/* Explain AI · glossary page.
 * Inherits chrome (nav, footer, wordmark, palette, fonts) from
 * marketing/brand.css. Only page-specific surfaces live here.
 */

/* ─── Hero ─── */
.explainai-hero {
  padding: clamp(64px, 9vw, 128px) var(--gutter) clamp(40px, 5vw, 64px);
  max-width: var(--grid-max);
  margin: 0 auto;
}
.explainai-hero .eyebrow { margin-bottom: clamp(32px, 5vw, 56px); }
.explainai-hero-title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(48px, 8vw, 120px);
  line-height: 0.95;
  letter-spacing: -0.038em;
  max-width: 14ch;
  margin-bottom: 32px;
}
.explainai-hero-title .signal { color: var(--signal); }
.explainai-hero-sub {
  font-family: var(--sans);
  font-weight: 400;
  font-size: clamp(17px, 1.5vw, 21px);
  line-height: 1.5;
  letter-spacing: -0.01em;
  max-width: 60ch;
  color: var(--bone);
  opacity: 0.82;
}

/* ─── Sticky filter bar ─── */
.explainai-controls {
  position: sticky;
  top: 53px;
  z-index: 40;
  background: var(--ink);
  border-top: 1px solid var(--hairline-dark);
  border-bottom: 1px solid var(--hairline-dark);
}
.explainai-controls-inner {
  max-width: var(--grid-max);
  margin: 0 auto;
  padding: clamp(16px, 1.8vw, 22px) var(--gutter);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.explainai-search {
  position: relative;
  display: flex;
  align-items: center;
}
.explainai-search .ico {
  position: absolute;
  left: 16px;
  font-family: var(--mono);
  font-size: 17px;
  color: var(--mute-dark);
  pointer-events: none;
  line-height: 1;
}
#explainai-search-input {
  width: 100%;
  background: rgba(242, 238, 229, 0.05);
  border: 1px solid var(--hairline-dark);
  border-radius: 2px;
  padding: 15px 46px 15px 44px;
  color: var(--bone);
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(16px, 1.5vw, 19px);
  letter-spacing: -0.01em;
  transition: border-color 0.15s, background 0.15s;
}
#explainai-search-input::placeholder { color: var(--mute-dark); font-weight: 400; }
#explainai-search-input:focus {
  outline: none;
  border-color: var(--signal);
  background: rgba(242, 238, 229, 0.08);
}
#explainai-clear {
  position: absolute;
  right: 10px;
  background: none;
  border: none;
  color: var(--mute-dark);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1;
  padding: 8px;
  display: none;
}
#explainai-clear:hover { color: var(--bone); }
#explainai-clear.show { display: block; }

.explainai-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.explainai-pills { display: flex; flex-wrap: wrap; gap: 8px; }
.explainai-pill {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute-dark);
  background: transparent;
  border: 1px solid var(--hairline-dark);
  padding: 8px 14px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.explainai-pill:hover { color: var(--bone); border-color: rgba(242, 238, 229, 0.4); }
.explainai-pill[aria-pressed="true"] {
  color: var(--ink);
  background: var(--bone);
  border-color: var(--bone);
}
.explainai-pill.signal-pill[aria-pressed="true"] {
  color: var(--bone);
  background: var(--signal);
  border-color: var(--signal);
}
.explainai-count {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute-dark);
  white-space: nowrap;
}
.explainai-count .signal { color: var(--signal); }

/* ─── Glossary ─── */
.explainai-glossary {
  padding: clamp(40px, 5vw, 72px) 0 clamp(64px, 7vw, 104px);
}
.explainai-cat {
  margin-bottom: clamp(48px, 6vw, 88px);
  scroll-margin-top: 160px;
}
.explainai-cat.hidden { display: none; }
.explainai-cat-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 20px;
  margin-bottom: 4px;
  border-bottom: 1.5px solid var(--signal);
}
.explainai-cat-title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
}
.explainai-cat-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute-dark);
}

.explainai-term {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: clamp(22px, 2.6vw, 32px) 0;
  border-bottom: 1px solid var(--hairline-dark);
}
@media (min-width: 760px) {
  .explainai-term {
    grid-template-columns: minmax(220px, 1fr) 2.4fr;
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }
}
.explainai-term.hidden { display: none; }
.explainai-term-name {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(20px, 2vw, 27px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--bone);
}
.explainai-term-abbr {
  display: block;
  margin-top: 6px;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mute-dark);
  text-transform: none;
}
.explainai-term-def {
  font-family: var(--sans);
  font-weight: 400;
  font-size: clamp(15px, 1.25vw, 17px);
  line-height: 1.55;
  color: var(--mute-dark);
  max-width: 62ch;
}
.explainai-term mark {
  background: rgba(230, 41, 61, 0.22);
  color: var(--bone);
  border-radius: 1px;
  padding: 0 1px;
}

.explainai-empty {
  display: none;
  text-align: center;
  padding: clamp(64px, 9vw, 128px) 0;
}
.explainai-empty.show { display: block; }
.explainai-empty .big {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 52px);
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}
.explainai-empty .big .signal { color: var(--signal); }
.explainai-empty p {
  font-family: var(--sans);
  color: var(--mute-dark);
  margin: 0 auto;
  max-width: 44ch;
}

/* ─── CTA strip ─── */
.explainai-cta {
  background: var(--bone);
  color: var(--ink);
}
.explainai-cta-inner {
  max-width: var(--grid-max);
  margin: 0 auto;
  padding: clamp(64px, 8vw, 120px) var(--gutter);
}
.explainai-cta .eyebrow { margin-bottom: 28px; }
.explainai-cta h2 {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(32px, 5vw, 72px);
  line-height: 0.98;
  letter-spacing: -0.035em;
  max-width: 18ch;
  margin-bottom: 24px;
}
.explainai-cta h2 .signal { color: var(--signal); }
.explainai-cta p {
  font-family: var(--sans);
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.5;
  color: var(--mute-light);
  max-width: 52ch;
  margin-bottom: 36px;
}
.explainai-cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.explainai-chat-agent {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  background: var(--signal);
  color: var(--bone);
  text-decoration: none;
  padding: 14px 20px 14px 14px;
  border-radius: 16px;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.explainai-chat-agent:hover {
  transform: translateY(-2px);
  background: #D51F33;
  box-shadow: 0 12px 34px rgba(230, 41, 61, 0.28);
}
.explainai-chat-agent .ca-avatar {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  background: var(--bone);
  color: var(--signal);
  font-family: var(--sans);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.03em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  line-height: 1;
}
.explainai-chat-agent .ca-text { display: flex; flex-direction: column; gap: 4px; }
.explainai-chat-agent .ca-title {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.012em;
  line-height: 1.1;
}
.explainai-chat-agent .ca-status {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1;
  color: rgba(242, 238, 229, 0.82);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.explainai-chat-agent .ca-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ADE80;
  box-shadow: 0 0 0 2px rgba(74, 222, 128, 0.25);
  flex-shrink: 0;
}
.explainai-chat-agent .ca-arrow {
  font-family: var(--mono);
  font-size: 16px;
  margin-left: 6px;
  transition: transform 0.15s;
}
.explainai-chat-agent:hover .ca-arrow { transform: translateX(3px); }

@media (prefers-reduced-motion: reduce) {
  .explainai-chat-agent,
  .explainai-pill,
  #explainai-search-input,
  #explainai-clear {
    transition: none;
  }
}