/* ===== Use case — catalog page ===== */
.uc-hero {
  position: relative;
  padding: clamp(64px, 9vw, 128px) 0 clamp(40px, 5vw, 64px);
  overflow: hidden;
  isolation: isolate;
}
.uc-hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(60% 60% at 50% 0%, var(--accent-soft) 0%, transparent 70%),
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 56px 56px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 56px 56px;
  mask-image: radial-gradient(80% 60% at 50% 30%, #000 30%, transparent 80%);
  z-index: -1;
}
.uc-hero h1 {
  max-width: 22ch;
  margin-bottom: 20px;
}
.uc-hero .lead { max-width: 64ch; }

.uc-toolbar {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin-bottom: 28px;
}
.uc-search {
  flex: 1 1 280px;
  display: inline-flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  min-width: 0;
  transition: border-color .2s;
}
.uc-search:focus-within { border-color: var(--accent-ring); }
.uc-search svg { width: 16px; height: 16px; color: var(--fg-soft); flex: 0 0 16px; }
.uc-search input {
  flex: 1; min-width: 0; border: 0; outline: 0; background: transparent;
  font-size: 14px; color: var(--fg);
}
.uc-search input::placeholder { color: var(--fg-soft); }

.uc-count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--fg-soft);
}

/* Bigger catalog tiles */
.uc-cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.uc-cat-tile {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 18px;
  min-height: 240px;
  padding: 26px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  transition: border-color .2s, transform .2s, background .2s;
  overflow: hidden;
}
.uc-cat-tile:hover {
  border-color: var(--accent-ring);
  transform: translateY(-2px);
  background:
    linear-gradient(var(--accent-soft) 0%, transparent 60%),
    var(--surface);
}
.uc-cat-tile .tile-head {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--fg-soft);
}
.uc-cat-tile .tile-head .cat {
  display: inline-block; width: 8px; height: 8px; border-radius: 999px;
  background: var(--accent);
}
.uc-cat-tile[data-cat="security"] .tile-head .cat { background: var(--brand-yellow); }
.uc-cat-tile[data-cat="ux"] .tile-head .cat { background: var(--brand-blue); }
.uc-cat-tile[data-cat="cost"] .tile-head .cat { background: var(--ok); }

.uc-cat-tile h3 { font-size: 21px; line-height: 1.18; margin-bottom: 10px; }
.uc-cat-tile p { font-size: 14px; color: var(--fg-muted); }

.uc-cat-tile .tile-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  font-size: 13px;
}
.uc-cat-tile .tile-foot .deep {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--fg);
  font-weight: 600;
}
.uc-cat-tile .tile-foot .deep svg { transition: transform .2s; }
.uc-cat-tile:hover .tile-foot .deep { color: var(--accent); }
.uc-cat-tile:hover .tile-foot .deep svg { transform: translateX(3px); }
.uc-cat-tile .tile-foot .quick {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-soft);
  text-transform: uppercase;
  letter-spacing: .1em;
}

.uc-empty {
  padding: 48px 24px;
  text-align: center;
  color: var(--fg-soft);
  border: 1px dashed var(--hairline-strong);
  border-radius: var(--r-lg);
}

/* ===== Use case — detail page ===== */
.ucd-breadcrumb {
  display: inline-flex; align-items: center; gap: 8px;
  padding-top: 32px;
  font-size: 13px;
  color: var(--fg-soft);
}
.ucd-breadcrumb a { color: var(--fg-muted); }
.ucd-breadcrumb a:hover { color: var(--accent); }
.ucd-breadcrumb .sep { opacity: .5; }

.ucd-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(32px, 4.5vw, 72px);
  align-items: center;
  padding: clamp(40px, 5vw, 72px) 0 clamp(48px, 6vw, 96px);
}
@media (max-width: 980px) { .ucd-hero { grid-template-columns: 1fr; } }

.ucd-hero .case-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  border-radius: 999px;
  margin-bottom: 18px;
}
.ucd-hero h1 {
  font-size: clamp(34px, 4.5vw, 60px);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 18px;
}
.ucd-hero .lead { max-width: 56ch; }
.ucd-hero .hero-actions { margin-top: 28px; }

.ucd-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-block: clamp(40px, 5vw, 72px);
}
@media (max-width: 720px) { .ucd-stats { grid-template-columns: 1fr; } }

.ucd-stat {
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  display: grid; gap: 8px;
}
.ucd-stat .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--accent);
  line-height: 1;
}
.ucd-stat .stat-label { font-size: 14px; color: var(--fg-muted); }

/* Two-column: problem / solution */
.ucd-twocol {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 760px) { .ucd-twocol { grid-template-columns: 1fr; } }
.ucd-card {
  padding: 28px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  background: var(--surface);
  display: grid;
  align-content: start;
  gap: 14px;
}
.ucd-card h3 { font-size: 22px; }
.ucd-card .ucd-mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--fg-soft);
}
.ucd-card.problem { border-color: color-mix(in oklab, var(--err) 30%, var(--hairline)); }
.ucd-card.problem .ucd-mono { color: var(--err); }
.ucd-card.solution { border-color: color-mix(in oklab, var(--accent) 35%, var(--hairline)); background: linear-gradient(var(--accent-soft) 0%, transparent 80%), var(--surface); }
.ucd-card.solution .ucd-mono { color: var(--accent); }
.ucd-card ul { padding-left: 18px; display: grid; gap: 8px; color: var(--fg-muted); font-size: 14.5px; }
.ucd-card ul li::marker { color: var(--fg-faint); }

/* How it works steps */
.ucd-steps {
  display: grid;
  gap: 18px;
}
.ucd-step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  align-items: start;
}
.ucd-step .step-num {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
}
.ucd-step .step-body { display: grid; gap: 8px; }
.ucd-step h4 { font-size: 18px; line-height: 1.25; }
.ucd-step p { color: var(--fg-muted); font-size: 14.5px; }

/* Code block */
.ucd-code {
  position: relative;
  margin-top: 12px;
  padding: 16px 18px;
  background: var(--bg);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg);
  overflow-x: auto;
}
.ucd-code pre { margin: 0; }
.ucd-code .ln-comment { color: var(--fg-soft); }
.ucd-code .ln-key { color: var(--brand-yellow); }
.ucd-code .ln-str { color: #8aa6ff; }
.ucd-code .ln-num { color: var(--ok); }
[data-theme="light"] .ucd-code .ln-str { color: #2a4fb8; }
[data-theme="light"] .ucd-code .ln-num { color: #047857; }
.ucd-code .lang-tag {
  position: absolute; top: 10px; right: 12px;
  font-size: 10px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--fg-soft);
}

/* Sequence diagram */
.ucd-flow {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding: 28px 24px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
}
@media (max-width: 720px) { .ucd-flow { grid-template-columns: 1fr; } }
.ucd-flow-node {
  display: grid; gap: 8px;
  padding: 18px;
  background: var(--bg);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  text-align: center;
}
.ucd-flow-node .nm {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent);
}
.ucd-flow-node .nb { font-weight: 700; font-size: 16px; }
.ucd-flow-node .nd { font-size: 13px; color: var(--fg-muted); }
.ucd-flow-arrow {
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-soft);
  text-align: center;
  position: relative;
}
.ucd-flow-arrow::before {
  content: "";
  position: absolute; left: 0; right: 0; top: 50%;
  height: 1px; background: var(--hairline-strong);
}
.ucd-flow-arrow span {
  position: relative;
  background: var(--surface);
  padding: 4px 10px;
}
@media (max-width: 720px) {
  .ucd-flow-arrow::before { left: 50%; right: auto; top: 0; bottom: 0; width: 1px; height: auto; }
  .ucd-flow-arrow span { padding: 6px 12px; background: var(--surface); }
}

/* Config / FAQ */
.ucd-faq dt {
  font-weight: 700;
  font-size: 16px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--hairline);
}
.ucd-faq dt:first-child { border-top: 0; padding-top: 0; }
.ucd-faq dd {
  margin: 6px 0 0;
  color: var(--fg-muted);
  font-size: 14.5px;
}

/* Related cases */
.ucd-related {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}
.ucd-related a {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  display: grid; gap: 8px;
  transition: border-color .2s, transform .2s;
}
.ucd-related a:hover { border-color: var(--accent-ring); transform: translateY(-2px); }
.ucd-related a .rl-cat {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--fg-soft);
}
.ucd-related a h4 { font-size: 16px; line-height: 1.3; }

/* Section title small variant */
.ucd-section-title {
  display: flex; align-items: baseline; gap: 12px;
  margin-bottom: 24px;
}
.ucd-section-title h2 { font-size: clamp(24px, 2.6vw, 32px); }
.ucd-section-title .num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--accent);
  text-transform: uppercase;
}

/* Compact section spacing on detail page */
.section.compact { padding-block: clamp(40px, 5vw, 72px); }

/* ===== Browser-frame demo card (use-case hero) ===== */
.browser-frame {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}
.browser-frame::before {
  /* Subtle accent halo behind the card */
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(140deg, var(--accent-ring), transparent 40%, transparent 70%, var(--accent-ring));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: .55;
  pointer-events: none;
  z-index: 1;
}

.bf-bar {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 14px;
  background: linear-gradient(180deg, var(--surface-2) 0%, var(--surface) 100%);
  border-bottom: 1px solid var(--hairline);
}
.bf-dots { display: inline-flex; gap: 6px; flex: 0 0 auto; }
.bf-dots span {
  width: 11px; height: 11px; border-radius: 999px;
  background: var(--hairline-strong);
}
.bf-dots span:nth-child(1) { background: #ff5f57; }
.bf-dots span:nth-child(2) { background: #febc2e; }
.bf-dots span:nth-child(3) { background: #28c840; }
[data-theme="dark"] .bf-dots span:nth-child(1) { background: #f87171; }
[data-theme="dark"] .bf-dots span:nth-child(2) { background: var(--brand-yellow); }
[data-theme="dark"] .bf-dots span:nth-child(3) { background: var(--ok); }

.bf-url {
  flex: 1; min-width: 0;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  background: var(--bg);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-muted);
  overflow: hidden;
}
.bf-url svg { color: var(--ok); flex: 0 0 11px; }
.bf-url span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.bf-tag {
  flex: 0 0 auto;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  background: color-mix(in oklab, var(--ok) 16%, transparent);
  color: var(--ok);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-weight: 600;
}
.bf-tag::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 999px;
  background: var(--ok);
  box-shadow: 0 0 0 0 color-mix(in oklab, var(--ok) 60%, transparent);
  animation: bf-pulse 2s ease-out infinite;
}
@keyframes bf-pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in oklab, var(--ok) 60%, transparent); }
  70%  { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.bf-body {
  position: relative;
  aspect-ratio: 16 / 10;
  background:
    radial-gradient(120% 80% at 0% 0%, var(--accent-soft) 0%, transparent 55%),
    radial-gradient(100% 80% at 100% 100%, color-mix(in oklab, var(--brand-blue) 14%, transparent) 0%, transparent 60%),
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 32px 32px,
    var(--bg);
  display: grid;
  place-items: center;
  overflow: hidden;
}
.bf-body video {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  z-index: 2;
}

.bf-fallback {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 10px;
  justify-items: center;
  text-align: center;
  padding: 28px;
  max-width: 80%;
}
.bf-fallback-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 4px 10px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-ring);
  border-radius: 999px;
}
.bf-fallback-title {
  font-size: clamp(15px, 1.6vw, 19px);
  font-weight: 600;
  color: var(--fg);
  line-height: 1.25;
  max-width: 28ch;
  letter-spacing: -0.01em;
}
.bf-fallback::after {
  /* Live demo signal: a soft accent disc */
  content: "▶";
  display: grid;
  place-items: center;
  width: 56px; height: 56px;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-ring);
  color: var(--accent);
  font-size: 16px;
  line-height: 1;
  padding-left: 3px;
  margin-bottom: 6px;
  order: -1;
}

/* Tech Terminal Syntax Highlighting for ucd-code */
.tech-terminal-cmd { color: #eaf0ff; }
.tech-terminal-exe { color: #34d399; font-weight: 500; }
.tech-terminal-flag { color: #aab4cf; }
.tech-terminal-str { color: #8aa6ff; }
.tech-terminal-pipe { color: #4a5374; margin-inline: 4px; }
.tech-terminal-token {
  background: rgba(244, 187, 51, 0.14);
  border: 1px dashed #f4bb33;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 700;
  color: #f4bb33;
  font-size: 13px;
}