/* ====================================
   ChinaGraph 2026 - 响应式样式
   ==================================== */

/* ---- Large Desktop (>= 1280px) ---- */
@media (min-width: 1280px) {
  .hero {
    min-height: 600px;
  }
}

/* ---- Tablet Landscape (< 1024px) ---- */
@media (max-width: 1023px) {
  .header__inner {
    display: flex;
    justify-content: space-between;
    position: static;
  }

  .header__brand {
    position: static;
    transform: none;
  }

  .nav {
    display: none;
    position: static;
    transform: none;
    max-width: none;
    min-width: unset;
    overflow: visible;
  }

  .nav-toggle {
    display: flex;
    position: static;
    transform: none;
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
  }

  .keynote-card {
    flex-direction: column;
  }

  .keynote-card__photo-wrap {
    width: 100%;
    display: flex;
    justify-content: center;
  }

  .keynote-card__photo {
    width: 160px;
    height: 200px;
  }
}

/* ---- Tablet Portrait (< 768px) ---- */
@media (max-width: 767px) {
  :root {
    --space-2xl: 48px;
    --space-3xl: 64px;
    --text-4xl: 2.2rem;
    --text-3xl: 1.8rem;
    --text-2xl: 1.5rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .hero {
    min-height: 450px;
  }

  .hero__info {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .hero__actions .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .person-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

  .person-card {
    padding: var(--space-md);
  }

  .person-card__photo {
    width: 80px;
    height: 80px;
  }

  .history-list {
    grid-template-columns: 1fr;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer__links {
    align-items: center;
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .pc-list {
    column-count: 2;
  }

  .program-tabs {
    gap: var(--space-xs);
  }

  .program-tab {
    padding: 8px 16px;
    font-size: var(--text-xs);
  }

  .event-card {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .event-card__time {
    min-width: unset;
  }

  .hotel-grid {
    grid-template-columns: 1fr;
  }

  .fee-table th,
  .fee-table td {
    padding: 10px var(--space-md);
    font-size: var(--text-sm);
  }

  .timeline {
    padding-left: 30px;
  }

  .timeline::before {
    left: 10px;
  }

  .timeline__dot {
    left: -28px;
    width: 16px;
    height: 16px;
  }
}

/* ---- Mobile (< 480px) ---- */
@media (max-width: 479px) {
  :root {
    --text-4xl: 1.8rem;
    --text-3xl: 1.5rem;
    --header-height: 60px;
  }

  .header__brand-text .zh {
    font-size: 0.85rem;
  }

  .header__brand-text .en {
    display: none;
  }

  .hero__edition {
    font-size: var(--text-xs);
    padding: 2px var(--space-md);
  }

  .person-grid {
    grid-template-columns: 1fr;
  }

  .announcement-card {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .announcement-card__date {
    display: flex;
    gap: var(--space-sm);
    align-items: baseline;
  }

  .pc-list {
    column-count: 1;
  }

  .sponsors-grid {
    gap: var(--space-md);
  }

  .sponsor-card {
    min-width: 140px;
    padding: var(--space-md);
  }

  .content-card {
    padding: var(--space-lg);
  }

  .section-title {
    font-size: var(--text-xl);
  }

  .page-banner__title {
    font-size: var(--text-2xl);
  }
}