:root{--bg:#f5f7fc;--ink:#202b46;--muted:#59667e;--accent:#3559cc;--line:#dce3ef;--soft:#edf1ff;--success:#216957;--danger:#a52e46}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:radial-gradient(ellipse at 95% 0,#e9e9fc,transparent 40%),var(--bg);color:var(--ink);font:17px/1.65 system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #395bd0;outline-offset:4px}a{color:var(--accent);text-underline-offset:4px}.skip{position:absolute;top:10px;left:12px;background:white;padding:10px;transform:translateY(-200%);z-index:5}.skip:focus{transform:none}header{max-width:1240px;margin:auto;display:flex;gap:16px;align-items:center;padding:24px 32px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;margin-right:auto;font-size:18px;font-weight:750;letter-spacing:-.03em;color:var(--ink);text-decoration:none}.brand-icon{background:var(--accent);color:white;display:grid;place-items:center;width:37px;height:39px;border-radius:11px;font-size:26px}.online{font-size:13px;color:var(--muted)}.online.offline{color:var(--danger)}main{max-width:1160px;margin:auto;padding:0 32px}.intro{display:grid;grid-template-columns:1.4fr 1fr;gap:48px;align-items:center;padding:42px 0 35px}h1{font-size:clamp(32px,4.1vw,49px);line-height:1.13;letter-spacing:-.055em;margin:0 0 19px;font-weight:700}h2{font-size:27px;line-height:1.3;letter-spacing:-.035em;margin:0 0 8px}h3{font-size:19px;margin:0 0 12px;line-height:1.4}p{margin:0 0 16px}.eyebrow,.small-label{font-size:11px;font-weight:750;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}.eyebrow{margin-bottom:13px}.small-label{display:block;margin-bottom:10px}.lede{color:var(--muted);font-size:16px;max-width:600px;margin:0}.intro-note{justify-self:end;border-left:2px solid #aebced;padding-left:24px;display:grid;gap:12px}.intro-note strong{font-size:20px;line-height:1.5}.intro-note>span:last-child{font-size:13px;color:var(--muted)}.tabs{display:flex;gap:8px;border-bottom:1px solid var(--line);padding-bottom:14px;flex-wrap:wrap}.tabs button{border:0;background:transparent;color:var(--muted);border-radius:9px;padding:10px 16px;font-size:15px;font-weight:650;min-height:44px}.tabs button[aria-current=page]{background:var(--ink);color:#fff}.tabs span{background:#ffffff28;padding:2px 6px;border-radius:5px;font-size:12px;margin-left:3px}.section-head{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:30px 0 20px}.section-head .eyebrow{margin-bottom:8px}.primary,.quiet,.right,.wrong,.text-button,.download{border:1px solid transparent;border-radius:8px;padding:11px 17px;font-size:15px;line-height:1.5;font-weight:650;min-height:44px}.primary{background:var(--accent);color:#fff}.primary:hover{background:#2948ad}.quiet{background:#fff;color:var(--ink);border-color:var(--line)}.text-button{background:transparent;color:var(--accent);padding-left:0;margin-right:18px}.filterbar{display:flex;align-items:end;flex-wrap:wrap;gap:14px;background:#edf0f8;border-radius:12px;padding:18px}.filterbar label{min-width:200px;flex:1}label{font-size:13px;font-weight:650;display:block}input,select,textarea{display:block;width:100%;background:#fff;border:1px solid #b2bfd3;border-radius:7px;padding:10px 12px;color:var(--ink);font-size:16px;margin-top:6px}textarea{resize:vertical;line-height:1.55}.hint{font-size:13px;font-weight:400;color:var(--muted);margin:12px 0}label .hint{display:block}.round-line{display:flex;justify-content:space-between;gap:16px;font-size:13px;color:var(--muted);margin:25px 0 9px}progress{display:block;appearance:none;border:none;height:5px;width:100%;border-radius:6px;background:var(--line);overflow:hidden;margin-bottom:24px}progress::-webkit-progress-bar{background:var(--line)}progress::-webkit-progress-value{background:var(--accent)}progress::-moz-progress-bar{background:var(--accent)}.flashcard{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 35px #23376908;overflow:hidden}.card-meta{display:flex;gap:14px;align-items:center;flex-wrap:wrap;padding:25px 30px 0;color:var(--muted);font-size:13px}.pill{display:inline-block;background:var(--soft);color:var(--accent);font-size:12px;font-weight:700;border-radius:6px;padding:5px 9px}.question-button{display:block;text-align:left;width:100%;background:transparent;color:var(--ink);border:0;padding:24px 30px 30px;font-size:clamp(22px,2.6vw,31px);font-weight:650;line-height:1.4;letter-spacing:-.035em}.question-button:hover{background:#fbfcff}.reveal-hint{font-size:14px;letter-spacing:0;font-weight:400;color:var(--muted);display:flex;justify-content:space-between;margin-top:26px}.reveal-hint>span{color:var(--accent);font-size:24px}#answer-area{padding:28px 30px;border-top:1px solid var(--line)}.answer-text{white-space:pre-wrap;font-size:18px;line-height:1.8;margin-bottom:25px}ul{padding-left:21px;margin:0 0 22px}li{padding:0 0 8px 3px;font-size:16px}li::marker{color:var(--accent)}.follow-up{background:#f0effc;border-radius:9px;padding:18px 20px;margin:20px 0}.follow-up p{margin:0;font-size:16px}summary{cursor:pointer;color:var(--accent);font-size:14px}#source-list{margin-top:16px}#source-list li{font-size:13px}.grade-actions{display:flex;gap:14px;margin:27px 0 12px}.grade-actions button{flex:1;display:flex;justify-content:space-between;font-size:17px}.right{background:var(--success);color:#fff}.wrong{background:#fff0f2;border-color:#e6c4cd;color:var(--danger)}.empty{background:#fff;border:1px dashed #bcc9df;border-radius:14px;text-align:center;padding:42px 25px;margin-top:24px}.empty>span{font-size:35px;color:var(--accent)}.empty p{max-width:500px;margin:0 auto;font-size:15px;color:var(--muted)}.notice{margin-top:18px;padding:13px 18px;border:1px solid #b4c6ea;border-radius:9px;background:#edf3ff;color:#254582;font-size:15px}.notice.error,.data-errors{background:#fff0f3;color:#8d243a;border-color:#edc2ce}.data-errors{padding:16px;border-radius:8px;font-size:14px;margin-top:16px;white-space:pre-line}.card-list{display:grid;gap:10px;margin-top:20px}.card-row{display:flex;align-items:center;justify-content:space-between;gap:22px;background:white;border:1px solid var(--line);border-radius:10px;padding:19px 22px}.card-row h3{font-size:17px;margin:7px 0}.card-row p{font-size:12px;color:var(--muted);margin:0}.card-row .empty-label{color:var(--danger)}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:24px 0}.stat{background:#fff;padding:20px;border:1px solid var(--line);border-radius:10px;min-width:0}.stat strong{display:block;font-size:28px;line-height:1.3;color:var(--accent);margin:8px 0}.stat span{font-size:13px;color:var(--muted)}.stat .date-stat{font-size:16px;line-height:1.6}.session-row{background:#fff;border-bottom:1px solid var(--line);padding:16px;font-size:14px;display:flex;justify-content:space-between;align-items:center;gap:15px}.spaced{margin-top:30px}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse;background:white;font-size:13px;min-width:620px}th,td{text-align:left;vertical-align:top;border-bottom:1px solid var(--line);padding:13px}th{color:var(--muted);font-weight:650}td:first-child{min-width:240px}dialog{width:min(850px,calc(100% - 30px));max-height:92vh;border:1px solid var(--line);border-radius:14px;padding:24px;color:var(--ink);box-shadow:0 24px 100px #17294b35}dialog::backdrop{background:#1b294a88}dialog .section-head{margin-top:0}.editor-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.full{grid-column:1/-1}#edit-sources{font-family:monospace;font-size:13px}#editor-error,#login-error{color:var(--danger);font-size:14px;white-space:pre-line}input:read-only{background:#f0f2f7;color:var(--muted)}.login-screen{max-width:680px;padding:60px 0}.login-box{max-width:420px;margin-top:30px;border:1px solid var(--line);background:#fff;padding:25px;border-radius:12px}.login-box button{width:100%;margin-top:17px}.login-box p:empty{margin:0}footer{font-size:12px;color:var(--muted);border-top:1px solid var(--line);margin-top:45px;padding:22px 0}.resume{background:#eaf3ef;border:1px solid #c3ddcf;padding:16px;border-radius:9px;margin-top:14px;display:flex;justify-content:space-between;align-items:center;gap:18px}.resume p{font-size:14px;margin:0}
@media(max-width:900px){.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.intro{gap:25px}.intro-note strong{font-size:17px}}
@media(max-width:650px){header{padding:18px;gap:10px;flex-wrap:wrap}.brand{font-size:17px}.online{font-size:11px}header .quiet{padding:7px 10px;font-size:12px}main{padding:0 18px}.intro{grid-template-columns:1fr;padding:30px 0;gap:22px}.intro-note{justify-self:start;font-size:13px}.intro-note strong{font-size:17px}.intro-note strong br{display:none}.tabs{gap:4px}.tabs button{padding:9px 10px;font-size:13px}.section-head{align-items:start}h2{font-size:23px}.filterbar{padding:14px}.filterbar label{min-width:150px}.filterbar>button{width:100%}.card-meta{padding:20px 20px 0}.question-button{padding:20px;font-size:24px}#answer-area{padding:22px 20px}.grade-actions{flex-direction:column}.stats-grid{gap:10px}.stat{padding:16px}.stat strong{font-size:25px}.card-row{padding:16px;gap:12px}.card-row .quiet{padding:9px;font-size:13px}.editor-grid{grid-template-columns:1fr}.full{grid-column:auto}.resume,.session-row{flex-wrap:wrap}.round-line{font-size:12px}.answer-text{font-size:17px}.login-screen{padding-top:35px}dialog{padding:20px}}

.card-meta .quiet{margin-left:auto}