:root{--bg:#eef1f4;--surface:#ffffff;--ink:#18232f;--muted:#5d6a78;--line:#d5dbe2;--accent:#1f6f78;--accent-soft:#dcecee;--again:#b4492f;--again-soft:#f6e3dd;--warn:#9a6a00;--warn-soft:#f6ecd2;--heat-0:#e3e8ed;--heat-1:#b9dadd;--heat-2:#79b7bd;--heat-3:#2f8a93;--heat-4:#1a5d64;--display:"Newsreader",Georgia,"Times New Roman",serif;--body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;--mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#11171d;--surface:#1a232c;--ink:#e7edf2;--muted:#93a1ae;--line:#2b3741;--accent:#5fb6bf;--accent-soft:#1d3539;--again:#e2856c;--again-soft:#3a2520;--warn:#e0b24f;--warn-soft:#3a3120;--heat-0:#222d36;--heat-1:#1f4045;--heat-2:#2a6a72;--heat-3:#3f98a1;--heat-4:#74c6ce;color-scheme:dark}}:root[data-theme=dark]{--bg:#11171d;--surface:#1a232c;--ink:#e7edf2;--muted:#93a1ae;--line:#2b3741;--accent:#5fb6bf;--accent-soft:#1d3539;--again:#e2856c;--again-soft:#3a2520;--warn:#e0b24f;--warn-soft:#3a3120;--heat-0:#222d36;--heat-1:#1f4045;--heat-2:#2a6a72;--heat-3:#3f98a1;--heat-4:#74c6ce;color-scheme:dark}*{box-sizing:border-box}body,html{margin:0}body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:15px;line-height:1.5;-webkit-text-size-adjust:100%}a{color:var(--accent)}h1,h2,h3{font-family:var(--display);font-weight:600;margin:0;text-wrap:balance;letter-spacing:-.01em}h1{font-size:1.9rem;line-height:1.15}h2{font-size:1.3rem}h3{font-size:1.05rem}p{margin:0}.muted{color:var(--muted)}.small{font-size:.85rem}.label{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:600}.num{font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.nav{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:var(--bg);border-bottom:1px solid var(--line);padding-top:env(safe-area-inset-top,0)}.nav-inner{max-width:720px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-block:10px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}.brand{font-family:var(--display);font-weight:600;font-size:1.15rem;color:var(--ink);text-decoration:none}.nav nav{display:flex;gap:2px;flex-wrap:wrap}.nav nav a{color:var(--muted);text-decoration:none;padding:6px 10px;border-radius:6px;font-weight:500;font-size:.9rem}.nav nav a[aria-current=page]{color:var(--ink);background:var(--surface);box-shadow:0 0 0 1px var(--line) inset}.wrap{max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:22px;padding-block:22px calc(40px + env(safe-area-inset-bottom, 0px));padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}section{gap:12px}.panel,section{display:flex;flex-direction:column;min-width:0}.panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;gap:14px}.row{gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap}.row,.stack{display:flex}.stack{flex-direction:column;gap:8px}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-gap:10px;gap:10px}.stat{display:flex;flex-direction:column;gap:2px}.stat b{font-family:var(--mono);font-size:1.5rem;font-weight:500;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}@media (max-width:520px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}}.btn{font:inherit;font-weight:600;border-radius:8px;padding:10px 16px;cursor:pointer;border:1px solid var(--line);background:var(--surface);color:var(--ink);text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px}.btn:disabled{opacity:.5;cursor:default}.btn.primary{background:var(--accent);color:var(--surface)}.btn.again,.btn.primary{border-color:transparent}.btn.again{background:var(--again-soft);color:var(--again)}.btn.ghost{border-color:transparent;background:none;color:var(--accent);padding:6px 4px}.btn.danger{color:var(--again)}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.pill{display:inline-block;font-size:.75rem;font-weight:600;padding:2px 9px;border-radius:999px;background:var(--accent-soft);color:var(--accent)}.pill.warn{background:var(--warn-soft);color:var(--warn)}.pill.bad{background:var(--again-soft);color:var(--again)}.pill.plain{background:var(--bg);color:var(--muted)}.bar{height:6px;border-radius:3px;background:var(--line);overflow:hidden}.bar>i{display:block;height:100%;background:var(--accent)}.groups{display:grid;grid-template-columns:repeat(auto-fill,minmax(58px,1fr));grid-gap:8px;gap:8px}.g{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:8px;padding:8px 4px 7px;cursor:pointer;font:inherit;display:flex;flex-direction:column;align-items:center;gap:5px;text-decoration:none}.g b{font-family:var(--mono);font-size:.9rem;font-weight:500}.g .bar{width:80%;height:4px}.g[aria-current=true]{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent) inset;background:var(--accent-soft)}.heat{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));grid-gap:6px;gap:6px}.cell{aspect-ratio:1;max-width:100%;border-radius:6px;background:var(--heat-0);display:flex;align-items:flex-end;justify-content:flex-end;padding:3px 5px;font-family:var(--mono);font-size:.68rem;color:var(--muted);position:relative}.cell[data-l="1"]{background:var(--heat-1)}.cell[data-l="2"]{background:var(--heat-2);color:var(--ink)}.cell[data-l="3"]{background:var(--heat-3);color:var(--surface)}.cell[data-l="4"]{background:var(--heat-4);color:var(--surface)}.cell.today{box-shadow:0 0 0 2px var(--ink)}.cell.future{background:transparent;box-shadow:0 0 0 1px var(--line) inset}.legend{display:flex;gap:4px;align-items:center;font-size:.75rem;color:var(--muted)}.legend i{width:12px;height:12px;border-radius:3px;display:inline-block}.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;min-height:300px;padding:34px 24px 26px;display:flex;flex-direction:column;justify-content:center;gap:14px;cursor:pointer;position:relative;box-shadow:0 1px 0 var(--line),0 12px 28px -20px rgba(0,0,0,.4);width:100%;font:inherit;color:inherit;text-align:center}.card .meta{position:absolute;top:12px;left:16px;right:16px;display:flex;justify-content:space-between;font-family:var(--mono);font-size:.72rem;color:var(--muted)}.word{font-family:var(--display);font-size:clamp(2.1rem,8vw,3rem);line-height:1.1;overflow-wrap:anywhere}.meaning,.word{font-weight:500}.meaning{font-size:1.12rem;text-wrap:balance}.example{font-family:var(--display);font-style:italic;font-size:1.08rem;color:var(--muted);border-top:1px solid var(--line);padding-top:14px;text-wrap:pretty}.answer{display:grid;grid-template-columns:1fr 1fr;grid-gap:10px;gap:10px}.answer .btn{padding:14px;font-size:1rem}.key{font-family:var(--mono);font-size:.7rem;opacity:.7}@media (prefers-reduced-motion:no-preference){.card{transition:transform .12s}.card:active{transform:scale(.99)}}.options{display:flex;flex-direction:column;gap:8px}.option{text-align:left;font:inherit;padding:12px 14px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer}.option.right{border-color:var(--accent);background:var(--accent-soft)}.option.wrong{border-color:var(--again);background:var(--again-soft)}.prompt{font-family:var(--display);font-size:1.25rem;line-height:1.4;text-wrap:pretty}.prompt.big{font-size:clamp(1.8rem,7vw,2.4rem)}.seg{display:flex;flex-wrap:wrap;gap:6px}.seg button{font:inherit;font-size:.88rem;padding:7px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer}.seg button[aria-pressed=true]{background:var(--ink);color:var(--surface);border-color:var(--ink)}input[type=date],input[type=email],input[type=number],input[type=search],select,textarea{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:9px 11px;min-width:0}textarea{width:100%;font-family:var(--mono);font-size:.75rem;min-height:110px;resize:vertical}.filters{display:grid;grid-template-columns:1fr auto auto;grid-gap:8px;gap:8px}@media (max-width:520px){.filters{grid-template-columns:1fr 1fr}.filters input{grid-column:1/-1}}.list{display:flex;flex-direction:column}.item{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-gap:4px 12px;gap:4px 12px;padding:12px 2px;border-bottom:1px solid var(--line)}.item .w{font-family:var(--display);font-weight:600;font-size:1.12rem}.item .m,.item .s{grid-column:1/-1}.item .s{font-family:var(--display);font-style:italic;color:var(--muted)}.notice{padding:10px 12px;border-radius:8px;background:var(--accent-soft);color:var(--ink);font-size:.9rem}.notice.bad{background:var(--again-soft)}.loading{color:var(--muted);padding:40px 0;text-align:center}.auth-bar{background:var(--bg);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;padding:5px max(16px,env(safe-area-inset-left,0px));min-height:32px}