:root{--bg:#fff9f0;--ink:#2b2d42;--muted:#6c7086;--card:#fff;--pri:#5b5bd6;--good:#2f9e44;--warn:#e8890c;--bad:#d6336c;--sci:#12b886;--math:#4c6ef5;--line:#ece4d6}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Segoe UI","Nunito","Trebuchet MS",Verdana,system-ui,sans-serif;font-size:20px;line-height:1.6}
a{color:var(--pri)}
main{max-width:980px;margin:0 auto;padding:16px 20px 80px}
.top{display:flex;justify-content:space-between;align-items:center;padding:12px 24px;background:#fff;border-bottom:3px solid var(--line)}
.brand{font-weight:800;font-size:24px;text-decoration:none;color:var(--ink)}
.top nav a{margin-left:16px;text-decoration:none;font-weight:700}
h1{font-size:36px;margin:.4em 0}h2{font-size:26px;margin:.3em 0 .5em}
.card{background:var(--card);border-radius:20px;padding:20px 26px;margin:18px 0;box-shadow:0 3px 0 var(--line),0 6px 18px rgba(0,0,0,.05);border:2px solid var(--line)}
.muted{color:var(--muted);font-weight:400;font-size:.9em}
.lead{font-size:22px}
.btn{font:inherit;font-size:19px;font-weight:700;padding:10px 20px;border-radius:14px;border:2px solid var(--line);background:#fff;cursor:pointer;color:var(--ink)}
.btn:hover{transform:translateY(-1px)}
.btn.primary{background:var(--pri);border-color:var(--pri);color:#fff}
.btn.good{background:var(--good);border-color:var(--good);color:#fff}
.btn.warn{background:#fff4e0;border-color:var(--warn);color:#8a4b00}
.btn.bad{background:#ffe3ec;border-color:var(--bad);color:#8f1239}
.btn:disabled{opacity:.5;cursor:default}
.hidden{display:none!important}
.login{max-width:420px;margin:60px auto;text-align:center}
.big-emoji{font-size:64px}
.pin{font-size:40px;letter-spacing:14px;text-align:center;width:220px;padding:10px;border-radius:14px;border:3px solid var(--line);margin:10px 0 16px;display:block;margin-left:auto;margin-right:auto}
.err{color:var(--bad);font-weight:700}
.coach{background:#fffbe6;border-color:#ffe08a}
.note{padding:4px 0;border-bottom:1px dashed #f1d77a}.note:last-child{border:0}
.plan{padding-left:28px}.plan li{margin:10px 0}
.plan-link{font-size:21px;text-decoration:none}
.note-inline{color:#8a4b00;font-size:.9em}
.week li.is-today{background:#eef0ff;border-radius:8px}
.bar{height:12px;background:#eee6d8;border-radius:8px;overflow:hidden;margin:6px 0;max-width:420px}
.bar div{height:100%;background:linear-gradient(90deg,#69db7c,#2f9e44);border-radius:8px}
.pill{background:#ffe3ec;color:#a61e4d;border-radius:20px;padding:2px 10px;font-size:.85em;font-weight:700}
.exam-list{columns:2;list-style:none;padding:0}
.subject-h{margin-top:28px}
.subj-dot{display:inline-block;width:16px;height:16px;border-radius:50%;background:#adb5bd;margin-right:8px}
.subj-dot.science{background:var(--sci)}.subj-dot.maths{background:var(--math)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.topic-card{display:block;background:#fff;border-radius:18px;padding:16px 18px;text-decoration:none;color:var(--ink);border:2px solid var(--line);border-top:8px solid #adb5bd;box-shadow:0 3px 0 var(--line)}
.topic-card.science{border-top-color:var(--sci)}.topic-card.maths{border-top-color:var(--math)}
.topic-card:hover{transform:translateY(-2px)}
.tc-title{font-weight:800;font-size:21px}.tc-meta{color:var(--muted);font-size:17px}
.crumbs{font-size:17px}
.tabs{display:flex;gap:10px;margin:14px 0;flex-wrap:wrap}
.tab{font:inherit;font-weight:800;font-size:20px;padding:12px 22px;border-radius:16px 16px 0 0;border:2px solid var(--line);border-bottom:none;background:#f3ede2;cursor:pointer;color:var(--ink)}
.tab.active{background:#fff;color:var(--pri)}
.lesson-nav{display:flex;flex-wrap:wrap;gap:6px}
.lesson-nav button{font:inherit;font-size:15px;border:2px solid var(--line);background:#fff;border-radius:20px;padding:3px 12px;cursor:pointer}
.lesson-nav button.on{background:var(--pri);color:#fff;border-color:var(--pri)}
.lesson-nav button.seen{border-color:#8ce99a}
.lesson-block table{border-collapse:collapse;margin:10px 0;font-size:18px}
.lesson-block td,.lesson-block th,.q-text td,.q-text th{border:2px solid var(--line);padding:6px 12px}
.lesson-block th{background:#f3f0ff}
.lesson-block.story{background:#f3f0ff;border-color:#d0bfff}
.lesson-block.story p{font-size:21px}
.lesson-img{margin:12px 0;text-align:center}.lesson-img img{max-width:100%;height:auto}
.lesson-img figcaption{color:var(--muted);font-size:16px}
.pager{display:flex;justify-content:space-between;align-items:center;margin:12px 0}
.flashcard{perspective:1200px;height:300px;cursor:pointer;margin:10px auto;max-width:640px;outline:none}
.fc-inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flashcard.flipped .fc-inner{transform:rotateY(180deg)}
.fc-front,.fc-back{position:absolute;inset:0;backface-visibility:hidden;border-radius:22px;padding:28px;display:flex;align-items:center;justify-content:center;text-align:center;font-size:24px;border:3px solid var(--line);overflow:auto}
.fc-front{background:#fff}
.fc-back{background:#ebfbee;transform:rotateY(180deg);border-color:#8ce99a}
.fc-count{text-align:center;color:var(--muted)}
.fc-actions{display:flex;justify-content:center;gap:16px;margin:10px 0}
.level-box{font-size:20px;font-weight:700;background:#fff;border-radius:16px;padding:10px 18px;border:2px solid var(--line)}
.q-tag{font-size:16px;color:var(--muted);font-weight:700}
.q-text{font-size:22px}
textarea.answer,input.answer{width:100%;font:inherit;font-size:21px;padding:12px;border-radius:14px;border:3px solid var(--line);min-height:52px}
textarea.answer{min-height:120px}
.q-actions{margin-top:12px}
.opts{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
.opt{border:3px solid var(--line);border-radius:14px;padding:12px;cursor:pointer;background:#fff;font:inherit;font-size:20px;text-align:center}
.opt.sel{border-color:var(--pri);background:#eef0ff}
.opt img{max-width:100%;height:150px}
.label-rows{display:grid;grid-template-columns:auto 1fr;gap:8px 14px;align-items:center;max-width:520px}
.label-rows select{font:inherit;font-size:19px;padding:6px;border-radius:10px;border:2px solid var(--line)}
.fb{border-radius:16px;padding:14px 18px;margin-top:14px}
.fb.right{background:#ebfbee;border:2px solid #8ce99a}.fb.wrong{background:#fff0f6;border:2px solid #fcc2d7}.fb.partly,.fb.neutral{background:#fff9db;border:2px solid #ffe066}
.selfmark{display:flex;gap:10px;flex-wrap:wrap;margin-top:8px}
.celebrate{font-size:22px;font-weight:800;margin:8px 0}
.table-wrap{overflow-x:auto}
table.prog{border-collapse:collapse;font-size:16px;width:100%;background:#fff}
table.prog td,table.prog th{border:1px solid var(--line);padding:6px 8px;vertical-align:top;text-align:left}
table.prog th{background:#f3f0ff}
td.weak{font-size:14px;max-width:320px}td.ans{max-width:360px;white-space:pre-wrap}
details.passage{background:#f8f9fa;border:2px solid var(--line);border-radius:14px;padding:10px 16px;margin:12px 0;font-size:19px;max-height:420px;overflow:auto}
details.passage summary{font-weight:800;cursor:pointer}
.diag-strip{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.diag-card{background:#fff;border:3px solid #d0bfff;border-radius:18px;padding:14px 16px}
.diag-card.first{border-color:#7950f2;box-shadow:0 0 0 4px #e5dbff}
.diag-card h3{margin:0 0 4px;font-size:22px}
.diag-card .btn{margin-top:8px;font-size:17px;padding:8px 14px;text-decoration:none;display:inline-block}
.where{background:linear-gradient(135deg,#f3f0ff,#fff9db);border-color:#b197fc}
.chip{display:inline-block;border-radius:12px;padding:2px 10px;margin:3px 3px 0 0;font-size:15px;font-weight:700}
.chip.ready{background:#d3f9d8;color:#1b5e20}.chip.nearly{background:#fff3bf;color:#7a4b00}.chip.learn{background:#ffe3e3;color:#a61e4d}
.res-row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 16px;border-radius:14px;margin:8px 0;font-size:20px}
.res-row.ready{background:#ebfbee;border:2px solid #8ce99a}.res-row.nearly{background:#fff9db;border:2px solid #ffe066}.res-row.learn{background:#fff0f6;border:2px solid #fcc2d7}
.progress-dots{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 12px}.progress-dots span{width:22px;height:10px;border-radius:6px;background:#e9ecef}.progress-dots span.done{background:#7950f2}.progress-dots span.cur{background:#b197fc}