>:
   --bg, --white, --silver, --silver-mid, --silver-dim, --silver-gradient,
   --bar-primary, --bar-secondary, --bar-tertiary, --gradient-text, --topbar-bg.
   ──────────────────────────────────────────────────────────────────────── */

:root {
  --border:          rgba(255, 255, 255, 0.08);
  --border-hover:    rgba(255, 255, 255, 0.20);
  --glass-bg:        rgba(255, 255, 255, 0.02);
  --radius-card:     1rem;
  --font-serif:      'Fraunces', Georgia, serif;
  --font-mono:       'Geist Mono', 'JetBrains Mono', 'Courier New', monospace;
  --font-sans:       'Inter', system-ui, sans-serif;
  --easing:          cubic-bezier(0.16, 1, 0.3, 1);
  --width:           92vw;
  --read-width:      720px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background-color: var(--bg);
  color: var(--silver);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
}
.silver-text {
  background: var(--silver-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
a { color: inherit; }

/* ── TOP BAR (library + case pages) ─────────────────────────────────── */
.cs-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 4vw;
  background: var(--topbar-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.cs-topbar a { text-decoration: none; }
.cs-topbar .brand-mark {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 22px;
  color: var(--white);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}
.brand-logo {
  height: 36px;
  width: 36px;
  display: block;
  flex-shrink: 0;
}
.cs-topbar-links { display: flex; gap: 1.5rem; align-items: center; }
.cs-topbar-link {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--silver-mid);
  transition: color 0.25s ease;
}
.cs-topbar-link:hover { color: var(--white); }
.cs-topbar-cta {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gradient-text);
  background: var(--silver-gradient);
  padding: 0.55rem 1.1rem;
  border-radius: 0.6rem;
}

/* ── LIBRARY HERO ───────────────────────────────────────────────────── */
.cs-hero {
  position: relative;
  z-index: 1;
  padding: 6rem 0 2rem;
  width: var(--width);
  margin: 0 auto;
}
.cs-section-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.30em;
  text-transform: uppercase;
  color: var(--silver-mid);
  margin-bottom: 1.5rem;
  display: block;
}
.cs-hero h1 {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(40px, 5.5vw, 72px);
  line-height: 1.05;
  color: var(--white);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}
.cs-hero h1 em { font-style: italic; }
.cs-hero-desc {
  font-size: 16px;
  font-weight: 300;
  line-height: 1.65;
  color: var(--silver-mid);
  max-width: 580px;
}

/* ── LIBRARY FILTER (CSS-only via :has() + radios) ──────────────────── */
.cs-filter-bar {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  width: var(--width);
  margin: 2rem auto 2.5rem;
}
.cs-filter-bar input[type="radio"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.cs-filter-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--silver-mid);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.25s ease, background 0.25s ease, border-color 0.25s ease;
  user-select: none;
}
.cs-filter-btn:hover { color: var(--silver); border-color: var(--border-hover); }
.cs-filter-bar input[type="radio"]:focus-visible + .cs-filter-btn {
  outline: 2px solid var(--silver);
  outline-offset: 2px;
}
.cs-filter-bar input[type="radio"]:checked + .cs-filter-btn {
  background: var(--silver-gradient);
  color: var(--gradient-text);
  border-color: transparent;
}
/* :has() filter · show only matching cards */
body:has(#f-ads:checked)     .case-card[data-category]:not([data-category="ads"])     { display: none; }
body:has(#f-pricing:checked) .case-card[data-category]:not([data-category="pricing"]) { display: none; }
body:has(#f-product:checked) .case-card[data-category]:not([data-category="product"]) { display: none; }

/* ── LIBRARY GRID (standalone bento tiles) ──────────────────────────── */
.cs-library {
  position: relative;
  z-index: 1;
  width: var(--width);
  margin: 0 auto;
  padding-bottom: 4rem;
}
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.case-card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 2.25rem 1.85rem 2rem;
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.3s var(--easing), box-shadow 0.3s ease, border-color 0.3s ease;
}
.case-card:hover {
  background: rgba(255,255,255,0.05);
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.28);
}
.case-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.case-chip {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.30em;
  text-transform: uppercase;
  color: var(--silver-mid);
  padding: 0.32rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,0.02);
}
.case-date {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.30em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.30);
}
.case-card .case-title {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(22px, 2vw, 28px);
  line-height: 1.1;
  color: var(--white);
  margin-bottom: 1rem;
}
.case-card .case-body {
  font-size: 13px;
  font-weight: 300;
  line-height: 1.75;
  color: var(--silver-mid);
  margin-bottom: 1.75rem;
}
.case-stats {
  display: flex;
  gap: 1.5rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-top: auto;
  margin-bottom: 1.5rem;
}
.case-stat { display: flex; flex-direction: column; gap: 0.2rem; }
.case-stat-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--silver);
  letter-spacing: 0.05em;
}
.case-stat-label {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.30em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.22);
}
.case-cta {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--silver);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color 0.25s ease, transform 0.25s var(--easing);
}
.case-card:hover .case-cta { color: var(--white); transform: translateX(2px); }
.case-icon {
  position: absolute;
  bottom: -0.5rem;
  right: 0.5rem;
  font-size: 5rem;
  opacity: 0.04;
  pointer-events: none;
  user-select: none;
  transition: opacity 0.35s ease;
}
.case-card:hover .case-icon { opacity: 0.07; }

.cs-empty-state {
  width: var(--width);
  margin: 3rem auto 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--silver-mid);
}
.cs-empty-state a { color: var(--white); text-decoration: underline; text-underline-offset: 4px; }

/* ── INDIVIDUAL CASE PAGE · HERO ─────────────────────────────────────── */
.case-hero {
  position: relative;
  z-index: 1;
  width: var(--width);
  max-width: 1200px;
  margin: 0 auto;
  padding: 5rem 0 3rem;
}
.case-hero::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -120px;
  width: 420px;
  height: 420px;
  transform: translateY(-50%) rotate(-8deg);
  background-image: url('../assets/imago-mark.svg');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0.04;
  pointer-events: none;
  z-index: -1;
}
@media (max-width: 900px) {
  .case-hero::after { width: 280px; height: 280px; right: -80px; opacity: 0.03; }
}
.case-hero .case-meta-row {
  margin-bottom: 2rem;
}
.case-hero .case-chip {
  font-size: 10px;
  padding: 0.4rem 0.85rem;
}
.case-chip.case-chip-date { color: rgba(255,255,255,0.40); }
.case-hero h1 {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(38px, 5vw, 68px);
  line-height: 1.05;
  color: var(--white);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  max-width: 18ch;
}
.case-hero h1 em { font-style: italic; }
.case-hero-sub {
  font-size: 18px;
  font-weight: 300;
  line-height: 1.6;
  color: var(--silver-mid);
  max-width: 640px;
}

/* ── INDIVIDUAL CASE PAGE · BODY ─────────────────────────────────────── */
article.case-body {
  position: relative;
  z-index: 1;
  width: var(--width);
  max-width: var(--read-width);
  margin: 0 auto;
  padding: 1rem 0 4rem;
  font-size: 16px;
  font-weight: 300;
  line-height: 1.75;
  color: var(--silver);
  margin-bottom: 0;
}
article.case-body section { margin-bottom: 3.5rem; }
article.case-body h2 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.30em;
  text-transform: uppercase;
  color: var(--silver-mid);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}
article.case-body p {
  font-size: 16px;
  font-weight: 300;
  line-height: 1.75;
  color: var(--silver);
  margin-bottom: 1.25rem;
}
article.case-body p:last-child { margin-bottom: 0; }
article.case-body ul {
  list-style: none;
  padding: 0;
}
article.case-body ul li {
  font-size: 16px;
  line-height: 1.75;
  color: var(--silver);
  padding-left: 1.5rem;
  position: relative;
  margin-bottom: 0.85rem;
}
article.case-body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 6px;
  height: 6px;
  background: var(--silver-gradient);
  border-radius: 50%;
}
article.case-body strong { color: var(--white); font-weight: 500; }

/* ── STAT STRIP ─────────────────────────────────────────────────────── */
.case-stat-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.75rem 0 1rem;
}
.case-stat-tile {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: rgba(255,255,255,0.025);
}
.case-stat-tile-val {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  color: var(--white);
  display: block;
  margin-bottom: 0.35rem;
}
.case-stat-tile-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.30em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.40);
}

/* ── VISUAL (palette-aware SVG fills) ───────────────────────────────── */
.case-visual {
  margin: 2rem 0 0;
  padding: 2rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: rgba(255,255,255,0.02);
}
.case-visual svg { width: 100%; height: auto; display: block; }
.case-visual-caption {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.30);
  margin-top: 1rem;
  text-align: center;
}
/* SVG fill classes · palette-driven via tokens */
.bar-primary   { fill: var(--bar-primary); }
.bar-secondary { fill: var(--bar-secondary); }
.bar-tertiary  { fill: var(--bar-tertiary); }
/* SVG stroke classes for line charts */
.line-primary   { stroke: var(--bar-primary);   fill: none; }
.line-secondary { stroke: var(--bar-secondary); fill: none; }

.ads-legend {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}
.ads-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--silver-mid);
}
.ads-legend-swatch {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  display: inline-block;
}
.ads-legend-swatch.swatch-primary   { background: var(--bar-primary); }
.ads-legend-swatch.swatch-secondary { background: var(--bar-secondary); }

/* ── CASE CTA STRIP ─────────────────────────────────────────────────── */
.case-cta-strip {
  position: relative;
  z-index: 1;
  width: var(--width);
  max-width: 1200px;
  margin: 2rem auto 5rem;
  padding: 3rem 2rem;
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
  overflow: hidden;
}
.case-cta-strip::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 460px;
  height: 460px;
  transform: translate(-50%, -50%);
  background-image: url('../assets/imago-mark.svg');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0.05;
  pointer-events: none;
  z-index: -1;
}
.case-cta-strip > * { position: relative; z-index: 1; }
@media (max-width: 700px) {
  .case-cta-strip::after { width: 320px; height: 320px; }
}
.case-cta-strip h3 {
  font-family: var(--font-serif);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(28px, 3vw, 38px);
  color: var(--white);
  line-height: 1.2;
  max-width: 22ch;
}
.case-cta-strip p {
  font-size: 15px;
  color: var(--silver-mid);
  max-width: 480px;
}
.case-cta-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gradient-text);
  background: var(--silver-gradient);
  padding: 0.85rem 1.75rem;
  border-radius: 0.6rem;
  text-decoration: none;
  transition: transform 0.2s var(--easing), box-shadow 0.2s ease;
}
.case-cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 16px rgba(255,255,255,0.14);
}

/* ── FOOTER ─────────────────────────────────────────────────────────── */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
  margin-top: 5rem;
}
.footer-inner {
  width: var(--width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: center;
  justify-content: space-between;
}
.footer-left { display: flex; flex-direction: column; gap: 0.4rem; }
.footer-brand {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 28px;
  color: var(--white);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}
.footer-logo {
  height: 40px;
  width: 40px;
  display: block;
  flex-shrink: 0;
}
.footer-tagline {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--silver-mid);
}
.footer-links { display: flex; gap: 2.25rem; flex-wrap: wrap; }
.footer-link {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--silver-mid);
  text-decoration: none;
  transition: color 0.25s ease;
}
.footer-link:hover { color: var(--silver); }
.footer-copy {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.25);
}

/* ── RESPONSIVE ─────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .case-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 700px) {
  .case-grid { grid-template-columns: 1fr; }
  .case-hero { padding: 3rem 0 2rem; }
  .case-stat-strip { grid-template-columns: 1fr; }
  .cs-topbar-links { gap: 0.85rem; }
  .cs-topbar-link { font-size: 10px; letter-spacing: 0.14em; }
  .footer-links { gap: 1.25rem; justify-content: center; }
  .footer-inner { justify-content: center; text-align: center; }
}