/* pair — 신구조문대비표 콘셉트: 두 칸 대비표, 형광펜 두 색(A 노랑 · B 하늘), 빨간펜 채점 */
:root {
  --paper: #F3F3EF; --paper-2: #EAEBE5; --sheet: #FFFFFF;
  --ink: #17191E; --ink-2: #474B53; --ink-3: #7D8189; --rule: #DBDCD5; --rule-2: #C9CAC2;
  --hl-a: rgba(247, 219, 79, .62); --hl-b: rgba(128, 199, 238, .55);
  --hl-a-solid: #F5D94A; --hl-b-solid: #86C8EE; --hl-a-soft: rgba(247, 219, 79, .16); --hl-b-soft: rgba(128, 199, 238, .16);
  --pen: #D0352A; --pen-soft: rgba(208, 53, 42, .08);
  --sans: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  --doc: 'Gowun Batang', 'AppleMyungjo', 'Nanum Myeongjo', 'Batang', serif;
  --r: 12px; --r-sm: 8px; --bar: 60px; --safe-b: env(safe-area-inset-bottom, 0px);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #131418; --paper-2: #1A1C21; --sheet: #1C1E23;
    --ink: #ECECE7; --ink-2: #B7B9BE; --ink-3: #85888F; --rule: #2E3137; --rule-2: #3B3F46;
    --hl-a: rgba(236, 205, 72, .34); --hl-b: rgba(110, 185, 232, .32);
    --hl-a-solid: #D9BD3E; --hl-b-solid: #5FA9D6; --hl-a-soft: rgba(236, 205, 72, .1); --hl-b-soft: rgba(110, 185, 232, .1);
    --pen: #FF6B5E; --pen-soft: rgba(255, 107, 94, .1);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; font: 15px/1.6 var(--sans); color: var(--ink); letter-spacing: -.005em; word-break: keep-all; overflow-wrap: anywhere;
  background: radial-gradient(90% 55% at 0% 0%, var(--hl-a-soft), transparent 60%), radial-gradient(80% 50% at 100% 0%, var(--hl-b-soft), transparent 60%), linear-gradient(180deg, var(--paper), var(--paper-2));
  background-attachment: fixed; -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; text-align: inherit; -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; border-radius: 6px; }
.sr, .skip:not(:focus) { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip:focus { position: fixed; top: 8px; left: 8px; z-index: 50; background: var(--ink); color: var(--paper); padding: 8px 12px; border-radius: 8px; }
.ic { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.nojs { padding: 40px 20px; text-align: center; }

/* highlighter */
.ma, .mb { padding: 0 .12em; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.ma { background: linear-gradient(176deg, transparent 52%, var(--hl-a) 52%, var(--hl-a) 90%, transparent 91%); }
.mb { background: linear-gradient(184deg, transparent 52%, var(--hl-b) 52%, var(--hl-b) 90%, transparent 91%); }

/* red pen */
.pen { position: absolute; left: -10px; top: -10px; width: calc(100% + 20px); height: calc(100% + 20px); fill: none; stroke: var(--pen); stroke-width: 2.7; stroke-linecap: round; pointer-events: none; overflow: visible; }
.pen path { stroke-dasharray: 1; stroke-dashoffset: 1; animation: draw .45s cubic-bezier(.55, .1, .3, 1) .05s forwards; }
.pen-x { stroke-width: 2.9; }
@keyframes draw { to { stroke-dashoffset: 0; } }

/* shell */
/* no backdrop-filter on .top: it would become the containing block of the fixed bottom nav inside it */
.top { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 12px; height: 56px; padding: 0 12px 0 16px; background: color-mix(in srgb, var(--paper) 96%, transparent); border-bottom: 1px solid var(--rule); }
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; font: 700 22px/1 var(--doc); letter-spacing: -.01em; }
.mark { width: 28px; height: 28px; }
.mark rect:first-child { fill: var(--hl-a-solid); }
.mark rect:last-child { fill: var(--hl-b-solid); mix-blend-mode: multiply; }
@media (prefers-color-scheme: dark) { .mark rect:last-child { mix-blend-mode: screen; } }
.top-act { margin-left: auto; display: flex; gap: 2px; }
.icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; color: var(--ink-2); }
.icon-btn:hover { background: var(--paper-2); color: var(--ink); }
.icon-btn.on { color: var(--ink); }
.icon-btn.on .ic { fill: var(--hl-a-solid); stroke: var(--ink); }
.icon-btn.sm { width: 34px; height: 34px; }
.keys-only { display: none; }
.rail { position: fixed; z-index: 20; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: repeat(4, 1fr); height: calc(var(--bar) + var(--safe-b)); padding-bottom: var(--safe-b); background: color-mix(in srgb, var(--sheet) 92%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-top: 1px solid var(--rule); }
.rail button { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; font-size: 12px; font-weight: 600; color: var(--ink-3); }
.rail button.on { color: var(--ink); }
.rail button.on .ic { stroke-width: 2.2; }
.rail em { position: absolute; top: 6px; left: calc(50% + 6px); min-width: 17px; height: 17px; padding: 0 5px; border-radius: 9px; background: var(--pen); color: #fff; font: 700 10.5px/17px var(--sans); font-style: normal; text-align: center; }
main { display: block; max-width: 760px; margin: 0 auto; padding: 16px 16px calc(var(--bar) + var(--safe-b) + 28px); outline: none; }
body[data-view="play"] .rail { display: none; }
body[data-view="play"] .top { display: none; }
body[data-view="play"] main { padding-top: 0; padding-bottom: calc(var(--safe-b) + 24px); }

@media (min-width: 960px) {
  body { display: grid; grid-template-columns: 232px 1fr; }
  .top { position: sticky; top: 0; height: 100vh; flex-direction: column; align-items: stretch; gap: 22px; padding: 26px 16px; border-bottom: 0; border-right: 1px solid var(--rule); background: transparent; }
  body[data-view="play"] .top { display: flex; }
  .brand { padding: 0 8px; }
  .rail, body[data-view="play"] .rail { position: static; display: flex; flex-direction: column; gap: 2px; height: auto; padding: 0; background: none; border: 0; backdrop-filter: none; -webkit-backdrop-filter: none; }
  .rail button { flex-direction: row; justify-content: flex-start; gap: 12px; height: 42px; padding: 0 10px; border-radius: 10px; font-size: 15px; }
  .rail button:hover { background: var(--paper-2); color: var(--ink); }
  .rail button.on { background: var(--sheet); box-shadow: inset 0 0 0 1px var(--rule); }
  .rail em { position: static; margin-left: auto; }
  .top-act { margin: auto 0 0; }
  .keys-only { display: inline-grid; }
  main, body[data-view="play"] main { width: 100%; max-width: 1080px; padding: 32px 40px 64px; margin: 0; }
  .home, .play, .page:not(.lib) { max-width: 720px; }
}

/* common */
.h-page { margin: 6px 0 14px; font: 700 26px/1.25 var(--doc); letter-spacing: -.02em; }
.h-sec { margin: 30px 0 10px; font-size: 14px; font-weight: 700; color: var(--ink-2); }
.hint { margin: 8px 0 0; font-size: 13px; color: var(--ink-3); }
.warn { margin: 12px 0 0; font-size: 13px; color: var(--pen); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 18px; border-radius: var(--r); border: 1px solid var(--rule-2); background: var(--sheet); font-weight: 650; font-size: 15px; }
.btn:hover { border-color: var(--ink-3); }
.btn.primary { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn.primary:hover { opacity: .9; }
.btn .ic { width: 18px; height: 18px; }
.chips { display: flex; gap: 6px; overflow-x: auto; margin: 0 -16px; padding: 2px 16px 4px; scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
.chip { flex: none; display: inline-flex; align-items: center; gap: 6px; height: 34px; padding: 0 13px; border-radius: 17px; border: 1px solid var(--rule); background: var(--sheet); font-size: 14px; font-weight: 600; color: var(--ink-2); }
.chip span { font-size: 12px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.chip.on { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.chip.on span { color: color-mix(in srgb, var(--paper) 70%, transparent); }
@media (min-width: 960px) { .chips { margin: 0; padding: 2px 0 4px; flex-wrap: wrap; } }
.empty { padding: 40px 12px; text-align: center; }
.empty h2 { margin: 0 0 6px; font: 700 19px/1.4 var(--doc); }
.empty p { margin: 0 0 18px; color: var(--ink-3); font-size: 14px; }
.foot { margin: 44px 0 0; text-align: center; font-size: 12px; color: var(--ink-3); }
.foot p { margin: 4px 0; }
.foot a { text-decoration: none; }
.foot a:hover { text-decoration: underline; }
.toast { position: fixed; z-index: 60; left: 50%; bottom: calc(var(--bar) + var(--safe-b) + 14px); transform: translateX(-50%); padding: 10px 16px; border-radius: 10px; background: var(--ink); color: var(--paper); font-size: 14px; font-weight: 600; box-shadow: 0 8px 24px rgba(0, 0, 0, .18); }
body[data-view="play"] .toast { bottom: calc(var(--safe-b) + 88px); }
@media (min-width: 960px) { .toast { bottom: 28px; } }

/* home */
.today { display: flex; justify-content: space-between; gap: 12px; margin: 2px 0 12px; font-size: 13px; color: var(--ink-3); }
.resume { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 2px 12px; width: 100%; margin: 14px 0 0; padding: 14px 16px; border-radius: var(--r); background: var(--ink); color: var(--paper); }
.resume-k { grid-column: 1; font-size: 12.5px; opacity: .72; }
.resume-t { grid-column: 1; font-weight: 700; font-size: 16px; }
.resume-n { grid-column: 2; grid-row: 1 / 3; font-variant-numeric: tabular-nums; font-weight: 700; }
.resume .ic { grid-column: 3; grid-row: 1 / 3; }
.daily { position: relative; display: block; width: 100%; margin: 12px 0 0; padding: 18px 18px 22px; border-radius: var(--r); border: 1px solid var(--rule); background: var(--sheet); overflow: hidden; }
.daily-k { display: block; font: 700 21px/1.3 var(--doc); letter-spacing: -.01em; }
.daily-t { display: block; margin-top: 4px; font-size: 14px; color: var(--ink-2); }
.daily-bar { position: absolute; left: 0; right: 0; bottom: 0; height: 5px; background: var(--paper-2); }
.daily-bar i { display: block; height: 100%; background: var(--hl-a-solid); }
.daily:hover { border-color: var(--rule-2); }
.daily.done .daily-k { text-decoration: line-through; text-decoration-color: var(--pen); text-decoration-thickness: 2px; }
.modes { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.mode { display: flex; flex-direction: column; gap: 3px; padding: 15px 16px; border-radius: var(--r); border: 1px solid var(--rule); background: var(--sheet); }
.mode:hover { border-color: var(--rule-2); }
.mode b { font-size: 17px; }
.mode span { font-size: 13px; line-height: 1.45; color: var(--ink-2); }
.mode em { margin-top: auto; padding-top: 8px; font-style: normal; font-size: 12.5px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.mode-case, .mode-quiz { min-height: 128px; }
.mode-case b { align-self: flex-start; } .mode-case b, .mode-quiz b { font: 700 20px/1.3 var(--doc); }
.mode-case b { background: linear-gradient(176deg, transparent 55%, var(--hl-a) 55%, var(--hl-a) 92%, transparent 93%); padding: 0 .1em; }
.mode-quiz b { align-self: flex-start; background: linear-gradient(184deg, transparent 55%, var(--hl-b) 55%, var(--hl-b) 92%, transparent 93%); padding: 0 .1em; }
.mode-vs, .mode-link, .mode-rush { grid-column: 1 / -1; display: grid; grid-template-columns: 96px 1fr auto; align-items: baseline; gap: 10px; padding: 13px 16px; }
.mode-vs b, .mode-link b, .mode-rush b { font-size: 15.5px; }
.mode-vs em, .mode-link em, .mode-rush em { margin: 0; padding: 0; }
.review-cta { display: flex; align-items: center; gap: 10px; width: 100%; margin: 14px 0 0; padding: 13px 16px; border-radius: var(--r); background: var(--pen-soft); color: var(--ink); font-size: 15px; }
.review-cta .ic:first-child { color: var(--pen); }
.review-cta b { color: var(--pen); }
.review-cta .ic:last-child { margin-left: auto; color: var(--ink-3); }

/* play */
.play-head { position: sticky; top: 0; z-index: 10; display: grid; grid-template-columns: 40px 1fr auto; align-items: center; gap: 8px; margin: 0 -16px; padding: 8px 16px 6px 8px; background: color-mix(in srgb, var(--paper) 90%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.ph-t { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.ph-t b { font-size: 15px; }
.ph-t span { font-size: 12.5px; color: var(--ink-3); }
.ph-n { font-size: 14px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.ph-n b { font-size: 17px; color: var(--ink); }
.mono { font-variant-numeric: tabular-nums; }
.pips { display: flex; gap: 3px; margin: 0 0 16px; padding: 0; list-style: none; }
.pips li { flex: 1; height: 3px; border-radius: 2px; background: var(--rule); }
.pips li.ok { background: var(--ink); }
.pips li.no { background: var(--pen); }
.pips li.cur { background: var(--ink-3); }
.rushbar { height: 4px; margin: 0 0 16px; background: var(--rule); border-radius: 2px; overflow: hidden; }
.rushbar i { display: block; height: 100%; background: var(--ink); transition: width .1s linear; }
.rushbar i.low { background: var(--pen); }
@media (min-width: 960px) { .play-head { margin: 0 0 0; padding: 0 0 8px; background: none; backdrop-filter: none; -webkit-backdrop-filter: none; position: static; } }
.levels { display: flex; gap: 4px; margin: 0 0 14px; padding: 3px; border-radius: 10px; background: var(--paper-2); }
.lv { flex: 1; height: 32px; border-radius: 8px; font-size: 13.5px; font-weight: 600; color: var(--ink-2); }
.lv.on { background: var(--sheet); color: var(--ink); box-shadow: 0 1px 2px rgba(0, 0, 0, .08); }
.q-meta { display: flex; align-items: center; gap: 8px; margin: 0 0 10px; font-size: 12.5px; color: var(--ink-3); }
.q-meta .icon-btn { margin-left: auto; }
.subj { font-weight: 700; color: var(--ink-2); }
.lvl { padding: 1px 7px; border-radius: 5px; border: 1px solid var(--rule-2); font-weight: 600; }
.lvl.l4 { border-color: var(--ink-3); color: var(--ink-2); }
.facts { padding: 16px 18px; border-radius: var(--r); border: 1px solid var(--rule); background: var(--sheet); font: 16.5px/1.85 var(--doc); letter-spacing: -.01em; word-break: keep-all; }
.stmts { margin: 10px 0 0; padding: 12px 16px; list-style: none; border-radius: var(--r); background: var(--paper-2); font: 15px/1.7 var(--doc); }
.stmts li { display: grid; grid-template-columns: 24px 1fr; gap: 4px; padding: 3px 0; }
.stmts b { font-family: var(--sans); }
.ask { margin: 20px 0 12px; font-size: 17px; line-height: 1.5; font-weight: 700; outline: none; word-break: keep-all; }
.desc { margin: 4px 0 18px; font: 400 20px/1.7 var(--doc); letter-spacing: -.015em; outline: none; word-break: keep-all; }
.opts { display: grid; gap: 8px; }
.opt { position: relative; display: grid; grid-template-columns: 30px 1fr; align-items: start; gap: 12px; width: 100%; min-height: 52px; padding: 13px 15px 13px 13px; border-radius: var(--r); border: 1px solid var(--rule); background: var(--sheet); font-size: 15.5px; line-height: 1.55; transition: border-color .12s; word-break: keep-all; }
.opt:not(:disabled):hover { border-color: var(--ink-3); }
.opt:disabled { cursor: default; }
.opt .k { position: relative; display: grid; place-items: center; width: 28px; height: 28px; margin-top: -1px; border-radius: 50%; border: 1.5px solid var(--rule-2); font-size: 13px; font-weight: 700; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.opt .t { padding-top: 2px; }
.opt.right { border-color: var(--ink-3); }
.opt.right .t > span { background: linear-gradient(176deg, transparent 55%, var(--hl-a) 55%, var(--hl-a) 92%, transparent 93%); -webkit-box-decoration-break: clone; box-decoration-break: clone; padding: 0 .1em; }
.opt.right .k { border-color: transparent; color: var(--pen); }
.opt.wrong .k { color: var(--ink-3); }
.opt.wrong .t { color: var(--ink-3); text-decoration: line-through; text-decoration-color: var(--pen); text-decoration-thickness: 1.5px; }
.opt.dim { opacity: .55; }
.opts.two { grid-template-columns: 1fr 1fr; }
.opts.two .opt { grid-template-columns: 1fr; justify-items: center; text-align: center; gap: 8px; padding: 18px 12px; min-height: 96px; font: 700 18px/1.4 var(--doc); }
.opts.two .opt.sa { border-top: 4px solid var(--hl-a-solid); }
.opts.two .opt.sb { border-top: 4px solid var(--hl-b-solid); }
.opts.two .opt .t { padding: 0; }
.nextbar { position: sticky; bottom: 0; z-index: 5; margin: 18px -16px 0; padding: 14px 16px calc(14px + var(--safe-b)); background: linear-gradient(180deg, transparent, var(--paper) 30%); }
.nextbar .btn { width: 100%; min-height: 52px; font-size: 16px; }
@media (min-width: 960px) { .nextbar { position: static; margin: 22px 0 0; padding: 0; background: none; } .nextbar .btn { width: auto; min-width: 200px; } }

/* explanation */
.explain { margin: 22px 0 0; padding: 18px 0 0; border-top: 1px dashed var(--rule-2); }
.verdict { display: flex; align-items: center; gap: 10px; margin: 0 0 12px; font-size: 16px; font-weight: 700; }
.verdict.no { color: var(--pen); }
.flag { display: inline-flex; align-items: center; gap: 5px; margin-left: auto; height: 32px; padding: 0 11px; border-radius: 16px; border: 1px solid var(--rule); background: var(--sheet); font-size: 12.5px; font-weight: 600; color: var(--ink-2); }
.flag .ic { width: 15px; height: 15px; }
.flag.on { border-color: var(--pen); color: var(--pen); }
.rule { margin: 0 0 14px; font: 17px/1.85 var(--doc); letter-spacing: -.01em; word-break: keep-all; }
.rule mark { color: inherit; background: linear-gradient(176deg, transparent 50%, var(--hl-a) 50%, var(--hl-a) 90%, transparent 91%); -webkit-box-decoration-break: clone; box-decoration-break: clone; padding: 0 .1em; }
.why-mine { margin: 0 0 12px; padding: 12px 14px; border-radius: var(--r-sm); background: var(--pen-soft); }
.why-mine span { display: block; margin-bottom: 2px; font-size: 12.5px; font-weight: 700; color: var(--pen); }
.why-mine p { margin: 0; font-size: 14.5px; line-height: 1.65; }
.more { margin: 0 0 8px; border-radius: var(--r-sm); border: 1px solid var(--rule); background: var(--sheet); }
.more summary { display: flex; align-items: center; justify-content: space-between; min-height: 44px; padding: 0 14px; list-style: none; cursor: pointer; font-size: 14px; font-weight: 650; }
.more summary::-webkit-details-marker { display: none; }
.more summary .ic { width: 18px; height: 18px; color: var(--ink-3); transition: transform .15s; }
.more[open] summary .ic { transform: rotate(180deg); }
.whys { margin: 0; padding: 0 14px 10px; list-style: none; }
.whys li { display: grid; grid-template-columns: 38px 1fr; gap: 6px; padding: 8px 0; border-top: 1px solid var(--rule); font-size: 14px; line-height: 1.65; }
.whys li b { font-variant-numeric: tabular-nums; color: var(--ink-3); }
.whys li.is-ans b { color: var(--pen); }
.whys p { margin: 0; }
.trap { display: grid; grid-template-columns: auto 1fr; gap: 10px; margin: 12px 0; font-size: 14.5px; line-height: 1.65; }
.trap span, .dt-foot span, .links-k { flex: none; font-size: 12.5px; font-weight: 700; color: var(--ink-3); padding-top: 1px; }
.links { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 12px 0 0; }
.links a { display: inline-flex; align-items: baseline; gap: 6px; min-height: 34px; padding: 6px 10px; border-radius: var(--r-sm); border: 1px solid var(--rule); background: var(--sheet); text-decoration: none; font-size: 13px; line-height: 1.35; }
.links a:hover { border-color: var(--ink-3); }
.links a span { color: var(--ink-3); }
.links a .ic { width: 13px; height: 13px; align-self: center; color: var(--ink-3); }
.related { display: grid; gap: 6px; margin: 14px 0 0; }
.rel { display: flex; align-items: center; gap: 6px; padding: 11px 14px; border-radius: var(--r-sm); border: 1px solid var(--rule); background: var(--sheet); font-weight: 650; }
.rel i { font-style: normal; color: var(--ink-3); }
.rel .ic { margin-left: auto; width: 17px; height: 17px; color: var(--ink-3); }
.disclose { margin: 16px 0 0; font-size: 12px; color: var(--ink-3); }

/* 대비표 */
.dt { margin: 4px 0 0; border: 1.5px solid var(--ink); border-radius: 6px; background: var(--sheet); overflow: hidden; }
.dt-row { display: grid; grid-template-columns: 1fr 1fr; }
.dt-row > div { padding: 12px 13px; min-width: 0; }
.dt-row > div + div { border-left: 1px solid var(--rule-2); }
.dt-head { border-bottom: 1px solid var(--ink); background: var(--paper); }
.dt-head > div { display: flex; align-items: baseline; gap: 7px; font: 700 16.5px/1.4 var(--doc); word-break: keep-all; }
.dt-head i { flex: none; font: 700 11px/1 var(--sans); font-style: normal; color: var(--ink-3); }
.dt-row .doc { font: 15px/1.75 var(--doc); letter-spacing: -.01em; word-break: keep-all; }
.dt-row .dt-a.focus { background: var(--hl-a-soft); }
.dt-row .dt-b.focus { background: var(--hl-b-soft); }
.dt-foot { display: grid; grid-template-columns: auto 1fr; gap: 10px; padding: 11px 13px; border-top: 1px solid var(--rule-2); background: var(--paper); }
.dt-foot p { margin: 0; font-size: 14.5px; line-height: 1.65; }
.dt-src { padding: 10px 13px 12px; border-top: 1px solid var(--rule-2); }
.dt-src .cite { display: block; font-size: 12.5px; color: var(--ink-3); }
.dt-src .links { margin-top: 8px; }
.concept-ex .dt { margin-top: 2px; }

/* link */
.board { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: 10px 22px; }
.wires { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; fill: none; stroke: var(--pen); stroke-width: 2.2; stroke-linecap: round; overflow: visible; }
.col { display: grid; gap: 8px; align-content: start; }
.li { display: grid; grid-template-columns: 14px 1fr; align-items: start; gap: 7px; width: 100%; min-height: 56px; padding: 10px 10px 10px 9px; border-radius: var(--r); border: 1px solid var(--rule); background: var(--sheet); font-size: 14.5px; line-height: 1.5; word-break: keep-all; }
.li.l { font-weight: 700; align-items: center; }
.li.r .doc { font: 14px/1.6 var(--doc); }
.li .k { font-size: 12px; font-weight: 700; color: var(--ink-3); padding-top: 2px; }
.li.sel { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.li.matched { opacity: .72; border-style: dashed; }
.link-note { min-height: 3.2em; margin: 14px 0 0; font-size: 14px; line-height: 1.6; color: var(--ink-2); }

/* rush */
.rush-start { padding: 34px 8px 10px; text-align: center; }
.rush-60 { font: 700 104px/1 var(--doc); letter-spacing: -.04em; }
.rush-60.paused { color: var(--ink-3); }
.rush-start p { margin: 14px auto 0; max-width: 30em; color: var(--ink-2); }
.rush-start .best { color: var(--ink-3); font-size: 14px; }
.rush-start .btn { margin-top: 26px; min-width: 180px; }
.rush-q .q-ins b { color: var(--ink); font-variant-numeric: tabular-nums; }

/* result */
.result { padding: 24px 0 0; text-align: center; }
.score { position: relative; display: inline-flex; align-items: baseline; gap: 6px; padding: 18px 34px 12px; }
.score .num { font: 700 88px/1 var(--doc); letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
.score .den { font: 700 26px/1 var(--doc); color: var(--ink-3); }
.pen-o.big { left: -4%; top: -14%; width: 108%; height: 128%; stroke-width: 2.4; }
.score-sub { margin: 12px 0 0; color: var(--ink-2); }
.lv-sum { display: flex; justify-content: center; gap: 16px; margin: 8px 0 0; font-size: 13.5px; color: var(--ink-3); }
.lv-sum b { color: var(--ink); font-variant-numeric: tabular-nums; }
.res-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin: 24px 0 8px; }
.result .h-sec, .result .miss { text-align: left; }

/* lists */
.miss, .sets { margin: 0; padding: 0; list-style: none; border-radius: var(--r); border: 1px solid var(--rule); background: var(--sheet); overflow: hidden; }
.miss li { display: flex; align-items: stretch; }
.miss li + li, .sets li + li { border-top: 1px solid var(--rule); }
.miss li > button:first-child { flex: 1; display: flex; align-items: center; gap: 10px; min-height: 56px; padding: 10px 14px; text-align: left; }
.miss li > button:first-child:hover { background: var(--paper); }
.miss li > button > span { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.miss b { font-weight: 650; word-break: keep-all; }
.miss small { font-size: 12.5px; color: var(--ink-3); }
.miss .ic { margin-left: auto; width: 17px; height: 17px; color: var(--ink-3); }
.miss .x { display: grid; place-items: center; width: 48px; border-left: 1px solid var(--rule); color: var(--ink-3); }
.miss .x:hover { color: var(--pen); }
.miss .x .ic { margin: 0; }
.rv-start { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 14px 0 0; }
.rv-btn { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 0 8px; padding: 16px; border-radius: var(--r); background: var(--ink); color: var(--paper); }
.rv-btn b { font: 700 19px/1.3 var(--doc); }
.rv-btn span { grid-column: 1; font-size: 13px; opacity: .75; font-variant-numeric: tabular-nums; }
.rv-btn .ic { grid-column: 2; grid-row: 1 / 3; }
.rv-btn:disabled { background: var(--paper-2); color: var(--ink-3); cursor: default; }

/* library */
.search { display: flex; align-items: center; gap: 8px; height: 48px; margin: 0 0 10px; padding: 0 12px; border-radius: var(--r); border: 1px solid var(--rule-2); background: var(--sheet); }
.search:focus-within { border-color: var(--ink); }
.search .ic { color: var(--ink-3); }
.search input { flex: 1; min-width: 0; height: 100%; border: 0; outline: 0; background: none; font-size: 16px; }
.search kbd { display: none; }
@media (min-width: 960px) { .search kbd { display: inline-block; padding: 1px 7px; border: 1px solid var(--rule-2); border-radius: 5px; font: 12px/1.5 var(--sans); color: var(--ink-3); } }
.tabs { display: flex; gap: 16px; margin: 12px 0 4px; border-bottom: 1px solid var(--rule); }
.tab { position: relative; height: 38px; font-size: 14px; font-weight: 650; color: var(--ink-3); }
.tab.on { color: var(--ink); }
.tab.on::after { content: ''; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: var(--ink); }
.count { margin: 10px 0 8px; font-size: 12.5px; color: var(--ink-3); }
.rows { margin: 0; padding: 0; list-style: none; }
.row { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2px 10px; width: 100%; padding: 12px 4px; border-bottom: 1px solid var(--rule); text-align: left; }
.row-t { font-weight: 650; font-size: 15.5px; line-height: 1.5; word-break: keep-all; }
.row-t i { margin: 0 6px; font-style: normal; color: var(--ink-3); font-weight: 400; }
.row-m { grid-column: 1; font-size: 12.5px; color: var(--ink-3); }
.row .fav { grid-column: 2; grid-row: 1 / 3; width: 16px; height: 16px; fill: var(--hl-a-solid); stroke: var(--ink-2); }
.row.on { background: var(--sheet); box-shadow: inset 3px 0 0 var(--ink); padding-left: 12px; }
.row:hover { background: color-mix(in srgb, var(--sheet) 60%, transparent); }
.btn.more { width: 100%; margin: 14px 0 0; }
.lib-detail:empty { display: none; }
@media (min-width: 960px) {
  .lib-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: 32px; align-items: start; }
  .lib-detail { position: sticky; top: 28px; }
}
.note-top { display: flex; align-items: center; justify-content: space-between; margin: 0 0 8px; }
.note-act { display: flex; }
.note-stat { margin: 12px 0 0; font-size: 13px; color: var(--ink-3); }
.note-go { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0; }
.note-go .btn { flex: 1 1 auto; }

/* sheet */
#sheet { width: 100%; max-width: 100%; max-height: 90vh; margin: auto 0 0; padding: 0; border: 0; border-radius: 16px 16px 0 0; background: var(--paper); color: var(--ink); box-shadow: 0 -10px 40px rgba(0, 0, 0, .2); }
#sheet::backdrop { background: rgba(10, 12, 16, .42); }
#sheet[open] { animation: up .22s cubic-bezier(.2, .8, .2, 1); }
@keyframes up { from { transform: translateY(24px); opacity: .4; } }
.sheet-bar { position: sticky; top: 0; z-index: 2; display: flex; align-items: center; justify-content: space-between; padding: 8px 8px 4px 18px; background: var(--paper); font-size: 13px; font-weight: 700; color: var(--ink-3); }
.sheet-body { padding: 4px 16px calc(22px + var(--safe-b)); }
@media (min-width: 720px) { #sheet { max-width: 640px; margin: auto; border-radius: 16px; } }
.keys-list { margin: 0 0 8px; }
.keys-list div { display: flex; justify-content: space-between; gap: 12px; padding: 11px 2px; border-bottom: 1px solid var(--rule); font-size: 14.5px; }
.keys-list dt { color: var(--ink-2); }
.keys-list dd { margin: 0; }
kbd { display: inline-block; min-width: 22px; padding: 0 6px; border: 1px solid var(--rule-2); border-bottom-width: 2px; border-radius: 5px; background: var(--sheet); font: 600 12.5px/1.6 var(--sans); text-align: center; }

/* progress */
.stat3 { display: grid; grid-template-columns: .8fr 1fr 1fr; margin: 14px 0 0; border-radius: var(--r); border: 1px solid var(--rule); background: var(--sheet); }
.stat3 > div { display: flex; flex-direction: column; gap: 2px; padding: 14px 14px 12px; min-width: 0; }
.stat3 > div + div { border-left: 1px solid var(--rule); }
.stat3 span { font-size: 12.5px; color: var(--ink-3); }
.stat3 b { font: 700 26px/1.2 var(--doc); font-variant-numeric: tabular-nums; }
.stat3 b small { font: 600 13px var(--sans); margin-left: 2px; color: var(--ink-3); }
.stat3 > div > small { font-size: 12px; color: var(--ink-3); }
.bars { display: grid; grid-template-columns: repeat(14, 1fr); gap: 5px; height: 132px; padding: 12px 12px 8px; border-radius: var(--r); border: 1px solid var(--rule); background: var(--sheet); }
.bar { display: flex; flex-direction: column; align-items: center; gap: 5px; min-width: 0; }
.bar-v { flex: 1; display: flex; flex-direction: column-reverse; width: 100%; max-width: 18px; border-radius: 3px; background: var(--paper-2); overflow: hidden; }
.bar-v i { display: block; width: 100%; }
.bc { background: var(--ink); } .bp { background: var(--hl-b-solid); }
.bar span { font-size: 10.5px; color: var(--ink-3); font-variant-numeric: tabular-nums; white-space: nowrap; }
.bar.today span { color: var(--ink); font-weight: 700; }
.legend { display: flex; align-items: center; gap: 6px; margin: 8px 0 0; font-size: 12.5px; color: var(--ink-3); }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-left: 8px; }
.legend i:first-child { margin-left: 0; }
.lc { background: var(--ink); } .lp { background: var(--hl-b-solid); }
.subj-table { border: 1.5px solid var(--ink); border-radius: 6px; background: var(--sheet); overflow: hidden; }
.st-row { display: grid; grid-template-columns: 1.2fr 1fr 1fr; width: 100%; text-align: left; }
.st-row > span { display: flex; align-items: baseline; gap: 6px; padding: 11px 13px; font-variant-numeric: tabular-nums; }
.st-row > span + span { border-left: 1px solid var(--rule-2); }
.st-row small { font-size: 12px; color: var(--ink-3); }
button.st-row { border-top: 1px solid var(--rule); }
button.st-row:hover { background: var(--paper); }
.st-head { background: var(--paper); border-bottom: 1px solid var(--ink); font-size: 12.5px; font-weight: 700; color: var(--ink-3); }
.st-head + .st-row { border-top: 0; }
.sets li { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 11px 14px; }
.sets span { display: flex; flex-direction: column; font-weight: 650; }
.sets small { font-size: 12px; font-weight: 400; color: var(--ink-3); }
.sets b { font-variant-numeric: tabular-nums; }
.io { display: flex; gap: 8px; margin: 12px 0 0; }
.io .btn { flex: 1; }

@media (max-width: 380px) {
  .opts.two .opt { font-size: 16.5px; }
  .mode-vs, .mode-link, .mode-rush { grid-template-columns: 84px 1fr auto; }
  .board { gap: 8px 16px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .pen path { stroke-dashoffset: 0; }
}