/* kn-wwa — component styles for the closed OBSERVER catalog (S2).
 *
 * One block per catalog component: page, header, nav, footer, hero, text,
 * tile_grid/tile, card, form/field/button, alert, empty_state, badge.
 */

/* --- page / reset --------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(1200px 480px at 50% -160px, var(--kn-paper), transparent 70%),
    var(--kn-ivory);
  color: var(--kn-ink);
  font-family: var(--kn-font-body);
  font-size: var(--kn-fs-body);
  line-height: var(--kn-lh);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--kn-font-display);
  font-weight: 600;
  line-height: var(--kn-lh-tight);
  letter-spacing: var(--kn-ls-tight);
  color: var(--kn-ink);
}

a { color: var(--kn-accent-strong); }

:focus-visible { outline: none; box-shadow: var(--kn-focus); border-radius: var(--kn-r-sm); }

/* --- header --------------------------------------------------------- */
.kn-header {
  background: linear-gradient(180deg, var(--kn-paper), rgba(255, 253, 248, 0.6));
  border-bottom: 1px solid var(--kn-line);
}
.kn-header__inner {
  max-width: var(--kn-max);
  margin: 0 auto;
  padding: var(--kn-s5) var(--kn-s4) var(--kn-s3);
}
.kn-header__brand {
  display: inline-block;
  font-family: var(--kn-font-display);
  font-size: 1.9rem;
  font-weight: 600;
  letter-spacing: var(--kn-ls-tight);
  color: var(--kn-ink);
  text-decoration: none;
}
.kn-header__brand::after {
  content: "";
  display: block;
  width: 2.6rem;
  height: 3px;
  margin-top: 0.45rem;
  background: var(--kn-accent);
  border-radius: 2px;
}
.kn-header__subtitle {
  margin: 0.7rem 0 0;
  color: var(--kn-muted);
  font-size: var(--kn-fs-small);
  letter-spacing: 0.02em;
}

/* --- nav ------------------------------------------------------------ */
.kn-nav {
  background: var(--kn-paper);
  border-bottom: 1px solid var(--kn-line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.kn-nav__inner {
  max-width: var(--kn-max);
  margin: 0 auto;
  padding: 0 var(--kn-s4);
  display: flex;
  align-items: center;
  gap: var(--kn-s2);
  min-height: 3rem;
  flex-wrap: wrap;
}
.kn-nav__link {
  display: inline-block;
  padding: 0.5rem 0.75rem;
  color: var(--kn-ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
  border-radius: var(--kn-r-sm);
  transition: color var(--kn-speed) var(--kn-ease), background var(--kn-speed) var(--kn-ease);
}
.kn-nav__link:hover { color: var(--kn-accent-strong); background: var(--kn-accent-soft); }
.kn-nav__logout { margin-left: auto; }

/* --- content column ------------------------------------------------- */
main,
.kn-hero, .kn-tiles, .kn-text, .kn-empty { width: 100%; }

.kn-content { max-width: var(--kn-max); margin: 0 auto; padding: 0 var(--kn-s4); }

/* --- hero ----------------------------------------------------------- */
.kn-hero {
  max-width: var(--kn-max);
  margin: 0 auto;
  padding: var(--kn-s6) var(--kn-s4) var(--kn-s4);
}
.kn-hero__title {
  margin: var(--kn-s2) 0 0;
  font-size: var(--kn-fs-hero);
}
.kn-hero__lead {
  margin: var(--kn-s3) 0 0;
  max-width: 42rem;
  color: var(--kn-ink-soft);
  font-size: 1.12rem;
}
.kn-hero__actions {
  margin-top: var(--kn-s4);
  display: flex;
  gap: var(--kn-s3);
  flex-wrap: wrap;
}

/* --- text ----------------------------------------------------------- */
.kn-text {
  max-width: var(--kn-max);
  margin: 0 auto var(--kn-s3);
  padding: 0 var(--kn-s4);
  color: var(--kn-ink-soft);
}

/* --- tiles ---------------------------------------------------------- */
.kn-tiles {
  max-width: var(--kn-max);
  margin: var(--kn-s4) auto var(--kn-s6);
  padding: 0 var(--kn-s4);
}
.kn-tiles__heading {
  margin: 0 0 var(--kn-s3);
  font-size: var(--kn-fs-h2);
}
.kn-tiles__grid {
  display: grid;
  gap: var(--kn-s3);
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}
.kn-tile {
  display: flex;
  flex-direction: column;
  gap: var(--kn-s2);
  padding: var(--kn-s4);
  background: var(--kn-paper);
  border: 1px solid var(--kn-line);
  border-radius: var(--kn-r-lg);
  box-shadow: var(--kn-shadow-sm);
  text-decoration: none;
  color: inherit;
  transition: transform var(--kn-speed) var(--kn-ease),
              border-color var(--kn-speed) var(--kn-ease),
              box-shadow var(--kn-speed) var(--kn-ease);
}
.kn-tile:hover {
  transform: translateY(-3px);
  border-color: var(--kn-line-strong);
  box-shadow: var(--kn-shadow);
}
.kn-tile__head { display: flex; align-items: baseline; gap: var(--kn-s2); flex-wrap: wrap; }
.kn-tile__title {
  font-family: var(--kn-font-display);
  font-size: var(--kn-fs-h3);
  font-weight: 600;
}
.kn-tile__body { margin: 0; color: var(--kn-muted); font-size: 0.96rem; }
.kn-tile--soon { border-style: dashed; background: linear-gradient(180deg, var(--kn-paper), var(--kn-ivory)); }

/* --- card ----------------------------------------------------------- */
.kn-card {
  max-width: 34rem;
  margin: var(--kn-s4) auto;
  padding: var(--kn-s5);
  background: var(--kn-paper);
  border: 1px solid var(--kn-line);
  border-radius: var(--kn-r-lg);
  box-shadow: var(--kn-shadow);
}
.kn-card__title { margin: 0 0 var(--kn-s2); font-size: var(--kn-fs-h2); }
.kn-card__body { margin: 0 0 var(--kn-s3); color: var(--kn-muted); }

/* --- form / field / button ----------------------------------------- */
.kn-form { display: flex; flex-direction: column; gap: var(--kn-s3); margin-top: var(--kn-s3); }
.kn-field { display: flex; flex-direction: column; gap: var(--kn-s1); }
.kn-field__label { font-size: var(--kn-fs-small); font-weight: 600; color: var(--kn-ink-soft); letter-spacing: 0.01em; }
.kn-field__input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  font: inherit;
  color: var(--kn-ink);
  background: var(--kn-paper);
  border: 1px solid var(--kn-line-strong);
  border-radius: var(--kn-r);
  transition: border-color var(--kn-speed) var(--kn-ease), box-shadow var(--kn-speed) var(--kn-ease);
}
.kn-field__input::placeholder { color: #a8ada6; }
.kn-field__input:focus { outline: none; border-color: var(--kn-accent); box-shadow: var(--kn-focus); }

.kn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--kn-s1);
  padding: 0.68rem 1.15rem;
  font: inherit;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--kn-r);
  cursor: pointer;
  transition: transform var(--kn-speed) var(--kn-ease),
              background var(--kn-speed) var(--kn-ease),
              border-color var(--kn-speed) var(--kn-ease);
}
.kn-btn:active { transform: translateY(1px); }
.kn-btn--primary { background: var(--kn-accent); color: #fff; box-shadow: var(--kn-shadow-sm); }
.kn-btn--primary:hover { background: var(--kn-accent-strong); }
.kn-btn--ghost { background: transparent; color: var(--kn-ink-soft); border-color: var(--kn-line-strong); }
.kn-btn--ghost:hover { color: var(--kn-accent-strong); border-color: var(--kn-accent); background: var(--kn-accent-soft); }
.kn-btn--sm { padding: 0.42rem 0.8rem; font-size: var(--kn-fs-small); }

/* --- alert ---------------------------------------------------------- */
.kn-alert {
  margin: 0 0 var(--kn-s3);
  padding: 0.7rem 0.9rem;
  border-radius: var(--kn-r);
  font-size: 0.94rem;
  border: 1px solid transparent;
}
.kn-alert--error { background: var(--kn-danger-soft); color: var(--kn-danger); border-color: #e6c7c1; }
.kn-alert--info  { background: var(--kn-info-soft); color: var(--kn-info); border-color: #c8d7e4; }
.kn-alert--success { background: var(--kn-accent-soft); color: var(--kn-accent-strong); border-color: #c4ddcd; }

/* --- empty state ---------------------------------------------------- */
.kn-empty {
  text-align: center;
  padding: var(--kn-s5) var(--kn-s3);
  color: var(--kn-ink-soft);
}
.kn-empty__title { margin: var(--kn-s2) 0 0; font-size: var(--kn-fs-h3); }
.kn-empty__body { margin: var(--kn-s2) auto 0; max-width: 30rem; color: var(--kn-muted); }

/* --- badge ---------------------------------------------------------- */
.kn-badge {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--kn-accent-strong);
  background: var(--kn-accent-soft);
  border-radius: 999px;
}
.kn-badge--soon { color: var(--kn-soon); background: var(--kn-soon-soft); }

/* --- footer --------------------------------------------------------- */
.kn-footer {
  margin-top: auto;
  border-top: 1px solid var(--kn-line);
  background: var(--kn-paper);
}
.kn-footer__inner {
  max-width: var(--kn-max);
  margin: 0 auto;
  padding: var(--kn-s4);
  display: flex;
  gap: var(--kn-s4);
  flex-wrap: wrap;
}
.kn-footer__line { margin: 0; color: var(--kn-muted); font-size: var(--kn-fs-small); }

@media (max-width: 40rem) {
  .kn-header__inner { padding-top: var(--kn-s4); }
  .kn-card { max-width: none; margin: var(--kn-s3) var(--kn-s3); padding: var(--kn-s4); }
}