/* ============================================================
   CogniHuman — Home Page Styles
   ============================================================ */

/* --- Hero --- */
.hero {
  padding-top: calc(var(--nav-h) + var(--sp-20));
  padding-bottom: var(--sp-24);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(ellipse at center,
    rgba(61,107,74,0.07) 0%,
    rgba(61,107,74,0.02) 50%,
    transparent 70%
  );
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: -100px;
  width: 500px;
  height: 400px;
  background: radial-gradient(ellipse at center,
    rgba(181,69,27,0.04) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ch-ink-500);
  background: var(--ch-ink-50);
  border: 1px solid var(--ch-ink-200);
  padding: 0.3125rem 0.875rem;
  border-radius: 100px;
  margin-bottom: var(--sp-8);
  width: fit-content;
}

.hero__badge-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ch-terra-500);
}

.hero__headline {
  margin-bottom: var(--sp-6);
  max-width: 820px;
}

.hero__headline em {
  font-style: italic;
  color: var(--ch-ink-500);
}

.hero__sub {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--text-secondary);
  font-weight: 300;
  max-width: 560px;
  margin-bottom: var(--sp-10);
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  flex-wrap: wrap;
}

.hero__note {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: var(--sp-4);
}

/* --- Stat strip --- */
.stat-strip {
  padding-block: var(--sp-12);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.stat-strip__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-8);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.stat__number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1;
}

.stat__label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 300;
}

/* --- Mission section --- */
.mission__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-16);
  align-items: start;
}

.mission__left { }

.mission__right {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}

.mission-item {
  display: flex;
  gap: var(--sp-4);
  padding: var(--sp-5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  transition: border-color var(--dur-mid) ease, background var(--dur-mid) ease;
}

.mission-item:hover {
  border-color: var(--ch-ink-200);
  background: var(--ch-ink-50);
}

.mission-item__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--ch-ink-100);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--ch-ink-600);
}

.mission-item__icon svg { width: 18px; height: 18px; }

.mission-item__title {
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: var(--sp-1);
  color: var(--text-primary);
}

.mission-item__desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 100%;
}

/* --- Research section --- */
.research__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
  margin-top: var(--sp-8);
}

.research-card {
  padding: var(--sp-8);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.research-card__status {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.research-card__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.research-card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--text-primary);
}

.research-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
  max-width: 100%;
}

.research-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: auto;
}

.research-card__link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--ch-ink-500);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  margin-top: var(--sp-2);
  transition: gap var(--dur-fast) ease, color var(--dur-fast) ease;
}
.research-card__link:hover { gap: var(--sp-3); color: var(--ch-ink-700); }
.research-card__link svg { width: 14px; height: 14px; }

/* --- Philosophy banner --- */
.philosophy {
  background: var(--ch-ink-900);
  color: var(--ch-paper-100);
  padding-block: var(--sp-20);
  position: relative;
  overflow: hidden;
}

.philosophy::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(61,107,74,0.18) 0%, transparent 70%);
  pointer-events: none;
}

.philosophy__inner { position: relative; z-index: 1; }

.philosophy__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(237,229,212,0.4);
  margin-bottom: var(--sp-6);
}

.philosophy__quote {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 400;
  font-style: italic;
  line-height: 1.45;
  color: var(--ch-paper-100);
  max-width: 820px;
  margin-bottom: var(--sp-8);
}

.philosophy__principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
  margin-top: var(--sp-12);
  padding-top: var(--sp-12);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.principle {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.principle__mark {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ch-ink-400);
  letter-spacing: 0.06em;
  margin-bottom: var(--sp-2);
}

.principle__title {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  color: var(--ch-paper-100);
}

.principle__desc {
  font-size: 0.875rem;
  color: rgba(237,229,212,0.55);
  line-height: 1.65;
  font-weight: 300;
  max-width: 100%;
}

/* --- Blog / News section --- */
.news__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
  margin-top: var(--sp-8);
}

.news-card {
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.news-card__date {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

.news-card__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--text-primary);
  flex: 1;
}

.news-card__excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 100%;
}

.news-card__type {
  margin-top: auto;
}

/* --- CTA / Join section --- */
.join-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding-block: var(--sp-20);
}

.join-section__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-16);
  align-items: center;
}

.join-section__ways {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.way-item {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-4);
  padding: var(--sp-4);
  border-radius: var(--radius-md);
  transition: background var(--dur-fast) ease;
}

.way-item:hover { background: var(--ch-ink-50); }

.way-item__icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--ch-ink-100);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--ch-ink-600);
}
.way-item__icon svg { width: 16px; height: 16px; }
.way-item__title { font-size: 0.9375rem; font-weight: 500; color: var(--text-primary); }
.way-item__desc { font-size: 0.8125rem; color: var(--text-muted); line-height: 1.5; max-width: 100%; }

/* --- Responsive --- */
@media (max-width: 900px) {
  .research__grid { grid-template-columns: 1fr 1fr; }
  .philosophy__principles { grid-template-columns: 1fr 1fr; }
  .news__grid { grid-template-columns: 1fr 1fr; }
  .stat-strip__grid { grid-template-columns: 1fr 1fr; gap: var(--sp-8) var(--sp-6); }
  .mission__grid { grid-template-columns: 1fr; gap: var(--sp-12); }
  .join-section__inner { grid-template-columns: 1fr; gap: var(--sp-12); }
}

@media (max-width: 600px) {
  .research__grid { grid-template-columns: 1fr; }
  .philosophy__principles { grid-template-columns: 1fr; }
  .news__grid { grid-template-columns: 1fr; }
  .hero__actions { flex-direction: column; align-items: flex-start; }
}