:root{--purple:#7656d8;--purple-dark:#5d3ebc;--purple-light:#f0ebfc;--ink:#252537;--muted:#858594;--line:#eaeaf0;--bg:#f7f8fb;--green:#308976;--green-light:#eaf7f1;--orange:#c58b42;--radius:18px;font-family:Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;font-size:14px;line-height:1.65}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}button{border:0;background:none;color:inherit}button:disabled{cursor:not-allowed;opacity:.45}button:not(:disabled),a,input,select{transition:background .18s,color .18s,box-shadow .18s,transform .18s}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #a88ae7;outline-offset:4px}svg{width:22px;height:22px;display:block;flex-shrink:0}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.45}button svg{pointer-events:none}.sidebar{width:236px;position:fixed;inset:0 auto 0 0;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:35px 22px 20px;z-index:20}.brand{display:flex;align-items:center;gap:11px;font-weight:750;font-size:18px;letter-spacing:-.4px;padding-left:4px}.brand-mark{width:41px;height:44px;border-radius:13px;background:var(--purple);color:white;display:grid;place-items:center;font-size:33px;line-height:1;box-shadow:0 6px 12px #7656d822}.brand small{display:block;font-size:8px;font-weight:650;letter-spacing:2.1px;color:#9390a5;margin-top:2px}.workspace-label{font-size:10px;color:#a2a0af;letter-spacing:1.5px;display:flex;justify-content:space-between;align-items:center;margin:48px 13px 16px}.workspace-label span{font-size:8px;letter-spacing:.7px;border:1px solid var(--line);border-radius:4px;padding:1px 5px}nav{display:grid;gap:7px}.nav-item{display:flex;align-items:center;gap:13px;padding:13px 16px;border-radius:10px;color:#82818f;font-size:13px;font-weight:550}.nav-item svg{width:19px;height:19px}.nav-item:hover{background:#f7f5fc;color:var(--purple)}.nav-item.active{color:var(--purple);background:var(--purple-light);font-weight:650}.nav-dot{margin-left:auto;width:5px;height:5px;border-radius:50%;background:var(--purple)}.nav-item:not(.active) .nav-dot{display:none}.nav-badge{font-size:10px;background:#f1f1f5;border-radius:5px;min-width:22px;text-align:center;margin-left:auto;color:#9794a5}.sidebar-bottom{margin-top:auto;padding-top:40px}.side-tip{background:linear-gradient(135deg,#f7f5ff,#faf9ff);border:1px solid #f0ebfb;border-radius:13px;padding:22px 17px 14px;position:relative;overflow:hidden}.tip-star{position:absolute;right:10px;top:9px;color:#c7b6ef;font-size:42px;line-height:1}.side-tip strong{font-size:13px;font-weight:650;line-height:1.8;position:relative}.side-tip p{font-size:11px;color:#9993aa;line-height:1.9;margin-top:10px}.text-button{color:var(--purple);font-size:11px;font-weight:600;padding:12px 0 0;display:flex;width:100%;justify-content:space-between}.local-status{display:flex;align-items:center;font-size:10px;color:#9e9ba9;gap:7px;margin:23px 7px 0}.local-status>span:first-child{width:5px;height:5px;background:#82b5a3;border-radius:50%}.version{margin-left:auto}.app-shell{margin-left:236px}.topbar{height:82px;background:#ffffffc9;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 42px;backdrop-filter:blur(12px)}.breadcrumb{font-size:12px;color:#93909f;display:flex;align-items:center;gap:15px}.breadcrumb span{color:#d0cdd7}.breadcrumb strong{font-weight:500;color:#504c60}.header-actions{display:flex;align-items:center;gap:21px}.icon-button{width:30px;height:30px;display:grid;place-items:center;color:#9994a6;border-radius:50%}.icon-button:hover{background:var(--purple-light);color:var(--purple)}.icon-button svg{width:19px;height:19px}.header-divider{height:20px;width:1px;background:var(--line)}.profile-button{display:flex;align-items:center;gap:10px;font-size:12px}.profile-button>span:last-child svg{width:13px;color:#a7a2b2}.avatar{display:grid;place-items:center;height:32px;width:32px;border-radius:50%;background:#ece7f8;color:#8c75be;font-size:12px}.avatar.large{width:54px;height:54px;font-size:20px;margin-bottom:20px}main{max-width:1510px;margin:0 auto;padding:35px 42px 24px;min-height:calc(100vh - 145px);outline:none!important}footer{display:flex;justify-content:space-between;gap:16px;color:#a8a7b3;font-size:10px;padding:18px 42px 22px}.footer-dot{margin:0 7px;color:#ccc9d4}.page-heading{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:24px;gap:20px}.eyebrow{font-size:10px;letter-spacing:2px;color:#a39aad;font-weight:600;margin-bottom:5px}.page-heading h1{font-size:26px;letter-spacing:-.6px;font-weight:700}.page-heading p{font-size:12px;color:var(--muted);margin-top:8px}.subtle-pill{display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:20px;padding:6px 12px;color:#94909f;font-size:10px;background:white;white-space:nowrap}.subtle-pill svg{width:13px;height:13px;color:var(--green)}.home-grid{display:grid;grid-template-columns:minmax(0,1fr) 282px;gap:24px;align-items:start}.main-column,.right-column{display:grid;gap:25px}.hero{min-height:241px;border-radius:var(--radius);background:#eee9fa;position:relative;overflow:hidden;display:flex;align-items:center;padding:30px 32px;border:1px solid #e7e0f7}.hero-copy{position:relative;z-index:2;width:65%}.hero-label{display:inline-flex;align-items:center;gap:6px;color:#8b70c2;font-size:9px;letter-spacing:1.7px;font-weight:650;margin-bottom:12px}.hero-label span{font-size:13px}.hero h2{font-size:29px;line-height:1.55;letter-spacing:-.8px;font-weight:720}.hero h2 em{font-style:normal;color:var(--purple)}.hero p{color:#9690a6;font-size:11px;margin-top:12px;line-height:1.9;max-width:280px}.hero-art{position:absolute;right:-10px;bottom:-1px;width:42%;height:100%;min-width:220px;opacity:.97}.hero-art svg{width:100%;height:100%}.hero-doodle{position:absolute;right:20px;top:18px;font-size:8px;letter-spacing:1.5px;color:#b5a9ce;transform:rotate(9deg)}.section-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:15px}.section-head h2{font-size:16px;font-weight:650;display:flex;align-items:center;gap:9px}.section-head h2 svg{width:18px;color:var(--purple)}.section-head>span{font-size:10px;color:#a6a2b0}.difficulty-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.difficulty-card{text-align:left;background:white;border:1.5px solid var(--line);border-radius:13px;padding:19px 17px 16px;position:relative;min-height:195px;transition:.2s}.difficulty-card:hover{transform:translateY(-3px);border-color:#c8b9e9;box-shadow:0 7px 18px #66528d08}.difficulty-card.selected{border-color:var(--purple);background:#fdfbff;box-shadow:0 3px 10px #7656d809}.difficulty-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px}.difficulty-icon{width:38px;height:38px;display:grid;place-items:center;border-radius:11px;background:#ecf6ef;color:#719e7d}.difficulty-icon svg{width:22px;height:22px}.normal .difficulty-icon{background:#f0ebfd;color:#a28ac9}.hard .difficulty-icon{background:#fcf0e5;color:#d6a068}.radio-mark{width:15px;height:15px;border-radius:50%;border:1.5px solid #dfdce8;display:grid;place-items:center}.selected .radio-mark{background:var(--purple);border-color:var(--purple)}.selected .radio-mark:after{content:'✓';font-size:9px;color:white}.difficulty-card h3{font-family:Inter,-apple-system,sans-serif;font-size:19px;letter-spacing:-.4px;font-weight:700}.difficulty-card h3 span{font-family:inherit;font-size:10px;color:#aaa3b6;margin-left:6px;font-weight:450}.difficulty-card p{font-size:10px;color:#9a95a5;margin-top:5px;line-height:1.8}.difficulty-bottom{border-top:1px solid #efedf4;margin-top:14px;padding-top:10px;display:flex;align-items:center;justify-content:space-between;font-size:9px;color:#a5a0ae}.difficulty-bars{display:flex;gap:2px;align-items:flex-end;height:12px}.difficulty-bars i{display:block;width:3px;border-radius:1px;background:#e2dce9}.difficulty-bars i:nth-child(1){height:5px}.difficulty-bars i:nth-child(2){height:8px}.difficulty-bars i:nth-child(3){height:11px}.easy .difficulty-bars i:nth-child(1),.normal .difficulty-bars i:not(:last-child),.hard .difficulty-bars i{background:#ad9cce}.challenge-settings{background:#fff;border:1px solid var(--line);border-radius:13px;padding:20px 22px;margin-top:16px}.settings-label{font-size:11px;color:#706a7d;margin-bottom:11px;display:flex;align-items:center;gap:7px}.settings-label small{color:#b1abbc;font-size:9px}.topic-chips{display:flex;flex-wrap:wrap;gap:7px}.chip{font-size:11px;padding:7px 12px;border:1px solid #ece9f3;border-radius:7px;background:#fff;color:#9891a5;display:inline-flex;align-items:center;gap:6px}.chip svg{width:13px;height:13px}.chip:hover{border-color:#c6b5e7;color:var(--purple)}.chip.active{color:var(--purple);border-color:#dacbf6;background:#f5f1fc;font-weight:550}.start-line{border-top:1px solid #f0edf5;margin-top:19px;padding-top:17px;display:flex;align-items:center;justify-content:space-between;gap:12px}.start-meta{font-size:10px;color:#aaa3b4;display:flex;gap:11px}.start-meta span{display:flex;gap:5px;align-items:center}.start-meta svg{width:13px;height:13px}.primary-button{background:var(--purple);color:white;display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:11px 21px;border-radius:9px;font-size:12px;font-weight:550;box-shadow:0 4px 8px #7656d81a}.primary-button:hover{background:var(--purple-dark);transform:translateY(-1px)}.primary-button svg{width:16px;height:16px}.secondary-button{border:1px solid #e4deee;background:#fff;color:#80738f;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 17px;border-radius:9px;font-size:12px}.secondary-button:hover{background:#f7f4fc;border-color:#cbbce6}.secondary-button svg{width:16px;height:16px}.full-width{width:100%}.how-to{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:2px 0}.how-to-item{display:flex;align-items:center;gap:10px}.step-number{height:27px;width:27px;flex-shrink:0;background:#efedf5;color:#a098b1;font-size:9px;border-radius:8px;display:grid;place-items:center}.how-to-item strong{display:block;font-size:10px;font-weight:550;color:#777080}.how-to-item p{font-size:9px;color:#b2abb9;margin-top:2px}.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}.panel-title{display:flex;align-items:center;justify-content:space-between;font-size:12px;font-weight:650;margin-bottom:18px}.panel-title>span{display:flex;gap:8px;align-items:center}.panel-title svg{width:16px;color:#aba4bc}.panel-title button{font-size:10px;color:#aaa4b5;font-weight:400}.panel-title button:hover{color:var(--purple)}.score-panel .hello{font-size:10px;color:#a59caf;letter-spacing:.5px}.score-panel h3{font-size:15px;font-weight:600;margin-top:3px}.personal-level{margin:18px 0;display:flex;gap:13px;align-items:center;background:#fbf9ff;border-radius:11px;padding:14px 10px}.level-emblem{display:grid;place-items:center;border-radius:50%;height:47px;width:47px;background:#eee8fc;position:relative;color:#aa94ce}.level-emblem svg{width:25px;height:25px}.personal-level strong{font-size:11px;font-weight:600;display:block;color:#78668f}.personal-level small{color:#b1a5bf;font-size:9px}.personal-stats{display:grid;grid-template-columns:repeat(3,1fr);margin-top:20px;text-align:center;gap:5px}.personal-stats>div+div{border-left:1px solid var(--line)}.personal-stats strong{display:block;font-size:21px;line-height:1.3;font-weight:650;color:#55485f;letter-spacing:-.6px}.personal-stats small{font-size:9px;color:#aaa1b4;display:block;margin-top:5px}.achievement-line{margin-top:19px;display:flex;align-items:center;justify-content:space-between;color:#b1a6bd;font-size:9px}.thin-track{height:4px;background:#f0ecf7;border-radius:5px;margin-top:7px;overflow:hidden}.thin-track span{height:100%;display:block;background:#b69ddd;border-radius:5px}.board-panel{padding:20px 22px}.local-tag{font-size:8px!important;border:1px solid #eeeaf4;padding:1px 6px;border-radius:4px;color:#b8b0c3;font-weight:400;letter-spacing:.5px}.mini-empty{text-align:center;padding:5px 0 16px}.empty-trophy{height:48px;width:48px;margin:4px auto 10px;display:grid;place-items:center;border-radius:50%;background:#fcf7ef;color:#d7bc8d}.empty-trophy svg{width:25px;height:25px}.mini-empty strong{font-size:11px;color:#8a7a60;font-weight:550}.mini-empty p{font-size:10px;color:#b4aaba;margin:5px 0 10px}.mini-empty button{font-size:10px;color:var(--purple)}.board-foot{font-size:9px;color:#b3aabb;text-align:center;border-top:1px solid var(--line);padding-top:12px}.mini-rank{display:flex;gap:9px;align-items:center;padding:10px 0;font-size:11px}.mini-rank .rank-number{width:15px;color:#b09cc8;font-weight:700}.mini-rank .mini-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;color:#7c6e89}.mini-rank .points{font-weight:650;color:#88729f}.knowledge-teaser{background:#edf5f2;border:1px solid #e6eeea;border-radius:15px;padding:20px;position:relative;overflow:hidden}.teaser-label{font-size:8px;letter-spacing:1.6px;color:#91afa1;display:flex;align-items:center;gap:6px}.teaser-label svg{width:13px}.knowledge-teaser h3{font-size:13px;color:#567367;margin-top:10px;line-height:1.8}.knowledge-teaser p{font-size:10px;color:#96aa9f;margin-top:7px}.knowledge-teaser button{color:#709182;font-size:10px;margin-top:12px;display:flex;gap:12px;align-items:center}.knowledge-teaser button svg{width:13px}.teaser-orbit{position:absolute;width:105px;height:105px;border:1px solid #dbe9e1;border-radius:50%;right:-55px;top:55px}.teaser-orbit:after{content:'';position:absolute;inset:12px;border:1px solid #dbe9e1;border-radius:50%}
/* Challenge */
.quiz-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:25px}.quiz-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.back-button{display:flex;align-items:center;gap:7px;color:#908899;font-size:11px}.back-button svg{width:15px;height:15px}.quiz-meta{display:flex;gap:12px;align-items:center;color:#aaa0b4;font-size:11px}.quiz-meta .level-pill{color:var(--purple);background:var(--purple-light);border-radius:5px;padding:3px 10px;font-weight:600}.question-panel{padding:30px;background:white;border:1px solid var(--line);border-radius:var(--radius)}.progress-label{display:flex;align-items:center;justify-content:space-between;color:#aaa1b5;font-size:10px}.progress-label strong{color:var(--purple);font-weight:550}.quiz-progress{margin:10px 0 28px;height:5px;background:#f0edf6;border-radius:5px;overflow:hidden}.quiz-progress span{display:block;background:var(--purple);height:100%;border-radius:5px;transition:width .4s}.question-topic{display:inline-flex;gap:6px;align-items:center;font-size:10px;color:#9a80bc;background:#f6f2fb;padding:4px 10px;border-radius:5px;margin-bottom:12px}.question-topic svg{width:13px;height:13px}.question-panel h2{font-size:22px;line-height:1.75;font-weight:600;letter-spacing:-.2px}.question-context{border-left:3px solid #d6c7ed;background:#faf8ff;padding:12px 15px;margin-top:17px;color:#9d8caf;font-size:11px;line-height:1.9}.question-instruction{color:#aaa0b4;font-size:10px;margin:20px 0 12px}.options{display:grid;gap:11px}.option{width:100%;display:flex;text-align:left;align-items:center;gap:13px;border:1.5px solid #eae6ef;border-radius:10px;padding:16px;color:#777080;font-size:12px;line-height:1.8}.option:hover:not(:disabled){border-color:#bda7e4;background:#fcfaff}.option-letter{height:28px;width:28px;flex-shrink:0;display:grid;place-items:center;border:1px solid #e8e2ee;border-radius:7px;font-size:11px;color:#a296af;background:#fcfbfe}.option.selected{border-color:var(--purple);background:#f8f4ff;color:#6f4fa3}.option.selected .option-letter{background:var(--purple);color:white;border-color:var(--purple)}.option.correct{border-color:#92c6b0;background:#f1f9f5;color:#44735d}.option.correct .option-letter{background:#60a788;border-color:#60a788;color:white}.option.wrong{border-color:#ddaaaa;background:#fff5f5;color:#a86868}.option.wrong .option-letter{background:#ca8585;color:white;border-color:#ca8585}.option:disabled{opacity:1;cursor:default}.option-state{margin-left:auto;flex-shrink:0;font-size:10px;white-space:nowrap}.quiz-actions{border-top:1px solid var(--line);margin-top:26px;padding-top:21px;display:flex;align-items:center;justify-content:space-between}.keyboard-tip{font-size:10px;color:#b1a7bb}.keyboard-tip kbd{font-family:inherit;border:1px solid #ece7f2;border-radius:3px;padding:2px 5px;font-size:9px;margin:0 2px}.feedback{border:1px solid #e1eee7;background:#f7fbf8;border-radius:11px;padding:20px;margin-top:22px;animation:appear .25s}.feedback.is-wrong{border-color:#f0e3d4;background:#fdfaf5}.feedback-title{font-size:13px;color:#4b8669;display:flex;align-items:center;gap:8px;font-weight:600}.is-wrong .feedback-title{color:#b38b58}.feedback-title svg{width:17px;height:17px}.feedback-title .gain{margin-left:auto;font-size:12px}.feedback p{font-size:12px;color:#8b948f;line-height:1.95;margin-top:10px}.is-wrong p{color:#a29583}.takeaway{font-size:11px!important;color:#648a73!important;border-top:1px solid #e6efe9;padding-top:12px;margin-top:13px!important}.is-wrong .takeaway{border-color:#f0e7db;color:#aa8b65!important}.quiz-side{display:grid;gap:18px;align-content:start}.live-score{text-align:center;padding:24px}.live-score>small{color:#b0a6bc;font-size:10px;letter-spacing:1px}.live-score>strong{font-size:48px;display:block;line-height:1.3;color:var(--purple);margin:11px 0 5px;font-weight:650;letter-spacing:-2px}.live-score>span{font-size:10px;color:#afa4bc}.live-detail{display:flex;justify-content:space-around;border-top:1px solid var(--line);padding-top:16px;margin-top:22px}.live-detail strong{font-size:18px;display:block;color:#8c79a1;font-weight:550}.live-detail small{font-size:9px;color:#b6a9c4}.score-rules{font-size:11px;color:#a99cb6;line-height:2}.score-rules h3{color:#857194;font-size:12px;font-weight:550;margin-bottom:10px}.score-rules p+p{margin-top:8px}.encouragement{border:1px dashed #e0d6ed;border-radius:12px;padding:18px;color:#b3a4c1;font-size:11px;line-height:1.9}.encouragement strong{display:block;color:#9a86b0;font-weight:500;margin-bottom:5px}
/* Results, boards, knowledge */
.result-banner{background:linear-gradient(120deg,#f0e9fd,#f7f3ff);border:1px solid #e5d9f8;border-radius:var(--radius);padding:32px;text-align:center;position:relative;overflow:hidden}.result-icon{width:65px;height:65px;display:grid;place-items:center;background:#e8ddf8;color:#a18ac8;border-radius:50%;margin:0 auto 17px}.result-icon svg{width:33px;height:33px}.result-banner h1{font-size:26px;color:#6e5590}.result-banner>p{font-size:12px;color:#ac9abc;margin-top:8px}.result-score{font-size:66px;font-weight:700;color:var(--purple);line-height:1.3;margin-top:15px;letter-spacing:-3px}.result-score small{font-size:13px;font-weight:400;letter-spacing:0;margin-left:10px;color:#ab98bc}.result-stats{display:flex;justify-content:center;gap:50px;margin-top:15px}.result-stats strong{display:block;font-size:19px;font-weight:550;color:#88709f}.result-stats small{font-size:10px;color:#b39fc2}.result-actions{display:flex;justify-content:center;gap:10px;margin-top:25px;flex-wrap:wrap}.result-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;margin-top:24px}.answer-review{display:grid;gap:12px}.review-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px}.review-top{display:flex;gap:9px;align-items:flex-start}.review-top svg{width:16px;height:16px;margin-top:3px;color:#c4938f}.review-top.is-correct svg{color:#80ab96}.review-item h3{font-size:12px;font-weight:550;color:#776a83;flex:1;line-height:1.8}.review-item p{font-size:11px;color:#a398ad;line-height:1.9;margin-top:9px}.review-item .answer-label{color:#8b729e}.save-form{display:grid;gap:11px}.save-form label{font-size:11px;color:#9d90aa}.text-input{width:100%;border:1px solid #e8e0ef;border-radius:8px;padding:11px 12px;color:#776385;background:white;font-size:12px}.text-input::placeholder{color:#c2b7cc}.form-note{font-size:10px;color:#b0a2bc;line-height:1.9}.saved-message{background:#eff7f2;color:#80a08d;border-radius:9px;padding:16px;font-size:12px;line-height:1.8}.filters-bar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:22px;flex-wrap:wrap}.segmented{display:flex;padding:4px;background:#eeeaf5;border-radius:10px;gap:4px}.segmented button{font-size:11px;color:#a291b2;padding:7px 20px;border-radius:7px;min-width:70px}.segmented button.active{background:white;color:var(--purple);box-shadow:0 2px 5px #6c558c0b;font-weight:600}.select{background:white;border:1px solid #e7e1ef;padding:9px 30px 9px 12px;border-radius:8px;color:#92819f;font-size:11px}.board-wrap{background:white;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.board-caption{padding:20px 25px;border-bottom:1px solid var(--line);display:flex;gap:12px;justify-content:space-between;align-items:center}.board-caption strong{font-size:12px;color:#8c789e;font-weight:550}.board-caption span{font-size:10px;color:#b2a6bf}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;white-space:nowrap}th{font-size:10px;font-weight:500;color:#b1a3bc;background:#fcfbfe;padding:15px 25px}td{font-size:12px;color:#8f7a9e;padding:18px 25px;border-top:1px solid #f2eef7}.table-score{font-weight:650;color:var(--purple);font-size:15px}.rank-medal{width:26px;height:26px;display:grid;place-items:center;border-radius:8px;background:#f8f3ea;color:#bca16a;font-size:11px;font-weight:700}.empty-state{text-align:center;padding:64px 22px}.empty-symbol{width:68px;height:68px;border-radius:20px;background:#f0eaf9;color:#b39dcf;display:grid;place-items:center;margin:0 auto 18px}.empty-symbol svg{width:32px;height:32px}.empty-state h2{font-size:17px;font-weight:550;color:#917a9f}.empty-state p{font-size:12px;color:#b3a2bc;margin:10px auto 22px;max-width:390px;line-height:1.9}.board-note{font-size:10px;color:#b1a3bd;margin-top:15px}.knowledge-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.knowledge-card{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:25px}.knowledge-card h2{font-size:16px;margin:15px 0 9px;color:#79638e}.knowledge-card>p{font-size:11px;color:#ab9cb8;line-height:1.9}.knowledge-icon{width:40px;height:40px;border-radius:12px;background:#f0e9fa;color:#a58bc3;display:grid;place-items:center}.knowledge-list{margin:19px 0;padding:0;list-style:none}.knowledge-list li{font-size:11px;color:#9783a5;line-height:1.9;padding:9px 0;border-top:1px solid #f0ebf5}.knowledge-card .secondary-button{margin-top:4px;width:100%}.prompt-box{background:#f6f2fc;border:1px solid #ebe2f7;border-radius:var(--radius);padding:25px;margin-top:24px}.prompt-box h2{font-size:15px;color:#88739d;display:flex;justify-content:space-between;align-items:center}.prompt-box h2 button{font-size:10px;color:var(--purple);font-weight:400}.prompt-box pre{font-family:inherit;white-space:pre-wrap;font-size:12px;line-height:2;color:#a18db3;margin:15px 0 0}.source-links{font-size:10px;color:#b4a6c0;margin-top:17px;line-height:2}.source-links a{color:#9e85b7;text-decoration:underline;text-underline-offset:3px}.mistake-actions{display:flex;gap:10px;align-items:center;margin-bottom:18px;flex-wrap:wrap}.mistake-actions .counter{margin-left:auto;color:#b0a1be;font-size:10px}.mistake-list{display:grid;gap:14px}.topic-tag{font-size:9px;color:#a58eb9;background:#f6f1fb;padding:2px 7px;border-radius:4px}.mistake-item-actions{display:flex;justify-content:space-between;align-items:center;margin-top:14px;border-top:1px solid #f0eaf6;padding-top:10px}.mistake-item-actions button{font-size:10px;color:#aa96bc}.mistake-item-actions button:hover{color:var(--purple)}.mistake-item-actions button.remove{color:#bd9a9a}.mistake-item-actions details{font-size:11px;color:#a695b4;line-height:1.9;flex:1}.mistake-item-actions summary{cursor:pointer;color:#9476ad;font-size:10px}.mistake-item-actions details p{margin:10px 20px 0 0}
/* Modal and responsive */
dialog{border:1px solid #e6ddef;border-radius:20px;padding:0;max-width:480px;width:calc(100% - 36px);color:var(--ink);box-shadow:0 30px 100px #3a27562b}dialog::backdrop{background:#29203566;backdrop-filter:blur(4px)}.modal-inner{padding:30px}.modal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.modal-head h2{font-size:20px;color:#7d6393}.modal-close{font-size:22px;color:#b4a4c0;line-height:1}.modal-inner p{font-size:12px;color:#a08bad;line-height:2;margin:12px 0}.modal-inner ul{font-size:12px;color:#a08bad;line-height:2.1;padding-left:19px}.modal-inner .primary-button{margin-top:18px}.login-placeholder{background:#f7f3fb;border:1px dashed #dcd0e9;border-radius:12px;text-align:center;padding:26px 20px;margin:20px 0}.login-placeholder svg{width:40px;height:40px;color:#b8a4cd;margin:0 auto 10px}.login-placeholder strong{font-size:13px;color:#9b82af;display:block}.login-placeholder small{display:block;font-size:10px;color:#b9a6c8;margin-top:5px}.toast{position:fixed;bottom:30px;left:calc(50% + 118px);transform:translate(-50%,20px);background:#504360;color:white;padding:11px 22px;border-radius:10px;box-shadow:0 5px 25px #40324d22;font-size:12px;z-index:100;opacity:0;pointer-events:none;transition:.2s;max-width:calc(100% - 32px)}.toast.show{opacity:1;transform:translate(-50%,0)}.storage-warning{font-size:11px;color:#ad8762;background:#fff6e9;border:1px solid #f1dfc7;border-radius:9px;padding:11px 14px;margin-bottom:20px}.callout{padding:14px 18px;background:#f3eefb;border:1px solid #e8def5;border-radius:10px;color:#a28bb6;font-size:11px;margin-bottom:20px}.confetti{position:absolute;inset:0;pointer-events:none;overflow:hidden}.confetti i{position:absolute;top:-10px;width:7px;height:12px;background:#c4a6ee;animation:fall 2s ease-in forwards}.confetti i:nth-child(2n){background:#c7dbc8}.confetti i:nth-child(3n){background:#e5cca5}@keyframes fall{to{transform:translateY(460px) rotate(540deg);opacity:0}}@keyframes appear{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:appear .3s ease-out}
@media(min-width:1500px){main{padding-top:40px}.hero{min-height:270px}.hero h2{font-size:34px}.hero-copy{width:65%}.hero-art{right:4px;width:44%}.difficulty-card{min-height:208px}.home-grid{grid-template-columns:minmax(0,1fr) 310px;gap:28px}.panel{padding:25px}.personal-level{padding:18px 13px}.knowledge-teaser{padding:24px}}
@media(max-width:1200px){.sidebar{width:204px;padding-left:16px;padding-right:16px}.brand{font-size:15px;gap:8px}.brand small{font-size:7px;letter-spacing:1.8px}.brand-mark{width:36px;height:39px}.app-shell{margin-left:204px}main{padding:28px}.topbar{padding:0 28px}.home-grid{grid-template-columns:minmax(0,1fr) 240px;gap:18px}.hero{padding:25px;min-height:225px}.hero h2{font-size:25px}.hero-art{min-width:190px;right:-26px;width:43%;opacity:.85}.hero-copy{width:76%}.hero p{max-width:230px}.difficulty-card{padding:16px 12px}.difficulty-card h3{font-size:18px}.difficulty-card h3 span{display:block;margin:2px 0 0}.difficulty-card p{font-size:9px}.panel{padding:18px}.start-meta{gap:7px;flex-wrap:wrap}.start-meta span{font-size:9px}.start-line .primary-button{white-space:nowrap;gap:9px;padding:11px 16px}.how-to-item{gap:7px}.how-to-item p{font-size:8px}.quiz-layout{grid-template-columns:minmax(0,1fr) 220px}.question-panel{padding:25px}.result-layout{grid-template-columns:minmax(0,1fr) 260px}.toast{left:calc(50% + 102px)}footer{padding-left:28px;padding-right:28px}.knowledge-card{padding:20px}.knowledge-grid{gap:15px}}
@media(max-width:1000px){.home-grid{grid-template-columns:minmax(0,1fr)}.right-column{grid-template-columns:1fr 1fr;gap:18px}.knowledge-teaser{display:none}.hero-copy{width:65%}.hero-art{width:35%;right:35px}.hero{min-height:220px}.hero h2{font-size:29px}.hero p{max-width:350px}.difficulty-card h3 span{display:inline;margin-left:7px}.difficulty-card p{font-size:11px}.difficulty-card{min-height:185px;padding:18px}.quiz-layout{grid-template-columns:1fr}.quiz-side{grid-template-columns:1fr 1fr}.quiz-side .encouragement{display:none}.live-score>strong{font-size:30px}.live-score{padding:18px}.live-detail{margin-top:10px;padding-top:10px}.live-detail strong{font-size:14px}.score-rules{padding:18px}.result-layout{grid-template-columns:1fr}.result-layout>aside{grid-row:1}.knowledge-grid{grid-template-columns:1fr}.knowledge-card{display:block}.knowledge-list{display:grid;grid-template-columns:1fr 1fr;column-gap:20px}.knowledge-card .secondary-button{width:auto}.knowledge-card h2{margin-top:10px}footer{flex-wrap:wrap}.page-heading h1{font-size:24px}}
@media(max-width:700px){.sidebar{position:relative;width:100%;height:auto;padding:17px 18px 0;border-right:none;border-bottom:1px solid var(--line)}.brand{font-size:17px}.brand-mark{height:34px;width:34px;font-size:29px;border-radius:10px}.brand small{font-size:7px;letter-spacing:1.8px}.workspace-label,.sidebar-bottom{display:none}nav{display:flex;gap:4px;margin-top:19px;justify-content:space-between}.nav-item{font-size:10px;padding:10px 9px;border-radius:8px 8px 0 0;gap:6px}.nav-item svg{width:15px;height:15px}.nav-dot,.nav-badge{display:none}.app-shell{margin-left:0}.topbar{height:58px;padding:0 20px}.breadcrumb{font-size:10px;gap:10px}.header-actions{gap:10px}.profile-button{font-size:10px;gap:6px}.avatar{height:25px;width:25px;font-size:10px}.header-divider{display:none}main{padding:25px 18px 15px;min-height:calc(100vh - 230px)}.page-heading{margin-bottom:20px}.page-heading h1{font-size:23px}.page-heading p{font-size:10px;max-width:250px}.eyebrow{font-size:8px;letter-spacing:1.6px}.subtle-pill{font-size:8px;padding:4px 7px;gap:4px}.subtle-pill svg{width:11px}.home-grid{gap:20px}.main-column{gap:22px}.hero{padding:25px 22px;min-height:220px}.hero h2{font-size:26px}.hero-copy{width:78%}.hero p{font-size:10px;max-width:225px}.hero-label{font-size:8px}.hero-art{right:-32px;min-width:180px;width:45%;opacity:.68}.hero-doodle{display:none}.hero-copy h2{position:relative;z-index:1}.section-head h2{font-size:14px}.section-head>span{font-size:9px}.difficulty-grid{gap:9px}.difficulty-card{padding:13px 10px;min-height:180px}.difficulty-icon{width:31px;height:31px;border-radius:9px}.difficulty-icon svg{width:19px}.difficulty-card h3{font-size:17px}.difficulty-card h3 span{display:block;font-size:9px;margin:4px 0 0}.difficulty-card p{font-size:9px;line-height:1.75;min-height:32px}.difficulty-top{margin-bottom:10px}.radio-mark{width:13px;height:13px}.difficulty-bottom{font-size:8px;margin-top:10px}.difficulty-bars{gap:1px}.difficulty-bars i{width:2px}.challenge-settings{padding:17px}.topic-chips{gap:6px}.chip{font-size:10px;padding:6px 9px}.chip svg{width:11px}.settings-label{font-size:10px}.start-line{align-items:flex-start}.start-meta{display:grid;gap:4px}.start-line .primary-button{padding:10px 14px;font-size:11px}.how-to{gap:8px}.how-to-item{gap:6px;align-items:flex-start}.how-to-item strong{font-size:9px}.how-to-item p{font-size:8px}.step-number{width:22px;height:24px;font-size:8px}.right-column{gap:12px}.panel{border-radius:13px;padding:16px}.panel-title{font-size:11px;margin-bottom:12px}.panel-title button{font-size:9px}.personal-level{padding:11px 7px;gap:7px;margin:13px 0}.level-emblem{width:34px;height:34px;flex-shrink:0}.level-emblem svg{width:21px}.personal-level strong{font-size:9px}.personal-level small{font-size:8px}.score-panel h3{font-size:12px}.personal-stats strong{font-size:17px}.personal-stats small{font-size:8px}.personal-stats{margin-top:15px}.score-panel .hello{font-size:8px}.achievement-line{font-size:8px;margin-top:15px}.mini-empty strong{font-size:10px}.mini-empty p{font-size:9px}.board-foot{font-size:8px}.mini-empty{padding-bottom:10px}.mini-rank{gap:5px;font-size:10px}footer{padding:15px 18px;gap:4px;font-size:8px}.toast{left:50%;font-size:11px}.quiz-top{margin-bottom:17px}.question-panel{padding:20px 17px}.question-panel h2{font-size:18px}.option{font-size:11px;padding:13px 11px;gap:9px}.option-letter{width:24px;height:24px;font-size:10px}.option-state{font-size:8px}.quiz-actions{gap:10px}.keyboard-tip{font-size:8px}.quiz-actions .primary-button{padding:11px 15px;font-size:11px}.quiz-meta{gap:6px;font-size:9px}.quiz-meta .level-pill{padding:2px 6px}.question-context{font-size:10px;padding:10px 12px}.feedback{padding:16px}.feedback p{font-size:11px}.feedback-title{font-size:12px}.quiz-side{gap:12px}.score-rules{font-size:9px}.score-rules h3{font-size:10px}.live-score>small{font-size:9px}.live-score>strong{font-size:35px}.live-score>span{font-size:9px}.live-detail{padding-top:12px;margin-top:12px}.live-detail small{font-size:8px}.result-banner{padding:25px 18px}.result-banner h1{font-size:23px}.result-banner>p{font-size:10px}.result-score{font-size:55px}.result-stats{gap:30px}.result-actions .primary-button,.result-actions .secondary-button{font-size:11px;padding:10px 14px}.filters-bar{gap:13px}.segmented button{padding:6px 16px;min-width:63px}.board-caption{padding:16px;align-items:flex-start;flex-direction:column;gap:4px}.board-caption span{font-size:9px}th,td{padding:14px 16px}.empty-state{padding:45px 20px}.empty-state p{font-size:11px}.knowledge-list{grid-template-columns:1fr}.prompt-box{padding:20px}.prompt-box pre{font-size:11px}.knowledge-card h2{font-size:15px}.page-heading .secondary-button{font-size:10px;padding:8px 10px}.page-heading .secondary-button svg{width:13px}.mistake-actions .counter{width:100%;margin-left:0}.modal-inner{padding:25px}.modal-head h2{font-size:18px}.modal-inner p,.modal-inner ul{font-size:11px}}
/* Keep instructional copy readable against the soft surfaces. */
.hero p{color:#766a88;font-size:12px}.page-heading p{color:#82798f}.difficulty-card p{color:#80728f;font-size:11px}.difficulty-card h3 span{color:#8c7d9c}.difficulty-bottom{color:#8a7c97;font-size:10px}.chip{color:#82718f;font-size:12px}.start-meta{color:#8e7e9c}.settings-label{font-size:12px}.personal-stats small,.personal-level small{color:#8d7c9d}.score-panel .hello{color:#9583a4}.achievement-line{color:#9581a5}.panel-title button{color:#9782a7}.mini-empty p,.board-foot{color:#9b88a7}.knowledge-teaser p{color:#698575}.knowledge-teaser h3{color:#476758}.question-context{color:#80668f;font-size:12px}.question-instruction{color:#8f7b9f}.option{color:#73617e;font-size:13px}.keyboard-tip{color:#9b87ad}.feedback p{color:#607d6b}.is-wrong p{color:#8f795c}.score-rules{color:#8d779f}.encouragement{color:#9a84ae}.result-banner>p{color:#9478a8}.result-stats small{color:#9b7eaf}.review-item p{color:#8e779e;font-size:12px}.review-item h3{font-size:13px}.form-note{color:#9780a9;font-size:11px}.save-form label{color:#8e729f}.board-caption span,.board-note{color:#9783a9}.empty-state p{color:#a086b0}.knowledge-card>p,.knowledge-list li{color:#8d759d;font-size:12px}.prompt-box pre{color:#8a6b9e}.source-links{color:#9b85ad;font-size:11px}.modal-inner p,.modal-inner ul{color:#8e729f}.login-placeholder small{color:#a18ab3}
@media(max-width:700px){.hero p{font-size:11px;max-width:210px}.difficulty-card p{font-size:10px}.difficulty-bottom{font-size:9px}.chip{font-size:10px}.settings-label{font-size:11px}.option{font-size:12px}.question-context{font-size:11px}.score-rules{font-size:10px}.review-item p{font-size:11px}.review-item h3{font-size:12px}.knowledge-card>p,.knowledge-list li{font-size:11px}.modal-inner p,.modal-inner ul{font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}