:root{font-family:system-ui,-apple-system,'Microsoft YaHei',sans-serif;color:#24314b;background:#f5f7fc}*{box-sizing:border-box}body{margin:0}header{background:#fff;border-bottom:1px solid #e5e9f3}header .nav{display:flex;align-items:center;justify-content:space-between;padding:18px 0}header b{color:#5c45aa}header small{font-size:12px;color:#8791a4}a{color:#5c45aa;text-decoration:none}nav a{margin-left:20px}.wrap{max-width:1100px;margin:auto;padding:0 20px}main{padding-top:28px!important;padding-bottom:50px!important}.heading{display:flex;justify-content:space-between;align-items:center;gap:15px}.muted{color:#7a8499}h1{font-size:27px}h2{font-size:20px;margin-top:22px}.panel{background:white;border:1px solid #e7eaf2;border-radius:16px;padding:24px;margin:15px 0;box-shadow:0 5px 22px #273a6310}.narrow{max-width:470px;margin:70px auto}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:15px}.cards .panel{margin:0}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}.stats article{padding:18px;border-radius:13px;background:#ede9fc}.stats span{display:block;color:#766a98;font-size:13px}.stats strong{display:block;font-size:25px;margin-top:7px}.compact article{padding:12px}.compact strong{font-size:20px}.tag,.chip{display:inline-block;background:#eeeafd;color:#6547a8;border-radius:30px;padding:6px 12px;font-size:12px;margin:3px}label{display:block;font-weight:600;margin:14px 0}input,select{display:block;width:100%;border:1px solid #ccd2e1;border-radius:9px;padding:12px;margin-top:8px;font:inherit}input[type=file]{font-size:13px}button,.btn{display:inline-block;background:#6c50ba;border:0;color:white;padding:12px 19px;border-radius:10px;font-weight:600;cursor:pointer;font:inherit}.secondary{background:#64748b}.outline{border:1px solid #6c50ba;padding:10px;border-radius:10px}.fields{display:grid;grid-template-columns:1fr 1fr;gap:12px}.alert{padding:12px;background:#fff1d6;border-radius:8px}.result{padding:14px;margin:10px 0;border-radius:10px}.good{background:#e6f6ed}.bad{background:#fff0ed}table{width:100%;border-collapse:collapse}td,th{border-bottom:1px solid #e8eaf2;padding:12px;text-align:left}footer{text-align:center;padding:20px;color:#9aa3b4;font-size:12px}@media(max-width:600px){.wrap{padding:0 13px}.stats{gap:6px}.stats article{padding:10px}.stats strong{font-size:20px}.heading{display:block}.fields{grid-template-columns:1fr}.panel{padding:17px}h1{font-size:23px}}@media print{header,footer,button{display:none}body{background:white}}

/* V2.1 responsive improvements */
:root{--accent:#6750b4;--ink:#1d2d4c;--surface:#fff}body{background:linear-gradient(180deg,#f7f5ff 0,#f3f6fc 420px)}.brand{font-weight:800;color:#5740a2}.nav{min-height:70px}.nav nav{white-space:nowrap}.eyebrow{color:#7257bc;font-weight:700;letter-spacing:.05em}.heading h1{margin:4px 0 8px}.panel{box-shadow:0 9px 30px #3443700b}.task-card{display:flex;flex-direction:column;align-items:flex-start;gap:12px}.task-card h3{flex:1;margin:6px 0;font-size:18px;line-height:1.5}.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin:18px 0 30px}.subject-tile{display:flex;flex-direction:column;gap:8px;min-height:130px;padding:20px;border-radius:16px;background:#fff;border:1px solid #e6e4f2;box-shadow:0 5px 18px #34437009}.subject-tile span{font-size:27px}.subject-tile b{color:var(--ink)}.subject-tile small{color:#78839b}.subject-tile.selected{border-color:#795dcb;background:#f0eaff}.canvas-shell{width:100%;border:1px solid #d6d8e7;border-radius:12px;overflow:hidden;background:#fff}.canvas-shell canvas{display:block;width:100%;height:auto;touch-action:none}.action-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}.media-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-top:16px}.media-grid a{display:block;color:#34405c}.media-grid img{width:100%;height:175px;object-fit:contain;background:#f7f7fa;border-radius:10px;border:1px solid #e7e7ef}.media-grid small{display:block;margin-top:6px;color:#6b7280}.parent-media{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.parent-media .panel{margin:0}.parent-media img{height:230px}@media(max-width:700px){.subject-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.subject-tile{min-height:104px;padding:12px}.subject-tile span{font-size:22px}.subject-tile small{font-size:10px}.stats{grid-template-columns:repeat(3,minmax(0,1fr))}.cards{grid-template-columns:1fr}.nav{gap:8px}.nav a{font-size:13px}nav a{margin-left:9px}}@media(max-width:390px){.subject-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}

.ai-feedback { white-space: pre-wrap; overflow-wrap: anywhere; }
.review-example + .review-example { margin-top: 1.5rem; }