/* Knowledge base — builds on site.css tokens (--bg, --cyan, --violet, --gold, --grad ...) */

.kb-wrap { max-width: 780px; }
.kb-hero .kb-wrap, .kb-list .kb-wrap { max-width: 1040px; }

.kb-crumb {
  display: flex; gap: .55rem; align-items: center;
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .04em;
  color: var(--muted); margin: 0 0 2.4rem;
}
.kb-crumb a { color: var(--muted); text-decoration: none; }
.kb-crumb a:hover { color: var(--cyan); }
.kb-crumb span[aria-hidden] { opacity: .4; }

.kb-kicker {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .16em;
  text-transform: uppercase; margin: 0 0 1rem;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: var(--cyan);
}
.kb-h1 {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(2rem, 4.6vw, 3rem); line-height: 1.06; letter-spacing: -.022em;
  color: var(--rim); margin: 0 0 1.1rem; text-wrap: balance;
}
.kb-h1-lg { font-size: clamp(2.3rem, 6vw, 3.9rem); }
.kb-dek {
  font-size: 1.115rem; line-height: 1.62; color: var(--text);
  margin: 0 0 2.6rem; max-width: 64ch;
}

/* hero */
.kb-hero { padding: 8.4rem 0 3rem; }
.kb-list { padding: 0 0 6rem; }

/* video slot */
.kb-video {
  border: 1px solid var(--line); border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 50% 0%, rgba(201,107,255,.14), transparent 62%),
    var(--ink-raise);
  aspect-ratio: 16 / 9; display: grid; place-items: center;
  margin: 0 0 2.8rem; overflow: hidden; position: relative;
}
.kb-video::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(30deg, rgba(125,227,255,.06), transparent 45%, rgba(255,184,107,.05));
}
.kb-video video { width: 100%; height: 100%; object-fit: cover; display: block; }
.kb-video-inner { text-align: center; padding: 1.5rem; }
.kb-video-icon {
  display: block; width: 46px; height: 46px; margin: 0 auto 1rem; border-radius: 50%;
  border: 1px solid var(--line); background: var(--ink-tile); position: relative;
}
.kb-video-icon::before {
  content: ""; position: absolute; top: 50%; left: 52%; transform: translate(-50%,-50%);
  border-left: 12px solid var(--glass); border-top: 8px solid transparent;
  border-bottom: 8px solid transparent; opacity: .8;
}
.kb-video-note {
  font-family: var(--font-mono); font-size: .76rem; letter-spacing: .05em;
  color: var(--muted); margin: 0; line-height: 1.7;
}
.kb-video-note span { color: rgba(143,161,199,.62); }

/* stats */
.kb-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1px; background: var(--line-soft);
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; margin: 0 0 3rem;
}
.kb-stat { background: var(--ink-raise); padding: 1.4rem 1.35rem 1.2rem; }
.kb-stat-n {
  font-family: var(--font-display); font-weight: 800; font-size: 2.05rem;
  line-height: 1; letter-spacing: -.02em; margin-bottom: .6rem;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.kb-stat-c { font-size: .93rem; line-height: 1.5; color: var(--text); margin: 0 0 .7rem; }
.kb-stat-s {
  font-family: var(--font-mono); font-size: .66rem; line-height: 1.5;
  color: var(--muted); margin: 0; padding-top: .65rem;
  border-top: 1px solid var(--line-soft);
}

/* body */
.kb-h2 {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.42rem; line-height: 1.22; letter-spacing: -.014em;
  color: var(--rim); margin: 3.1rem 0 1.05rem; text-wrap: balance;
}
.kb-p { font-size: 1.028rem; line-height: 1.75; color: var(--text); margin: 0 0 1.15rem; }
.kb-p strong { color: var(--rim); font-weight: 600; }
.kb-p em { color: var(--glass); font-style: italic; }
.kb-p code {
  font-family: var(--font-mono); font-size: .87em;
  background: var(--ink-raise); border: 1px solid var(--line);
  border-radius: 5px; padding: .1em .38em; color: var(--cyan);
}

/* related */
.kb-related { margin: 4rem 0 0; padding-top: 2.2rem; border-top: 1px solid var(--line); }
.kb-related ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 1px; background: var(--line-soft); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.kb-related a {
  display: block; background: var(--ink-raise); padding: 1.05rem 1.3rem;
  text-decoration: none; color: var(--text); transition: background .18s ease;
}
.kb-related a:hover { background: var(--ink-tile); color: var(--rim); }
.kb-rel-k {
  display: block; font-family: var(--font-mono); font-size: .66rem;
  letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: .3rem;
}

/* cta */
.kb-cta {
  margin: 3.4rem 0 0; padding: 1.9rem; text-align: center;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: radial-gradient(120% 160% at 50% 0%, rgba(125,227,255,.09), transparent 60%), var(--ink-raise);
}
.kb-cta p { color: var(--text); margin: 0 0 1.15rem; font-size: 1rem; }

/* index cards */
.kb-cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.15rem; grid-template-columns: repeat(auto-fit, minmax(310px, 1fr)); }
.kb-card a {
  display: block; height: 100%; text-decoration: none;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--ink-raise); padding: 1.6rem 1.55rem 1.7rem;
  transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.kb-card a:hover { border-color: rgba(159,190,255,.32); background: var(--ink-tile); transform: translateY(-2px); }
.kb-card-k {
  font-family: var(--font-mono); font-size: .67rem; letter-spacing: .15em;
  text-transform: uppercase; color: var(--muted); margin: 0 0 .95rem;
  display: flex; justify-content: space-between; gap: 1rem;
}
.kb-card-t { color: rgba(143,161,199,.62); letter-spacing: .06em; }
.kb-card-h {
  font-family: var(--font-display); font-weight: 700; font-size: 1.2rem;
  line-height: 1.28; letter-spacing: -.012em; color: var(--rim);
  margin: 0 0 .7rem; text-wrap: balance;
}
.kb-card-d { font-size: .925rem; line-height: 1.6; color: var(--muted); margin: 0; }

.kb-article { padding: 7.2rem 0 6rem; }

@media (max-width: 620px) {
  .kb-article { padding-top: 5.4rem; }
  .kb-hero { padding: 6.2rem 0 2rem; }
  .kb-stats { grid-template-columns: 1fr; }
}