:root {
  color-scheme: dark;
  --bg: #08090d;
  --surface: #111118;
  --line: rgba(255,255,255,.14);
  --line-strong: rgba(255,255,255,.27);
  --text: #f3f0ec;
  --soft: rgba(243,240,236,.65);
  --faint: rgba(243,240,236,.4);
  --pink: #df91ad;
  --gold: #e4bd6e;
  --safe-t: max(12px, env(safe-area-inset-top));
  --safe-r: max(16px, env(safe-area-inset-right));
  --safe-b: max(12px, env(safe-area-inset-bottom));
  --safe-l: max(16px, env(safe-area-inset-left));
}

* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body { background: var(--bg); color: var(--text); font-family: "Noto Serif SC", "Songti SC", serif; }
a { color: inherit; text-decoration: none; }

.date-library {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 320px;
  overflow: hidden;
  background:
    radial-gradient(circle at 73% 28%, rgba(223,145,173,.09), transparent 27%),
    radial-gradient(circle at 18% 78%, rgba(228,189,110,.06), transparent 24%),
    linear-gradient(118deg, #08090d 0 48%, #0c0b11 100%);
}

.date-library::before {
  position: absolute;
  inset: 0;
  content: "";
  opacity: .28;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(90deg, #000, transparent 82%);
}

.topbar {
  position: relative;
  z-index: 4;
  height: calc(76px + var(--safe-t));
  display: grid;
  grid-template-columns: 48px auto 1fr;
  align-items: center;
  gap: 18px;
  padding: var(--safe-t) var(--safe-r) 0 var(--safe-l);
  border-bottom: 1px solid var(--line);
  background: rgba(6,7,10,.78);
  backdrop-filter: blur(18px);
}

.back-button {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  transition: border-color 160ms ease, background 160ms ease;
}
.back-button svg { width: 22px; fill: none; stroke: var(--text); stroke-width: 1.5; }
.back-button:hover, .back-button:focus-visible { border-color: var(--gold); background: rgba(228,189,110,.08); outline: none; }

.title-group { min-width: 165px; }
.title-group span { display: block; color: var(--gold); font: 500 9px/1 "DM Mono", monospace; letter-spacing: .22em; }
.title-group h1 { margin: 7px 0 0; font-size: 25px; line-height: 1; font-weight: 600; letter-spacing: .08em; }
.topbar p { justify-self: end; margin: 0; color: var(--faint); font-size: 12px; }

.library-content {
  position: relative;
  z-index: 2;
  height: calc(100% - var(--safe-t) - 112px);
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: clamp(18px, 3vw, 44px);
  padding: clamp(18px, 4vh, 36px) var(--safe-r) 18px var(--safe-l);
}

.section-heading { align-self: start; padding-top: 4px; }
.section-heading span { display: block; color: var(--pink); font-size: 11px; }
.section-heading strong { display: block; margin-top: 11px; font-size: clamp(24px, 2.7vw, 38px); font-weight: 500; }
.section-heading small { display: block; margin-top: 12px; color: var(--faint); font: 11px "DM Mono", monospace; letter-spacing: .16em; }

.date-track {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(280px, 1fr));
  gap: clamp(14px, 2vw, 24px);
}

.date-card {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(150px, 43%) minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: rgba(14,14,20,.86);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}
.date-card:hover, .date-card:focus-visible { transform: translateY(-4px); outline: none; background: rgba(19,18,24,.94); }
.date-card--photo:hover, .date-card--photo:focus-visible { border-color: rgba(223,145,173,.72); }
.date-card--stamp:hover, .date-card--stamp:focus-visible { border-color: rgba(228,189,110,.72); }

.card-visual { position: relative; min-height: 0; overflow: hidden; background: #0b0b10; border-right: 1px solid var(--line); }
.card-visual::before { position: absolute; inset: 0; content: ""; background: repeating-linear-gradient(0deg, transparent 0 51px, rgba(255,255,255,.035) 52px); }
.card-visual img { position: absolute; z-index: 2; left: 14%; bottom: -20%; width: 98%; height: 106%; object-fit: contain; object-position: bottom center; filter: brightness(.72) saturate(.72); mask-image: linear-gradient(#000 0 75%, transparent 99%); }
.date-card--photo .card-visual { background: radial-gradient(circle at 50% 20%, rgba(223,145,173,.2), transparent 37%), #0b0b10; }
.date-card--stamp .card-visual { background: radial-gradient(circle at 50% 20%, rgba(228,189,110,.16), transparent 38%), #0b0b10; }
.visual-index { position: absolute; z-index: 4; right: 10px; bottom: 9px; color: rgba(255,255,255,.28); font: 11px "DM Mono", monospace; }

.photo-strip { position: absolute; z-index: 3; left: 9px; top: 9px; bottom: 9px; width: 32px; display: grid; grid-template-rows: repeat(4, 1fr); gap: 4px; padding: 4px; background: rgba(223,145,173,.17); border: 1px solid rgba(223,145,173,.45); }
.photo-strip i { display: grid; place-items: end center; background: rgba(255,255,255,.08); color: rgba(255,255,255,.45); font: normal 6px "DM Mono", monospace; }
.stamp-mark { position: absolute; z-index: 3; left: 11px; top: 12px; display: grid; grid-template-columns: repeat(2, 28px); border: 1px solid rgba(228,189,110,.6); transform: rotate(-5deg); color: var(--gold); }
.stamp-mark i { width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid rgba(228,189,110,.23); font-style: normal; font-size: 14px; }

.card-copy { min-width: 0; display: flex; flex-direction: column; padding: clamp(16px, 2.1vw, 28px); }
.card-meta { display: flex; align-items: center; justify-content: space-between; gap: 10px; color: var(--faint); font-size: 10px; }
.card-meta b { font-weight: 400; white-space: nowrap; }
.date-card--photo .card-meta span { color: var(--pink); }
.date-card--stamp .card-meta span { color: var(--gold); }
.card-copy h2 { margin: auto 0 8px; font-size: clamp(27px, 3.2vw, 48px); line-height: 1.08; font-weight: 500; letter-spacing: .04em; }
.card-copy p { min-height: 3.5em; margin: 0; color: var(--soft); font-size: clamp(11px, 1vw, 14px); line-height: 1.75; }
.card-foot { margin-top: auto; padding-top: 14px; display: flex; align-items: end; justify-content: space-between; gap: 12px; border-top: 1px solid var(--line); }
.card-foot span { color: var(--faint); font-size: 9px; }
.card-foot strong { white-space: nowrap; font-size: 13px; font-weight: 500; }
.card-foot i { margin-left: 7px; font-style: normal; }

footer { position: absolute; z-index: 3; left: var(--safe-l); right: var(--safe-r); bottom: var(--safe-b); height: 28px; display: flex; align-items: center; gap: 12px; color: var(--faint); font-size: 9px; }
footer i { flex: 1; height: 1px; background: var(--line); }
footer small { font-size: inherit; }

@media (max-width: 920px) {
  .topbar { height: calc(58px + var(--safe-t)); grid-template-columns: 44px auto 1fr; gap: 12px; }
  .back-button { width: 44px; height: 44px; }
  .title-group span { display: none; }
  .title-group h1 { margin: 0; font-size: 20px; }
  .topbar p { font-size: 10px; }
  .library-content { height: calc(100% - var(--safe-t) - 88px); grid-template-columns: 108px minmax(0, 1fr); gap: 14px; padding-top: 14px; }
  .section-heading span { font-size: 9px; }
  .section-heading strong { margin-top: 7px; font-size: 24px; }
  .section-heading small { margin-top: 7px; font-size: 9px; }
  .date-track { gap: 10px; }
  .date-card { grid-template-columns: 38% 1fr; }
  .card-copy { padding: 13px; }
  .card-copy h2 { font-size: clamp(24px, 4vw, 34px); }
  .card-copy p { font-size: 10px; line-height: 1.55; }
  .card-foot { padding-top: 8px; }
  .card-foot span { display: none; }
  .card-foot strong { margin-left: auto; font-size: 11px; }
}

@media (max-width: 720px) {
  .topbar p { display: none; }
  .library-content { grid-template-columns: 88px minmax(0,1fr); }
  .date-track { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; overscroll-behavior-x: contain; padding-right: 12px; scrollbar-width: thin; }
  .date-card { flex: 0 0 min(76vw, 430px); scroll-snap-align: start; }
  .card-visual { min-width: 130px; }
}

@media (max-height: 370px) {
  .library-content { padding-top: 10px; padding-bottom: 12px; }
  .card-meta { font-size: 8px; }
  .card-copy h2 { margin-bottom: 5px; }
  .card-copy p { min-height: 0; }
  footer { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}