:root{--primary: #6366f1;--primary-light: #eef2ff;--primary-dark: #4f46e5;--card: #ffffff;--text-muted: #94a3b8;--border-light: #f1f5f9;--success-light: #f0fdf4;--warning: #f59e0b;--warning-light: #fffbeb;--danger-light: #fef2f2;--info: #3b82f6;--info-light: #eff6ff;--purple: #8b5cf6;--purple-light: #f5f3ff;--radius: 12px;--radius-sm: 8px;--radius-xs: 6px;--shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);--shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.04);--sidebar-width: 240px;--header-height: 60px;--bottom-nav-height: 64px;--transition: all .2s ease;--bg: #f1f5f9;--surface: var(--card);--text: #1e293b;--text-secondary: #475569;--accent: var(--primary);--accent-text: #FFFFFF;--danger: #dc2626;--success: #15803d;--border: #e2e8f0;--border-strong: #94a3b8;--focus: var(--primary);--accent-active-bg: var(--primary-dark);--radius-btn: var(--radius-sm);--radius-card: var(--radius);--shadow-card: var(--shadow);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--space-7: 48px;--highlight-bg: rgba(99, 102, 241, .12);--highlight-warn-bg: #fef2f2;--highlight-ok-bg: #f0fdf4;--font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;--font-en: Tahoma, Geneva, -apple-system, "PingFang SC", sans-serif;--font-size-body: 15px;--font-size-en: 17px;--font-size-aux: 13px;--touch-min: 44px;--btn-primary-h: 44px;--content-max: 880px;--reading-max: 1320px;--nav-h: var(--bottom-nav-height)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font-family);font-size:var(--font-size-body);line-height:1.6;color:var(--text);background:var(--bg)}h1{font-size:1.375rem;margin:0 0 var(--space-4)}h2{font-size:1.125rem;margin:var(--space-5) 0 var(--space-3)}p{margin:0 0 var(--space-3)}a{color:var(--accent)}button{font-family:inherit}:focus-visible{outline:2px solid var(--focus);outline-offset:2px;border-radius:4px}#root{min-height:100dvh;display:flex;flex-direction:column}.app-main{flex:1;width:100%;max-width:var(--content-max);margin:0 auto;padding:var(--space-4) var(--space-4) calc(var(--nav-h) + var(--space-6) + env(safe-area-inset-bottom))}.app-main.wide{max-width:var(--reading-max)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-height:var(--touch-min);padding:var(--space-2) var(--space-4);border:1px solid var(--border-strong);border-radius:var(--radius-btn);background:var(--surface);color:var(--text);font-size:1rem;cursor:pointer;text-decoration:none}.btn-primary{min-height:var(--btn-primary-h);width:100%;background:var(--accent);color:var(--accent-text);border-color:var(--accent);font-weight:600}.btn-ghost{border-color:transparent;color:var(--accent)}.btn-danger{color:var(--danger);border-color:var(--danger)}.btn[disabled]{opacity:.5;cursor:not-allowed}.btn+.btn{margin-left:0}.btn-row{display:flex;flex-wrap:wrap;gap:var(--space-3);margin-top:var(--space-4)}.btn-row .btn{flex:1 1 auto}.card{background:var(--surface);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:var(--space-4);margin-bottom:var(--space-4)}.card-title{font-weight:600;margin:0 0 var(--space-2)}.aux{color:var(--text-secondary);font-size:var(--font-size-aux)}.en{font-size:var(--font-size-en)}.field{margin-bottom:var(--space-4)}.field label{display:block;font-weight:600;margin-bottom:var(--space-1)}.field .aux{font-weight:400}input[type=text],input[type=password],input[type=number],input[type=date],textarea,select{width:100%;min-height:var(--touch-min);font-size:1rem;font-family:inherit;color:var(--text);padding:var(--space-3);border:1px solid var(--border-strong);border-radius:var(--radius-btn);background:var(--surface)}textarea{min-height:160px;line-height:1.6;resize:vertical}.form-error{color:var(--danger);font-size:var(--font-size-aux);margin-top:var(--space-1)}.option-row{display:flex;align-items:flex-start;gap:var(--space-3);min-height:var(--touch-min);padding:var(--space-3);border:1px solid var(--border);border-radius:var(--radius-btn);margin-bottom:var(--space-2);cursor:pointer;background:var(--surface)}.option-row input{margin-top:6px;min-width:18px;min-height:18px}.option-row.selected{border-color:var(--accent);background:var(--highlight-bg)}.option-row.correct{border-color:var(--success);background:var(--highlight-ok-bg)}.option-row.wrong{border-color:var(--danger);background:var(--highlight-warn-bg)}.option-row .opt-id{font-weight:600}.state-block{text-align:center;padding:var(--space-7) var(--space-4);color:var(--text-secondary)}.state-block .state-title{font-size:1.125rem;color:var(--text);margin-bottom:var(--space-2)}.inline-error{color:var(--danger);background:var(--highlight-warn-bg);border:1px solid var(--danger);border-radius:var(--radius-btn);padding:var(--space-3);margin:var(--space-3) 0}.inline-ok{color:var(--success);background:var(--highlight-ok-bg);border:1px solid var(--success);border-radius:var(--radius-btn);padding:var(--space-3);margin:var(--space-3) 0}.pill{display:inline-flex;align-items:center;min-height:28px;padding:2px var(--space-3);border-radius:999px;font-size:var(--font-size-aux);border:1px solid var(--border-strong);color:var(--text-secondary);background:var(--surface)}.pill.ok{color:var(--success);border-color:var(--success)}.pill.warn{color:var(--danger);border-color:var(--danger)}.pill.accent{color:var(--accent);border-color:var(--accent)}.hl{background:var(--highlight-bg);border-radius:3px;padding:0 1px}.hl-ok{background:var(--highlight-ok-bg);border-radius:3px;padding:0 1px}.hl-warn{background:var(--highlight-warn-bg);border-radius:3px;padding:0 1px}.save-bar{position:sticky;bottom:calc(var(--nav-h) + env(safe-area-inset-bottom));display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-btn);box-shadow:var(--shadow-card);font-size:var(--font-size-aux);color:var(--text-secondary);margin-top:var(--space-3);z-index:5}.save-bar .dot{width:8px;height:8px;border-radius:50%;background:var(--border-strong);flex:none}.save-bar[data-state=saving] .dot{background:var(--accent)}.save-bar[data-state=server] .dot{background:var(--success)}.save-bar[data-state=device] .dot{background:var(--text-secondary)}.save-bar[data-state=failed]{color:var(--danger);border-color:var(--danger)}.save-bar[data-state=failed] .dot{background:var(--danger)}.save-bar .retry{margin-left:auto}.bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:10;display:flex;background:var(--surface);border-top:1px solid var(--border);padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:var(--nav-h);color:var(--text-secondary);text-decoration:none;font-size:var(--font-size-aux);gap:2px}.bottom-nav a .nav-icon{font-size:1.25rem;line-height:1}.bottom-nav a.active{color:var(--accent);font-weight:600}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;background:#00000059;display:flex;align-items:flex-end;justify-content:center}.modal{background:var(--surface);border-radius:var(--radius-card) var(--radius-card) 0 0;width:100%;max-width:var(--content-max);max-height:85dvh;overflow:auto;padding:var(--space-5) var(--space-4) calc(var(--space-5) + env(safe-area-inset-bottom))}.modal h2{margin-top:0}.ws-head{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-2);margin-bottom:var(--space-3)}.ws-head .spacer{flex:1}.item-chips{display:flex;flex-wrap:wrap;gap:var(--space-2);margin-bottom:var(--space-4)}.item-chip{min-width:var(--touch-min);min-height:var(--touch-min);border:1px solid var(--border-strong);border-radius:var(--radius-btn);background:var(--surface);cursor:pointer;font-size:var(--font-size-aux)}.item-chip.active{border-color:var(--accent-active-bg);background:var(--accent-active-bg);color:var(--accent-text);font-weight:600}.item-chip.done{border-color:var(--success);color:var(--success)}.sentence-text{font-size:var(--font-size-en);line-height:1.8}.stem{font-size:var(--font-size-en);margin-bottom:var(--space-4)}.reading-toggle{display:flex;gap:var(--space-2);margin-bottom:var(--space-3)}.reading-toggle .btn{flex:1}.reading-panes .pane-scroll{max-height:60dvh;overflow:auto}@media (min-width: 1024px){.reading-toggle{display:none}.reading-panes{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-4);max-width:var(--reading-max)}.reading-panes .pane-scroll{max-height:70dvh}.reading-panes [hidden]{display:block!important}}.passage p{margin:0 0 var(--space-3)}.passage .sent{display:inline}.side-nav{display:none}@media (min-width: 1024px){#root{flex-direction:row}.side-nav{display:flex;flex-direction:column;gap:var(--space-1);width:200px;flex:none;padding:var(--space-5) var(--space-3);border-right:1px solid var(--border);background:var(--surface);min-height:100dvh;position:sticky;top:0;align-self:flex-start}.side-nav a{display:flex;align-items:center;gap:var(--space-2);min-height:var(--touch-min);padding:0 var(--space-3);border-radius:var(--radius-btn);color:var(--text);text-decoration:none}.side-nav a.active{background:var(--accent-active-bg);color:var(--accent-text);font-weight:600}.side-nav .brand{font-weight:700;padding:0 var(--space-3) var(--space-4)}.bottom-nav{display:none}.app-main{padding-bottom:var(--space-6)}.save-bar{bottom:var(--space-3)}}.metric-grid{display:grid;grid-template-columns:1fr;gap:var(--space-3)}@media (min-width: 640px){.metric-grid{grid-template-columns:1fr 1fr}}.metric-num{font-size:1.375rem;font-weight:700}.seg{display:flex;gap:var(--space-2);margin-bottom:var(--space-4)}.seg .btn{flex:1}.btn.active{background:var(--accent-active-bg);color:var(--accent-text);border-color:var(--accent-active-bg);font-weight:600}details.card summary{cursor:pointer;font-weight:600;min-height:var(--touch-min);display:flex;align-items:center}.wordcard-lemma{font-size:1.5rem;font-weight:700}.vocab-reveal{border-top:1px solid var(--border);margin-top:var(--space-4);padding-top:var(--space-4)}.table-scroll{overflow-x:auto;max-width:100%}.table-lite{width:100%;border-collapse:collapse;font-size:var(--font-size-aux)}.table-lite th,.table-lite td{text-align:left;padding:var(--space-2);border-bottom:1px solid var(--border);vertical-align:top}pre.payload-view{white-space:pre-wrap;word-break:break-word;font-size:var(--font-size-aux);background:var(--bg);border-radius:var(--radius-btn);padding:var(--space-3);max-height:50dvh;overflow:auto}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:var(--space-3);top:var(--space-3);z-index:30;background:var(--surface);padding:var(--space-2) var(--space-3);border-radius:var(--radius-btn)}.btn:active{transform:scale(.98)}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation:none!important;transition:none!important}.btn:active{transform:none}}.student-layout{display:flex;flex-direction:column;min-height:100vh}.student-header{display:flex;justify-content:space-between;align-items:center;padding:0 24px;height:var(--header-height);background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:200}.student-header-left{display:flex;align-items:center;gap:12px}.student-logo{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--text);flex-shrink:0}.logo-icon{font-size:22px}.logo-text{font-size:18px;font-weight:700;color:var(--primary);letter-spacing:-.5px;white-space:nowrap}.student-logo.brand-row{gap:10px}.ziai-brand-logo{height:20px;width:auto;flex-shrink:0}.brand-divider{width:1px;height:22px;background:var(--border);flex-shrink:0}.qu-brand-logo{height:28px;width:auto;flex-shrink:0}.student-header-center{display:flex;align-items:center}.current-subject{background:var(--primary-light);color:var(--primary);padding:4px 14px;border-radius:20px;font-size:13px;font-weight:600;white-space:nowrap}.student-header-right{display:flex;align-items:center;gap:16px}.streak-badge{display:flex;align-items:center;gap:4px;background:#fff7ed;color:#ea580c;padding:4px 12px;border-radius:20px;font-size:13px;font-weight:600;white-space:nowrap}.svip-badge{display:flex;align-items:center;gap:4px;background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;padding:4px 12px;border-radius:20px;font-size:12px;font-weight:700;text-decoration:none;letter-spacing:.5px;transition:transform .2s,box-shadow .2s;white-space:nowrap}.svip-badge:hover{transform:scale(1.05);box-shadow:0 2px 8px #d977064d;text-decoration:none;color:#fff}.svip-crown{font-size:14px}.vip-badge-sm{display:flex;align-items:center;gap:4px;background:linear-gradient(135deg,#1b4f72,#2a6892);color:#fff;padding:4px 12px;border-radius:20px;font-size:12px;font-weight:700;text-decoration:none;transition:transform .2s,box-shadow .2s;white-space:nowrap}.vip-badge-sm:hover{transform:scale(1.05);box-shadow:0 2px 8px #1b4f724d;text-decoration:none;color:#fff}.sidebar-toggle{display:none;flex-direction:column;gap:4px;background:none;border:none;cursor:pointer;padding:8px;border-radius:6px}.sidebar-toggle:hover{background:var(--bg)}.sidebar-toggle span{width:20px;height:2px;background:var(--text);border-radius:2px;transition:var(--transition)}.student-avatar-dropdown{position:relative}.avatar-btn{display:flex;align-items:center;gap:8px;background:none;border:none;cursor:pointer;padding:4px 8px;border-radius:8px;transition:var(--transition)}.avatar-btn:hover{background:var(--bg)}.avatar-circle{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#a78bfa);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600}.avatar-name{font-size:14px;color:var(--text);font-weight:500}.arrow-down{font-size:12px;color:var(--text-muted)}.user-dropdown{display:none;position:absolute;right:0;top:100%;margin-top:8px;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow-lg);border:1px solid var(--border);min-width:180px;padding:8px;z-index:300}.user-dropdown.show{display:block}.user-dropdown a{display:block;padding:10px 14px;border-radius:var(--radius-xs);color:var(--text);font-size:14px;transition:var(--transition)}.user-dropdown a:hover{background:var(--bg)}.user-dropdown hr{border:none;border-top:1px solid var(--border);margin:4px 0}.user-dropdown .logout-link{color:var(--danger)}.student-body{display:flex;flex:1;min-height:calc(100vh - var(--header-height))}.student-sidebar{width:var(--sidebar-width);background:var(--card);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0;position:sticky;top:var(--header-height);height:calc(100vh - var(--header-height));overflow:hidden;transition:var(--transition)}.sidebar-scroll{flex:1;overflow-y:auto;padding:16px 12px}.sidebar-scroll::-webkit-scrollbar{width:4px}.sidebar-scroll::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.sidebar-group{margin-bottom:8px}.sidebar-group-title{font-size:11px;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;padding:8px 14px 6px}.sidebar-nav{display:flex;flex-direction:column;gap:2px}.sidebar-item{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:var(--radius-sm);color:var(--text-secondary);font-size:14px;font-weight:450;transition:var(--transition);text-decoration:none;position:relative}.sidebar-item:hover{background:var(--bg);color:var(--text)}.sidebar-item.active{background:var(--primary-light);color:var(--primary);font-weight:600}.sidebar-item.active:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:20px;background:var(--primary);border-radius:0 3px 3px 0}.sidebar-icon{font-size:18px;width:24px;text-align:center;flex-shrink:0}.sidebar-label{flex:1}.sidebar-badge{background:var(--danger);color:#fff;font-size:11px;font-weight:700;padding:2px 7px;border-radius:10px;min-width:20px;text-align:center}.sidebar-footer{padding:16px;border-top:1px solid var(--border)}.vocab-level{text-align:center;padding:12px;background:linear-gradient(135deg,#f5f3ff,#eef2ff);border-radius:var(--radius-sm)}.vocab-level-label{font-size:12px;color:var(--text-muted);margin-bottom:4px}.vocab-level-stars{font-size:16px;margin-bottom:2px}.vocab-level-name{font-size:13px;font-weight:600;color:var(--purple)}.sidebar-footer .logout-item{color:var(--danger);margin:0 -4px}.sidebar-footer .logout-item:hover{background:var(--danger-light);color:var(--danger)}.logout-modal-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;z-index:400;align-items:center;justify-content:center;padding:24px}.logout-modal-overlay.show{display:flex}.logout-modal{background:var(--card);border-radius:12px;padding:24px 20px;width:min(320px,100%);text-align:center;box-shadow:var(--shadow-md)}.logout-modal-title{font-size:16px;font-weight:700;margin-bottom:8px}.logout-modal-desc{font-size:13px;color:var(--text-muted);margin-bottom:20px}.logout-modal-actions{display:flex;gap:12px}.logout-modal-actions .btn{flex:1}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{background:#c9302c;color:#fff}.student-main{flex:1;padding:24px;min-width:0;overflow-x:auto}.sidebar-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:149;opacity:0;transition:opacity .3s}.sidebar-overlay.show{display:block;opacity:1}.mobile-bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;height:var(--bottom-nav-height);background:var(--card);border-top:1px solid var(--border);z-index:200;grid-template-columns:repeat(5,minmax(0,1fr));width:100%;align-items:stretch;padding:0 8px;padding-bottom:env(safe-area-inset-bottom,0)}.mobile-nav-item{display:flex;min-width:0;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:6px 2px;border-radius:8px;color:var(--text-muted);font-size:11px;transition:var(--transition);text-decoration:none;-webkit-tap-highlight-color:transparent}.mobile-nav-item.active{color:var(--primary)}.mobile-nav-icon{font-size:22px;line-height:1}.mobile-nav-label{max-width:100%;font-weight:500;white-space:nowrap;line-height:1.2;font-size:clamp(11px,3vw,13px)}.page-title{font-size:22px;font-weight:700;color:var(--text);margin-bottom:4px}.page-subtitle{font-size:14px;color:var(--text-muted);margin-bottom:24px}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-bottom:20px}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.card-title{font-size:16px;font-weight:700;color:var(--text)}.card-link{font-size:13px;color:var(--primary);font-weight:500}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-bottom:24px}.stat-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;display:flex;align-items:center;gap:16px;transition:var(--transition)}.stat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.stat-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}.stat-icon.blue{background:var(--info-light)}.stat-icon.green{background:var(--success-light)}.stat-icon.orange{background:var(--warning-light)}.stat-icon.purple{background:var(--purple-light)}.stat-icon.red{background:var(--danger-light)}.stat-info{flex:1;min-width:0}.stat-value{font-size:24px;font-weight:700;color:var(--text);line-height:1.2}.stat-label{font-size:13px;color:var(--text-muted);margin-top:2px}.task-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;margin-bottom:24px}.task-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;display:flex;flex-direction:column;gap:12px;transition:var(--transition);border:2px 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