/* layout.css — header, footer, grids */

/* ---- Header ---- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(251,250,255,.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; height: 72px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand:hover { color: var(--c-ink); }
.brand-mark { width: 40px; height: 40px; flex: 0 0 auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-name { font-family: var(--font-head); font-weight: 800; font-size: 1.12rem; color: var(--c-ink); letter-spacing: -.02em; }
.brand-tag { font-size: .72rem; color: var(--c-ink-soft); letter-spacing: .04em; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  font-family: var(--font-head); font-weight: 600; font-size: .94rem;
  color: var(--c-ink-soft); padding: 9px 13px; border-radius: 10px;
  transition: background .2s, color .2s;
}
.nav a:hover { color: var(--c-grape-d); background: rgba(108,76,241,.08); }
.nav a.is-active { color: var(--c-grape-d); background: rgba(108,76,241,.12); }

.nav-toggle {
  display: none; width: 44px; height: 44px; border: 1px solid var(--c-line);
  background: var(--c-card); border-radius: 12px; cursor: pointer;
  align-items: center; justify-content: center; flex-direction: column; gap: 4px;
}
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--c-ink); border-radius: 2px; transition: transform .25s, opacity .2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed; inset: 72px 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    background: var(--c-bg); padding: 16px var(--space) 24px;
    border-bottom: 1px solid var(--c-line);
    box-shadow: var(--shadow-m);
    transform: translateY(-130%); transition: transform .3s ease;
  }
  .nav.is-open { transform: translateY(0); }
  .nav a { padding: 13px 14px; font-size: 1.02rem; }
}

/* ---- Footer ---- */
.site-footer {
  background: #12102a; color: #cfc9ec;
  padding: clamp(48px, 7vw, 80px) 0 28px;
  margin-top: 40px;
}
.footer-grid {
  display: grid; gap: 36px;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
}
.site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: 14px; }
.site-footer a { color: #cfc9ec; }
.site-footer a:hover { color: var(--c-amber); }
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-tag { color: #908ab8; }
.footer-about { margin-top: 14px; max-width: 34ch; color: #a9a3d0; font-size: .95rem; }
.footer-list { list-style: none; padding: 0; }
.footer-list li { margin: 0 0 9px; }
.footer-social { display: flex; gap: 10px; margin-top: 16px; }
.footer-social a {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(255,255,255,.06); transition: background .2s, transform .2s;
}
.footer-social a:hover { background: var(--grad-warm); transform: translateY(-3px); }
.footer-social svg { width: 18px; height: 18px; fill: #fff; }
.footer-bottom {
  margin-top: 40px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.10);
  display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; align-items: center;
  font-size: .86rem; color: #908ab8;
}
.footer-bottom nav { display: flex; gap: 18px; flex-wrap: wrap; }

@media (max-width: 820px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---- Generic grids ---- */
.bento {
  display: grid; gap: 18px;
  grid-template-columns: repeat(6, 1fr);
}
.bento > * { min-width: 0; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.row-2 { grid-row: span 2; }

@media (max-width: 860px) {
  .bento { grid-template-columns: repeat(2, 1fr); }
  .col-2, .col-3, .col-4, .col-6 { grid-column: span 2; }
  .row-2 { grid-row: auto; }
}
@media (max-width: 520px) {
  .bento { grid-template-columns: 1fr; }
  .col-2, .col-3, .col-4, .col-6 { grid-column: 1 / -1; }
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 4vw, 48px); align-items: center; }
@media (max-width: 760px) { .grid-2 { grid-template-columns: 1fr; } }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
@media (max-width: 820px) { .grid-3 { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 520px) { .grid-3 { grid-template-columns: 1fr; } }