:root{--bg: #f6f7fb;--surface: #ffffff;--border: #e4e7ef;--text: #1f2430;--muted: #6b7280;--primary: #6366f1;--primary-dark: #4f46e5;--danger: #dc2626;--mark: #fde68a;--radius: 12px;--shadow: 0 1px 3px rgb(16 24 40 / .08), 0 1px 2px rgb(16 24 40 / .04)}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}#root{min-height:100vh}.layout{min-height:100vh;display:flex;flex-direction:column}.topbar{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.topbar-inner{max-width:880px;margin:0 auto;padding:0 20px;height:56px;display:flex;align-items:center;gap:24px}.logo{font-weight:700;font-size:17px;white-space:nowrap}.nav{display:flex;gap:4px;flex:1}.nav a{padding:6px 14px;border-radius:8px;text-decoration:none;color:var(--muted);font-size:15px;display:inline-flex;align-items:center;gap:6px}.nav a:hover{color:var(--text);background:var(--bg)}.nav a.active{color:var(--primary-dark);background:#eef0ff;font-weight:600}.badge{background:var(--danger);color:#fff;border-radius:999px;font-size:12px;padding:0 7px;line-height:18px;font-weight:600}.topbar-right{display:flex;align-items:center;gap:10px}.user-email{color:var(--muted);font-size:13px;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.main{flex:1;width:100%}.page{max-width:880px;margin:0 auto;padding:24px 20px 60px}.page-loading{text-align:center;padding:120px 0;color:var(--muted)}.btn{border:1px solid transparent;border-radius:10px;padding:9px 18px;font-size:14px;font-weight:600;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:6px;transition:all .15s;font-family:inherit}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-dark)}.btn-secondary{background:var(--surface);border-color:var(--border);color:var(--text)}.btn-secondary:hover:not(:disabled){border-color:var(--primary);color:var(--primary-dark)}.btn-ghost{background:transparent;color:var(--muted)}.btn-ghost:hover{color:var(--danger);background:var(--bg)}.btn-icon{background:transparent;border:none;cursor:pointer;font-size:16px;padding:4px;border-radius:6px}.btn-icon:hover{background:var(--bg)}.btn-danger:hover{background:#fee2e2}.linklike{background:none;border:none;color:var(--muted);cursor:pointer;font-size:12px;padding:0;text-decoration:underline;font-family:inherit}.linklike:hover{color:var(--danger)}.btn kbd{background:#ffffff40;border-radius:4px;font-size:11px;padding:1px 5px;font-family:inherit}.tag{background:var(--bg);color:var(--muted);font-size:12px;border-radius:999px;padding:2px 10px;white-space:nowrap}.tag-due{background:#fee2e2;color:var(--danger);font-weight:600}.muted{color:var(--muted);font-size:14px}.center{text-align:center}.spacer{flex:1}mark{background:var(--mark);border-radius:3px;padding:0 2px}.form-error{color:var(--danger);background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:8px 12px;font-size:14px;margin:0}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:36px;width:100%;max-width:380px;display:flex;flex-direction:column;gap:16px}.auth-card h1{margin:0;font-size:24px;text-align:center}.auth-sub{margin:0;color:var(--muted);font-size:14px;text-align:center}.auth-card label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:500}.auth-alt{text-align:center;font-size:14px;color:var(--muted);margin:0}.auth-alt a{color:var(--primary-dark)}input{border:1px solid var(--border);border-radius:10px;padding:10px 12px;font-size:14px;font-family:inherit;outline:none;background:var(--surface);color:var(--text)}input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6366f126}.toolbar{display:flex;align-items:center;gap:12px;margin-bottom:20px;flex-wrap:wrap}.search{flex:1;min-width:200px;max-width:320px}.tabs{display:flex;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:3px;gap:2px}.tab{border:none;background:transparent;padding:6px 14px;border-radius:8px;cursor:pointer;font-size:14px;color:var(--muted);font-family:inherit}.tab.active{background:#eef0ff;color:var(--primary-dark);font-weight:600}.empty{text-align:center;padding:60px 20px;background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius)}.word-list{display:flex;flex-direction:column;gap:14px}.word-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px}.word-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.word-title{margin:0;font-size:20px}.phonetic{color:var(--muted);font-size:14px;font-family:Segoe UI,sans-serif}.pos{color:var(--primary-dark);font-style:italic;font-size:13px;margin-right:6px;font-family:Georgia,serif}.word-def{margin:8px 0 0;font-size:14px;color:#374151}.ctx-list{margin-top:12px;display:flex;flex-direction:column;gap:10px;border-top:1px solid var(--border);padding-top:12px}.ctx-sentence{margin:0;font-size:15px}.ctx-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted);flex-wrap:wrap}.ctx-meta a{color:var(--primary-dark);text-decoration:none}.ctx-meta a:hover{text-decoration:underline}.ctx-title{max-width:400px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.load-more{display:block;margin:20px auto 0}.review-page{max-width:640px}.review-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px;flex-wrap:wrap}.flashcard{background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);min-height:320px;padding:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;text-align:center}.card-word{margin:0;font-size:40px;word-break:break-word}.card-front{display:flex;flex-direction:column;align-items:center;gap:24px;width:100%}.card-back{display:flex;flex-direction:column;align-items:center;gap:14px;width:100%}.card-def{display:flex;align-items:center;gap:10px}.cloze-sentence{font-size:22px;margin:0;line-height:1.8}.blank{color:var(--primary-dark);font-weight:700;letter-spacing:2px}.hint{font-size:13px}.sense-list{margin:0;padding-left:20px;text-align:left;font-size:15px;max-width:100%}.sense-list li{margin-bottom:6px}.review-done{text-align:center;padding:60px 20px;background:var(--surface);border:1px solid var(--border);border-radius:16px}.review-done h1{margin:0 0 12px}.rating-row{display:flex;gap:10px;margin-top:20px;justify-content:center;flex-wrap:wrap}.rate-again{background:#fee2e2;color:#b91c1c}.rate-again:hover:not(:disabled){background:#fecaca}.rate-hard{background:#fef3c7;color:#b45309}.rate-hard:hover:not(:disabled){background:#fde68a}.rate-good{background:#dcfce7;color:#15803d}.rate-good:hover:not(:disabled){background:#bbf7d0}.rate-easy{background:#dbeafe;color:#1d4ed8}.rate-easy:hover:not(:disabled){background:#bfdbfe}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px;margin-bottom:24px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;display:flex;flex-direction:column;align-items:center;gap:4px}.stat-icon{font-size:24px}.stat-value{font-size:32px;font-weight:700;color:var(--primary-dark)}.stat-label{color:var(--muted);font-size:13px}@media(max-width:640px){.user-email{display:none}.nav{gap:0}.nav a{padding:6px 8px}}