/* ===== Zehao Xue — hub landing. Consumes tokens from css/theme.css ===== */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--body-font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

h1, h2, h3 {
  font-family: var(--head-font);
  color: var(--green-head);
  text-transform: uppercase;
  letter-spacing: .03em;
  margin: 0 0 .4em;
}

a { color: var(--green-mid); text-decoration: none; }
a:hover { color: var(--sage-dark); }

.container { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 1.5rem; }

/* ===== Header bar ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--green-deep);
  border-bottom: 3px solid var(--sage);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}
.wordmark {
  font-family: var(--head-font);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: #fff;
}
.wordmark:hover { color: #fff; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a {
  color: #e9ece6;
  font-size: .82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: .35rem 0;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
.nav-links a:hover { color: #fff; border-color: var(--sage); }
.nav-links a.cta {
  background: var(--sage);
  color: var(--green-deep);
  padding: .4rem .9rem;
  border-radius: 4px;
  border: none;
}
.nav-links a.cta:hover { background: #fff; }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
}

/* ===== Sections ===== */
section { padding: 5rem 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: 0; }
.section-title { font-size: 2rem; margin-bottom: 1.5rem; }
.section-title::after {
  content: "";
  display: block;
  width: 60px; height: 3px;
  background: var(--sage);
  margin-top: .5rem;
}

/* ===== Hero ===== */
.hero {
  background: var(--bg-soft);
  padding: 6rem 0;
  text-align: center;
}
.hero img.avatar {
  width: 150px; height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 5px solid var(--sage);
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-size: clamp(3rem, 9vw, 5.5rem);
  color: var(--green-deep);
  margin-bottom: .2em;
}
.hero h1 .accent { color: var(--sage-dark); }
.hero .tagline {
  font-size: 1.25rem;
  color: var(--sage-dark);
  max-width: 640px;
  margin: 0 auto 1.8rem;
}
.doors { display: flex; justify-content: center; gap: .8rem; flex-wrap: wrap; margin: 0 0 1.6rem; }
.door {
  display: inline-flex; align-items: center; gap: .5rem;
  background: var(--green-mid); color: #fff; text-decoration: none;
  font-family: var(--head-font); text-transform: uppercase; letter-spacing: .06em; font-size: 1.15rem;
  padding: .65rem 1.4rem; border-radius: 6px; transition: background .15s, transform .15s;
}
.door i { font-size: .95rem; opacity: .85; }
.door:hover { background: var(--green-deep); color: #fff; transform: translateY(-2px); }
.socials { display: flex; justify-content: center; gap: 1.2rem; }
.socials a {
  width: 44px; height: 44px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--sage);
  color: var(--green-deep);
  font-size: 1.15rem;
  transition: transform .15s, background .15s;
}
.socials a:hover { background: var(--green-mid); color: #fff; transform: translateY(-3px); }

/* ===== About ===== */
.about-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; max-width: 760px; }
.about-grid p { margin: 0 0 1rem; color: var(--ink); font-size: 1.05rem; }

/* ===== Cards (projects / photography) ===== */
/* projects: a horizontal, snap-scrolling strip on every screen size */
.card-grid {
  display: flex; gap: 1.25rem; align-items: stretch;
  overflow-x: auto; overflow-y: hidden;
  scroll-snap-type: x mandatory; scroll-padding-inline: 1.5rem;
  margin: 0 -1.5rem; padding: .35rem 1.5rem 1rem;
  scrollbar-width: thin; scrollbar-color: var(--sage) transparent;
}
.card-grid::-webkit-scrollbar { height: 8px; }
.card-grid::-webkit-scrollbar-thumb { background: var(--sage); border-radius: 4px; }
.card-grid::-webkit-scrollbar-track { background: transparent; }
.card-grid .card { flex: 0 0 300px; scroll-snap-align: start; }
.scroll-hint { margin: -.6rem 0 .6rem; font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.card-links { display: flex; gap: 1rem; flex-wrap: wrap; }
/* the one production / official-government item stands apart from the demos */
.card--official { border-color: var(--green-mid); border-width: 2px; background: #fbfcfa; }
.badge--official { background: var(--green-deep); color: #fff; }
.badge--official i { margin-right: .3rem; }
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform .15s, box-shadow .15s, border-color .15s;
  display: flex;
  flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 10px 24px rgba(23,43,23,.10); border-color: var(--sage); }
.card h3 { font-size: 1.4rem; color: var(--green-head); }
.card p { color: var(--muted); flex: 1; margin: .25rem 0 1rem; }
.card .card-link { font-weight: 700; text-transform: uppercase; font-size: .8rem; letter-spacing: .06em; }
.badge {
  display: inline-block;
  align-self: flex-start;
  background: var(--bg-soft);
  color: var(--sage-dark);
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: .2rem .55rem;
  border-radius: 3px;
  margin-bottom: .6rem;
}

/* photography teaser tiles */
.photo-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px,1fr)); gap: 1rem; margin-top: 1.5rem; }
@media (max-width: 600px) {
  /* photos become a swipe strip on phones */
  .photo-grid {
    display: flex; gap: .75rem; overflow-x: auto; overflow-y: hidden;
    scroll-snap-type: x mandatory; scroll-padding-inline: 1.5rem;
    margin: 1.5rem -1.5rem 0; padding: 0 1.5rem .5rem; scrollbar-width: none;
  }
  .photo-grid::-webkit-scrollbar { display: none; }
  .photo-grid .photo-tile { flex: 0 0 74vw; scroll-snap-align: center; scroll-snap-stop: always; }
  .card-grid .card { flex: 0 0 82vw; scroll-snap-align: center; scroll-snap-stop: always; }
}
.photo-tile {
  aspect-ratio: 4 / 3;
  width: 100%; height: auto; object-fit: cover; display: block;
  border-radius: 6px;
  background: var(--bg-soft);
  transition: transform .15s, filter .15s;
}

/* ===== Resume CTA ===== */
.cta-row { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
.btn {
  display: inline-block;
  background: var(--green-mid);
  color: #fff;
  font-family: var(--head-font);
  text-transform: uppercase;
  letter-spacing: .06em;
  font-size: 1.1rem;
  padding: .7rem 1.6rem;
  border-radius: 5px;
  transition: background .15s;
}
.btn:hover { background: var(--green-deep); color: #fff; }

/* ===== Contact ===== */
.contact-list { list-style: none; margin: 1.6rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: .6rem 2rem; font-size: 1.05rem; }
.contact-list i { color: var(--sage-dark); width: 1.4rem; }

/* ===== Footer ===== */
.site-footer {
  background: var(--green-deep);
  color: #c8cfc2;
  text-align: center;
  padding: 2rem 0;
  font-size: .85rem;
}
.site-footer a { color: var(--sage); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--green-deep);
    border-bottom: 3px solid var(--sage);
    max-height: 0;
    overflow: hidden;
    transition: max-height .25s ease;
  }
  .nav-links.open { max-height: 420px; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; width: 100%; padding: .9rem 1.5rem; }
  .nav-links a.cta { border-radius: 0; }
}