/* ============================================================
   Tektome — Knowledge Center page (knowledge-center.html)
   Sections: hero · split (featured + lists) · FAQ · CTA
   Light mode only. Tokens from colors_and_type.css.
   ============================================================ */

/* ── Hero ───────────────────────────────────────────────────── */
.kc-hero {
  background: var(--color-draft-white);
  padding: 80px 24px 72px;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle, #EAEAEA);
}
.kc-hero__inner {
  max-width: 640px;
  margin: 0 auto;
}
.kc-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: var(--fw-medium);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-arch-purple);
  margin: 0 0 20px;
}
.kc-hero__title {
  font-family: var(--font-display);
  font-weight: var(--fw-light);
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-data-black);
  margin: 0 0 20px;
}
.kc-hero__lede {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--fg-secondary);
  margin: 0;
  text-wrap: pretty;
}

/* ── Split section ──────────────────────────────────────────── */
.kc-split {
  background: var(--color-draft-white);
  padding: 72px 0 88px;
}
.kc-split__inner {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

/* Section label (共通) */
.kc-section-label {
  font-family: var(--font-sans);
  font-weight: var(--fw-semibold);
  font-size: 22px;
  color: var(--color-arch-purple);
  margin: 0 0 24px;
  letter-spacing: -0.01em;
}
.kc-section-label--sm {
  font-size: 18px;
  margin-bottom: 16px;
}

/* ── Featured article (left) ────────────────────────────────── */
.kc-featured__image {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none;
  background: var(--purple-50, #ECECFC);
  position: relative;
  margin-bottom: 20px;
}
.kc-featured__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-arch-purple), #8A8DE8);
}
.kc-featured__placeholder img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.kc-featured__mark {
  width: 48px;
  height: 48px;
  opacity: 0.2;
}
.kc-featured__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.kc-featured__body {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.kc-featured__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
}
.kc-pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: var(--fw-medium);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.kc-pill--news { background: var(--purple-100, #E1E0FA); color: var(--color-arch-purple); }
.kc-pill--blog { background: var(--color-sky-100, #DCEEFF); color: #1F5FAA; }
.kc-featured__title {
  font-family: var(--font-sans);
  font-weight: var(--fw-semibold);
  font-size: 18px;
  line-height: 1.4;
  color: var(--color-data-black);
  margin: 0;
}
.kc-featured__title a {
  color: inherit;
  text-decoration: none;
  transition: color 120ms;
}
.kc-featured__title a:hover { color: var(--color-arch-purple); }
.kc-featured__excerpt {
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-secondary);
  margin: 0;
  text-wrap: pretty;
}
.kc-featured__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: var(--fw-semibold);
  color: var(--color-arch-purple);
  text-decoration: none;
  transition: color 120ms;
}
.kc-featured__link svg { width: 14px; height: 14px; transition: transform 120ms; }
.kc-featured__link:hover { color: var(--purple-700); }
.kc-featured__link:hover svg { transform: translateX(3px); }

/* ── Article lists (right) ──────────────────────────────────── */
.kc-right {
  display: flex;
  flex-direction: column;
  gap: 48px;
}
.kc-article-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.kc-article-item {
  border-top: 1px solid var(--border-subtle, #EAEAEA);
  padding: 14px 0;
}
.kc-article-item:last-child { border-bottom: 1px solid var(--border-subtle, #EAEAEA); }
.kc-article-link {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.55;
  color: var(--color-data-black);
  text-decoration: none;
  display: block;
  transition: color 120ms;
  text-wrap: pretty;
}
.kc-article-link:hover { color: var(--color-arch-purple); }
.kc-list-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 14px;
  font-weight: var(--fw-semibold);
  color: var(--color-arch-purple);
  text-decoration: none;
  transition: color 120ms;
}
.kc-list-more svg { width: 14px; height: 14px; transition: transform 120ms; }
.kc-list-more:hover { color: var(--purple-700); }
.kc-list-more:hover svg { transform: translateX(3px); }

/* ── FAQ ─────────────────────────────────────────────────────── */
.kc-faq {
  background: var(--bg-section-alt, #E8EFFC);
  padding: 80px 0 88px;
}
.kc-faq__inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 40px;
}
.kc-faq__header { text-align: center; margin-bottom: 48px; }
.kc-faq__title {
  font-family: var(--font-display);
  font-weight: var(--fw-light);
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.02em;
  color: var(--color-data-black);
  margin: 0;
}
.kc-faq__list {
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.kc-faq__item { border-top: 1px solid var(--border-subtle, #D4D4D4); }
.kc-faq__item:last-child { border-bottom: 1px solid var(--border-subtle, #D4D4D4); }

.kc-accordion { }
.kc-accordion__summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 4px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: var(--fw-medium);
  color: var(--color-data-black);
  cursor: pointer;
  list-style: none;
  transition: color 120ms;
}
.kc-accordion__summary::-webkit-details-marker { display: none; }
.kc-accordion__summary:hover { color: var(--color-arch-purple); }
.kc-accordion__icon {
  flex: 0 0 20px;
  width: 20px;
  height: 20px;
  color: var(--fg-secondary);
  transition: transform 200ms var(--ease-out);
}
.kc-accordion[open] .kc-accordion__icon { transform: rotate(180deg); }
.kc-accordion__body {
  padding: 0 4px 20px;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg-secondary);
}
.kc-accordion__body p { margin: 0; text-wrap: pretty; }

.kc-faq__more {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: var(--fw-semibold);
  color: var(--color-arch-purple);
  text-decoration: none;
  transition: color 120ms;
}
.kc-faq__more svg { width: 14px; height: 14px; transition: transform 120ms; }
.kc-faq__more:hover { color: var(--purple-700); }
.kc-faq__more:hover svg { transform: translateX(3px); }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .kc-split__inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .kc-right { gap: 40px; }
}
@media (max-width: 600px) {
  .kc-split { padding: 48px 0 64px; }
  .kc-split__inner { padding: 0 20px; }
  .kc-faq__inner { padding: 0 20px; }
  .kc-hero { padding: 56px 20px 48px; }
}