:root{
  --bg:#15120F;
  --bg-panel:#201B16;
  --bg-panel-2:#2A241C;
  --ink:#F3ECE0;
  --ink-muted:#9C9184;
  --gold:#B98A4C;
  --gold-dim:#8C6A3B;
  --night:#2A3C46;
  --night-ink:#C7D6DB;
  --line: rgba(243,236,224,0.12);
  --font-zh: 'Iansui', sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent;}

html{scroll-behavior:smooth;}

body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-zh);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

body.theme-night{
  --gold:var(--night-ink);
  --gold-dim:var(--night);
}

a{color:inherit;text-decoration:none;}

::selection{background:var(--gold);color:var(--bg);}

.mono{
  font-family:'IBM Plex Mono','Iansui',monospace;
  letter-spacing:0.04em;
}

/* ---------- Nav ---------- */
header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:28px 5vw;
  mix-blend-mode:difference;
}
.logo{
  font-family:'Iansui', var(--font-zh);
  font-size:1.35rem;
}
nav ul{
  display:flex;
  gap:36px;
  list-style:none;
}
nav a{
  font-size:0.78rem;
  letter-spacing:0.08em;
  font-family:'IBM Plex Mono','Iansui',monospace;
  opacity:0.85;
  transition:opacity 0.2s ease;
}
nav a:hover{opacity:1;}
nav a:focus-visible, .logo:focus-visible{outline:1px solid var(--gold);outline-offset:4px;}
.nav-toggle{display:none;}

@media (max-width:720px){
  nav ul{
    position:fixed;
    top:0;right:0;
    height:100vh;
    width:min(78vw,320px);
    background:var(--bg-panel);
    flex-direction:column;
    justify-content:center;
    align-items:flex-start;
    gap:28px;
    padding:0 40px;
    transform:translateX(100%);
    transition:transform 0.35s ease;
    mix-blend-mode:normal;
  }
  nav ul.open{transform:translateX(0);}
  nav a{font-size:0.95rem;}
  .nav-toggle{
    display:block;
    background:none;border:none;color:var(--ink);
    font-family:'IBM Plex Mono','Iansui',monospace;
    font-size:0.78rem;letter-spacing:0.08em;
    cursor:pointer;
    padding:12px 8px;
    margin:-12px -8px;
    z-index:110;
    mix-blend-mode:difference;
  }
}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  height:100vh;
  height:100svh;
  min-height:640px;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
}
.hero-frame{
  position:absolute;inset:0;
}
.hero-frame .hero-bg{
  position:absolute;inset:0;
  width:120%;height:100%;object-fit:cover;
  filter:saturate(0.92) contrast(1.03);
  opacity:0;
  transition:opacity 1.6s ease;
}
.hero-frame .hero-bg.is-active{opacity:1;}
.hero-frame::after{
  content:"";
  position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(21,18,15,0.15) 0%, rgba(21,18,15,0.05) 40%, rgba(21,18,15,0.85) 100%);
}
.hero-tag{
  position:absolute;
  top:110px;left:5vw;
  font-size:0.78rem;
  color:var(--gold);
  z-index:2;
}
.hero-content{
  position:relative;
  z-index:2;
  padding:0 5vw 64px;
  max-width:1350px;
}
.hero-content .eyebrow{
  font-size:0.8rem;
  color:var(--gold);
  letter-spacing:0.1em;
  margin-bottom:18px;
  display:block;
}
.hero-content h1{
  font-family:'Iansui', var(--font-zh);
  font-size:clamp(2.4rem,6.4vw,4.8rem);
  line-height:1.35;
  letter-spacing:0.01em;
}
.hero-content h1 em{
  font-style:normal;
  color:var(--gold);
}
.hero-content p{
  margin-top:22px;
  max-width:520px;
  color:var(--ink-muted);
  font-size:1.05rem;
  line-height:1.8;
}
.scroll-cue{
  position:absolute;
  bottom:28px;right:5vw;
  z-index:2;
  font-size:0.72rem;
  color:var(--ink-muted);
  display:flex;
  align-items:center;
  gap:10px;
}
.scroll-cue .stick{
  width:1px;height:34px;
  background:var(--ink-muted);
  position:relative;
  overflow:hidden;
}
.scroll-cue .stick::after{
  content:"";
  position:absolute;
  top:-100%;left:0;right:0;height:100%;
  background:var(--gold);
  animation:scrollcue 2.2s ease-in-out infinite;
}
@keyframes scrollcue{
  0%{top:-100%;}
  50%{top:100%;}
  100%{top:100%;}
}

/* ---------- Section shell ---------- */
#top,#categories,#about,#contact{scroll-margin-top:100px;}
section{padding:120px 5vw;}
.section-head{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:24px;
  margin-bottom:56px;
  border-bottom:1px solid var(--line);
  padding-bottom:28px;
  flex-wrap:wrap;
}
.section-head .num{
  font-size:0.78rem;
  color:var(--gold);
  margin-bottom:10px;
  display:block;
}
.section-head h2{
  font-family:'Iansui', var(--font-zh);
  font-size:clamp(2rem,4.2vw,3.2rem);
}

/* ---------- Contact-sheet grid ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:14px;
}
#categoryGrid{
  grid-template-columns:repeat(2,1fr);
}
#timelineGrid{
  grid-template-columns:repeat(2,1fr);
}
.frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--bg-panel);
  cursor:pointer;
  border:1px solid transparent;
  transition:border-color 0.25s ease;
}
.frame:hover{border-color:var(--gold-dim);}
.frame img{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
  filter:saturate(0.9) contrast(1.02);
  transition:transform 0.6s cubic-bezier(.2,.7,.2,1), filter 0.4s ease;
  -webkit-user-select:none;user-select:none;
  -webkit-touch-callout:none;
}
.frame:hover img{transform:scale(1.045);}

.frame .frame-num{
  position:absolute;top:12px;left:12px;
  font-family:'IBM Plex Mono',monospace;
  font-size:0.68rem;
  color:var(--ink);
  background:rgba(21,18,15,0.55);
  padding:3px 8px;
  border-radius:3px;
  backdrop-filter:blur(2px);
  z-index:2;
}
.frame .frame-cap{
  position:absolute;left:0;right:0;bottom:0;
  padding:14px 12px 12px;
  background:linear-gradient(0deg, rgba(21,18,15,0.92) 0%, rgba(21,18,15,0) 100%);
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.72rem;
  color:var(--ink-muted);
  opacity:0;
  transform:translateY(6px);
  transition:all 0.3s ease;
  z-index:2;
}
.frame:hover .frame-cap{opacity:1;transform:translateY(0);}
.frame .frame-cap span{color:var(--gold);}

/* uniform square tiles, three per row */
.frame.p-tall,.frame.p-wide,.frame.p-sq,.frame.p-full,.frame.p-narrow{
  grid-column:span 1;
  grid-row:span 1;
  aspect-ratio:1/1;
}

@media (max-width:900px){
  .grid{grid-template-columns:repeat(2,1fr);}
}

/* ---------- Month divider (timeline page) ---------- */
.month-divider{
  grid-column:1/-1;
  display:flex;
  align-items:baseline;
  gap:14px;
  padding:32px 4px 10px;
  border-bottom:1px solid var(--line);
}
.month-divider:first-child{padding-top:0;}
.month-divider .month-label{
  font-family:'Iansui', var(--font-zh);
  font-size:1.4rem;
}
.month-divider .month-count{
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.75rem;
  color:var(--gold);
}

/* ---------- Category card overlay (index page) ---------- */
.cat-card-label{
  position:absolute;left:0;right:0;bottom:0;
  padding:20px 18px 16px;
  background:linear-gradient(0deg, rgba(21,18,15,0.95) 0%, rgba(21,18,15,0.15) 100%);
  z-index:2;
}
.cat-card-label h3{
  font-family:'Iansui', var(--font-zh);
  font-size:1.5rem;
  margin-bottom:4px;
}
.cat-card-label p{
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.7rem;
  color:var(--ink-muted);
}
.cat-card-label p span{color:var(--gold);}

/* ---------- Page header (category pages) ---------- */
.page-header{
  padding:150px 5vw 60px;
}
.page-header .back-link{
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:1.0rem;
  color:var(--gold);
  display:inline-block;
  margin-bottom:28px;
}
.page-header .back-link:hover{color:var(--ink);}
.page-header h1{
  font-family:'Iansui', var(--font-zh);
  font-size:clamp(2.4rem,6vw,4rem);
  margin-bottom:14px;
}
.page-header .meta{
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.78rem;
  color:var(--ink-muted);
}
.page-header .meta span{color:var(--gold);}

.cat-pager{
  display:flex;
  justify-content:space-between;
  padding:0px 5vw 0;
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:1.2rem;
  color:var(--ink-muted);
  flex-wrap:wrap;
  gap:0px;
}
.cat-pager a{color:var(--ink);transition:color 0.2s ease;display:inline-block;padding:10px 0;}
.cat-pager a:hover{color:var(--gold);}

/* ---------- About ---------- */
.about{
  display:grid;
  grid-template-columns:0.9fr 1.1fr;
  gap:80px;
  align-items:center;
}
.about-photo{
  aspect-ratio:4/5;
  overflow:hidden;
  background:var(--bg-panel);
}
.about-photo img{width:100%;height:100%;object-fit:cover;filter:saturate(0.9);}
.about-text .num{font-size:0.78rem;color:var(--gold);display:block;margin-bottom:18px;}
.about-text h2{
  font-family:'Iansui', var(--font-zh);
  font-size:clamp(1.8rem,3.4vw,2.6rem);
  margin-bottom:24px;
  max-width:560px;
  line-height:1.5;
}
.about-text p{
  color:var(--ink-muted);
  line-height:1.9;
  max-width:900px;
  margin-bottom:16px;
}
.about-stats{
  display:flex;
  gap:40px;
  margin-top:36px;
  flex-wrap:wrap;
}
.about-stats div{border-top:1px solid var(--line);padding-top:12px;min-width:110px;}
.about-stats strong{
  display:block;
  font-family:'Iansui', var(--font-zh);
  font-size:1.8rem;
  color:var(--gold);
}
.about-stats span{
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.7rem;
  color:var(--ink-muted);
  letter-spacing:0.06em;
}

@media (max-width:820px){
  .about{grid-template-columns:1fr;gap:40px;}
}

/* ---------- Contact ---------- */
.contact{
  text-align:center;
  padding:140px 5vw 100px;
}
.contact .num{font-size:0.78rem;color:var(--gold);display:block;margin-bottom:20px;}
.contact h2{
  font-family:'Iansui', var(--font-zh);
  font-size:clamp(2.2rem,6vw,4rem);
  max-width:900px;
  margin:0 auto 40px;
  line-height:1.5;
}
.contact-actions{
  display:flex;
  justify-content:center;
  gap:18px;
  flex-wrap:wrap;
}
.btn{
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.8rem;
  padding:16px 32px;
  border-radius:999px;
  transition:all 0.25s ease;
}
.btn-primary{
  background:var(--gold);
  color:var(--bg);
}
.btn-primary:hover{background:var(--ink);}
.btn-secondary{
  border:1px solid var(--line);
  color:var(--ink);
}
.btn-secondary:hover{border-color:var(--gold);color:var(--gold);}
.btn:focus-visible{outline:2px solid var(--gold);outline-offset:3px;}

footer{
  padding:32px 5vw;
  display:flex;
  justify-content:space-between;
  border-top:1px solid var(--line);
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.72rem;
  color:var(--ink-muted);
  flex-wrap:wrap;
  gap:12px;
}

/* ---------- Lightbox ---------- */
.lightbox{
  position:fixed;inset:0;
  background:rgba(10,9,7,0.96);
  z-index:200;
  display:none;
  align-items:center;
  justify-content:center;
  padding:6vh 4vw;
}
.lightbox.open{display:flex;}
.lightbox img{
  max-width:100%;max-height:88vh;
  object-fit:contain;
  box-shadow:0 30px 80px rgba(0,0,0,0.6);
  -webkit-user-select:none;user-select:none;
  -webkit-touch-callout:none;
}
.lightbox-cap{
  position:absolute;bottom:28px;left:0;right:0;
  text-align:center;
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.78rem;
  color:var(--ink-muted);
}
.lightbox-cap span{color:var(--gold);}
.lightbox-exif{
  position:absolute;bottom:6px;left:0;right:0;
  text-align:center;
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.7rem;
  letter-spacing:0.06em;
  color:var(--ink-muted);
  opacity:0.75;
}
.lightbox-exif span{color:var(--gold);margin:0 2px;}
.lightbox-close{
  position:absolute;top:16px;right:calc(5vw - 12px);
  background:none;border:none;
  color:var(--ink);
  font-family:'IBM Plex Mono','Iansui',monospace;
  font-size:0.8rem;
  padding:12px;
  cursor:pointer;
}
.lightbox-close:focus-visible{outline:2px solid var(--gold);outline-offset:3px;}

@media (prefers-reduced-motion: reduce){
  *{animation:none !important; transition:none !important; scroll-behavior:auto !important;}
}

/* ---------- Touch devices: hover effects never trigger, so surface captions directly ---------- */
@media (hover:none){
  .frame .frame-cap{opacity:1;transform:translateY(0);}
}

/* ---------- Small phones ---------- */
@media (max-width:480px){
  section{padding:80px 5vw;}
  .page-header{padding:110px 5vw 40px;}
  .grid{gap:8px;}
  .cat-card-label{padding:14px 12px 12px;}
  .cat-card-label h3{font-size:1.2rem;}
  .contact{padding:100px 5vw 80px;}
  .btn{padding:14px 24px;}
}