/*
  Russia Mountains — Lens-inspired static gallery.
  Original design concept: Lens by HTML5 UP (html5up.net/lens), CC BY 3.0.
*/
:root {
  --side: 452px;
  --bg: #101517;
  --panel: #f2f0e9;
  --paper: #faf9f5;
  --ink: #1b2224;
  --muted: #737a78;
  --accent: #9b6a3d;
  --accent-soft: #c3a27f;
  --line: rgba(27, 34, 36, .115);
  --white: #fffdf8;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button { font: inherit; }
::selection { background: rgba(155, 106, 61, .24); }

#viewer {
  position: fixed;
  inset: 0 var(--side) 0 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 25% 20%, rgba(112,132,131,.32), transparent 34%),
    linear-gradient(145deg, #263033, #0c1113 72%);
  color: var(--white);
}
.media-stack, .hero-image, .viewer-wash, .viewer-grain { position: absolute; inset: 0; }
.hero-image {
  width: 100%; height: 100%; object-fit: cover;
  opacity: 0;
  transform: scale(1.025);
  transition: opacity .72s cubic-bezier(.22,.7,.16,1), transform 8s ease-out;
  filter: saturate(.94) contrast(1.035);
}
.hero-image.active { opacity: 1; transform: scale(1.055); }
.viewer-wash {
  background:
    linear-gradient(90deg, rgba(8,12,13,.18) 0%, rgba(8,12,13,0) 42%),
    linear-gradient(180deg, rgba(4,8,10,.22) 0%, rgba(5,9,10,.03) 36%, rgba(4,7,8,.80) 100%);
}
.viewer-grain {
  opacity: .16;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

.viewer-topbar {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; align-items: center; justify-content: space-between;
  padding: 32px clamp(28px, 4.2vw, 66px);
  z-index: 5;
}
.brand {
  display: inline-flex; gap: 10px; align-items: center;
  color: var(--white); text-decoration: none; text-transform: uppercase;
  letter-spacing: .17em; font-size: .72rem; font-weight: 750;
  text-shadow: 0 1px 14px rgba(0,0,0,.2);
}
.brand-mark { font-size: .75rem; transform: translateY(-1px); color: #e2c6a9; }
.counter { display: flex; align-items: center; gap: 10px; font-size: .7rem; letter-spacing: .12em; font-variant-numeric: tabular-nums; opacity: .92; }
.counter i { width: 34px; height: 1px; background: rgba(255,255,255,.5); display: block; }

.viewer-copy {
  position: absolute;
  left: clamp(30px, 5.6vw, 88px);
  right: clamp(30px, 5vw, 78px);
  bottom: clamp(74px, 10vh, 118px);
  max-width: 860px;
  z-index: 4;
  text-shadow: 0 2px 28px rgba(0,0,0,.26);
}
.viewer-copy .eyebrow {
  margin: 0 0 .8rem;
  text-transform: uppercase; letter-spacing: .18em;
  font-size: clamp(.7rem, .8vw, .82rem); font-weight: 750;
  color: #e3c8ac;
}
.viewer-copy h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.4rem, 7.4vw, 8.7rem);
  line-height: .84;
  letter-spacing: -.055em;
  font-weight: 500;
  max-width: 980px;
}
.viewer-copy .lead {
  max-width: 690px;
  margin: 1.4rem 0 1rem;
  font-size: clamp(1rem, 1.35vw, 1.22rem);
  line-height: 1.62;
  color: rgba(255,253,248,.92);
}
.viewer-links { display: flex; gap: 22px; flex-wrap: wrap; }
.text-link {
  display: inline-flex; align-items: center; gap: 7px;
  color: #fff; font-size: .78rem; letter-spacing: .04em;
  text-decoration: none; opacity: .74;
  border-bottom: 1px solid rgba(255,255,255,.38); padding-bottom: 3px;
  transition: opacity .18s ease, border-color .18s ease;
}
.text-link:hover { opacity: 1; border-color: rgba(255,255,255,.82); }
.text-link::after { content: "↗"; font-size: .75rem; }

.viewer-bottom {
  position: absolute; z-index: 4;
  left: clamp(30px, 5.6vw, 88px); right: clamp(30px, 5vw, 78px); bottom: 28px;
  display: flex; align-items: center; gap: 18px;
}
.viewer-bottom p { margin: 0; white-space: nowrap; font-size: .66rem; letter-spacing: .12em; text-transform: uppercase; opacity: .52; }
.progress-track { flex: 1; height: 1px; background: rgba(255,255,255,.24); overflow: hidden; }
.progress-track span { display: block; height: 100%; width: 10%; background: rgba(255,255,255,.88); transform-origin: left; transition: width .42s ease; }

.nav {
  position: absolute; top: 50%; z-index: 6;
  width: 48px; height: 72px; margin-top: -36px;
  border: 1px solid rgba(255,255,255,.15); border-radius: 999px;
  color: #fff; background: rgba(7,11,12,.14); backdrop-filter: blur(6px);
  cursor: pointer; transition: background .2s ease, transform .2s ease, border-color .2s ease;
}
.nav span { display: block; font-family: Georgia, serif; font-size: 2rem; transform: translateY(-1px); }
.nav:hover { background: rgba(7,11,12,.42); border-color: rgba(255,255,255,.34); }
.nav:active { transform: scale(.96); }
.nav.prev { left: 18px; }
.nav.next { right: 18px; }

#panel {
  position: fixed; top: 0; right: 0; bottom: 0; width: var(--side);
  background: var(--panel); overflow-y: auto; overscroll-behavior: contain;
  box-shadow: -14px 0 50px rgba(0,0,0,.20);
  scrollbar-width: thin; scrollbar-color: rgba(30,34,35,.22) transparent;
}
#panel::-webkit-scrollbar { width: 7px; }
#panel::-webkit-scrollbar-thumb { background: rgba(30,34,35,.20); border-radius: 999px; }
.panel-header { padding: 42px 38px 26px; background: linear-gradient(180deg, var(--paper), var(--panel)); border-bottom: 1px solid var(--line); }
.kicker { margin: 0 0 .8rem; color: var(--accent); text-transform: uppercase; letter-spacing: .18em; font-size: .68rem; font-weight: 800; }
.panel-header h2 { margin: 0; max-width: 360px; font-family: Georgia, "Times New Roman", serif; font-size: 2.5rem; line-height: .98; letter-spacing: -.035em; font-weight: 500; }
.panel-header .intro { margin: 1.2rem 0 0; color: #5e6664; font-size: .92rem; line-height: 1.62; }
.rule { display: flex; align-items: center; margin: 22px 0 14px; width: 100%; height: 1px; background: var(--line); }
.rule span { width: 62px; height: 1px; background: var(--accent); }
.panel-header .hint { margin: 0; color: var(--muted); font-size: .7rem; line-height: 1.5; }

#thumbnails { display: grid; grid-template-columns: 1fr 1fr; }
.card {
  position: relative; min-width: 0; padding-bottom: 14px;
  border-bottom: 1px solid var(--line); background: transparent;
  transition: background .2s ease;
}
.card:nth-child(odd) { border-right: 1px solid var(--line); }
.card.active { background: #fffefa; }
.thumb {
  display: block; position: relative; width: 100%; height: 138px; padding: 0; border: 0;
  overflow: hidden; cursor: pointer; background: #d8d7d2;
}
.thumb::after { content: ""; position: absolute; inset: 0; box-shadow: inset 0 0 0 1px rgba(255,255,255,.03); background: linear-gradient(180deg, transparent 68%, rgba(5,8,9,.24)); pointer-events: none; }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; filter: saturate(.82) contrast(.98); transform: scale(1.012); transition: transform .6s cubic-bezier(.2,.8,.2,1), filter .45s ease, opacity .2s ease; }
.card:hover .thumb img, .card.active .thumb img { transform: scale(1.07); filter: saturate(1.02) contrast(1.02); }
.thumb-index { position: absolute; z-index: 2; left: 10px; bottom: 8px; color: #fff; font-size: .63rem; font-weight: 700; letter-spacing: .08em; text-shadow: 0 1px 8px rgba(0,0,0,.5); }
.card-copy { padding: 12px 14px 0; }
.card-copy h3 { margin: 0; font-size: .88rem; line-height: 1.16; font-weight: 700; transition: color .2s ease; }
.card.active .card-copy h3 { color: var(--accent); }
.card-copy p { margin: .34rem 0 0; color: var(--muted); font-size: .68rem; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

#footer { padding: 26px 34px 38px; color: var(--muted); font-size: .7rem; line-height: 1.58; }
#footer details { border-top: 1px solid var(--line); padding-top: 16px; }
#footer summary { cursor: pointer; color: var(--ink); font-weight: 700; list-style: none; }
#footer summary::-webkit-details-marker { display: none; }
#footer summary::after { content: "+"; float: right; color: var(--accent); font-size: 1rem; line-height: 1; }
#footer details[open] summary::after { content: "−"; }
#footer .credits p { margin: .8rem 0 0; }
#footer .copyright { margin: 1.2rem 0 0; opacity: .74; }
.noscript { position: fixed; z-index: 50; left: 20px; bottom: 20px; background: #fff; color: #111; padding: 12px 16px; border-radius: 6px; }

body.is-preload .viewer-copy, body.is-preload .viewer-topbar, body.is-preload .viewer-bottom { opacity: 0; transform: translateY(8px); }
.viewer-copy, .viewer-topbar, .viewer-bottom { transition: opacity .5s ease, transform .5s ease; }

@media (max-width: 1100px) {
  :root { --side: 395px; }
  .panel-header { padding-left: 30px; padding-right: 30px; }
  .thumb { height: 124px; }
  .viewer-copy h1 { font-size: clamp(3rem, 7vw, 6.7rem); }
}

@media (max-width: 860px) {
  body { overflow: auto; background: var(--panel); }
  #viewer { position: relative; inset: auto; width: 100%; height: 69svh; min-height: 520px; }
  #panel { position: relative; inset: auto; width: 100%; overflow: visible; box-shadow: none; }
  .panel-header { padding: 32px 26px 24px; }
  .panel-header h2 { max-width: 650px; }
  .panel-header .intro { max-width: 720px; }
  #thumbnails { grid-template-columns: repeat(3, 1fr); }
  .card:nth-child(odd) { border-right: none; }
  .card:not(:nth-child(3n)) { border-right: 1px solid var(--line); }
  .thumb { height: 154px; }
  .viewer-copy { bottom: 72px; }
}

@media (max-width: 620px) {
  #viewer { height: 76svh; min-height: 560px; }
  .viewer-topbar { padding: 22px 20px; }
  .brand { font-size: .62rem; }
  .counter { font-size: .62rem; }
  .viewer-copy { left: 22px; right: 22px; bottom: 78px; }
  .viewer-copy h1 { font-size: clamp(3.15rem, 15vw, 5.4rem); line-height: .88; }
  .viewer-copy .lead { font-size: .93rem; line-height: 1.52; margin-top: 1rem; }
  .viewer-bottom { left: 22px; right: 22px; bottom: 24px; }
  .viewer-bottom p { display: none; }
  .nav { top: 44%; width: 38px; height: 56px; margin-top: -28px; }
  .nav.prev { left: 8px; } .nav.next { right: 8px; }
  #thumbnails { grid-template-columns: 1fr 1fr; }
  .card:not(:nth-child(3n)) { border-right: none; }
  .card:nth-child(odd) { border-right: 1px solid var(--line); }
  .thumb { height: 136px; }
  .panel-header h2 { font-size: 2.18rem; }
}

@media (max-width: 390px) {
  .viewer-links { gap: 14px; }
  #thumbnails { grid-template-columns: 1fr; }
  .card, .card:nth-child(odd) { border-right: none; }
  .thumb { height: 190px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
  .hero-image { transform: none !important; }
}