/* Five ways of keeping something: dossiers, records, frames, files, equipment. */
.platform-section.collection-section { padding: 100px 7vw; }
.collection-section .section-heading { margin-bottom: 38px; }
.collection-band { --collection-accent: var(--ice); display: grid; grid-template-columns: minmax(190px, 23%) minmax(0, 1fr); border-block: 1px solid var(--line-strong); background: color-mix(in srgb, var(--bg) 88%, transparent); }
.collection-types { min-width: 0; padding: 20px 22px 20px 0; border-right: 1px solid var(--line); }
.collection-section .collection-types :is(button, a) { position: relative; display: grid; grid-template-columns: 22px minmax(0, 1fr) auto; align-items: center; gap: 12px; width: 100%; min-height: 62px; padding: 12px 12px 12px 16px; border: 0; border-bottom: 1px solid var(--line); background: transparent; color: var(--ink-dim); text-align: left; text-decoration: none; cursor: pointer; transition: color 160ms, background-color 160ms; }
.collection-types :is(button, a)::before { position: absolute; inset: 16px auto 16px 0; width: 2px; background: transparent; content: ''; }
.collection-types :is(button, a):hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 4%, transparent); }
.collection-types button[aria-pressed="true"] { color: var(--ink); background: color-mix(in srgb, var(--ice) 7%, transparent); }
.collection-types button[aria-pressed="true"]::before { background: var(--ice); }
.collection-types .collection-type-label { font-size: 14px; font-weight: 600; line-height: 1.5; }
.collection-types :is(.collection-type-number, small) { color: var(--ink-faint); font: 400 var(--fs-micro)/1.5 var(--font-mono); font-variant-numeric: tabular-nums; }
.collection-types small { text-align: right; }
.collection-section :is(button, a):focus-visible { outline: 2px solid var(--ice); outline-offset: 3px; }
.collection-output { min-width: 0; padding: 28px 32px; }
.collection-panel { min-width: 0; scroll-margin-top: 100px; }
.collection-panel[hidden] { display: none; }
.collection-panel + .collection-panel:not([hidden]) { margin-top: 44px; }
.collection-band.is-enhanced .collection-panel { margin-top: 0; }
.collection-panel--game { --collection-accent: var(--signal-text); }
.collection-panel--music { --collection-accent: var(--ice); }
.collection-panel--film-anime { --collection-accent: var(--ink-dim); }
.collection-panel--reading { --collection-accent: var(--amber); }
.collection-panel--tool { --collection-accent: var(--ink-dim); }
.collection-panel-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.collection-panel-heading p { margin: 0 0 8px; color: var(--ink-faint); font: 400 var(--fs-micro)/1.5 var(--font-mono); letter-spacing: .08em; }
.collection-panel-heading h3 { margin: 0; color: var(--ink); font: 500 25px/1.4 var(--font-serif); }
.collection-panel-heading > span { flex-shrink: 0; color: var(--ink-faint); font-size: 12px; line-height: 1.8; }
.collection-vacant { display: grid; grid-template-columns: minmax(120px, 38%) minmax(0, 1fr); align-items: center; gap: 30px; min-height: 260px; padding: 24px 0; }
.collection-vacant-mark { display: grid; place-items: center; color: color-mix(in srgb, var(--collection-accent) 52%, var(--bg)); }
.collection-vacant-mark svg { width: min(100%, 180px); height: auto; }
.collection-vacant-copy h4 { margin: 0 0 12px; font: 500 16px/1.5 var(--font-sans); color: var(--ink-dim); }
.collection-vacant-copy p { max-width: 24em; margin: 0; font-size: 13px; line-height: 1.9; color: var(--ink-faint); }
.collection-vacant-rule { display: block; width: 32px; margin-top: 24px; border-top: 1px solid var(--collection-accent); opacity: .6; }
.collection-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; padding-top: 24px; }
.collection-item { min-width: 0; }
.collection-item-media { min-width: 0; margin-bottom: 16px; }
.collection-item-cover { display: block; width: 100%; height: auto; aspect-ratio: 16 / 10; background: var(--panel); }
.collection-item-placeholder { display: grid; place-items: center; aspect-ratio: 16 / 10; border: 1px solid var(--line); color: var(--ink-faint); }
.collection-item-placeholder svg { width: 70px; opacity: .6; }
.collection-item-meta { display: flex; flex-wrap: wrap; gap: 8px 14px; color: var(--ink-faint); font-size: 11px; }
.collection-item-meta > :first-child { font-family: var(--font-mono); color: var(--collection-accent); }
.collection-item h4 { margin: 9px 0 12px; font: 500 22px/1.4 var(--font-serif); overflow-wrap: anywhere; }
.collection-item p { margin: 0 0 16px; color: var(--ink-dim); font-size: 13px; line-height: 1.9; white-space: pre-line; overflow-wrap: anywhere; }
.collection-item-body > a { display: inline-block; padding-block: 10px; color: var(--ink); font-size: 12px; text-underline-offset: 5px; }
.collection-item .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.collection-item-tag { display: block; color: var(--ink-faint); font-size: 11px; margin-bottom: 6px; }
/* 曲目是一份频谱清单：宽屏两列、封面缩小，四十多首曲目不必拉出近万像素的长条。 */
.collection-panel--music .collection-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 40px; }
.collection-panel--music .collection-item { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 22px; border-bottom: 1px solid var(--line); padding-block: 20px; }
.collection-panel--music .collection-item h4 { margin: 6px 0 8px; font-size: 19px; }
.collection-panel--music .collection-item p { margin-bottom: 6px; }
.collection-panel--music :is(.collection-item-cover, .collection-item-placeholder) { aspect-ratio: 1; }
.collection-panel--film-anime .collection-list { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; padding-top: 12px; border-top: 3px double var(--line-strong); margin-top: 24px; }
.collection-panel--film-anime .collection-item h4 { font-size: 19px; }
.collection-panel--reading .collection-list, .collection-panel--tool .collection-list { grid-template-columns: 1fr; gap: 0; }
.collection-panel--reading .collection-item { display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.collection-panel--reading :is(.collection-item-cover, .collection-item-placeholder) { aspect-ratio: 2 / 3; border-left: 3px solid var(--line-strong); }
.collection-panel--tool .collection-item { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.collection-panel--tool :is(.collection-item-cover, .collection-item-placeholder) { aspect-ratio: 1; }
.collection-panel--tool .collection-item-placeholder svg { width: 28px; }
.collection-panel--tool .collection-item h4 { font: 600 17px/1.5 var(--font-sans); }
.collection-no-types { margin: 20px 0; color: var(--ink-dim); }
@media (max-width: 1100px) {
  .collection-panel--music .collection-list { grid-template-columns: 1fr; }
}
@media (max-width: 960px) {
  .platform-section.collection-section { padding: 80px 6vw; }
  .collection-band { grid-template-columns: 1fr; }
  .collection-types { display: flex; flex-wrap: wrap; gap: 0 14px; padding: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .collection-section .collection-types :is(button, a) { width: auto; flex: 1 0 auto; min-height: 56px; border-bottom: 0; padding-inline: 10px; gap: 8px; }
  .collection-types :is(button, a)::before { inset: auto 10px 0; width: auto; height: 2px; }
  .collection-output { padding: 28px 22px; }
}
@media (max-width: 560px) {
  .platform-section.collection-section { padding-block: 64px; }
  .collection-section .section-heading { margin-bottom: 28px; }
  .collection-types { display: grid; grid-template-columns: 1fr 1fr; gap: 0; padding-block: 8px; }
  .collection-section .collection-types :is(button, a) { width: 100%; min-height: 48px; grid-template-columns: 18px minmax(0, 1fr) auto; gap: 5px; padding-inline: 9px; }
  .collection-types .collection-type-label { font-size: 13px; }
  .collection-types :is(button, a)::before { inset: 12px auto 12px 0; width: 2px; height: auto; }
  .collection-output { padding: 24px 16px; }
  .collection-panel-heading { align-items: center; gap: 10px; padding-bottom: 18px; }
  .collection-panel-heading h3 { font-size: 23px; }
  .collection-panel-heading p { font-size: var(--fs-micro); letter-spacing: .025em; }
  .collection-panel-heading > span { font-size: 11px; }
  .collection-vacant { grid-template-columns: 84px minmax(0, 1fr); gap: 18px; min-height: 210px; }
  .collection-vacant-copy h4 { font-size: 14px; }
  .collection-vacant-copy p { font-size: 12px; }
  .collection-list { grid-template-columns: 1fr; }
  .collection-panel--music .collection-item { grid-template-columns: 64px minmax(0, 1fr); gap: 16px; padding-block: 16px; }
  .collection-panel--film-anime .collection-list { grid-template-columns: 1fr; gap: 24px; }
  .collection-panel--reading .collection-item { grid-template-columns: 62px minmax(0, 1fr); gap: 18px; }
}
@media (prefers-reduced-motion: reduce) { .collection-types :is(button, a) { transition: none; } }