:root{--primary: #4f46e5;--primary-light: #818cf8;--primary-dark: #3730a3;--secondary: #06b6d4;--accent: #f59e0b;--success: #10b981;--danger: #ef4444;--pink: #ec4899;--bg: #f3f4f6;--bg-card: #ffffff;--text: #1f2937;--text-light: #9ca3af;--text-muted: #6b7280;--border: #e5e7eb;--radius: 16px;--radius-sm: 10px;--shadow: 0 2px 8px rgba(0,0,0,.06);--shadow-md: 0 4px 16px rgba(0,0,0,.08);--shadow-lg: 0 8px 32px rgba(0,0,0,.12);--tab-height: 56px;--header-height: 52px}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{font-family:-apple-system,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;overflow-x:hidden;padding-bottom:calc(var(--tab-height) + env(safe-area-inset-bottom,0px));-webkit-font-smoothing:antialiased}.app-header{position:fixed;top:0;left:0;right:0;z-index:50;background:var(--bg-card);padding:0 16px;padding-top:env(safe-area-inset-top,0px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);height:calc(var(--header-height) + env(safe-area-inset-top,0px))}.app-header .header-left,.app-header .header-right{min-width:40px;display:flex;align-items:center;z-index:1}.app-header .header-right{justify-content:flex-end}.app-header h1{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);text-align:center;font-size:17px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:60%;padding:0 4px}.app-shell.has-header{padding-top:calc(var(--header-height) + env(safe-area-inset-top,0px))}.icon-btn{width:36px;height:36px;border-radius:50%;border:none;background:var(--bg);font-size:18px;display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative}.icon-btn .badge{position:absolute;top:-2px;right:-2px;min-width:16px;height:16px;background:var(--danger);color:#fff;font-size:10px;border-radius:8px;padding:0 4px;display:flex;align-items:center;justify-content:center;font-weight:600}#tabBar{position:fixed;bottom:0;left:0;right:0;height:var(--tab-height);background:var(--bg-card);border-top:1px solid var(--border);display:flex;z-index:100;padding-bottom:env(safe-area-inset-bottom,0);box-shadow:0 -2px 10px #0000000f}.tab-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;font-size:10px;color:var(--text-muted);cursor:pointer;transition:color .2s;border:none;background:none;padding:4px 0 2px;text-decoration:none;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}.tab-item .tab-icon{font-size:22px;line-height:1.2}.tab-item.active{color:var(--primary);font-weight:600}.tab-item.active .tab-icon{transform:scale(1.05)}.page{min-height:calc(100vh - var(--tab-height));padding-bottom:8px}.section-title{font-size:16px;font-weight:700;padding:16px 16px 8px}.section-subtitle{font-size:12px;color:var(--text-light);padding:0 16px 12px;margin-top:-4px}.card{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);margin:0 12px 12px;padding:16px}.card-plain{background:transparent;box-shadow:none;padding:0;margin:0 16px 12px}.card-gradient{color:#fff;border:none}.card-row{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--bg-card);border-radius:var(--radius-sm);box-shadow:var(--shadow);margin-bottom:8px;cursor:pointer;transition:transform .15s}.card-row:active{transform:scale(.98)}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:0 12px;margin-bottom:12px}.stat-item{background:var(--bg-card);border-radius:var(--radius-sm);padding:12px 8px;text-align:center;box-shadow:var(--shadow)}.stat-value{font-size:22px;font-weight:800;line-height:1.2}.stat-label{font-size:11px;color:var(--text-light);margin-top:2px}.progress-ring{position:relative;display:inline-flex;align-items:center;justify-content:center}.progress-ring svg{transform:rotate(-90deg)}.progress-ring .ring-text{position:absolute;font-size:14px;font-weight:700}.progress-bar{height:6px;background:var(--border);border-radius:3px;overflow:hidden}.progress-fill{height:100%;border-radius:3px;transition:width .6s ease}.pf-primary{background:var(--primary)}.pf-success{background:var(--success)}.pf-warning{background:var(--accent)}.pf-danger{background:var(--danger)}.pf-gradient{background:linear-gradient(90deg,var(--primary),var(--secondary))}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:12px 20px;border-radius:var(--radius-sm);font-size:15px;font-weight:600;border:none;cursor:pointer;font-family:inherit;transition:all .2s;text-decoration:none}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{opacity:.9}.btn-secondary{background:var(--bg);color:var(--text)}.btn-secondary:hover{opacity:.8}.btn-success{background:var(--success);color:#fff}.btn-accent{background:var(--accent);color:#fff}.btn-danger{background:var(--danger);color:#fff}.btn-sm{padding:8px 14px;font-size:13px;border-radius:8px}.btn-lg{padding:14px 24px;font-size:17px}.btn-block{width:100%;display:flex}.btn-round{border-radius:50px}.btn-ghost{background:transparent;color:var(--primary);padding:6px 10px}.btn-icon-only{width:40px;height:40px;padding:0;border-radius:50%}.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:600}.tag-primary{background:#4f46e51a;color:var(--primary)}.tag-success{background:#10b9811a;color:var(--success)}.tag-warning{background:#f59e0b1a;color:var(--accent)}.tag-danger{background:#ef44441a;color:var(--danger)}.tag-gray{background:var(--bg);color:var(--text-muted)}.g-primary{background:linear-gradient(135deg,#4f46e5,#818cf8)}.g-secondary{background:linear-gradient(135deg,#06b6d4,#22d3ee)}.g-accent{background:linear-gradient(135deg,#f59e0b,#f97316)}.g-pink{background:linear-gradient(135deg,#ec4899,#f472b6)}.g-success{background:linear-gradient(135deg,#10b981,#34d399)}.g-dark{background:linear-gradient(135deg,#1e293b,#334155)}.avatar{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px;color:#fff;flex-shrink:0}.avatar-sm{width:28px;height:28px;font-size:12px}.avatar-lg{width:56px;height:56px;font-size:22px}.list-item{display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid var(--border)}.list-item:last-child{border-bottom:none}.list-item-icon{width:40px;height:40px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}.list-item-content{flex:1;min-width:0}.list-item-title{font-size:14px;font-weight:600}.list-item-desc{font-size:12px;color:var(--text-light);margin-top:2px}.list-item-right{font-size:12px;color:var(--text-light);text-align:right;white-space:nowrap}.chat-page{display:flex;flex-direction:column;height:calc(100vh - var(--tab-height) - var(--header-height) - env(safe-area-inset-top,0px))}.chat-msgs{flex:1;overflow-y:auto;padding:12px 16px;display:flex;flex-direction:column;gap:10px}.chat-bubble{max-width:85%;padding:10px 14px;border-radius:14px;font-size:14px;line-height:1.6;word-break:break-word}.chat-ai{align-self:flex-start}.chat-ai .chat-bubble{background:var(--bg-card);border-bottom-left-radius:4px;box-shadow:var(--shadow)}.chat-user{align-self:flex-end}.chat-user .chat-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.chat-avatar-sm{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0}.chat-input-bar{display:flex;gap:8px;padding:10px 12px;background:var(--bg-card);border-top:1px solid var(--border);align-items:flex-end}.chat-input{flex:1;border:none;background:var(--bg);border-radius:20px;padding:10px 16px;font-size:14px;font-family:inherit;outline:none;min-height:40px;max-height:100px;resize:none}.chat-input:focus{background:#eef2ff}.chat-tools{display:flex;gap:4px}.chat-tools .icon-btn{width:40px;height:40px;font-size:20px;background:transparent}.zone-card{margin:0 12px 12px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}.zone-header{padding:14px 16px;color:#fff;display:flex;align-items:center;justify-content:space-between}.zone-name{font-size:15px;font-weight:700}.zone-sub{font-size:12px;opacity:.85}.zone-body{background:var(--bg-card);padding:12px 16px;display:flex;gap:8px;overflow-x:auto}.zone-node{display:flex;flex-direction:column;align-items:center;gap:4px;min-width:56px;cursor:pointer}.node-icon{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;border:2px solid var(--border);background:var(--bg)}.node-icon.done{background:var(--success);border-color:var(--success);color:#fff}.node-icon.active{background:var(--primary);border-color:var(--primary);color:#fff}.node-icon.locked{opacity:.4}.node-label{font-size:10px;color:var(--text-light);text-align:center}.node-line{width:20px;height:2px;background:var(--border);align-self:center}.q-card{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);margin:0 12px 12px;padding:20px}.q-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.q-num{font-weight:700;color:var(--primary);font-size:13px}.q-text{font-size:16px;line-height:1.8;margin-bottom:16px}.q-opts{display:flex;flex-direction:column;gap:8px}.q-opt{display:flex;align-items:center;gap:10px;padding:12px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:all .2s;font-size:14px}.q-opt:active{transform:scale(.98)}.q-opt.selected{border-color:var(--primary);background:#4f46e50d}.q-opt.correct{border-color:var(--success);background:#10b9810d}.q-opt.wrong{border-color:var(--danger);background:#ef44440d}.q-opt-dot{width:20px;height:20px;border:2px solid var(--border);border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center}.q-opt.selected .q-opt-dot{border-color:var(--primary)}.q-opt.selected .q-opt-dot:after{content:"";width:10px;height:10px;background:var(--primary);border-radius:50%}.q-hint{margin-top:12px;padding:12px;background:#4f46e50a;border-radius:var(--radius-sm);border-left:3px solid var(--primary-light);font-size:13px;color:var(--text-muted);display:none}.post{padding:14px 0;border-bottom:1px solid var(--border)}.post:last-child{border-bottom:none}.post-actions{display:flex;gap:24px;margin-top:10px;font-size:13px;color:var(--text-muted)}.post-action{display:flex;align-items:center;gap:4px;cursor:pointer}.achievement-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:0 12px}.ach-item{text-align:center;padding:16px 8px;background:var(--bg-card);border-radius:var(--radius-sm);box-shadow:var(--shadow)}.ach-icon{font-size:28px;margin-bottom:6px}.ach-name{font-size:12px;font-weight:600}.ach-desc{font-size:10px;color:var(--text-light);margin-top:2px}.auth-page{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 24px;background:linear-gradient(135deg,#4f46e5,#06b6d4)}.auth-card{width:100%;max-width:360px;background:var(--bg-card);border-radius:24px;padding:32px 24px;box-shadow:var(--shadow-lg)}.auth-logo{width:56px;height:56px;background:var(--primary);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700;color:#fff;margin:0 auto 16px}.auth-title{text-align:center;font-size:22px;font-weight:700;margin-bottom:4px}.auth-sub{text-align:center;font-size:14px;color:var(--text-light);margin-bottom:24px}.fg{margin-bottom:14px}.fl{display:block;font-size:13px;font-weight:600;margin-bottom:6px}.fi,.fs,.fta{width:100%;padding:12px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:15px;font-family:inherit;background:#fff;outline:none;transition:border-color .2s}.fi:focus,.fs:focus,.fta:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51a}.fta{min-height:80px;resize:vertical}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:200;display:flex;align-items:flex-end;animation:fadeIn .2s}.modal-sheet{width:100%;max-height:80vh;background:var(--bg-card);border-radius:20px 20px 0 0;padding:20px;animation:slideUp .3s ease;overflow-y:auto}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(40px);opacity:0}to{transform:translateY(0);opacity:1}}.empty-state{text-align:center;padding:40px 20px;color:var(--text-light)}.empty-icon{font-size:56px;margin-bottom:12px;opacity:.5}.toast{position:fixed;bottom:calc(var(--tab-height) + 16px);left:50%;transform:translate(-50%);background:var(--text);color:#fff;padding:10px 20px;border-radius:12px;font-size:13px;z-index:999;white-space:nowrap;animation:toastIn .3s ease;box-shadow:var(--shadow-lg);max-width:90vw}@keyframes toastIn{0%{transform:translate(-50%) translateY(20px);opacity:0}to{transform:translate(-50%) translateY(0);opacity:1}}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}.mt-2{margin-top:8px}.mt-3{margin-top:12px}.mt-4{margin-top:16px}.mb-2{margin-bottom:8px}.mb-4{margin-bottom:16px}.text-center{text-align:center}.text-sm{font-size:13px}.text-xs{font-size:11px}.text-lg{font-size:18px}.text-muted{color:var(--text-muted)}.font-bold{font-weight:700}.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}::-webkit-scrollbar{width:0;height:0}.star-rating{display:flex;gap:4px}.star{font-size:20px;opacity:.2}.star.active{opacity:1}.pulse{animation:pulse 2s infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.shake{animation:shake .5s}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}.action-circle{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff}.course-card{min-width:200px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);flex-shrink:0;cursor:pointer}.course-cover{height:90px;display:flex;align-items:center;justify-content:center;font-size:36px;color:#fff}.course-info{padding:10px 12px;background:var(--bg-card)}.course-name{font-weight:600;font-size:13px}.course-meta{font-size:11px;color:var(--text-light);margin-top:2px}.mode-tab{flex:1;padding:10px;background:var(--bg-card);border-radius:var(--radius-sm);box-shadow:var(--shadow);text-align:center;cursor:pointer}.mode-tab.active{border:2px solid var(--primary)}.mode-tab.active div:last-child{color:var(--primary)}.report-tab{flex:1;padding:10px;text-align:center;font-size:13px;font-weight:600;cursor:pointer}.report-tab.active{background:var(--primary);color:#fff}.room-card{min-width:140px;padding:16px;background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);text-align:center;cursor:pointer}.q-dot{width:10px;height:10px;border-radius:50%;background:var(--border)}.q-dot.active{background:var(--primary)}.q-dot.done{background:var(--success)}.course-hero{height:160px;display:flex;align-items:center;justify-content:center;flex-direction:column;color:#fff}