:root{--bg: #f4f6f8;--surface: #ffffff;--ink: #10242e;--ink-soft: #5b6b75;--line: #dbe3e8;--brand: #0b3f5c;--brand-soft: #e6eef3;--on-brand: #ffffff;--right: #1a7f4b;--right-soft: #e4f4ec;--on-right: #ffffff;--wrong: #b3261e;--wrong-soft: #fbe9e8;--on-wrong: #ffffff;--warn: #8a6100;--warn-soft: #fdf3dc;--scrim: rgba(16, 36, 46, .55);--radius: 14px;--tap: 48px}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--bg: #0e161b;--surface: #16242c;--ink: #eef4f7;--ink-soft: #9fb2bd;--line: #273a45;--brand: #7fc4e8;--brand-soft: #1b2f3a;--on-brand: #06222f;--right: #57d295;--right-soft: #14332a;--on-right: #06222f;--wrong: #ff9a92;--wrong-soft: #3a1e1d;--on-wrong: #2a0f0e;--warn: #f0c469;--warn-soft: #33290f;--scrim: rgba(4, 12, 17, .72)}}:root[data-theme=dark]{--bg: #0e161b;--surface: #16242c;--ink: #eef4f7;--ink-soft: #9fb2bd;--line: #273a45;--brand: #7fc4e8;--brand-soft: #1b2f3a;--on-brand: #06222f;--right: #57d295;--right-soft: #14332a;--on-right: #06222f;--wrong: #ff9a92;--wrong-soft: #3a1e1d;--on-wrong: #2a0f0e;--warn: #f0c469;--warn-soft: #33290f;--scrim: rgba(4, 12, 17, .72)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:Assistant,Rubik,Heebo,system-ui,-apple-system,Segoe UI,sans-serif;font-size:17px;line-height:1.6;-webkit-text-size-adjust:100%}button{font:inherit;color:inherit}.app{max-width:720px;margin:0 auto;padding:0 16px calc(32px + env(safe-area-inset-bottom))}a{color:var(--brand)}.brand{display:flex;align-items:center;gap:14px;margin:14px 0 4px}.brand img{flex-shrink:0}.sources{margin-top:20px}.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:12px;padding:12px 0;background:var(--bg);border-bottom:1px solid var(--line)}.topbar h1{margin:0;font-size:1.05rem;font-weight:700}.topbar .spacer{flex:1}.back{min-height:var(--tap);min-width:var(--tap);padding:0 14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);cursor:pointer}.back:hover{border-color:var(--brand)}.theme-cycle{padding:0;font-size:1.15rem;line-height:1}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:12px 0}.tile{display:block;width:100%;text-align:right;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:10px 0;min-height:var(--tap);cursor:pointer}.tile:hover{border-color:var(--brand)}.tile[disabled]{opacity:.55;cursor:default}.tile[disabled]:hover{border-color:var(--line)}.tile .title{font-weight:700;font-size:1.1rem}.tile .sub{color:var(--ink-soft);font-size:.92rem}.btn{min-height:var(--tap);padding:0 20px;border-radius:var(--radius);border:1px solid var(--brand);background:var(--brand);color:var(--on-brand);font-weight:600;cursor:pointer}.btn.ghost{background:var(--surface);color:var(--ink);border-color:var(--line)}.btn[disabled]{opacity:.5;cursor:default}.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.row.end{justify-content:flex-end}.options{display:grid;gap:10px;margin:16px 0}.option{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start;width:100%;text-align:right;min-height:var(--tap);padding:14px;border:1.5px solid var(--line);border-radius:var(--radius);background:var(--surface);cursor:pointer}.option:hover:not([disabled]){border-color:var(--brand)}.option .key{display:grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--brand-soft);color:var(--brand);font-weight:700}.option.picked{border-color:var(--brand);background:var(--brand-soft)}.option.right{border-color:var(--right);background:var(--right-soft)}.option.right .key{background:var(--right);color:var(--on-right)}.option.wrong{border-color:var(--wrong);background:var(--wrong-soft)}.option.wrong .key{background:var(--wrong);color:var(--on-wrong)}.term{border-bottom:2px dotted var(--brand);cursor:help;background:none;border-inline:0;border-top:0;padding:0;font:inherit}.termbox{margin:12px 0 0;padding:12px;border-radius:var(--radius);background:var(--brand-soft);border:1px solid var(--line)}.termbox b{display:block}.termbox .close{float:inline-start}.swipe-stage{position:relative;margin:14px 0 4px}.swipe-wrap{position:relative;perspective:900px;transition:transform .18s ease-out;touch-action:pan-y}.swipe-wrap.ghost{position:absolute;top:0;right:0;bottom:0;left:0;z-index:2;pointer-events:none;animation:fly-out .32s ease-in forwards}.swipe-wrap.ghost .stamp{opacity:1}.flipcard.static{transition:none;cursor:default}.fly-know{--to: -130%}.fly-dont{--to: 130%}@keyframes fly-out{0%{transform:translate(var(--from, 0px));opacity:1}to{transform:translate(var(--to)) rotate(10deg);opacity:0}}.flipcard{position:relative;display:block;width:100%;min-height:240px;padding:0;border:0;background:transparent;cursor:pointer;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.2,.7,.3,1);text-align:center}.flipcard.flipped{transform:rotateY(180deg)}.face{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:24px 20px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);backface-visibility:hidden;-webkit-backface-visibility:hidden}.face.back{transform:rotateY(180deg)}.flash-main{font-size:1.4rem;font-weight:800}.flash-answer{font-size:1.05rem;line-height:1.65}.flash-hint{font-size:.82rem;color:var(--ink-soft)}.stamp{position:absolute;top:16px;padding:6px 14px;border-radius:10px;font-weight:800;pointer-events:none;transform:rotate(-8deg)}.stamp.know{inset-inline-start:14px;background:var(--right);color:var(--on-right)}.stamp.dont{inset-inline-end:14px;background:var(--wrong);color:var(--on-wrong);transform:rotate(8deg)}.btn.know{background:var(--right);border-color:var(--right);color:var(--on-right)}.round-meta{margin-top:10px}.swipe-hint{text-align:center}.deck-count{font-size:1.7rem;font-weight:800;margin:2px 0}.boxes{display:flex;gap:10px;align-items:flex-end;margin-top:10px}.boxes .b{flex:1;display:flex;flex-direction:column;justify-content:flex-end;gap:4px;text-align:center}.boxes .b i{display:block;border-radius:6px 6px 2px 2px;background:var(--brand);opacity:.45}.boxes .b:last-child i{opacity:1}.boxes .b small{color:var(--ink-soft);font-size:.72rem}.btn.start-round{width:100%;margin-top:14px;font-size:1.05rem}.sumline{display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:1px solid var(--line)}.sumline:last-child{border-bottom:0}.sumline .ico{width:24px;text-align:center}.sumline .ico.up{color:var(--right);font-weight:700}.sumline .ico.down{color:var(--wrong);font-weight:700}@media (prefers-reduced-motion: reduce){.swipe-wrap,.flipcard{transition:none}.swipe-wrap.ghost{animation:none;visibility:hidden}}.signal-search{width:100%;min-height:var(--tap);padding:0 14px;margin:4px 0 12px;font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}.signal-search:focus{outline:2px solid var(--brand);outline-offset:1px}.signal-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}.signal{margin:0;display:flex;flex-direction:column;gap:10px}.signal img{width:100%;max-width:300px;margin:0 auto;border-radius:8px;image-rendering:-webkit-optimize-contrast}.signal figcaption p{margin:8px 0 0;font-size:.95rem}.meta{color:var(--ink-soft);font-size:.9rem}.pill{display:inline-block;padding:2px 10px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-size:.82rem;font-weight:600}.notice{padding:12px;border-radius:var(--radius);background:var(--warn-soft);color:var(--warn);border:1px solid currentColor}.notice.info{background:var(--brand-soft);color:var(--brand)}.banner{padding:18px;border-radius:var(--radius);text-align:center;font-size:1.2rem;font-weight:700}.banner.pass{background:var(--right-soft);color:var(--right)}.banner.fail{background:var(--wrong-soft);color:var(--wrong)}.bar{height:8px;border-radius:999px;background:var(--line);overflow:hidden}.bar>i{display:block;height:100%;background:var(--brand)}.timer{font-variant-numeric:tabular-nums;font-weight:700}.timer.low{color:var(--wrong)}.chips{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.chip{min-height:40px;padding:0 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);cursor:pointer}.chip.on{background:var(--brand);color:var(--on-brand);border-color:var(--brand)}.chip[disabled]{opacity:.45;cursor:default}.chip.danger,.btn.danger{background:var(--wrong-soft);color:var(--wrong);border-color:var(--wrong);font-weight:600}table.topics{width:100%;border-collapse:collapse}table.topics td{padding:8px 0;border-bottom:1px solid var(--line);vertical-align:middle}table.topics td.num{text-align:left;font-variant-numeric:tabular-nums;white-space:nowrap}.sheet{line-height:1.75;overflow-wrap:anywhere}.sheet table{width:100%;border-collapse:collapse;margin:12px 0;display:block;overflow-x:auto}.sheet th,.sheet td{border:1px solid var(--line);padding:6px 10px;text-align:right}.sheet h2{margin-top:28px;font-size:1.1rem;border-bottom:2px solid var(--brand-soft);padding-bottom:6px}.sheet code{background:var(--brand-soft);padding:1px 5px;border-radius:5px}.history{display:flex;align-items:flex-end;gap:4px;height:90px;margin-top:10px}.history>i{flex:1;min-width:6px;max-width:28px;border-radius:3px 3px 0 0;background:var(--brand);opacity:.65}.history>i.pass{background:var(--right);opacity:1}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:grid;place-items:center;padding:16px;overflow-y:auto;background:var(--scrim)}.modal{width:100%;max-width:560px;max-height:calc(100vh - 32px);overflow-y:auto;padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.modal h2{margin:0 0 14px;font-size:1.15rem}.modal p{margin:0 0 12px}.modal .row{margin-top:20px}.qtext{font-size:1.12rem;font-weight:600;margin:0 0 4px}.qimage{max-width:100%;border-radius:var(--radius);margin:12px 0}