/* 媧石皇家 demo 2 — 水晶探索 (crystals.html)
   Editorial intro · need swipe strip · specimen-room catalogue (filter rail / mobile sheet, search, FLIP grid) · close */

:root { --xp-edge: max(var(--gutter), calc((100vw - 1440px) / 2 + var(--gutter))); }

/* ---------- 1. Intro ---------- */
.xp-intro { padding-top: calc(var(--hd-h) + clamp(48px, 7vw, 112px)); padding-bottom: clamp(64px, 8vw, 120px); }
.xp-intro__grid { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); gap: 48px clamp(40px, 6vw, 120px); align-items: center; }
.xp-intro__txt { display: grid; gap: clamp(24px, 2.6vw, 36px); justify-items: start; }
.xp-intro__h { max-width: 11em; }
.xp-intro__h .accent { font-style: normal; }
.xp-intro__lead { max-width: 30em; }
.xp-stats { display: flex; flex-wrap: wrap; gap: 0; margin-top: 8px; border-top: 1px solid var(--line); width: 100%; max-width: 560px; }
.xp-stats > div { flex: 1 1 0; min-width: 0; padding: 20px 20px 0 0; }
.xp-stats > div + div { padding-left: 20px; border-left: 1px solid var(--line); }
.xp-stats dt { font-size: var(--fs-label); letter-spacing: .2em; color: var(--muted); }
.xp-stats dd { display: flex; align-items: baseline; gap: 6px; margin-top: 6px; }
.xp-stats .num { font-size: clamp(2.2rem, 3.4vw, 3.2rem); line-height: 1; color: var(--ink); }
.xp-stats small { font-size: var(--fs-small); color: var(--muted); }
.xp-intro__fig { align-self: stretch; display: flex; flex-direction: column; justify-content: flex-end; }
.xp-intro__media { aspect-ratio: 4 / 5; max-height: min(66vh, 620px); width: 100%; min-height: 0; }
.xp-intro__cap { display: flex; align-items: center; gap: 10px; }
.xp-intro__cap::before { content: ""; width: 20px; height: 1px; background: var(--brass); }

/* ---------- 2. Need strip ---------- */
.xp-needs { padding-block: clamp(56px, 7vw, 104px); border-top: 1px solid var(--line); }
.xp-needs__head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: clamp(32px, 4vw, 52px); }
.xp-needs__head > div:first-child { display: grid; gap: 18px; }
.xp-strip-nav { display: flex; gap: 10px; }
.xp-arrow { width: 52px; height: 52px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; transition: background .35s, color .35s, border-color .35s, opacity .3s; }
.xp-arrow svg { width: 20px; height: 20px; }
.xp-arrow:hover:not(:disabled) { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.xp-arrow:disabled { opacity: .35; cursor: default; }
.xp-strip { overflow-x: auto; overflow-y: hidden; scroll-snap-type: x mandatory; scroll-padding-inline: var(--xp-edge); scrollbar-width: none; overscroll-behavior-x: contain; cursor: grab; }
.xp-strip::-webkit-scrollbar { display: none; }
.xp-strip.is-drag { cursor: grabbing; scroll-snap-type: none; }
.xp-strip.is-drag a { pointer-events: none; }
.xp-strip:focus-visible { outline-offset: -2px; }
.xp-strip__track { display: flex; gap: 20px; width: max-content; padding-inline: var(--xp-edge); }
.xp-need { flex: none; width: clamp(256px, 23vw, 330px); scroll-snap-align: start; }
.xp-need__a {
  position: relative; display: grid; grid-template-rows: auto auto 1fr auto; gap: 14px; height: 100%; min-height: clamp(320px, 27vw, 380px);
  padding: clamp(22px, 2vw, 30px); border: 1px solid var(--line); border-radius: var(--r); background: var(--paper);
  transition: background-color .55s var(--ease), color .55s var(--ease), border-color .55s var(--ease); user-select: none; -webkit-user-drag: none;
}
.xp-need__no { font-size: var(--fs-label); color: var(--muted); transition: color .55s; }
.xp-need__seal {
  width: 76px; height: 76px; display: grid; place-items: center; margin-block: 6px 10px; border: 1px solid var(--burgundy); border-radius: 4px;
  font: 400 2.25rem/1 var(--f-zh-serif); color: var(--burgundy); transition: background-color .55s var(--ease), color .55s var(--ease), border-color .55s;
}
.xp-need__name { font: 400 var(--fs-h3)/1.4 var(--f-zh-serif); letter-spacing: .08em; }
.xp-need__desc { font-size: var(--fs-small); line-height: 1.8; color: var(--muted); transition: color .55s; }
.xp-need__more { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 16px; border-top: 1px solid var(--line); font-size: var(--fs-label); letter-spacing: .14em; transition: border-color .55s; }
.xp-need__more .num { font-size: 1rem; margin-right: 2px; }
.xp-need__more i { position: relative; width: 28px; height: 1px; background: currentColor; transition: width .45s var(--ease); }
.xp-need__more i::after { content: ""; position: absolute; right: 0; top: -3px; width: 7px; height: 7px; border-top: 1px solid currentColor; border-right: 1px solid currentColor; transform: rotate(45deg); }
.xp-need__a:hover, .xp-need__a:focus-visible { background: var(--burgundy-deep); border-color: var(--burgundy-deep); color: var(--on-dark); }
.xp-need__a:hover .xp-need__seal, .xp-need__a:focus-visible .xp-need__seal { background: var(--on-dark); border-color: var(--on-dark); color: var(--burgundy-deep); }
.xp-need__a:hover .xp-need__desc, .xp-need__a:hover .xp-need__no, .xp-need__a:focus-visible .xp-need__desc { color: var(--on-dark-muted); }
.xp-need__a:hover .xp-need__more { border-color: rgba(244, 237, 227, .2); }
.xp-need__a:hover .xp-need__more i { width: 44px; }
.xp-strip-progress { position: relative; height: 1px; margin-top: 32px; background: var(--line); overflow: hidden; }
.xp-strip-progress span { position: absolute; inset: 0; background: var(--ink); transform-origin: 0 50%; transform: scaleX(.3); transition: transform .25s linear; }

/* ---------- 3. Catalogue ---------- */
.xp-cat { padding-top: clamp(64px, 8vw, 120px); background: var(--paper); border-top: 1px solid var(--line); }
.xp-cat > .wrap { padding-bottom: clamp(64px, 8vw, 128px); }
.xp-cat__head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 16px 32px; margin-bottom: clamp(32px, 4vw, 56px); }
.xp-cat__grid { display: grid; grid-template-columns: 272px minmax(0, 1fr); gap: clamp(32px, 4vw, 72px); align-items: start; }

/* Filter rail (desktop) */
.xp-rail { position: sticky; top: calc(var(--hd-h) + 20px); display: flex; flex-direction: column; max-height: calc(100vh - var(--hd-h) - 40px); }
.xp-rail__hd { display: flex; align-items: center; justify-content: space-between; padding-bottom: 14px; }
.xp-rail__title { font: 500 var(--fs-label)/1.4 var(--f-sans); letter-spacing: .32em; color: var(--burgundy); }
.xp-rail__close { display: none; }
.xp-rail__body { overflow-y: auto; overscroll-behavior: contain; scrollbar-width: thin; scrollbar-color: var(--line) transparent; padding-right: 6px; margin-right: -6px; }
.xp-rail__ft { display: none; }
.xp-group { padding-block: 20px 24px; border-top: 1px solid var(--line); }
.xp-group__h { display: flex; align-items: center; justify-content: space-between; min-height: 32px; margin-bottom: 12px; font: 400 1.0625rem/1.4 var(--f-zh-serif); letter-spacing: .14em; }
.xp-group__reset { min-height: 32px; padding: 0 2px; font: 400 var(--fs-label)/1 var(--f-sans); letter-spacing: .1em; color: var(--muted); border-bottom: 1px solid currentColor; }
.xp-group__reset:hover { color: var(--burgundy); }
.xp-group__opts--chip { display: flex; flex-wrap: wrap; gap: 8px; }
.xp-group__opts--swatch { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px; }
.xp-group__opts--row { display: grid; }

.xp-opt { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-size: var(--fs-small); letter-spacing: .06em; text-align: left; transition: background-color .3s, color .3s, border-color .3s, opacity .3s; }
.xp-opt__n { font-size: .75rem; color: var(--muted); transition: color .3s; }
.xp-opt--chip { padding: 0 14px; border: 1px solid var(--line); border-radius: 99px; }
.xp-opt--chip:hover { border-color: var(--ink); }
.xp-opt--chip[aria-pressed="true"] { background: var(--burgundy); border-color: var(--burgundy); color: #fff; }
.xp-opt--chip[aria-pressed="true"] .xp-opt__n { color: rgba(255, 255, 255, .72); }
.xp-opt--swatch { width: 100%; padding: 0 8px; border: 1px solid transparent; border-radius: var(--r); }
.xp-opt--swatch .swatch { flex: none; width: 18px; height: 18px; transition: box-shadow .3s; }
.xp-opt--swatch .xp-opt__t { flex: 1; min-width: 0; white-space: nowrap; }
.xp-opt--swatch .xp-opt__n { display: none; }
.xp-opt--swatch:hover { background: var(--sand); }
.xp-opt--swatch[aria-pressed="true"] { border-color: var(--burgundy); background: var(--burgundy-tint); color: var(--burgundy); }
.xp-opt--swatch[aria-pressed="true"] .swatch { box-shadow: 0 0 0 2px var(--paper), 0 0 0 3px var(--burgundy); }
.xp-opt--row { width: 100%; justify-content: space-between; padding: 0 2px; border-bottom: 1px dashed var(--line); }
.xp-opt--row .xp-opt__t { position: relative; padding-left: 18px; transition: padding .35s var(--ease); }
.xp-opt--row .xp-opt__t::before { content: ""; position: absolute; left: 0; top: 50%; width: 8px; height: 8px; margin-top: -4px; border: 1px solid var(--line); border-radius: 50%; transition: background .3s, border-color .3s; }
.xp-opt--row:hover .xp-opt__t { padding-left: 22px; }
.xp-opt--row[aria-pressed="true"] { color: var(--burgundy); }
.xp-opt--row[aria-pressed="true"] .xp-opt__t::before { background: var(--burgundy); border-color: var(--burgundy); }
.xp-opt.is-zero { opacity: .42; }

/* Results bar */
.xp-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 32px; }
.xp-search { position: relative; flex: 1 1 340px; min-width: 0; border-bottom: 1px solid var(--ink); }
.xp-search__ico { position: absolute; left: 0; top: 50%; width: 22px; height: 22px; margin-top: -11px; color: var(--muted); pointer-events: none; }
.xp-search__in {
  width: 100%; min-height: 56px; padding: 10px 48px 10px 36px; border: 0; border-radius: 0; background: transparent; color: var(--ink);
  font: 400 clamp(1.05rem, 1.4vw, 1.3rem)/1.4 var(--f-zh-serif); letter-spacing: .06em; -webkit-appearance: none; appearance: none;
}
.xp-search__in::placeholder { color: #8f857b; opacity: 1; }
.xp-search__in:focus { outline: none; }
.xp-search:focus-within { border-bottom-color: var(--burgundy); box-shadow: 0 1px 0 var(--burgundy); }
.xp-search__in::-webkit-search-cancel-button, .xp-search__in::-webkit-search-decoration { -webkit-appearance: none; appearance: none; }
.xp-search__clear[hidden] { display: none; }
.xp-search__clear { position: absolute; right: 0; top: 50%; width: 44px; height: 44px; margin-top: -22px; display: grid; place-items: center; color: var(--muted); }
.xp-search__clear svg { width: 20px; height: 20px; }
.xp-search__clear:hover { color: var(--burgundy); }
.xp-bar__meta { display: flex; align-items: center; gap: 20px; }
.xp-count { font-size: var(--fs-small); letter-spacing: .1em; color: var(--muted); white-space: nowrap; }
.xp-count b { font-weight: 400; font-size: 1.35rem; color: var(--ink); margin-inline: 2px; }
.xp-sort select {
  min-height: 44px; padding: 0 40px 0 18px; border: 1px solid var(--line); border-radius: 99px; color: var(--ink); cursor: pointer;
  font: 400 var(--fs-small)/1 var(--f-sans); letter-spacing: .06em; -webkit-appearance: none; appearance: none;
  background: transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 9l6 6 6-6' fill='none' stroke='%2326201C' stroke-width='1.4'/%3E%3C/svg%3E") no-repeat right 14px center / 16px;
}
.xp-sort select:hover { border-color: var(--ink); }

.xp-active { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin-top: 20px; }
.xp-active[hidden] { display: none; }
.xp-active__list { display: flex; flex-wrap: wrap; gap: 8px; }
.xp-pill { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 12px 0 16px; border-radius: 99px; background: var(--burgundy-tint); color: var(--burgundy); font-size: var(--fs-small); letter-spacing: .06em; transition: background .3s, color .3s; }
.xp-pill svg { width: 16px; height: 16px; }
.xp-pill .swatch { width: 14px; height: 14px; }
.xp-pill:hover { background: var(--burgundy); color: #fff; }
.xp-textbtn { min-height: 44px; padding: 0 2px; font-size: var(--fs-small); letter-spacing: .1em; color: var(--muted); text-decoration: underline; text-underline-offset: 5px; text-decoration-color: var(--line); }
.xp-textbtn:hover { color: var(--burgundy); text-decoration-color: currentColor; }

/* Specimen grid */
.xp-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); grid-auto-flow: row dense; gap: clamp(40px, 3.6vw, 64px) clamp(18px, 2vw, 32px); margin-top: clamp(32px, 3.4vw, 48px); }
.xp-grid[hidden] { display: none; }
.xp-card { min-width: 0; }
.xp-card[hidden] { display: none; }
.xp-card__a { display: flex; flex-direction: column; height: 100%; }
.xp-card__media { aspect-ratio: 4 / 5; min-height: 0; flex: none; }
.xp-card__media img { transition: transform 1.2s var(--ease); }
.xp-card__a:hover .xp-card__media img { transform: scale(1.045); }
.xp-card__label { display: grid; gap: 6px; align-content: start; padding-top: 16px; }
.xp-card__top { display: flex; justify-content: space-between; gap: 12px; padding-bottom: 10px; border-bottom: 1px dotted var(--line); font-size: var(--fs-label); letter-spacing: .12em; color: var(--muted); }
.xp-card__top .num { color: var(--burgundy); letter-spacing: .06em; }
.xp-card__name { margin-top: 6px; font: 400 clamp(1.3rem, 1.7vw, 1.6rem)/1.35 var(--f-zh-serif); letter-spacing: .1em; }
.xp-card__name { background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat; transition: background-size .55s var(--ease), color .3s; justify-self: start; }
.xp-card__a:hover .xp-card__name { background-size: 100% 1px; color: var(--burgundy); }
.xp-card__lead, .xp-card__needs { display: none; }
.xp-card__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 16px; font-size: var(--fs-label); letter-spacing: .08em; color: var(--muted); }
.xp-card__col { display: inline-flex; align-items: center; gap: 8px; }
.xp-card__mohs .num { color: var(--ink); }

/* the wide "feature" specimen that sets the editorial rhythm */
.xp-card.is-wide { grid-column: span 2; }
.xp-card.is-wide-r { grid-column: 2 / span 2; }
.xp-card.is-wide .xp-card__a { flex-direction: row; gap: clamp(20px, 2.4vw, 40px); }
.xp-card.is-wide-r .xp-card__a { flex-direction: row-reverse; }
.xp-card.is-wide .xp-card__media { flex: 1.5 1 0; aspect-ratio: auto; min-height: clamp(320px, 30vw, 520px); }
.xp-card.is-wide .xp-card__label { flex: 1 1 0; min-width: 0; align-content: end; gap: 10px; padding: 0 0 4px; }
.xp-card.is-wide .xp-card__name { font-size: clamp(1.7rem, 2.6vw, 2.5rem); }
.xp-card.is-wide .xp-card__lead { display: block; font-size: var(--fs-small); line-height: 1.85; color: var(--muted); max-width: 22em; }
.xp-card.is-wide .xp-card__needs { display: block; margin-top: 4px; font-size: var(--fs-label); letter-spacing: .14em; color: var(--burgundy); }

/* Empty state */
.xp-empty { display: grid; justify-items: center; gap: 14px; margin-top: 40px; padding: clamp(48px, 6vw, 88px) 24px; border: 1px dashed var(--line); border-radius: var(--r-lg); text-align: center; }
.xp-empty[hidden] { display: none; }
.xp-empty__seal { width: 72px; height: 72px; display: grid; place-items: center; margin-bottom: 8px; border: 1px solid var(--burgundy); border-radius: 50%; font: 400 2rem/1 var(--f-zh-serif); color: var(--burgundy); }
.xp-empty .muted { max-width: 26em; font-size: var(--fs-small); }
.xp-empty__act { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 16px 28px; margin-top: 12px; }

/* Mobile filter trigger + sheet */
.xp-fab-wrap { display: none; }
.xp-scrim { position: fixed; inset: 0; z-index: 110; background: rgba(29, 24, 22, .46); animation: xpFade .4s var(--ease); }
.xp-scrim[hidden] { display: none; }
@keyframes xpFade { from { opacity: 0; } }
html.xp-lock { overflow: hidden; }

/* ---------- 4. Close ---------- */
.xp-close { padding-block: var(--sec); }
.xp-close__grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 48px clamp(40px, 6vw, 120px); align-items: center; }
.xp-close__media { aspect-ratio: 5 / 4; min-height: 0; }
.xp-close__txt { display: grid; gap: 28px; justify-items: start; }
.xp-close__act { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Responsive ---------- */
@media (max-width: 1199px) and (min-width: 992px) {
  .xp-cat__grid { grid-template-columns: 240px minmax(0, 1fr); }
  .xp-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xp-card.is-wide-r { grid-column: span 2; }
  .xp-card.is-wide .xp-card__a, .xp-card.is-wide-r .xp-card__a { flex-direction: row; }
}
@media (max-width: 991px) {
  .xp-intro__grid { grid-template-columns: minmax(0, 1fr); }
  .xp-intro__media { aspect-ratio: 4 / 3; max-height: none; }
  .xp-cat__grid { grid-template-columns: minmax(0, 1fr); }
  .xp-close__grid { grid-template-columns: minmax(0, 1fr); }

  /* filter rail becomes a bottom sheet */
  .xp-rail {
    position: fixed; left: 0; right: 0; bottom: 0; top: auto; z-index: 120; max-height: min(88vh, 88dvh); height: auto;
    background: var(--paper); border-radius: 18px 18px 0 0; box-shadow: 0 -20px 60px rgba(29, 24, 22, .18);
    transform: translateY(104%); visibility: hidden; transition: transform .55s var(--ease), visibility 0s linear .55s;
  }
  .xp-rail.is-open { transform: none; visibility: visible; transition: transform .55s var(--ease), visibility 0s; }
  .xp-rail::before { content: ""; position: absolute; top: 8px; left: 50%; width: 40px; height: 4px; margin-left: -20px; border-radius: 4px; background: var(--line); }
  .xp-rail__hd { padding: 20px var(--gutter) 12px; border-bottom: 1px solid var(--line); }
  .xp-rail__title { font: 400 1.25rem/1.4 var(--f-zh-serif); letter-spacing: .12em; color: var(--ink); }
  .xp-rail__close { display: grid; place-items: center; width: 44px; height: 44px; margin-right: -10px; }
  .xp-rail__close svg { width: 22px; height: 22px; }
  .xp-rail__body { flex: 1 1 auto; min-height: 0; padding: 0 var(--gutter); margin: 0; }
  .xp-group:first-child { border-top: 0; }
  .xp-group__opts--swatch { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xp-rail__ft { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px var(--gutter) calc(12px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line); background: var(--paper); }
  .xp-rail__apply { flex: 1; max-width: 280px; }
  .xp-rail__apply::after { display: none; }

  .xp-fab-wrap { position: sticky; bottom: 18px; z-index: 85; display: flex; justify-content: center; margin-top: -24px; padding-bottom: 18px; pointer-events: none; }
  .xp-fab { pointer-events: auto; display: inline-flex; align-items: center; gap: 10px; min-height: 50px; padding: 0 24px; border-radius: 99px; background: var(--ink); color: var(--paper); font-size: var(--fs-small); letter-spacing: .2em; box-shadow: 0 12px 30px rgba(29, 24, 22, .22); transition: transform .4s var(--ease), background .3s; }
  .xp-fab:hover { background: var(--burgundy-deep); }
  .xp-fab svg { width: 20px; height: 20px; }
  .xp-fab__n { display: grid; place-items: center; min-width: 22px; height: 22px; padding: 0 6px; border-radius: 99px; background: var(--burgundy); color: #fff; font-size: .75rem; font-weight: 400; letter-spacing: 0; }
  .xp-fab__n[hidden] { display: none; }
}
@media (max-width: 991px) and (min-width: 641px) {
  .xp-close__media { aspect-ratio: 16 / 9; }
}
@media (max-width: 640px) {
  .xp-intro { padding-top: calc(var(--hd-h) + 40px); }
  .xp-stats > div { padding-right: 12px; }
  .xp-stats > div + div { padding-left: 14px; }
  .xp-needs__head { align-items: flex-end; }
  .xp-strip-nav { display: none; }
  .xp-strip-progress { margin-top: 24px; }
  .xp-need { width: 74vw; max-width: 300px; }
  .xp-need__a { min-height: 320px; }
  .xp-bar { gap: 12px; }
  .xp-search { flex-basis: 100%; }
  .xp-bar__meta { width: 100%; justify-content: space-between; }
  .xp-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 36px 14px; }
  .xp-card__label { padding-top: 12px; gap: 4px; }
  .xp-card__top { flex-direction: column; gap: 2px; padding-bottom: 8px; font-size: .75rem; letter-spacing: .08em; }
  .xp-card__name { font-size: 1.15rem; letter-spacing: .06em; }
  .xp-card__meta { font-size: .75rem; gap: 2px 10px; letter-spacing: .04em; }
  .xp-card.is-wide, .xp-card.is-wide-r { grid-column: 1 / -1; }
  .xp-card.is-wide .xp-card__a, .xp-card.is-wide-r .xp-card__a { flex-direction: column; gap: 0; }
  .xp-card.is-wide .xp-card__media { flex: none; aspect-ratio: 3 / 2; min-height: 0; }
  .xp-card.is-wide .xp-card__label { padding-top: 14px; gap: 6px; }
  .xp-card.is-wide .xp-card__top { flex-direction: row; }
  .xp-card.is-wide .xp-card__name { font-size: 1.6rem; }
  .xp-close__media { aspect-ratio: 4 / 3; }
}