/* =====================================================================
   KNOWLEDGE DATABASE — search + results layout
   Inherits typography, color tokens, and nav from styles.css.
   This file only adds page-specific layout (hero, search bar, results).
   ===================================================================== */

body.is-knowledge{
  background: #04050a;
  color: var(--ink, #e7e9ee);
}

/* ---------- HERO ---------- */
.kn-hero{
  position: relative;
  padding: clamp(140px, 18vh, 200px) var(--pad-x) clamp(40px, 6vh, 70px);
  background: linear-gradient(180deg, #050608 0%, #08090e 100%);
  overflow: hidden;
}
.kn-hero::before{
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(180,200,230,.08), transparent 55%);
  pointer-events: none;
}
.kn-hero__inner{
  position: relative;
  max-width: var(--max, 1280px);
  margin: 0 auto;
  display: grid;
  gap: 18px;
  z-index: 1;
}
.kn-hero__title{
  font-family: var(--ff-display);
  font-weight: 200;
  font-size: clamp(34px, 5.6vw, 78px);
  line-height: 1.04;
  letter-spacing: -.022em;
  color: var(--platinum, #f0f3f8);
  margin: 0;
  max-width: 22ch;
}
.kn-hero__lede{
  font-size: clamp(15px, 1.15vw, 19px);
  color: var(--ink-soft, #b8bcc4);
  max-width: 70ch;
  margin: 0;
  font-family: var(--ff-serif);
  font-style: italic;
  line-height: 1.55;
}

/* ---------- SEARCH ---------- */
.kn-search{
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(4,5,10,.85);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-top: 1px solid rgba(220,225,235,.06);
  border-bottom: 1px solid rgba(220,225,235,.06);
  padding: clamp(20px, 3vh, 32px) var(--pad-x);
}
.kn-search__inner{
  max-width: var(--max, 1280px);
  margin: 0 auto;
  display: grid;
  gap: 18px;
}
.kn-search__form{
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.kn-search__field{
  flex: 1 1 320px;
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(220,225,235,.16);
  border-radius: 999px;
  transition: border-color .25s ease, background .25s ease;
}
.kn-search__field:focus-within{
  border-color: rgba(255,255,255,.5);
  background: rgba(255,255,255,.10);
}
.kn-search__icon{
  font-style: normal;
  font-size: 18px;
  color: var(--silver, #c9ced6);
  line-height: 1;
}
.kn-search__field input{
  flex: 1;
  background: transparent;
  border: 0;
  outline: 0;
  color: #fff;
  font-size: 15px;
  font-family: inherit;
  letter-spacing: .005em;
}
.kn-search__field input::placeholder{
  color: rgba(220,225,235,.45);
}
.kn-search__count{
  font-family: var(--ff-mono, monospace);
  font-size: 11px;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--silver-2, #8a8f97);
  white-space: nowrap;
}
.kn-filters{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.kn-filter{
  appearance: none;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(220,225,235,.14);
  color: var(--silver, #c9ced6);
  font-family: inherit;
  font-size: 11px;
  letter-spacing: .25em;
  text-transform: uppercase;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .25s ease, border-color .25s ease, color .25s ease;
}
.kn-filter:hover{
  border-color: rgba(255,255,255,.45);
  color: #fff;
}
.kn-filter.is-active{
  background: rgba(255,255,255,.16);
  border-color: rgba(255,255,255,.6);
  color: #fff;
}

/* ---------- RESULTS ---------- */
.kn-results{
  padding: clamp(40px, 6vh, 80px) var(--pad-x) clamp(80px, 12vh, 140px);
}
.kn-results__inner{
  max-width: var(--max, 1280px);
  margin: 0 auto;
}
.kn-results__list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: clamp(16px, 2vw, 24px);
}
.kn-results__empty{
  margin: 0;
  text-align: center;
  font-style: italic;
  color: var(--ink-soft, #b8bcc4);
  padding: 80px 0;
}

.kn-card{
  position: relative;
  display: grid;
  gap: 12px;
  padding: clamp(20px, 2vw, 28px);
  background: linear-gradient(180deg, rgba(20,24,32,.55) 0%, rgba(10,12,16,.7) 100%);
  border: 1px solid rgba(220,225,235,.10);
  border-radius: 18px;
  transition: border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.kn-card:hover{
  border-color: rgba(220,225,235,.30);
  transform: translateY(-3px);
  box-shadow: 0 24px 48px rgba(0,0,0,.4);
}
.kn-card__top{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--ff-mono, monospace);
  font-size: 10px;
  letter-spacing: .25em;
  text-transform: uppercase;
  color: var(--silver-2, #8a8f97);
}
.kn-card__type{
  padding: 4px 10px;
  border: 1px solid rgba(220,225,235,.30);
  border-radius: 999px;
  color: var(--silver, #c9ced6);
}
.kn-card__date{ color: var(--silver-2); }
.kn-card__title{
  font-family: var(--ff-display);
  font-weight: 300;
  font-size: clamp(18px, 1.4vw, 22px);
  letter-spacing: -.012em;
  line-height: 1.2;
  color: var(--platinum, #f0f3f8);
  margin: 0;
}
.kn-card__summary{
  font-size: 14px;
  color: var(--ink-soft, #b8bcc4);
  margin: 0;
  line-height: 1.6;
}
.kn-card__meta{
  display: grid;
  gap: 4px;
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px solid rgba(220,225,235,.08);
  font-size: 12px;
  color: var(--silver, #c9ced6);
}
.kn-card__author{
  font-family: var(--ff-mono, monospace);
  letter-spacing: .04em;
}
.kn-card__species i{
  font-style: italic;
  font-family: var(--ff-serif);
  color: var(--ink-soft, #b8bcc4);
}
.kn-card__tags{
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.kn-card__tag{
  font-family: var(--ff-mono, monospace);
  font-size: 10px;
  letter-spacing: .15em;
  color: var(--silver-2, #8a8f97);
  padding: 3px 8px;
  background: rgba(220,225,235,.04);
  border-radius: 999px;
}

/* ---------- NAV current-link state ---------- */
.nav__links a.is-current{
  color: #fff;
}
.nav__links a.is-current::after{
  right: 0;
}

@media (max-width: 700px){
  .kn-results__list{ grid-template-columns: 1fr; }
  .kn-search__form{ gap: 12px; }
  .kn-search__count{ font-size: 10px; }
}

@media (prefers-reduced-motion: reduce){
  .kn-card{ transition: none; }
}