/* ============================================================
   responsive.css — Hipponylab Homepage
   Media queries: tablet (≤900px) and mobile (≤600px)
   ============================================================ */

/* ── Tablet (≤ 900px) ──────────────────────────────────────── */
@media (max-width: 900px) {

  /* Nav */
  .nav__links {
    gap: var(--space-md);
  }

  .nav__link {
    font-size: 0.82rem;
  }

  /* Hero */
  .hero__logo {
    height: 76px;
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-photo {
    max-width: 400px;
  }

  /* News */
  .news-grid {
    grid-template-columns: 1fr;
  }

  /* Funding */
  .funding-grid {
    grid-template-columns: 1fr;
  }

  /* Tools */
  .tool-card {
    grid-template-columns: 160px 1fr;
    height: 160px;
  }

  /* Footer */
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .footer__brand {
    grid-column: 1 / -1;
  }
}

/* ── Mobile (≤ 600px) ──────────────────────────────────────── */
@media (max-width: 600px) {

  :root {
    --space-xl: 3rem;
    --space-2xl: 4rem;
  }

  /* Nav — hamburger */
  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-md);
    box-shadow: var(--shadow-md);
  }

  .nav--open .nav__links {
    display: flex;
  }

  .nav__toggle {
    display: flex;
  }

  .nav__site-name {
    font-size: 0.95rem;
  }

  /* Hero */
  .hero {
    padding: 2.5rem 0 2rem;
  }

  .hero__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .hero__logo {
    height: 64px;
  }

  .hero__lab-name {
    font-size: 1.75rem;
  }

  /* About */
  .about-photo {
    max-width: 100%;
  }

  /* News */
  .news-grid {
    grid-template-columns: 1fr;
  }

  /* Funding */
  .funding-card {
    grid-template-columns: 1fr;
  }

  .funding-card__badge {
    width: 44px;
    height: 44px;
    font-size: 0.65rem;
  }

  /* Paper cards */
  .paper-card {
    grid-template-columns: 1fr;
  }

  .paper-card__image-wrap {
    width: 100%;
  }

  .paper-card__image,
  .paper-card__image-placeholder {
    width: 100%;
    min-height: 160px;
    height: 160px;
  }

  /* Tools */
  .tool-card {
    grid-template-columns: 120px 1fr;
    height: 140px;
  }

  /* Footer */
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  /* Focus chips */
  .focus-chips {
    gap: 0.4rem;
  }

  .focus-chip {
    font-size: 0.8rem;
  }

  /* Filter bar */
  .filter-btn {
    font-size: 0.8rem;
    padding: 0.35rem 0.85rem;
  }

  /* Section spacing */
  .container {
    padding: 0 var(--space-md);
  }
}

/* ── Small mobile (≤ 400px) ────────────────────────────────── */
@media (max-width: 400px) {

  .hero__lab-name {
    font-size: 1.5rem;
  }

  .paper-card__actions {
    flex-direction: column;
    align-items: flex-start;
  }
}