/*
 * Mobile nav (hamburger) + collection prev/next
 * Load this AFTER each page's <style> block so it wins over
 * local @media (max-width: 760px) mast rules.
 */

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  margin-left: auto;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--fog, #d9d2e2);
  cursor: pointer;
  z-index: 50;
}

.nav-toggle:focus-visible {
  outline: 1px solid var(--violet-light, #c3aaf5);
  outline-offset: 3px;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 1.15rem;
  height: 1px;
  background: currentColor;
  position: relative;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.mast.is-nav-open .nav-toggle__bars {
  background: transparent;
}
.mast.is-nav-open .nav-toggle__bars::before {
  top: 0;
  transform: rotate(45deg);
}
.mast.is-nav-open .nav-toggle__bars::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (max-width: 900px) {
  html {
    scroll-padding-top: 4.75rem;
  }

  /* In-page jumps (教育 / 摄影…) clear the sticky mast */
  #cv-top,
  #education,
  #experience,
  #publications,
  #collaborations,
  #skills,
  #research-top,
  #visual,
  #daily,
  #painting-top,
  #early-top,
  #installation-top,
  #secret-garden,
  #tears,
  #heat,
  #soliloquy,
  #copper,
  #ember,
  #lattice,
  #echo,
  #tianyuan-difang,
  #cai-xian-yu-qi,
  #yi-ju-jian-guang,
  #press {
    scroll-margin-top: 4.75rem;
  }

  .mast {
    position: sticky;
    top: 0;
    z-index: 40;
    flex-direction: row !important;
    flex-wrap: wrap;
    align-items: center !important;
    padding-top: 0.15rem;
    padding-bottom: 0.15rem;
    background: transparent;
  }

  /* Inner pages only — never tint the homepage hero cover */
  .shell > .mast {
    background: rgba(16, 10, 20, 0.94);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
  }

  /* Homepage cover: keep chrome clear over the photo */
  .overlay > .mast {
    position: relative;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .nav-toggle {
    display: flex;
  }

  .top-nav {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start !important;
    gap: 0.95rem !important;
    margin-top: 0.85rem;
    padding: 1.15rem 1.2rem 1.5rem;
    background: rgba(16, 10, 20, 0.94);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    max-height: min(78vh, 40rem);
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }

  .mast.is-nav-open .top-nav {
    display: flex;
  }

  .nav-item {
    width: 100%;
  }

  .top-nav > .nav-item > a,
  .top-nav > .nav-item > .nav-label {
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    min-height: 2rem;
  }

  /* Expandable sections: same destinations as desktop, tap to open */
  .top-nav > .nav-item:has(> .dropdown) > .nav-label::after {
    content: "";
    position: static;
    left: auto;
    bottom: auto;
    width: 0.35rem;
    height: 0.35rem;
    margin-left: 0.15rem;
    border-right: 1px solid currentColor;
    border-bottom: 1px solid currentColor;
    background: none;
    transform: rotate(45deg);
    opacity: 0.65;
    transition: transform 0.2s ease;
  }

  .top-nav > .nav-item.is-expanded > .nav-label::after {
    transform: rotate(-135deg);
    opacity: 1;
  }

  /* Accordion: submenus collapsed until .is-expanded (see site-ui.js).
     Desktop (>900px) keeps hover dropdowns — do not change those rules. */
  .top-nav .dropdown,
  .top-nav .dd-flyout-menu {
    position: static !important;
    left: auto !important;
    top: auto !important;
    transform: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    display: none !important;
    flex-direction: column;
    align-items: flex-start !important;
    gap: 0.55rem;
    width: 100%;
    min-width: 0 !important;
    max-height: none !important;
    margin: 0.45rem 0 0.15rem;
    padding: 0 0 0.2rem 0.85rem;
    background: transparent !important;
    box-shadow: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }

  .top-nav .nav-item.is-expanded > .dropdown {
    display: flex !important;
  }

  .top-nav .dd-flyout.is-expanded > .dd-flyout-menu {
    display: flex !important;
  }

  .top-nav .dd-flyout {
    align-items: flex-start;
    width: 100%;
  }

  .top-nav .dropdown-collection a {
    justify-content: space-between;
  }

  body.is-nav-open {
    overflow: hidden;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-toggle__bars,
  .nav-toggle__bars::before,
  .nav-toggle__bars::after {
    transition: none;
  }
}

/* ---------- collection prev / next ---------- */
.work-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem 2rem;
  max-width: 72rem;
  margin: 0 auto clamp(3rem, 8vh, 5rem);
  padding-top: 2rem;
  border-top: 1px solid rgba(217, 210, 226, 0.14);
}

.work-pager a {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.work-pager a.is-next {
  text-align: right;
  align-items: flex-end;
}

.work-pager__dir {
  font-size: 0.56rem;
  font-weight: 400;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(226, 221, 234, 0.55);
}

.work-pager__title {
  font-family: "Bodoni Moda", "Didot", "Bodoni 72", ui-serif, Georgia, serif;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: #f2edf8;
  line-height: 1.25;
}

.work-pager__year {
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: rgba(226, 221, 234, 0.55);
}

.work-pager a:hover .work-pager__title {
  color: var(--violet-light, #c3aaf5);
}

@media (max-width: 560px) {
  .work-pager {
    grid-template-columns: 1fr;
  }

  .work-pager a.is-next {
    text-align: left;
    align-items: flex-start;
  }
}