*{box-sizing:border-box}
:root{--ink:#14213d;--muted:#5c6577;--bg:#f6f7fb;--card:#fff;--accent:#1d3557;--accent2:#2a9d8f;--warn:#f4d35e;--bad:#c0392b;--good:#2a9d8f;--line:#dfe3ec}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font:16px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
header#top{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:var(--accent);color:#fff;position:sticky;top:0;z-index:5}
header a.brand{color:#fff;text-decoration:none;font-weight:700;font-size:18px}
.logo{display:inline-block;width:26px;height:26px;border-radius:7px;background:#fff;color:var(--accent);text-align:center;line-height:26px;font-weight:800;margin-right:4px}
#who{font-size:13px;opacity:.9}
#who a{color:#fff}
main{max-width:640px;margin:0 auto;padding:12px 12px 80px}
h1{font-size:22px;margin:8px 0 10px}h2{font-size:18px;margin:16px 0 8px}h3{font-size:16px;margin:12px 0 6px}
.muted{color:var(--muted)}.small{font-size:13px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px;margin:10px 0;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
@media(max-width:380px){.grid{grid-template-columns:1fr}}
button,.btn{font:inherit;border:0;border-radius:10px;padding:10px 14px;background:var(--accent);color:#fff;cursor:pointer;text-decoration:none;display:inline-block;margin:4px 4px 4px 0;min-height:44px}
button.secondary,.btn.secondary{background:#e8ecf5;color:var(--ink)}
button.ghost{background:transparent;color:var(--accent);border:1px solid var(--line)}
button:disabled{opacity:.5}
button.opt{display:block;width:100%;text-align:left;background:#fff;color:var(--ink);border:2px solid var(--line);margin:6px 0}
button.opt.chosen{border-color:var(--accent);background:#eef3ff}
button.opt.right{border-color:var(--good);background:#e8f7f4}
button.opt.wrong{border-color:var(--bad);background:#fdeceb}
input,textarea,select{font:inherit;width:100%;padding:10px;border:1px solid var(--line);border-radius:10px;background:#fff;margin:4px 0 8px}
textarea{min-height:90px}
label{display:block;font-size:14px;margin-top:6px}
label.check{display:flex;gap:8px;align-items:flex-start}
label.check input{width:auto;margin-top:4px}
.bubble{padding:10px 12px;border-radius:14px;margin:8px 0;max-width:94%}
.tutor{background:#fff;border:1px solid var(--line);border-top-left-radius:4px}
.me{background:#dfe9ff;margin-left:auto;border-top-right-radius:4px}
.hint{background:#fff8e1;border:1px solid #f1d98a}
.tag{display:inline-block;font-size:12px;padding:2px 8px;border-radius:99px;background:#e8ecf5;color:var(--ink);margin:2px 4px 2px 0}
.two{border-left:4px solid var(--accent2);padding:6px 10px;margin:6px 0;background:#f3faf9;border-radius:6px}
.two .lab{font-size:12px;font-weight:700;color:var(--accent2);text-transform:uppercase;letter-spacing:.03em}
.two .math{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:15px;margin:2px 0 6px;word-break:break-word}
.skills{display:flex;flex-wrap:wrap;gap:4px;margin:6px 0}
.skill{font-size:12px;border-radius:8px;padding:3px 7px;background:#eef0f5}
.skill.s1{background:#fff1c7}.skill.s2{background:#d8f1ec}.skill.s3{background:#b9e6dc;font-weight:700}
.dots{display:flex;gap:4px;margin:4px 0}.dots i{width:10px;height:10px;border-radius:50%;background:#d5d9e3;display:inline-block}.dots i.on{background:var(--accent)}
.sentence{display:flex;flex-wrap:wrap;gap:2px;align-items:center;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:18px;margin:6px 0}
.sym{background:#f0f3fa;color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:3px 6px;margin:1px;min-height:34px;font-family:inherit;font-size:18px}
.sym.noun{background:#e3f2fd}.sym.verb{background:#ffe8cc}
.pop{position:fixed;left:12px;right:12px;bottom:16px;max-width:600px;margin:0 auto;background:#14213d;color:#fff;padding:12px 14px;border-radius:14px;z-index:20;box-shadow:0 6px 24px rgba(0,0,0,.25)}
.pop.hidden{display:none}.pop b{color:#ffd166}
canvas{display:block;max-width:100%;background:#fff;border:1px solid var(--line);border-radius:10px;touch-action:none}
.pick{border:2px solid var(--line);border-radius:12px;padding:4px;background:#fff;cursor:pointer}
.pick.chosen{border-color:var(--accent);box-shadow:0 0 0 2px #c9d7ff}
.pick .lbl{text-align:center;font-weight:700;font-size:14px}
.mirror{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:15px;min-height:22px;white-space:pre-wrap;word-break:break-all}
.mirror mark{background:var(--warn);border-radius:3px;padding:0 1px;cursor:pointer}
.tip{font-size:14px;background:#fff8e1;border:1px solid #f1d98a;border-radius:8px;padding:6px 8px;margin:4px 0}
.bar{height:8px;background:#e3e7ef;border-radius:9px;overflow:hidden}.bar>span{display:block;height:100%;background:var(--accent2)}
table{border-collapse:collapse;width:100%;font-size:14px}td,th{border-bottom:1px solid var(--line);padding:6px 4px;text-align:left;vertical-align:top}
.tabs{display:flex;flex-wrap:wrap;gap:4px;margin:6px 0 10px}.tabs button{min-height:36px;padding:6px 10px;font-size:14px}
.tabs button.on{background:var(--accent2)}
.ok{color:var(--good);font-weight:700}.no{color:var(--bad);font-weight:700}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.row>*{flex:1}
.report{background:linear-gradient(160deg,#1d3557,#2a9d8f);color:#fff;border-radius:18px;padding:16px}
.report .bar{background:rgba(255,255,255,.25)}.report .bar>span{background:#ffd166}
.center{text-align:center}
.lock{background:#eef0f5;border-radius:10px;padding:10px}
.err{color:var(--bad)}

.hero{background:linear-gradient(160deg,#1d3557,#2a9d8f);color:#fff;border-radius:18px;padding:18px;margin-top:6px}
.hero h1{font-size:26px;color:#fff}
.grid3{display:grid;grid-template-columns:1fr;gap:10px}
@media(min-width:560px){.grid3{grid-template-columns:1fr 1fr 1fr}}
button.lvl{font-size:18px;padding:16px;background:#fff;color:var(--accent);border:2px solid var(--accent)}
.progress{display:flex;gap:6px;margin:8px 0 4px}.progress span{flex:1;height:8px;border-radius:9px;background:#dfe3ec;transition:background .3s}
.progress span.done{background:var(--accent2)}.progress span.now{background:var(--accent)}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0;min-height:44px}
button.chip{background:#fff;color:var(--ink);border:2px solid var(--line);border-radius:10px;padding:8px 10px;min-height:44px;touch-action:none;margin:0}
button.chip.chosen{border-color:var(--accent);box-shadow:0 0 0 3px #c9d7ff}button.chip.on{background:#e3f2fd}
.bins{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.bin{border:2px dashed #9aa3b5;border-radius:12px;min-height:110px;padding:8px;display:flex;flex-direction:column;gap:6px;align-items:flex-start;cursor:pointer}
.bin b{font-size:13px;color:var(--muted)}
.built{display:flex;flex-wrap:wrap;gap:4px;min-height:48px;border-bottom:2px solid var(--accent);padding:4px 0;margin:6px 0}
.item{border-top:1px solid var(--line);padding:8px 0}.item:first-child{border-top:0}
button.line{display:block;width:100%;text-align:left;background:#fff;color:var(--ink);border:2px solid var(--line);margin:4px 0}
button.line.chosen{border-color:var(--bad);background:#fff3cd}
.big{font-size:22px;margin:6px 0 8px}
.report .score{font-size:64px;font-weight:800;line-height:1}.report .score span{font-size:20px;font-weight:400;opacity:.8;margin-left:4px}
.report .rank{color:#ffd166;font-weight:700;font-size:20px;margin:2px 0 10px}
.report .sub{margin:8px 0}.row2{display:flex;justify-content:space-between;font-size:14px;margin-bottom:3px}
.report .habit{background:rgba(255,255,255,.12);border-radius:10px;padding:8px;margin:10px 0}
.report ol{margin:4px 0 0 0;padding-left:20px}
.locked{position:relative;margin:12px 0;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#fff}
.locked .blur{filter:blur(5px);padding:12px;user-select:none;pointer-events:none}
.locked .unlock{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:rgba(255,255,255,.55);padding:12px}
.preview{min-height:22px;font-size:18px;color:var(--accent);margin:-4px 0 4px 2px;overflow-x:auto}
.kb{position:fixed;left:0;right:0;bottom:0;background:#e9ecf3;border-top:1px solid #c9cfdc;padding:6px 4px calc(6px + env(safe-area-inset-bottom));z-index:30}
.kb.hidden{display:none}.kbrow{display:flex;gap:4px;margin:4px 0}
.key{flex:1;min-height:46px;margin:0;padding:0;background:#fff;color:var(--ink);font-size:20px;border-radius:8px;box-shadow:0 1px 0 #b9bfcc}
.key.wide{font-size:14px}
body.kb-open main{padding-bottom:330px}
.hiddenfile{display:none}
.streak{font-size:18px}
.big-text{font-size:19px}
.split{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:16px}
.split .right{position:sticky;top:60px;align-self:start;max-height:calc(100vh - 70px);overflow:auto}
@media(min-width:900px){main{max-width:1180px}}
.mono{font-family:ui-monospace,Menlo,Consolas,monospace}