:root{--bg: #f4f6fb;--panel: #ffffff;--border: #e5e8ef;--text: #1a1f2e;--muted: #6b7280;--primary: #4f6ef7;--primary-dark: #3d57d9;--primary-soft: #eef2ff;--danger: #e5484d;--danger-soft: #fdecec;--success: #16a34a;--success-soft: #e8f7ee;--warning: #d97706;--warning-soft: #fdf3e3;--radius: 12px;--shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 4px 16px rgba(16, 24, 40, .06);--shadow-lg: 0 8px 30px rgba(16, 24, 40, .12)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}h1,h2,h3,h4{margin:0;font-weight:700}button{font-family:inherit;cursor:pointer}input,textarea,select{font-family:inherit;font-size:14px}.center-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;color:var(--muted)}.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:linear-gradient(135deg,#eef2ff,#f4f6fb 40%,#e8f0ff)}.auth-card{width:100%;max-width:400px;background:var(--panel);border:1px solid var(--border);border-radius:16px;padding:32px;box-shadow:var(--shadow-lg)}.auth-card h1{font-size:22px;margin-bottom:4px}.auth-card .sub{color:var(--muted);margin-bottom:24px;font-size:14px}.app-shell{display:flex;min-height:100vh}.sidebar{width:240px;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:20px 12px;position:sticky;top:0;height:100vh}.brand{display:flex;align-items:center;gap:10px;padding:4px 12px 20px}.brand .logo{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--primary),#8b5cf6);display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:800}.brand .name{font-weight:800;font-size:16px}.nav{display:flex;flex-direction:column;gap:4px}.nav a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;color:var(--muted);font-weight:600;font-size:14px}.nav a:hover{background:var(--primary-soft);color:var(--primary)}.nav a.active{background:var(--primary);color:#fff}.sidebar .user-box{margin-top:auto;padding:12px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:8px}.sidebar .user-box .who{font-weight:700;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sidebar .user-box .mail{color:var(--muted);font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.main{flex:1;padding:28px 32px;max-width:1000px}.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;gap:16px;flex-wrap:wrap}.page-head h1{font-size:22px}.page-head .hint{color:var(--muted);font-size:13px;margin-top:4px}.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.card+.card{margin-top:16px}.card h3{font-size:15px;margin-bottom:12px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}@media (max-width: 720px){.grid-2{grid-template-columns:1fr}}.field{margin-bottom:14px}.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:#374151}.field input,.field textarea,.field select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--text);outline:none}.field input:focus,.field 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var(--border);font-size:13px}.exercise:last-child{border-bottom:none}.exercise .en{font-weight:600}.exercise .em{color:var(--muted);white-space:nowrap}.muted{color:var(--muted)}.small{font-size:12px}.mt{margin-top:12px}.mb{margin-bottom:12px}.flex{display:flex;gap:10px;align-items:center}.space-between{display:flex;justify-content:space-between;align-items:center;gap:12px}