/* ===========================================
   ZenRead Academic · About Page Styles
=========================================== */

.container--wide { max-width: var(--container-wide); }
.container--narrow { max-width: var(--container-narrow); }

/* — Section Label / Title ———————————————─ */
.section-label {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary-300);
  margin-bottom: var(--space-sm);
}
.section-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  max-width: 720px;
}

/* — About Hero ————————————————————— */
.about-hero {
  padding: var(--space-4xl) 0 var(--space-3xl);
  background:
    radial-gradient(ellipse 80% 60% at 10% 20%, rgba(34, 114, 229, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 80%, rgba(124, 92, 219, 0.06) 0%, transparent 55%),
    var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
}
.about-hero .container {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--space-3xl);
  align-items: center;
}
.about-hero__content { max-width: 640px; }
.about-hero__kicker {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary-500);
  margin-bottom: var(--space-md);
  padding: 6px 14px;
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-100);
  border-radius: var(--radius-full);
}
.about-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 4.5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}
.about-hero__text {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  max-width: 56ch;
}
.about-hero__visual { display: flex; align-items: center; justify-content: center; }
.about-hero__visual svg { width: 100%; max-width: 460px; height: auto; }

/* — Stats ———————————————————————─ */
.stats-section {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-surface);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  text-align: center;
}
.stat-item { display: flex; flex-direction: column; align-items: center; gap: var(--space-2xs); }
.stat-item__number {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-primary-600);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}
.stat-item__label {
  font-family: var(--font-ui);
  font-size: clamp(0.8125rem, 1.4vw, 0.9375rem);
  color: var(--color-text-secondary);
}

/* — Mission ——————————————————————─ */
.mission-section {
  padding: var(--space-3xl) 0;
}
.mission-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}
.mission-card {
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
}
.mission-card__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-50);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  color: var(--color-primary-500);
}
.mission-card__icon svg { width: 22px; height: 22px; }
.mission-card h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}
.mission-card p {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

/* — Features —————————————————————— */
.features-section {
  padding: var(--space-2xl) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.feature-card {
  padding: var(--space-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.feature-card:hover { border-color: var(--color-primary-100); box-shadow: var(--shadow-sm); }
.feature-card__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-50);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  color: var(--color-primary-500);
}
.feature-card__icon svg { width: 22px; height: 22px; }
.feature-card h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}
.feature-card p {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

/* — Team ———————————————————————— */
.team-section {
  padding: var(--space-3xl) 0;
}
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}
.team-card {
  text-align: center;
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
}
.team-card__avatar {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background: var(--color-primary-50);
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-500);
}
.team-card__avatar svg { width: 32px; height: 32px; }
.team-card h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2xs);
}
.team-card span {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

/* — Partners —————————————————————— */
.partner-section {
  padding: var(--space-2xl) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
}
.partner-section .section-label { text-align: center; }
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-2xl);
}
.partner-wall__item {
  height: 36px;
  opacity: 0.5;
  filter: grayscale(100%);
  transition: opacity var(--transition-base), filter var(--transition-base);
}
.partner-wall__item:hover { opacity: 1; filter: grayscale(0%); }

/* — Contact ——————————————————————─ */
.contact-section {
  padding: var(--space-3xl) 0;
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.contact-card {
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  text-align: center;
}
.contact-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-50);
  border-radius: var(--radius-md);
  margin: 0 auto var(--space-md);
  color: var(--color-primary-500);
}
.contact-card__icon svg { width: 24px; height: 24px; }
.contact-card h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}
.contact-card p {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

/* — Responsive ————————————————————— */
@media (max-width: 1023px) {
  .about-hero .container { grid-template-columns: 1fr; gap: var(--space-2xl); }
  .about-hero__visual { display: none; }
  .mission-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 639px) {
  .about-hero { padding: var(--space-2xl) 0; }
  .about-hero__title { font-size: 1.75rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item__number { font-size: clamp(1.625rem, 7.5vw, 2.25rem); }
  .stat-item__label { font-size: 0.8125rem; }
  .features-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}