/* ===== Top-Conf Figure Gallery ===== */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --ink: #141a2a;
  --ink-soft: #5b6478;
  --line: #e6e9f2;
  --iclr: #4f46e5;
  --icml: #0d9488;
  --neurips: #e11d48;
  --cvpr: #f97316;
  --acl: #2563eb;
  --aaai: #7c3aed;
  --accent: #4f46e5;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(28, 35, 51, .05);
}
* { box-sizing: border-box; }
button, input, select { font-family: inherit; }
[hidden] { display: none !important; }
html { scrollbar-gutter: stable; }
body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Hero (scrolls away) ---------- */
.hero {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.hero-inner { max-width: 1320px; margin: 0 auto; padding: 10px 28px; }
.hero-top { display: flex; align-items: center; gap: 12px; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 9px; min-width: 0; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 7px; flex-shrink: 0;
  background: var(--accent);
  display: grid; place-items: center;
}
.dot { width: 6px; height: 6px; border-radius: 50%; background: rgba(255,255,255,.92); display: inline-block; margin: 0 1.5px; }
h1 { margin: 0; font-size: 17px; letter-spacing: .2px; font-weight: 800; }
.hero-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.lang-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  height: 32px; padding: 0 11px; border: 1px solid #d9d4eb; border-radius: 7px;
  background: #f7f5ff; color: #5141a8;
  font: inherit; font-size: 12px; font-weight: 600; line-height: 1;
  white-space: nowrap; cursor: pointer; text-decoration: none;
}
.lang-toggle:hover {
  border-color: #b9addd; background: #eee9ff; text-decoration: none;
}

/* ---------- Sticky control bar ---------- */
.stickbar {
  position: sticky; top: 0; z-index: 40;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 4px 18px -14px rgba(28, 35, 51, .35);
}
.stickbar-inner { max-width: 1320px; margin: 0 auto; padding: 7px 28px 7px; display: flex; flex-direction: column; gap: 5px; }
.stick-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.search-box {
  flex: 1 1 220px; min-width: 0; display: flex; align-items: center; gap: 8px;
  background: #f8f9fb; border: 1px solid #edf0f5;
  border-radius: 10px; padding: 0 11px; color: #737d91;
}
.search-box:focus-within { border-color: rgba(79, 70, 229, .55); box-shadow: 0 0 0 3px rgba(79,70,229,.12); }
.search-box input {
  flex: 1; border: 0; outline: 0; background: transparent;
  padding: 8px 0; font-size: 13.5px; color: var(--ink); min-width: 0;
}
.clear-btn { border: 0; background: #eef0f7; color: #6b7488; width: 20px; height: 20px; border-radius: 5px; font-size: 14px; line-height: 1; cursor: pointer; flex-shrink: 0; }
.clear-btn:hover { background: #e2e5ef; color: var(--ink); }
.result-count { font-size: 12.5px; color: var(--ink-soft); white-space: nowrap; }
.result-count b { color: var(--ink); font-size: 13.5px; }
.sort-wrap { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-soft); white-space: nowrap; }
.filter-row { display: flex; gap: 14px; align-items: center; }
.view-controls { display: flex; align-items: center; gap: 14px; margin-left: auto; }
@media (max-width: 540px) { .filter-field.column-field { display: none; } }
.filter-field { display: flex; align-items: center; gap: 7px; font-size: 12px; color: var(--ink-soft); min-width: 0; }
:is(.filter-field, .sort-wrap) select {
  appearance: none;
  font: inherit; font-size: 13px; font-weight: 600; line-height: 1.5; color: #42396c;
  min-width: 0; height: 34px; padding: 6px 30px 6px 11px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  border: 1px solid #d2cbea; border-radius: 9px; cursor: pointer;
  background-color: #f7f5ff;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='m3 4.5 3 3 3-3' fill='none' stroke='%237468a5' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-position: right 10px center; background-repeat: no-repeat;
}
:is(.filter-field, .sort-wrap) select:hover { border-color: #a99bd7; background-color: #efebff; }
:is(.filter-field, .sort-wrap) select:focus-visible { outline: 2px solid #c9c2f4; outline-offset: 2px; }
.filter-field select[id$="-filter"]:has(option:checked:not([value="all"])) { color: #5141a8; border-color: #bfb1e8; background-color: #eee9ff; }
/* Native select semantics and keyboard support, with a styled picker where supported. */
@supports (appearance: base-select) {
  :is(.filter-field, .sort-wrap) select,
  :is(.filter-field, .sort-wrap) select::picker(select) { appearance: base-select; }
  :is(.filter-field, .sort-wrap) select { background-image: none; padding-right: 11px; gap: 16px; align-items: center; }
  :is(.filter-field, .sort-wrap) select::picker-icon {
    content: ""; width: 6px; height: 6px; margin-left: auto;
    border-right: 1.5px solid #7468a5; border-bottom: 1.5px solid #7468a5;
    transform: translateY(-2px) rotate(45deg);
  }
  :is(.filter-field, .sort-wrap) select:open { border-color: #a595d7; background-color: #eee9ff; }
  :is(.filter-field, .sort-wrap) select::picker(select) {
    margin-top: 5px; padding: 5px; min-width: 175px; max-height: 320px;
    overflow-y: auto; background: #fff; color: var(--ink);
    border: 1px solid #d8d0ed; border-radius: 11px;
    box-shadow: 0 8px 24px rgba(28,35,51,.12);
  }
  :is(.filter-field, .sort-wrap) option {
    min-height: 34px; padding: 7px 10px; border-radius: 6px;
    font-size: 13px; font-weight: 500; color: #46405c; line-height: 1.5; cursor: pointer; gap: 10px;
  }
  :is(.filter-field, .sort-wrap) option:checked { background: #e8e1ff; color: #5141a8; font-weight: 700; }
  :is(.filter-field, .sort-wrap) option:hover,
  :is(.filter-field, .sort-wrap) option:focus { background: #f0ecfa; outline: none; }
  :is(.filter-field, .sort-wrap) option::checkmark { color: #6554c0; }
}
@media (max-width: 540px) {
  .filter-row { gap: 6px; }
  .filter-field { flex: 1; flex-direction: column; align-items: stretch; gap: 4px; }
  .sort-wrap select { font-size: 11px; }
  .filter-field select { width: 100%; padding-left: 8px; padding-right: 22px; font-size: 11px; background-position: right 6px center; }
  @supports (appearance: base-select) {
    .filter-field select { padding-right: 8px; gap: 4px; }
  }
}

/* ---------- Gallery ---------- */
.container { max-width: 1320px; margin: 0 auto; padding: 14px 28px 60px; }
.masonry { column-count: var(--gallery-columns, 3); column-gap: 18px; }

@media (max-width: 540px)  { .masonry { column-count: 1; } .hero-inner { padding: 10px 16px; } .stickbar-inner { padding: 8px 16px 7px; } .container { padding: 14px 16px 40px; } .search-box { flex: 1 1 180px; } .result-count { order: 3; } }

.card {
  break-inside: avoid; margin-bottom: 18px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
  display: block; position: relative;
}
.card:hover { border-color: #b9c0d1; box-shadow: 0 2px 5px rgba(28, 35, 51, .07), 0 5px 12px rgba(28, 35, 51, .10); }

/* Static placeholders avoid repainting every unloaded card on every frame. */
.img-slot {
  position: relative; width: 100%; display: block; border: 0; padding: 0; cursor: zoom-in;
  background: #eef1f7;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.card-img {
  width: 100%; display: block; position: absolute; inset: 0;
  opacity: 0;
}
.card-img.loaded { opacity: 1; }
.img-slot.loaded { animation: none; background: #fff; }
.img-slot.img-failed { animation: none; background: #f3f4f8; }
.img-failed::after {
  content: "Image unavailable · 点击重试"; position: absolute; inset: 0;
  display: grid; place-items: center; font-size: 12px; color: #98a0b3;
}

.card.is-award { border-color: #fda4af; }
.card.is-award:hover { border-color: #fb7185; }
.card.is-oral { border-color: #fde68a; }
.card.is-oral:hover { border-color: #fbbf24; }

.badge.tier-badge { text-transform: none; letter-spacing: 0; font-weight: 400; }
.badge.rb-best, .badge.rb-honor { background: #f9eff2; color: #9b6373; border: 0; }
.badge.rb-oral { background: #f7f2e7; color: #8a7444; }
.badge.rb-spotlight { background: #edf0ff; color: #6375ac; }
.card-body { padding: 12px 14px 13px; cursor: text; user-select: text; }
.card-meta-text { font-size: 11px; font-weight: 400; color: #7b8290; }
.card-badges { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 7px; }
.badge {
  font-size: 11px; font-weight: 600; letter-spacing: .4px; text-transform: uppercase;
  padding: 2.5px 9px; border-radius: 5px; color: #fff;
}
.badge.iclr { background: #eeecff; color: #5144b5; }
.badge.icml { background: #e9f4f2; color: #28766d; }
.badge.neurips { background: #fbeef1; color: #ac405d; }
.badge.cvpr { background: #fff0e6; color: #ad571f; }
.badge.acl { background: #edf2fc; color: #3a61a0; }
.badge.aaai { background: #f1edfa; color: #72529d; }
.badge.year { background: #eef0f7; color: #59617a; text-transform: none; letter-spacing: 0; }
.badge.pattern { background: #fff4e6; color: #b45309; text-transform: none; letter-spacing: .3px; font-weight: 600; }
.card-title { margin: 0; font-size: 13.5px; line-height: 1.45; font-weight: 600; color: var(--ink);
  display: block; overflow-wrap: anywhere; }
.card-authors { margin: 6px 0 0; font-size: 11.5px; color: #697386;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card-link { margin-top: 8px; display: inline-flex; align-items: center; gap: 4px; font-size: 12px; font-weight: 600; }
.card-link-image, .card-link-open, .card-link-paper { display: inline-block; color: inherit; cursor: pointer; }
.card-link-image { border: 0; padding: 0; background: none; font: inherit; line-height: inherit; cursor: pointer; }
.card-link-image:hover, .card-link-open:hover, .card-link-paper:hover { text-decoration: underline; }

.empty-state { text-align: center; padding: 90px 20px; color: var(--ink-soft); }
.empty-emoji { font-size: 42px; margin-bottom: 10px; }
.ghost-btn, .primary-btn {
  display: inline-block; border-radius: 10px; padding: 9px 18px; font-size: 13.5px; cursor: pointer;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink); font-weight: 600;
}
.ghost-btn:hover { border-color: #c6ccdd; text-decoration: none; }
.primary-btn { background: var(--accent); border-color: var(--accent); color: #fff; }
.primary-btn:hover { text-decoration: none; filter: brightness(1.07); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: #fff; margin-top: 20px; }
.footer-inner { max-width: 1320px; margin: 0 auto; padding: 30px 28px 40px; display: grid; grid-template-columns: 1.7fr 1fr; gap: 40px; }
.site-footer h3 { font-size: 14px; margin: 0 0 10px; }
.site-footer p { font-size: 12.5px; color: var(--ink-soft); margin: 0 0 10px; }
.pattern-legend { list-style: none; padding: 0; margin: 0; font-size: 12.5px; color: var(--ink-soft); }
.pattern-legend li { padding: 2.5px 0; }
.pattern-legend b { color: var(--ink); font-family: ui-monospace, Consolas, monospace; }
.repo-note code { background: #f1f3f9; border-radius: 5px; padding: 1px 6px; font-size: 11.5px; }
@media (max-width: 760px) { .footer-inner { grid-template-columns: 1fr; gap: 22px; } }

/* ---------- Lightbox ---------- */
.lightbox { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 30px; }
.lightbox[hidden] { display: none; }
.lightbox-backdrop { position: absolute; inset: 0; background: rgba(20, 24, 36, .66); }
.lightbox-dialog {
  display: grid; grid-template-rows: minmax(0, 1fr);
  position: relative; background: #fff; border-radius: 18px; max-width: 1080px; width: 100%;
  max-height: 92vh; overflow: hidden; box-shadow: 0 40px 90px -20px rgba(0,0,0,.5);
}
.lightbox-content {
  display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(280px, 1fr);
  width: 100%; height: auto; min-height: 0; grid-template-rows: minmax(0, 1fr);
}
.lightbox-close {
  position: absolute; top: 10px; right: 12px; z-index: 2;
  width: 34px; height: 34px; border-radius: 8px; border: 0; cursor: pointer;
  background: rgba(255,255,255,.92); color: #333; font-size: 20px; line-height: 1;
  box-shadow: 0 2px 10px rgba(0,0,0,.18);
}
.lightbox-img-wrap { min-width: 0; min-height: 0; background: #fbfbfd; display: grid; grid-template: minmax(0, 1fr) / minmax(0, 1fr); place-items: center; padding: 18px; border-right: 1px solid var(--line); }
.lightbox-img-wrap img { max-width: 100%; max-height: min(78vh, 100%); object-fit: contain; border-radius: 8px; }
.lightbox-meta { min-width: 0; min-height: 0; overflow: auto; padding: 26px 24px; display: flex; flex-direction: column; gap: 12px; }
.lb-badges { display: flex; gap: 7px; flex-wrap: wrap; }
.lightbox-meta h2 { margin: 0; font-size: 17px; line-height: 1.4; }
.lb-authors { margin: 0; font-size: 13px; color: var(--ink-soft); }
.lb-actions { position: relative; margin-top: auto; display: flex; gap: 10px; flex-wrap: wrap; padding-top: 14px; }
@media (max-width: 860px) {
  .lightbox { padding: 12px; }
  .lightbox-dialog { max-height: 94vh; }
  .lightbox-content { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) auto; }
  .lightbox-img-wrap { border-right: 0; border-bottom: 1px solid var(--line); }
  .lightbox-img-wrap img { max-height: min(52vh, 100%); }
}

/* ===== infinite scroll + lightbox nav (v2) ===== */
.sentinel { text-align: center; padding: 28px 0 8px; color: var(--muted, #7a8196); font-size: 14px; }
.spinner {
  display: inline-block; width: 15px; height: 15px; margin-right: 8px; vertical-align: -2px;
  border: 2px solid #d7dbec; border-top-color: #5b6ee1; border-radius: 50%;
  animation: tc-spin .8s linear infinite;
}
@keyframes tc-spin { to { transform: rotate(360deg); } }
.end-hint { text-align: center; padding: 22px 0 40px; color: #9aa1b5; font-size: 13px; letter-spacing: .04em; }
.lightbox-nav {
  position: fixed; top: 50%; transform: translateY(-50%); z-index: 1001;
  width: 46px; height: 46px; padding: 0; border-radius: 10px; cursor: pointer;
  display: grid; place-items: center;
  border: 1px solid rgba(255, 255, 255, .78);
  background: rgba(255,255,255,.94); color: #303750;
  box-shadow: 0 8px 26px rgba(20,24,60,.24);
}
.lightbox-nav svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2.15; stroke-linecap: round; stroke-linejoin: round; }
.lightbox-nav:hover { background: #fff; color: var(--accent); }
.lightbox-nav.prev { left: 18px; }
.lightbox-nav.next { right: 18px; }

/* Live lightbox animation uses only compositor-friendly transform/opacity.
   No root snapshots or per-part width/height animation. Layers exist only while
   the Web Animations effects are active and are released after completion. */
.lightbox-dialog { transform-origin: top left; }
/* Fixed navigation is positioned against the viewport once the panel rests.
   Hide it during scaling, when a transform temporarily changes its containing block. */
html[data-figure-transition="opening"] .lightbox-nav,
html[data-figure-transition="closing"] .lightbox-nav { opacity: 0; pointer-events: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

:where(button, a, select, .card):focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

@media (max-width: 540px) {
  h1 { font-size: 15px; }
  .brand-mark { width: 24px; height: 24px; border-radius: 6px; }
  .lang-toggle { height: 28px; padding: 0 7px; font-size: 11px; }
  .stick-row { gap: 8px; }
  /* Keep the full filter set available without covering the gallery on scroll. */
  .stickbar { position: static; }
}

.img-slot:focus-visible { outline-offset: -3px; }

.card-badges .tier-badge { margin-left: auto; font-size: 11px; font-weight: 400; letter-spacing: 0; text-transform: none; padding: 1px 7px; }
@media (max-width: 540px) {
  .hero-right { gap: 4px; }
  .hero-top { gap: 8px; }
}

.masonry.images-only .card-body { display: none; }
.masonry.images-only .img-slot { border-bottom: 0; }
@media (max-width: 860px) {
  .filter-row { flex-wrap: wrap; }
}
@media (max-width: 540px) {
  .display-field select { width: auto; min-width: 112px; }
}

/* Use our accessible clear button without the browser's duplicate search control. */
#search::-webkit-search-cancel-button,
#search::-webkit-search-decoration { -webkit-appearance: none; appearance: none; display: none; }
@media (max-width: 1100px) {
  .filter-row { flex-wrap: wrap; }
  .view-controls { margin-left: 0; }
}
@media (max-width: 860px) {
  .view-controls { flex-basis: 100%; flex-wrap: wrap; justify-content: flex-start; gap: 10px; }
  .view-controls .display-field { margin-left: 0; flex: 0 0 auto; flex-direction: row; align-items: center; }
}

.brand-text { display: flex; align-items: baseline; flex-wrap: wrap; column-gap: 12px; row-gap: 1px; min-width: 0; }
.brand-description { font-size: 11px; font-weight: 400; color: #8a90a0; }
@media (max-width: 540px) { .brand-description { font-size: 10px; } }

@media (max-width: 860px) {
  .brand-description { display: none; }
}
@media (max-width: 540px) {
  .brand-mark { display: none; }
}