:root{--bg: #f4f6fb;--card: #ffffff;--primary: #2f7df6;--primary-d: #1b5fd0;--ok: #16a34a;--bad: #ef4444;--text: #1f2430;--dim: #8a93a6;--line: #e6e9f2;--chip: #eef2fb}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:15px;line-height:1.55}#root{min-height:100vh}.app{max-width:520px;margin:0 auto;min-height:100vh;background:var(--bg);display:flex;flex-direction:column;position:relative;padding-bottom:64px}.app-header{background:linear-gradient(135deg,#2f7df6,#5b9bff);color:#fff;text-align:center;font-size:16px;font-weight:600;padding:12px 14px;letter-spacing:1px;display:flex;align-items:center;justify-content:space-between}.app-title{flex:1;text-align:center}.logout-btn{background:#ffffff2e;color:#fff;border:1px solid rgba(255,255,255,.5);border-radius:999px;padding:5px 14px;font-size:13px;cursor:pointer;white-space:nowrap}.logout-btn:active{background:#ffffff4d}.app-main{flex:1;padding:14px}.loading{text-align:center;padding:60px 20px;color:var(--dim)}.hero{background:linear-gradient(135deg,#2f7df6,#5b9bff);color:#fff;border-radius:16px;padding:22px 18px;text-align:center;box-shadow:0 8px 20px #2f7df640}.hero-title{font-size:22px;font-weight:700;letter-spacing:2px}.hero-sub{font-size:13px;opacity:.9;margin-top:4px}.hero-stats{display:flex;justify-content:center;gap:36px;margin-top:16px}.hero-stat{display:flex;flex-direction:column}.hero-num{font-size:26px;font-weight:700}.hero-cap{font-size:12px;opacity:.85}.subject-bars{margin:16px 0;background:var(--card);border-radius:14px;padding:14px;box-shadow:0 2px 10px #0000000a}.subject-bar{display:flex;align-items:center;gap:10px;margin:8px 0}.sb-name{width:84px;font-size:13px;color:var(--dim);flex-shrink:0}.sb-track{flex:1;height:8px;background:var(--line);border-radius:4px;overflow:hidden}.sb-fill{height:100%;background:linear-gradient(90deg,#2f7df6,#5b9bff);border-radius:4px}.sb-count{width:42px;text-align:right;font-size:13px;font-weight:600}.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:6px}.feature-card{background:var(--card);border:none;border-radius:14px;padding:16px 12px;text-align:left;box-shadow:0 2px 10px #0000000a;display:flex;flex-direction:column;gap:4px;cursor:pointer;transition:transform .12s ease}.feature-card:active{transform:scale(.97)}.fc-icon{font-size:24px}.fc-title{font-size:15px;font-weight:700}.fc-desc{font-size:12px;color:var(--dim)}.setup-head{display:flex;align-items:center;gap:8px;margin-bottom:12px}.setup-head h2{font-size:17px;margin:0}.back-btn{border:none;background:transparent;color:var(--primary);font-size:15px;cursor:pointer;padding:4px 6px}.filter-block{margin-bottom:14px}.filter-label{font-size:13px;color:var(--dim);margin-bottom:8px;font-weight:600}.chip-row{display:flex;flex-wrap:wrap;gap:8px}.chip{border:1px solid var(--line);background:var(--card);color:var(--text);padding:7px 12px;border-radius:999px;font-size:13px;cursor:pointer;transition:all .12s ease}.chip.on{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}.pool-info{text-align:center;color:var(--dim);font-size:13px;margin:10px 0 16px}.pool-info b{color:var(--primary);font-size:16px}.pool-sub{color:var(--ok, #16a34a);font-size:12px;margin-left:4px}.start-btn{width:100%;border:none;background:var(--primary);color:#fff;font-size:16px;font-weight:700;padding:14px;border-radius:12px;cursor:pointer;box-shadow:0 6px 16px #2f7df64d}.start-btn:active{transform:scale(.99)}.start-btn.disabled{background:#c3c9d6;box-shadow:none;cursor:not-allowed}.start-btn.ghost{background:var(--card);color:var(--primary);border:1px solid var(--primary);box-shadow:none;margin-bottom:12px}.start-btn.danger-text{color:var(--bad);border-color:var(--bad);margin-top:16px}.hint{color:var(--dim);font-size:12px;margin-top:10px}.hint.center{text-align:center}.mock-intro{background:var(--card);border-radius:14px;padding:14px;margin-bottom:16px;box-shadow:0 2px 10px #0000000a}.mock-row{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--line);font-size:14px}.mock-row:last-child{border-bottom:none}.mock-row b{color:var(--primary)}.subject-bars.mini .sb-name{width:90px}.quiz-top{display:flex;align-items:center;gap:8px;margin-bottom:10px}.timer{background:#fff4e5;color:#d97706;font-weight:700;padding:5px 10px;border-radius:8px;font-size:14px}.timer.danger{background:#fde8e8;color:var(--bad);animation:blink 1s infinite}@keyframes blink{50%{opacity:.45}}.quiz-progress{flex:1;font-size:13px;color:var(--dim);text-align:center}.quiz-actions{display:flex;gap:6px}.mini-btn{border:1px solid var(--line);background:var(--card);color:var(--text);font-size:12px;padding:5px 9px;border-radius:8px;cursor:pointer}.q-meta{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}.tag{background:#eaf1ff;color:var(--primary);font-size:11px;padding:3px 8px;border-radius:6px}.tag.dim{background:var(--chip);color:var(--dim)}.tag.ok{background:#e7f7ec;color:var(--ok);margin-left:6px}.tag.bad{background:#fde8e8;color:var(--bad);margin-left:6px}.q-stem{background:var(--card);border-radius:12px;padding:16px;font-size:16px;line-height:1.7;box-shadow:0 2px 10px #0000000a;margin-bottom:12px}.options{display:flex;flex-direction:column;gap:10px}.option{display:flex;align-items:flex-start;gap:10px;background:var(--card);border:2px solid transparent;border-radius:12px;padding:14px;text-align:left;cursor:pointer;font-size:15px;box-shadow:0 2px 8px #0000000a;transition:border-color .12s ease,background .12s ease}.option.selected{border-color:var(--primary);background:#f0f6ff}.option.correct{border-color:var(--ok);background:#eafaf0}.option.wrong{border-color:var(--bad);background:#fef0f0}.opt-key{width:26px;height:26px;flex-shrink:0;border-radius:50%;background:var(--chip);color:var(--primary);font-weight:700;display:flex;align-items:center;justify-content:center;font-size:13px}.option.correct .opt-key{background:var(--ok);color:#fff}.option.wrong .opt-key{background:var(--bad);color:#fff}.opt-val{flex:1;line-height:1.55}.explain{margin-top:14px;background:#fffef5;border:1px solid #f3e9c4;border-radius:12px;padding:14px}.ex-head{font-size:14px;margin-bottom:8px}.ex-head b{color:var(--ok);font-size:16px}.ex-body{font-size:14px;color:#4a4a4a;line-height:1.7}.quiz-foot{display:flex;gap:8px;margin-top:16px}.foot-btn{flex:1;border:none;border-radius:10px;padding:13px;font-size:15px;font-weight:600;cursor:pointer}.foot-btn.primary{background:var(--primary);color:#fff}.foot-btn.ghost{background:var(--card);color:var(--text);border:1px solid var(--line)}.foot-btn.danger{background:var(--bad);color:#fff}.foot-btn:disabled{opacity:.45;cursor:not-allowed}.sheet-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:flex-end;justify-content:center;z-index:50}.sheet{background:var(--card);width:100%;max-width:520px;border-radius:16px 16px 0 0;padding:16px;max-height:74vh;overflow:auto}.sheet-head{display:flex;justify-content:space-between;align-items:center;font-weight:600;margin-bottom:12px}.sheet-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}.sheet-cell{aspect-ratio:1;border:1px solid var(--line);background:var(--card);border-radius:8px;font-size:13px;cursor:pointer;color:var(--text)}.sheet-cell.unanswered{background:#f1f3f8;color:var(--dim)}.sheet-cell.correct{background:#e7f7ec;border-color:var(--ok);color:var(--ok)}.sheet-cell.wrong{background:#fde8e8;border-color:var(--bad);color:var(--bad)}.sheet-cell.current{border-color:var(--primary);border-width:2px;color:var(--primary);font-weight:700}.sheet-legend{display:flex;justify-content:space-around;margin-top:14px;font-size:12px;color:var(--dim)}.sheet-legend span{display:flex;align-items:center;gap:4px}.dot{width:10px;height:10px;border-radius:50%;display:inline-block}.dot.current{background:var(--primary)}.dot.correct{background:var(--ok)}.dot.wrong{background:var(--bad)}.dot.unanswered{background:#c3c9d6}.result,.list-view{padding-top:4px}.score-card{background:linear-gradient(135deg,#16a34a,#4ade80);color:#fff;border-radius:16px;padding:26px;text-align:center;margin:12px 0;box-shadow:0 8px 20px #16a34a40}.score-num{font-size:44px;font-weight:800}.score-sub{font-size:13px;opacity:.92;margin-top:4px}.result-detail{display:flex;justify-content:space-around;background:var(--card);border-radius:14px;padding:16px;margin-bottom:16px;box-shadow:0 2px 10px #0000000a}.rd-item{display:flex;flex-direction:column;align-items:center;font-size:12px;color:var(--dim)}.rd-item b{font-size:22px;color:var(--text)}.rd-item b.ok{color:var(--ok)}.rd-item b.bad{color:var(--bad)}.empty{text-align:center;color:var(--dim);padding:50px 20px;font-size:14px}.q-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}.q-item{background:var(--card);border-radius:12px;padding:14px;box-shadow:0 2px 8px #0000000a}.q-item.leaving{opacity:.3}.q-item-meta{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}.q-item-stem{font-size:14px;line-height:1.6;margin-bottom:8px}.q-item-actions{display:flex;justify-content:flex-end}.section-title{font-size:14px;margin:18px 0 8px;color:var(--text)}.stat-bar-row{display:flex;align-items:center;gap:10px;margin:8px 0}.sbr-label{width:120px;font-size:12px;color:var(--dim);flex-shrink:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sbr-track{flex:1;height:10px;background:var(--line);border-radius:5px;overflow:hidden}.sbr-fill{height:100%;background:var(--primary);border-radius:5px}.sbr-num{width:110px;text-align:right;font-size:13px;font-weight:600}.sbr-sub{font-size:11px;color:var(--dim);font-weight:400}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:520px;background:var(--card);border-top:1px solid var(--line);display:flex;z-index:40}.nav-tab{flex:1;border:none;background:transparent;padding:8px 0;display:flex;flex-direction:column;align-items:center;gap:2px;color:var(--dim);cursor:pointer;font-size:11px}.nav-tab.active{color:var(--primary);font-weight:700}.nav-icon{font-size:19px}.word-card{text-align:center;margin:22px 0 10px}.word-text{font-size:34px;font-weight:800;color:var(--text);letter-spacing:.5px;word-break:break-word}.word-phon{font-size:16px;color:var(--dim);margin-top:8px;font-style:italic}.q-item-phon{color:var(--dim);font-weight:400;font-size:13px;margin-left:6px}.q-item-mean{color:var(--text);margin-top:4px;font-size:14px;line-height:1.6}.ex-phon{color:var(--dim);font-weight:400;font-style:italic}.ex-mean{margin-top:8px;line-height:1.7}.opt-val{word-break:break-word}.meaning-card .word-text{font-size:26px;font-weight:700;line-height:1.6}.meaning-card .word-phon{font-style:normal;color:var(--primary);font-size:15px;margin-top:10px;font-weight:600}.opt-phon{color:var(--dim);font-weight:400;font-size:12px;margin-left:6px}.ex-example{margin-top:14px;padding:12px 14px;background:var(--surface-2, #f5f7fb);border-left:3px solid var(--primary);border-radius:8px}.ex-ex-head{font-size:12px;color:var(--dim);margin-bottom:6px;font-weight:600}.ex-ex-en{font-size:15px;line-height:1.7;color:var(--text)}.ex-ex-zh{font-size:14px;line-height:1.7;color:var(--dim);margin-top:4px}.q-item-ex{margin-top:10px;padding:10px 12px;background:var(--surface-2, #f5f7fb);border-left:3px solid var(--primary);border-radius:8px}.q-item-ex-head{font-size:11px;color:var(--dim);margin-bottom:4px;font-weight:600}.q-item-ex-en{font-size:14px;line-height:1.6;color:var(--text)}.q-item-ex-zh{font-size:13px;line-height:1.6;color:var(--dim);margin-top:3px}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:linear-gradient(160deg,#eaf1ff,#f4f6fb 60%)}.login-card{width:100%;max-width:360px;background:var(--card);border-radius:18px;padding:28px 22px 22px;box-shadow:0 12px 30px #2f7df624;display:flex;flex-direction:column}.login-logo{font-size:40px;text-align:center;margin-bottom:6px}.login-card h2{margin:0;text-align:center;font-size:20px;color:var(--text)}.login-sub{margin:4px 0 18px;text-align:center;color:var(--dim);font-size:13px}.login-card label{font-size:13px;color:var(--dim);margin:10px 0 6px}.login-card input{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 12px;font-size:15px;outline:none;background:#fbfcff}.login-card input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #2f7df61f}.login-err{margin-top:12px;background:#fff1f1;color:var(--bad);border:1px solid #ffd6d6;border-radius:10px;padding:9px 12px;font-size:13px;text-align:center}.login-btn{margin-top:18px;border:none;border-radius:12px;background:linear-gradient(135deg,#2f7df6,#5b9bff);color:#fff;font-size:16px;font-weight:600;letter-spacing:4px;padding:12px 0;cursor:pointer}.login-btn:disabled{opacity:.6;cursor:default}.login-tip{margin-top:14px;font-size:12px;color:var(--dim);text-align:center;line-height:1.5}