/* Hub: hero + progress, toolbar, card grid grouped by theme / year / concept. */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line-soft);
  background: radial-gradient(1200px 380px at 78% -10%, rgba(42, 156, 150, .22), transparent 70%), radial-gradient(900px 340px at 8% 0%, rgba(36, 79, 134, .3), transparent 70%), var(--bg); }
.hero-in { max-width: 1320px; margin: 0 auto; padding: calc(42px + env(safe-area-inset-top, 0px)) max(16px, env(safe-area-inset-right, 0px)) 30px max(16px, env(safe-area-inset-left, 0px)); }
.kicker { font-size: 12px; color: var(--muted); letter-spacing: .04em; }
.hero h1 { font: 700 clamp(30px, 5vw, 52px)/1.05 var(--display); letter-spacing: -.03em; margin: 10px 0 12px; }
.lede { max-width: 720px; color: #c7cfea; font-size: 16px; }
.stats { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 12px 16px; min-width: 150px; flex: 1 1 150px; max-width: 240px; }
.stat b { display: block; font: 700 26px/1 var(--display); letter-spacing: -.02em; }
.stat span { font: 400 11.5px var(--mono); color: var(--muted); }
.stat .bar { height: 4px; border-radius: 4px; background: var(--line-soft); margin-top: 10px; overflow: hidden; }
.stat .bar i { display: block; height: 100%; border-radius: 4px; }
main { max-width: 1320px; margin: 0 auto; padding: 22px max(16px, env(safe-area-inset-left, 0px)) 60px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; position: sticky; top: 0; z-index: 10; padding: 12px 0; background: linear-gradient(var(--bg) 70%, rgba(11, 14, 26, 0)); }
.search { flex: 1 1 280px; display: flex; align-items: center; gap: 8px; background: var(--panel-solid); border: 1px solid var(--line); border-radius: 999px; padding: 0 14px; color: var(--muted); }
.search svg { width: 17px; height: 17px; flex: none; }
.search input { flex: 1; background: none; border: 0; outline: 0; padding: 11px 0; font-size: 14.5px; min-width: 0; color: var(--ink); }
.seg { display: inline-flex; gap: 2px; background: var(--panel-solid); border: 1px solid var(--line); border-radius: 999px; padding: 3px; }
.seg button { font: 500 13px var(--display); color: var(--muted); background: none; border: 0; padding: 8px 14px; border-radius: 999px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.cmpbtn { font: 600 13px var(--display); background: var(--panel-solid); border: 1px solid var(--line); border-radius: 999px; padding: 9px 15px; cursor: pointer; }
.cmpbtn[aria-pressed="true"] { border-color: var(--ball); color: var(--ball); }
.filters { display: flex; flex-wrap: wrap; gap: 6px 14px; margin: 2px 0 20px; align-items: center; }
.fgroup { display: flex; flex-wrap: wrap; gap: 5px; align-items: center; }
.fgroup > span { font: 400 11px var(--mono); color: var(--faint); margin-right: 2px; }
.fchip { font: 500 12px var(--mono); color: var(--muted); background: none; border: 1px solid var(--line); border-radius: 999px; padding: 5px 10px; cursor: pointer; }
.fchip[aria-pressed="true"] { color: var(--bg); background: var(--ink); border-color: var(--ink); }
.group { margin-bottom: 34px; }
.group h2 { font: 700 19px var(--display); letter-spacing: -.01em; display: flex; align-items: baseline; gap: 10px; margin-bottom: 4px; }
.group h2 span { font: 400 12px var(--mono); color: var(--muted); }
.group .gsub { color: var(--muted); font-size: 13.5px; margin-bottom: 14px; max-width: 760px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 14px; }
.card { position: relative; display: flex; flex-direction: column; text-decoration: none; background: var(--bg-2); border: 1px solid var(--line-soft); border-radius: var(--r); overflow: hidden; transition: border-color .15s, transform .15s; }
.card:hover { border-color: var(--line); transform: translateY(-2px); }
.card .th { aspect-ratio: 16 / 10; background: #0b0e1a; position: relative; overflow: hidden; }
.card .th img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .4s; }
.card:hover .th img { transform: scale(1.04); }
.card .ph-art { position: absolute; inset: 0; display: grid; place-items: center; }
.card .ph-art svg { width: 70%; opacity: .45; }
.card .ph-art .k { position: absolute; bottom: 10px; left: 12px; font: 400 11px var(--mono); color: var(--faint); }
.card .th .chip { position: absolute; top: 10px; left: 10px; background: rgba(11, 14, 26, .78); backdrop-filter: blur(4px); }
.card .body { padding: 12px 14px 14px; display: grid; gap: 6px; flex: 1; align-content: start; }
.card h3 { font: 600 14.5px/1.32 var(--display); color: var(--ink); }
.card .by { font: 400 11.5px var(--mono); color: var(--muted); }
.card .res { font-size: 12.5px; color: #aeb7d6; line-height: 1.45; }
.card .tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 2px; }
.card .tags span { font: 400 10.5px var(--mono); color: var(--faint); border: 1px solid var(--line-soft); border-radius: 5px; padding: 2px 6px; }
.card.pick { outline: 2px solid var(--ball); outline-offset: 2px; }
.card .pickmark { position: absolute; top: 10px; right: 10px; width: 24px; height: 24px; border-radius: 50%; border: 2px solid var(--ink); background: rgba(11, 14, 26, .7); display: none; place-items: center; font: 700 12px var(--mono); }
body.comparing .card[data-visual="1"] .pickmark { display: grid; }
body.comparing .card[data-visual="0"] { opacity: .35; pointer-events: none; }
.card.pick .pickmark { background: var(--ball); border-color: var(--ball); color: #1a0d08; }
.year { display: grid; grid-template-columns: 74px minmax(0, 1fr); gap: 16px; margin-bottom: 18px; }
.year .y { font: 700 22px var(--display); color: var(--muted); position: sticky; top: 70px; align-self: start; }
.year .y small { display: block; font: 400 11px var(--mono); color: var(--faint); }
.concepts { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.concepts button { font: 500 12.5px var(--mono); color: var(--muted); background: var(--bg-2); border: 1px solid var(--line); border-radius: 999px; padding: 7px 12px; cursor: pointer; }
.concepts button b { color: var(--ink); margin-left: 6px; }
.concepts button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.concepts button[aria-pressed="true"] b { color: var(--bg); }
.cpapers { display: grid; gap: 8px; }
.crow { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; text-decoration: none; background: var(--bg-2); border: 1px solid var(--line-soft); border-radius: 12px; padding: 12px 14px; }
.crow:hover { border-color: var(--line); }
.crow b { font-weight: 600; }
.crow span { font: 400 12px var(--mono); color: var(--muted); }
.crow em { font: 600 12px var(--mono); font-style: normal; color: var(--ball); }
.empty { color: var(--muted); padding: 40px 0; text-align: center; }
.cmpbar { position: fixed; left: 50%; bottom: calc(18px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%); z-index: 20; display: flex; gap: 12px; align-items: center; background: var(--panel-solid); border: 1px solid var(--line); border-radius: 999px; padding: 8px 8px 8px 18px; box-shadow: 0 16px 50px rgba(0, 0, 0, .5); max-width: calc(100% - 32px); }
.cmpbar span { font: 500 13px var(--display); color: var(--muted); }
.act { font: 700 13.5px var(--display); background: var(--ball); color: #1a0d08; border-radius: 999px; padding: 10px 16px; text-decoration: none; white-space: nowrap; }
.act[aria-disabled="true"] { opacity: .4; pointer-events: none; }
.cmpbar .x { background: none; border: 0; color: var(--muted); font-size: 22px; padding: 0 8px; cursor: pointer; }
.foot { max-width: 1320px; margin: 0 auto; padding: 20px 16px 50px; border-top: 1px solid var(--line-soft); color: var(--faint); font: 400 12px/1.7 var(--mono); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
.foot a { color: var(--muted); }
@media (max-width: 640px) {
  .hero-in { padding-top: 28px; }
  .stat { min-width: calc(50% - 6px); }
  .toolbar { position: static; }
  .seg { flex: 1; } .seg button { flex: 1; padding: 8px 6px; }
  .year { grid-template-columns: 1fr; gap: 6px; } .year .y { position: static; }
  .grid { grid-template-columns: 1fr; }
}