/* ============================================================
   base.css — shared foundation for every page.
   Themes override the custom properties below and add their own
   ornament. Keep this file theme-neutral.
   ============================================================ */

*,
*::before,
*::after { box-sizing: border-box; }

* { margin: 0; }

:root {
  /* Overridden per theme. */
  --bg: #fbfaf7;
  --bg-2: #f2efe9;
  --ink: #1a1614;
  --ink-soft: #5c554e;
  --accent: #c1272d;
  --gold: #b08d57;
  --line: rgba(26, 22, 20, 0.14);

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-cjk: "Noto Serif SC", "Songti SC", serif;

  --max: 1240px;
  --gap: clamp(0.6rem, 1.4vw, 1.1rem);
  --radius: 2px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.96rem + 0.3vw, 1.12rem);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); clip-path: inset(50%);
  overflow: hidden; white-space: nowrap;
}

.wrap { width: min(100% - 2.4rem, var(--max)); margin-inline: auto; }

/* ---- Top nav (back to home) ---------------------------------- */
.site-nav {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1.1rem, 3vw, 2.2rem);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}
.site-nav a { text-decoration: none; }
.site-nav__home { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 600; }
.site-nav__home::before { content: "←"; font-size: 1em; }
.site-nav__couple { color: var(--ink-soft); font-style: italic; text-transform: none; letter-spacing: 0.02em; }
@media (max-width: 640px) { .site-nav__couple { display: none; } }

/* ---- Section heading used on gallery pages ------------------- */
.gallery-head { text-align: center; }
.gallery-head__zh {
  font-family: var(--font-cjk);
  color: var(--accent);
  letter-spacing: 0.3em;
}
.gallery-head__en {
  font-family: var(--font-display);
  line-height: 1.02;
}
.gallery-head__blurb {
  max-width: 46ch; margin-inline: auto;
  color: var(--ink-soft);
}

/* ---- Photo grids --------------------------------------------- */
.gallery { width: min(100% - 2rem, var(--max)); margin: 0 auto; }

/* Masonry via CSS columns — robust, no layout JS. */
.gallery--masonry {
  column-gap: var(--gap);
  columns: 3 260px;
}
.gallery--masonry .photo { break-inside: avoid; margin-bottom: var(--gap); }

/* Uniform grid alternative. */
.gallery--grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--gap);
}
.gallery--grid .photo { margin: 0; }
.gallery--grid .photo__frame { aspect-ratio: var(--w) / var(--h); }
.gallery--grid .photo__img { width: 100%; height: 100%; object-fit: cover; }

.photo { position: relative; }
.photo__frame {
  display: block;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-2);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.photo__btn {
  display: block; width: 100%; padding: 0; border: 0; cursor: pointer;
  background: none;
  border-radius: var(--radius);
}
.photo__img {
  width: 100%;
  transition: transform 0.7s var(--ease);
  will-change: transform;
}
@media (hover: hover) {
  .photo__frame::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.16), transparent 45%);
    opacity: 0; transition: opacity 0.5s var(--ease);
  }
  .photo:hover .photo__frame { box-shadow: 0 16px 40px -18px rgba(0,0,0,0.5); }
  .photo:hover .photo__frame::after { opacity: 1; }
  .photo:hover .photo__img { transform: scale(1.045); }
}

.gallery-empty {
  text-align: center; color: var(--ink-soft);
  padding: 3rem 1rem; font-style: italic;
}

/* ---- Scroll reveal ------------------------------------------- */
/* Only hide when JS is running (html.js). Without JS, everything is
   visible by default — the gallery never depends on scripts to be seen. */
.js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---- Footer -------------------------------------------------- */
.site-foot {
  text-align: center;
  padding: clamp(3rem, 8vw, 6rem) 1.4rem;
  color: var(--ink-soft);
}
.site-foot__seal {
  font-family: var(--font-cjk);
  color: var(--accent);
  font-size: 1.6rem;
  display: inline-grid; place-items: center;
  width: 2.6em; height: 2.6em;
  border: 1.5px solid var(--accent);
  border-radius: 4px;
  margin-bottom: 1.2rem;
}
.site-foot__line { font-family: var(--font-display); font-size: 1.1rem; }

/* ---- Lightbox ------------------------------------------------ */
.lb {
  position: fixed; inset: 0; z-index: 100;
  display: grid; grid-template-rows: 1fr auto;
  background: rgba(12, 10, 9, 0.94);
  opacity: 0; visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.lb.is-open { opacity: 1; visibility: visible; }
.lb__stage {
  position: relative;
  display: grid; place-items: center;
  padding: clamp(1rem, 4vw, 3rem);
  min-height: 0;
}
.lb__img {
  max-width: 100%; max-height: 82vh;
  object-fit: contain;
  border-radius: 2px;
  box-shadow: 0 30px 80px -30px rgba(0,0,0,0.8);
  opacity: 0; transform: scale(0.985);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}
.lb__img.is-shown { opacity: 1; transform: none; }
.lb__caption {
  color: rgba(255,255,255,0.72);
  text-align: center;
  padding: 0 1.4rem 1.6rem;
  font-size: 0.9rem; letter-spacing: 0.02em;
}
.lb__count { color: rgba(255,255,255,0.5); font-variant-numeric: tabular-nums; }
.lb__btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 3.2rem; height: 3.2rem;
  display: grid; place-items: center;
  border: 1px solid rgba(255,255,255,0.28);
  background: rgba(255,255,255,0.06);
  color: #fff; border-radius: 50%;
  font-size: 1.3rem; cursor: pointer;
  transition: background 0.25s ease, transform 0.25s ease;
}
.lb__btn:hover { background: rgba(255,255,255,0.18); }
.lb__btn:active { transform: translateY(-50%) scale(0.94); }
.lb__prev { left: clamp(0.6rem, 2vw, 1.6rem); }
.lb__next { right: clamp(0.6rem, 2vw, 1.6rem); }
.lb__close {
  position: absolute; top: 1rem; right: 1rem;
  width: 2.8rem; height: 2.8rem; transform: none;
}
.lb__close:active { transform: scale(0.94); }
@media (max-width: 560px) {
  .lb__btn { width: 2.7rem; height: 2.7rem; }
}

/* ---- Motion preferences -------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1 !important; transform: none !important; transition: none; }
  .photo__img, .photo__frame, .lb, .lb__img { transition: none !important; }
  [data-parallax] { transform: none !important; }
}