html{min-width:320px}button,input,textarea,select{font-family:inherit}button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline-offset:2px;outline:3px solid #1f6feb47}:root{--bg:#f4f7ff;--surface:#fff;--surface-soft:#f8faff;--text:#182033;--muted:#667085;--line:#e6e9f2;--line-strong:#d4dbee;--brand:#2563eb;--brand-strong:#1d4ed8;--brand-soft:#eaf1ff;--good:#16a34a;--good-soft:#ecfdf5;--bad:#e11d48;--bad-soft:#fff1f4;--warn:#d97706;--warn-soft:#fffbeb;--shadow-sm:0 8px 24px #1c274c0f;--shadow-lg:0 24px 70px #1c274c1f}*{box-sizing:border-box}body{background:radial-gradient(circle at 12% 8%, #2563eb14, transparent 30%), radial-gradient(circle at 88% 0%, #16a34a0f, transparent 24%), var(--bg);color:var(--text);min-height:100vh;margin:0;font-family:Inter,Microsoft YaHei,system-ui,-apple-system,BlinkMacSystemFont,sans-serif}button{font:inherit;cursor:pointer}.login-screen{background:radial-gradient(circle at 12% 8%, #2563eb1a, transparent 30%), radial-gradient(circle at 88% 0%, #16a34a12, transparent 24%), var(--bg);justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.login-card{border:1px solid var(--line);width:min(420px,100%);box-shadow:var(--shadow-lg);text-align:center;background:#fff;border-radius:24px;padding:30px}.login-icon{background:var(--brand-soft);border-radius:20px;width:64px;height:64px;margin:0 auto 14px;font-size:30px;line-height:64px}.login-card h1{margin:0 0 8px;font-size:22px}.login-card p{color:var(--muted);margin:0 0 22px;font-size:13px}.login-card label{text-align:left;margin-bottom:14px;display:block}.login-card label span{color:#475069;margin-bottom:7px;font-size:12px;font-weight:600;display:block}.login-card input{border:1px solid var(--line);width:100%;height:44px;font:inherit;border-radius:12px;outline:none;padding:0 12px}.login-card input:focus{border-color:var(--brand);box-shadow:0 0 0 4px #2563eb1a}.login-error{background:var(--bad-soft);color:var(--bad);border-radius:10px;margin:10px 0;padding:9px 11px;font-size:12px}.logout-button{color:#475069;background:#fff;border:1px solid #e7ebf6;border-radius:999px;padding:7px 11px;font-size:12px;font-weight:700}.app-shell{min-height:100vh}.topbar{z-index:10;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#ffffffe0;border-bottom:1px solid #e4e8f4e6;justify-content:space-between;align-items:center;gap:24px;padding:20px 32px;display:flex;position:sticky;top:0}.topbar h1{letter-spacing:-.025em;color:#0f172a;margin:0 0 5px;font-size:24px}.topbar p{color:var(--muted);margin:0;font-size:13px}.topbar-metrics{flex-wrap:wrap;justify-content:flex-end;gap:10px;display:flex}.topbar-metrics span{color:#475069;background:#f1f4fb;border:1px solid #e7ebf6;border-radius:999px;padding:8px 12px;font-size:12px;font-weight:600}.layout{grid-template-columns:340px minmax(0,1fr);align-items:start;gap:24px;width:min(1200px,100% - 40px);margin:28px auto 48px;display:grid}.sidebar{flex-direction:column;gap:16px;display:flex;position:sticky;top:96px}.panel{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-sm);border-radius:20px;padding:20px}.panel h2{letter-spacing:-.01em;margin:0 0 14px;font-size:17px}.field{color:#475069;margin-bottom:16px;display:block}.field>span{margin-bottom:8px;font-size:12px;font-weight:600;display:block}.field select,.field input[type=number]{border:1px solid var(--line);width:100%;height:42px;color:var(--text);background:#fff;border-radius:12px;outline:none;padding:0 12px;transition:border-color .16s,box-shadow .16s}.field select:focus,.field input[type=number]:focus{border-color:var(--brand);box-shadow:0 0 0 4px #2563eb1a}.field.row{align-items:center;gap:8px;display:flex}.field.row span{margin:0}.type-grid,.ratio-grid{grid-template-columns:repeat(2,1fr);gap:8px;display:grid}.ratio-item{border:1px solid var(--line);background:#fff;border-radius:12px;justify-content:space-between;align-items:center;gap:8px;padding:9px 10px;display:flex}.ratio-item span{color:#475069;font-size:12px}.ratio-item input{border:1px solid var(--line);text-align:center;border-radius:9px;outline:none;width:58px;height:32px;padding:0 7px}.ratio-item input:focus{border-color:var(--brand);box-shadow:0 0 0 3px #2563eb1a}.chip{border:1px solid var(--line);color:#667085;background:#fff;border-radius:12px;min-height:38px;transition:all .16s}.chip:hover{background:#f8fbff;border-color:#c7d6f5}.chip.active{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-strong);font-weight:700;box-shadow:0 4px 12px #2563eb1a}.primary{color:#fff;background:linear-gradient(135deg,#2563eb,#1d4ed8);border:0;border-radius:13px;width:100%;min-height:46px;font-weight:700;transition:transform .16s,box-shadow .16s;box-shadow:0 10px 22px #2563eb3d}.primary:hover{transform:translateY(-1px);box-shadow:0 14px 28px #2563eb4d}.primary:active{transform:translateY(0)}.primary:disabled{opacity:.55;cursor:not-allowed;transform:none}.ghost{border:1px solid var(--line);color:#475069;background:#fff;border-radius:12px;width:100%;min-height:40px;transition:background .16s,border-color .16s}.ghost:hover{border-color:var(--line-strong);background:#f8faff}.memory-panel p{background:var(--surface-soft);border-left:3px solid var(--brand);color:#4b5563;border-radius:10px;margin:0 0 12px;padding:10px 12px;font-size:12px;line-height:1.55}.exam-panel p{margin:8px 0}.progress-info{color:var(--muted);justify-content:space-between;align-items:center;margin-bottom:8px;font-size:12px;display:flex}.progress-info strong{color:var(--brand);font-size:16px}.progress-track{background:#edf0f8;border-radius:999px;height:8px;margin-bottom:12px;overflow:hidden}.progress-fill{border-radius:inherit;background:linear-gradient(90deg,#2563eb,#60a5fa);height:100%;transition:width .3s}.score-row{flex-wrap:wrap;gap:8px;margin-bottom:12px;font-size:12px;display:flex}.score-row span{color:#475069;background:#f4f6fb;border-radius:999px;padding:5px 8px}.score-row .score-good{color:var(--good);background:var(--good-soft)}.score-row .score-bad{color:var(--bad);background:var(--bad-soft)}.outline-panel{scrollbar-width:thin;max-height:520px;overflow-y:auto}.outline-group{margin-bottom:14px}.outline-group-head{border-bottom:1px solid var(--line);color:#6b7280;justify-content:space-between;align-items:center;margin:0 0 8px;padding-bottom:6px;font-size:12px;display:flex}.outline-group-head span:first-child{color:#374151;font-weight:700}.question-nav-grid{grid-template-columns:repeat(6,1fr);gap:7px;display:grid}.question-number{aspect-ratio:1;border:1px solid var(--line);color:#6b7280;background:#fff;border-radius:10px;min-width:0;font-size:12px;font-weight:800;transition:transform .12s,border-color .12s,background .12s;position:relative}.question-number:hover{border-color:#b7c8ef;transform:translateY(-1px)}.question-number.current{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-strong);box-shadow:0 0 0 3px #2563eb1f}.question-number.answered{color:#374151;border-color:#d1d5db}.question-number.answered.correct{background:var(--good-soft);color:var(--good);border-color:#86efac}.question-number.answered.wrong{background:var(--bad-soft);color:var(--bad);border-color:#fda4af}.question-number.answered.neutral{background:var(--warn-soft);color:var(--warn);border-color:#fcd34d}.question-number:after{content:"";background:#d1d5db;border-radius:50%;width:5px;height:5px;position:absolute;top:5px;right:5px}.question-number.answered:after{background:currentColor}.main-area{min-width:0}.empty-state{text-align:center;min-height:520px;color:var(--muted);border:1px solid var(--line);box-shadow:var(--shadow-lg);background:#ffffffc7;border-radius:28px;flex-direction:column;justify-content:center;align-items:center;padding:32px;display:flex}.empty-state:before{content:"📘";background:var(--brand-soft);border-radius:24px;width:72px;height:72px;margin-bottom:18px;font-size:34px;line-height:72px;display:block}.empty-state h2{color:var(--text);margin:0 0 8px;font-size:24px}.question-card{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-lg);border-radius:26px;padding:30px}.question-meta{flex-wrap:wrap;gap:8px;margin-bottom:20px;display:flex}.question-meta span{color:#475069;background:#f1f4fb;border-radius:999px;padding:6px 10px;font-size:12px;font-weight:600}.question-text{white-space:pre-wrap;color:#111827;margin:0 0 24px;font-size:20px;line-height:1.7}.options{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-bottom:22px;display:grid}.option{text-align:left;border:1px solid var(--line);width:100%;min-height:52px;color:var(--text);background:#fff;border-radius:14px;align-items:flex-start;gap:10px;padding:14px 15px;line-height:1.55;transition:border-color .16s,background .16s,transform .16s;display:flex}.option:hover{background:#f8fbff;border-color:#b8c9f3;transform:translateY(-1px)}.option-letter{color:#374151;background:#f3f4f6;border-radius:8px;flex:0 0 25px;justify-content:center;align-items:center;width:25px;height:25px;font-size:12px;font-weight:800;display:inline-flex}.option-text{flex:1;min-width:0}.option.selected{border-color:var(--brand);background:var(--brand-soft)}.option.selected .option-letter{background:var(--brand);color:#fff}.option.correct{background:var(--good-soft);color:#14532d;border-color:#86efac}.option.correct .option-letter{background:var(--good);color:#fff}.option.wrong{background:var(--bad-soft);color:#991b1b;border-color:#fda4af}.option.wrong .option-letter{background:var(--bad);color:#fff}.answer-input{border:1px solid var(--line);resize:vertical;width:100%;line-height:1.6;font:inherit;border-radius:14px;outline:none;margin-bottom:18px;padding:14px;transition:border-color .16s,box-shadow .16s}.answer-input:focus{border-color:var(--brand);box-shadow:0 0 0 4px #2563eb1a}.result-block{background:#f8faff;border:1px solid #e7ebf7;border-radius:16px;margin-top:22px;padding:20px}.result-title{margin-bottom:14px}.good{color:var(--good)}.bad{color:var(--bad)}.self-title{color:var(--warn)}.answer-block,.explain-block,.tip-block{margin-bottom:14px;line-height:1.65}.answer-block strong,.explain-block strong,.tip-block strong{margin-right:6px;display:inline-block}.tip-block{background:var(--warn-soft);color:#92400e;border-radius:12px;padding:12px 14px}.self-mark{color:#374151;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:18px;display:flex}.mini{color:#fff;border:0;border-radius:999px;padding:7px 13px;font-weight:700}.good-btn{background:var(--good)}.bad-btn{background:var(--bad)}@media (width<=840px){.topbar{flex-direction:column;align-items:flex-start;padding:18px 20px}.layout{grid-template-columns:1fr;width:min(100% - 24px,1200px);margin:18px auto 32px}.sidebar{position:static}.question-card{padding:20px}.options{grid-template-columns:1fr}}
