.teacher-v2{--teacher-bg:#f5f7fa;--teacher-sidebar:#fff;--teacher-card:#fff;--teacher-raised:#f5f7fa;--teacher-border:#e5e6eb;--teacher-text:#1f2329;--teacher-muted:#646a73;--teacher-purple:#1677ff;--teacher-purple-end:#4d9aff;--teacher-success:#34c724;--teacher-warning:#ff8f1f;--teacher-danger:#f54a45;--background:#f5f7fa;--foreground:#1f2329;--card:#fff;--card-foreground:#1f2329;--popover:#fff;--popover-foreground:#1f2329;--primary:#1677ff;--primary-foreground:#fff;--secondary:#f5f7fa;--secondary-foreground:#1f2329;--muted:#f5f7fa;--muted-foreground:#646a73;--accent:#e8f3ff;--accent-foreground:#1677ff;--border:#e5e6eb;--input:#e5e6eb;--ring:#1677ff;color:#1f2329;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;background:#f5f7fa;min-height:100vh}.teacher-v2 a{color:inherit}.teacher-v2 .text-purple-600,.teacher-v2 .text-purple-700{color:#1677ff!important}.teacher-v2{font-family:var(--font-noto-sc),var(--font-geist-sans),"PingFang SC","Microsoft YaHei",sans-serif;background:#f5f7fa}.teacher-v2-sidebar{background:#fff;border-right:1px solid #e5e6eb;width:232px;padding:16px 12px 12px;transition:width .2s}.teacher-v2.is-collapsed .teacher-v2-sidebar{width:64px;padding:16px 8px 12px}.teacher-v2.is-collapsed .teacher-v2-brand strong,.teacher-v2.is-collapsed .teacher-v2-brand small,.teacher-v2.is-collapsed .teacher-v2-nav-label,.teacher-v2.is-collapsed .teacher-v2-nav-item>span,.teacher-v2.is-collapsed .teacher-v2-profile-card>span:not(.teacher-v2-avatar),.teacher-v2.is-collapsed .teacher-v2-sidebar-toggle>span,.teacher-v2.is-collapsed .teacher-v2-logout>span{display:none}.teacher-v2.is-collapsed .teacher-v2-nav-item,.teacher-v2.is-collapsed .teacher-v2-brand,.teacher-v2.is-collapsed .teacher-v2-logout,.teacher-v2.is-collapsed .teacher-v2-profile-card{justify-content:center}.teacher-v2.is-collapsed .teacher-v2-nav-item{padding:0}.teacher-v2.is-collapsed .teacher-v2-nav-search{display:none}.teacher-v2.is-collapsed .teacher-v2-logout{padding:0 10px;overflow:hidden}.teacher-v2-sidebar-toggle{color:#646a73;border-radius:8px;justify-content:center;align-items:center;gap:8px;width:100%;min-height:38px;font-size:13px;transition:background .15s,color .15s;display:flex}.teacher-v2-sidebar-toggle:hover{color:#1677ff;background:#f5f7fa}.teacher-v2-sidebar-toggle svg{flex:none;width:16px;height:16px}.teacher-v2-brand{min-height:52px;padding:2px 6px 10px}.teacher-v2-brand-mark{color:#fff;background:#1677ff;border-radius:9px;width:36px;height:36px;font-weight:800;box-shadow:0 2px 8px #1677ff4d}.teacher-v2-brand strong{color:#1f2329;font-size:15px;font-weight:700}.teacher-v2-brand small{color:#8f959e;letter-spacing:.06em;font-size:9px}.teacher-v2-nav-search{color:#8f959e;background:#f5f7fa;border:1px solid #e5e6eb;border-radius:8px;gap:8px;min-height:36px;margin:2px 2px 10px;padding:0 10px}.teacher-v2-nav-search input{color:#1f2329}.teacher-v2-nav-search input::placeholder{color:#8f959e}.teacher-v2-nav section+section{margin-top:18px}.teacher-v2-nav-label{color:#8f959e;margin:0 8px 6px;font-size:11px;font-weight:600}.teacher-v2-nav-list{gap:2px}.teacher-v2-nav-item{color:#41464f;border:1px solid #0000;border-radius:8px;min-height:40px;padding:0 10px;font-size:14px;font-weight:500}.teacher-v2-nav-item:hover{color:#1f2329;background:#f5f7fa}.teacher-v2-nav-item.is-active{color:#1677ff;box-shadow:none;background:#e8f3ff;border-color:#0000;font-weight:600}.teacher-v2-nav-item>svg{width:17px;height:17px}.teacher-v2-nav-empty{color:#8f959e}.teacher-v2-account{border-top:1px solid #e5e6eb}.teacher-v2-avatar,.teacher-v2-top-avatar{color:#fff;background:#1677ff;border:none;border-radius:50%}.teacher-v2-profile-card strong{color:#1f2329}.teacher-v2-profile-card small{color:#8f959e}.teacher-v2-logout{color:#646a73}.teacher-v2-logout:hover{color:#f54a45;background:#fef0ef}.teacher-v2-workspace{padding:12px}.teacher-v2-main-frame{background:#fff;border:1px solid #e5e6eb;border-radius:12px;min-height:calc(100vh - 24px);overflow:hidden;box-shadow:0 2px 8px #0000000d}.teacher-v2-frame-header{background:#fff;border-bottom:1px solid #e5e6eb;min-height:64px;padding:12px clamp(16px,2.2vw,28px);position:relative}.teacher-v2.is-compact .teacher-v2-frame-header{min-height:56px}.teacher-v2-frame-header h1{color:#1f2329;letter-spacing:0;font-size:18px;font-weight:700}.teacher-v2-frame-header p{color:#8f959e;font-size:12px}.teacher-v2-frame-actions{gap:10px}.teacher-v2-topbar-search{color:#8f959e;background:#f5f7fa;border:1px solid #e5e6eb;border-radius:18px;align-items:center;gap:8px;width:min(320px,30vw);min-height:36px;padding:0 14px;transition:border-color .15s,background .15s;display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.teacher-v2-topbar-search:focus-within{background:#fff;border-color:#1677ff}.teacher-v2-topbar-search input{color:#1f2329;background:0 0;border:0;outline:0;flex:1;min-width:0;font-size:13px}.teacher-v2-topbar-search input::placeholder{color:#8f959e}.teacher-v2-topbar-search button{color:#8f959e;place-items:center;display:grid}.teacher-v2-topbar-search button:hover{color:#1677ff}@media (max-width:1279px){.teacher-v2-topbar-search{display:none}}.teacher-v2-content{min-height:calc(100vh - 96px);padding:clamp(16px,2vw,24px)}.teacher-v2 .teacher-v3-metric-card,.teacher-v2 .teacher-v3-panel,.teacher-v2 .teacher-v3-chart{background:#fff;border:1px solid #e5e6eb;border-radius:10px;transition:box-shadow .18s,transform .18s;box-shadow:0 2px 8px #0000000a}.teacher-v2 .teacher-v3-panel:hover,.teacher-v2 .teacher-v3-chart:hover{box-shadow:0 4px 14px #00000012}.teacher-v2 .teacher-v3-panel-header h2,.teacher-v2 .teacher-v3-chart-header h2{color:#1f2329;font-weight:700}.teacher-v2 .teacher-v3-workspace{color:#1f2329;background:#fff}.teacher-v2 .teacher-v3-workspace h1{color:#1f2329}.teacher-v2 .teacher-v3-eyebrow,.teacher-v2 .teacher-v3-muted,.teacher-v2 .teacher-v3-panel-header p{color:#8f959e}.teacher-v2 .teacher-v3-metric-value{color:#1f2329;font-weight:700}.teacher-v2 .teacher-v3-back-link{color:#646a73}.teacher-v2 .teacher-v3-back-link:hover,.teacher-v2 .teacher-v3-empty-icon{color:#1677ff}.teacher-v2 .teacher-v3-empty-state h3{color:#1f2329}.teacher-v2 .teacher-v3-data-card{background:#fff;border:1px solid #e5e6eb;border-radius:10px;box-shadow:0 1px 4px #00000008}.teacher-v2 .teacher-v3-data-card strong{color:#1f2329}.teacher-v2 .teacher-v3-data-card small{color:#646a73}.teacher-v2 .teacher-v3-card-meta,.teacher-v2 .teacher-v3-audio-details{color:#8f959e}.teacher-v2 .teacher-v3-card-meta dd{color:#1f2329}.teacher-v2 .teacher-v3-trend,.teacher-v2 .teacher-v3-status{border-radius:6px;font-weight:600}.teacher-v2 .teacher-v3-trend.is-up,.teacher-v2 .teacher-v3-status.is-success,.teacher-v2 .teacher-v3-status.is-available{color:#1fa31a;background:#34c7241f}.teacher-v2 .teacher-v3-trend.is-down,.teacher-v2 .teacher-v3-status.is-error,.teacher-v2 .teacher-v3-status.is-expired,.teacher-v2 .teacher-v3-status.is-disabled{color:#e03e3a;background:#f54a451a}.teacher-v2 .teacher-v3-status.is-warning,.teacher-v2 .teacher-v3-status.is-expiring,.teacher-v2 .teacher-v3-status.is-used{color:#d97a10;background:#ff8f1f1f}.teacher-v2 .teacher-v3-trend.is-neutral,.teacher-v2 .teacher-v3-status.is-neutral{color:#646a73;background:#f5f7fa}.teacher-v2 .teacher-v3-primary-button{color:#fff;background:#1677ff;border-radius:8px;font-weight:600;transition:background .15s,box-shadow .15s,transform .15s;box-shadow:0 2px 6px #1677ff40}.teacher-v2 .teacher-v3-primary-button:hover{background:#3c8dff;transform:translateY(-1px)}.teacher-v2 .teacher-v3-primary-button:active{transform:translateY(0)}.teacher-v2 .teacher-v3-primary-button:disabled{box-shadow:none;background:#a8ccff}.teacher-v2 .teacher-v3-secondary-button,.teacher-v2 .teacher-v3-icon-button{color:#41464f;background:#fff;border:1px solid #d9dce1;border-radius:8px;transition:border-color .15s,color .15s,background .15s}.teacher-v2 .teacher-v3-secondary-button:hover,.teacher-v2 .teacher-v3-icon-button:hover{color:#1677ff;background:#f7fbff;border-color:#1677ff}.teacher-v2 .teacher-v3-icon-button.is-danger{color:#f54a45}.teacher-v2 .teacher-v3-icon-button.is-danger:hover{color:#f54a45;background:#fef0ef;border-color:#f54a45}.teacher-v2 .teacher-v3-secondary-button.is-danger{color:#f54a45;border-color:#f54a4566}.teacher-v2 .teacher-v3-secondary-button.is-danger:hover{background:#fef0ef;border-color:#f54a45}.teacher-v2 .bg-purple-600,.teacher-v2 .bg-purple-700{color:#fff!important;background:#1677ff!important}.teacher-v2 .bg-purple-600:hover,.teacher-v2 .bg-purple-700:hover{background:#3c8dff!important}.teacher-v2 .ring-purple-500,.teacher-v2 .focus\:ring-purple-500:focus{--tw-ring-color:#1677ff!important}.teacher-v2 input:not([type=checkbox]):not([type=radio]),.teacher-v2 textarea,.teacher-v2 select,.teacher-v2 [role=combobox]{border-radius:8px;color:#1f2329!important;background:#fff!important;border-color:#e5e6eb!important}.teacher-v2 input::placeholder,.teacher-v2 textarea::placeholder{color:#8f959e}.teacher-v2 input:focus,.teacher-v2 textarea:focus,.teacher-v2 select:focus{border-color:#1677ff!important}.teacher-v2 .teacher-v3-search{background:#fff;border:1px solid #e5e6eb;border-radius:8px}.teacher-v2 .teacher-v3-search input{color:#1f2329}.teacher-v2 .teacher-v3-filter-row select,.teacher-v2 .teacher-v3-upload-form input,.teacher-v2 .teacher-v3-upload-form select{color:#1f2329;background:#fff;border:1px solid #e5e6eb;border-radius:8px}.teacher-v2 .teacher-v3-filter-chips button{color:#646a73;background:#f5f7fa;border-radius:8px}.teacher-v2 .teacher-v3-filter-chips button:hover{color:#1677ff}.teacher-v2 .teacher-v3-filter-chips .is-active{color:#fff;background:#1677ff}.teacher-v2 .teacher-v3-file-input{border:1px dashed #1677ff;border-radius:8px;color:#1677ff!important}.teacher-v2 .teacher-v3-preference-row input{accent-color:#1677ff}.teacher-v2 .teacher-v3-segment.is-active{color:#fff;background:#1677ff}.teacher-v2 .teacher-v3-segmented{background:#f5f7fa;border-radius:8px}.teacher-v2 .teacher-v3-table th{color:#646a73;background:#f5f7fa;border-bottom:1px solid #e5e6eb}.teacher-v2 .teacher-v3-table th:first-child{border-radius:8px 0 0 8px}.teacher-v2 .teacher-v3-table th:last-child{border-radius:0 8px 8px 0}.teacher-v2 .teacher-v3-table td{color:#1f2329;border-bottom:1px solid #f0f1f3;padding:13px 11px}.teacher-v2 .teacher-v3-table tr:hover td{background:#f7f9fc}.teacher-v2 .teacher-v3-table-view th,.teacher-v2 .teacher-v3-table-view td{border-bottom:1px solid #f0f1f3}.teacher-v2 .teacher-v3-table-view th{color:#646a73;background:#f5f7fa}.teacher-v2 .teacher-v3-source-notice{color:#d93a35;background:#fef0ef;border:1px solid #f54a453d}.teacher-v2 .teacher-v3-featured-audio{background:#e8f3ff;border:1px solid #1677ff29}.teacher-v2 .teacher-v3-featured-audio span{color:#646a73}.teacher-v2 .teacher-v3-bottom-player{background:#fff;border:1px solid #e5e6eb;border-radius:10px;box-shadow:0 8px 24px #0000001a}.teacher-v2 .teacher-v3-ranking li{background:#f5f7fa;border-radius:8px}.teacher-v2 .teacher-v3-ranking li>strong{color:#fff;background:#1677ff}.teacher-v2 .teacher-v3-share-guide{color:#646a73;background:#f0f7ff;border:1px solid #1677ff40}.teacher-v2 .teacher-v3-share-guide strong{color:#1f2329}.teacher-v2 .teacher-v3-notification{color:#1f2329;background:#fff;border:1px solid #e5e6eb;border-radius:10px}.teacher-v2 .teacher-v3-notification.is-unread{background:#f0f7ff;border-color:#1677ff66}.teacher-v2 .teacher-v3-notification-icon{color:#1677ff;background:#e8f3ff}.teacher-v2 .teacher-v3-notification>i{background:#1677ff}.teacher-v2 .teacher-v3-profile-hero{background:#fff;border:1px solid #e5e6eb;border-radius:10px;box-shadow:0 2px 8px #0000000a}.teacher-v2 .teacher-v3-profile-hero h2{color:#1f2329}.teacher-v2 .teacher-v3-profile-avatar{background:#1677ff}.teacher-v2 .teacher-v3-profile-avatar span{color:#1f2329;background:#f5f7fa;border:1px solid #e5e6eb}.teacher-v2 .teacher-v3-workspace .teacher-v3-profile-grid{margin-top:0}.teacher-v2 main>header.sticky,.teacher-v2>div>header.sticky{-webkit-backdrop-filter:none;backdrop-filter:none;background:#fff!important;border-color:#e5e6eb!important}.teacher-demo-dialog-overlay{-webkit-backdrop-filter:none;backdrop-filter:none;background:#1f232973}.teacher-demo-dialog-content{color:#1f2329;background:#fff;border:1px solid #e5e6eb;border-radius:16px;padding:24px;box-shadow:0 20px 60px #0000002e}.teacher-demo-dialog-title{color:#1f2329;font-size:17px;font-weight:700}.teacher-demo-dialog-description,.teacher-demo-dialog-close{color:#8f959e}.teacher-demo-dialog-close:hover{color:#1f2329;background:#f5f7fa}.teacher-demo-reset-confirmation input{color:#1f2329;background:#fff;border:1px solid #e5e6eb;border-radius:8px}.teacher-demo-reset-confirmation{color:#646a73}.teacher-demo-dialog-content input,.teacher-demo-dialog-content textarea,.teacher-demo-dialog-content select{color:#1f2329;background:#fff;border:1px solid #e5e6eb;border-radius:8px}.teacher-demo-dialog-content input:focus,.teacher-demo-dialog-content textarea:focus,.teacher-demo-dialog-content select:focus{border-color:#1677ff;outline:none}.teacher-demo-dialog-content label{color:#41464f}.teacher-demo-dialog-content .dialog-kv{color:#1f2329}.teacher-demo-dialog-content .dialog-kv small{color:#8f959e}.teacher-demo-mode-badge{color:#1677ff;background:#e8f3ff;border:1px solid #1677ff59}.teacher-demo-mode-badge:hover{background:#d6ebff;border-color:#1677ff99}.teacher-demo-notification-button{color:#646a73;background:#fff;border:1px solid #e5e6eb;border-radius:50%}.teacher-demo-notification-button:hover{color:#1677ff;border-color:#1677ff}.teacher-demo-notification-button>span{color:#fff;background:#f54a45;border:2px solid #fff}.teacher-v2-immersive-back{color:#1f2329;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#fffffff0;border:1px solid #e5e6eb;border-radius:8px;box-shadow:0 2px 8px #00000014}.teacher-v2-mobile-nav{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#fffffffa;border:1px solid #e5e6eb;border-radius:14px;box-shadow:0 -4px 24px #00000014}.teacher-v2-mobile-nav a{color:#8f959e}.teacher-v2-mobile-nav a.is-active{color:#1677ff;background:0 0}.teacher-v2-mobile-nav a.is-active svg{color:#1677ff}.teacher-v2 .bg-white,.teacher-v2 .bg-white\/80,.teacher-v2 .bg-white\/90,.teacher-v2 .bg-gray-50,.teacher-v2 .bg-gray-50\/50,.teacher-v2 .bg-slate-50{background-color:#fff!important}.teacher-v2 .bg-gray-100,.teacher-v2 .bg-gray-200{background-color:#f5f7fa!important}.teacher-v2 .bg-purple-50,.teacher-v2 .bg-blue-50{background-color:#e8f3ff!important}.teacher-v2 .bg-amber-50{background-color:#fff4e8!important}.teacher-v2 .bg-green-50{background-color:#ebf9ea!important}.teacher-v2 .text-gray-900,.teacher-v2 .text-gray-800,.teacher-v2 .text-gray-700,.teacher-v2 .text-slate-900{color:#1f2329!important}.teacher-v2 .text-gray-600,.teacher-v2 .text-gray-500,.teacher-v2 .text-gray-400,.teacher-v2 .text-slate-600,.teacher-v2 .text-slate-500{color:#646a73!important}.teacher-v2 .border,.teacher-v2 .border-gray-100,.teacher-v2 .border-gray-200,.teacher-v2 .border-gray-300,.teacher-v2 .border-slate-200{border-color:#e5e6eb!important}.teacher-v2 .hover\:bg-gray-50:hover{background-color:#f5f7fa!important}.teacher-v2 .hover\:bg-gray-100:hover{background-color:#f0f1f3!important}.teacher-v2 [data-sonner-toast]{color:#1f2329}.teacher-v2 .text-slate-200,.teacher-v2 .text-slate-300{color:#41464f!important}.teacher-v2 .text-slate-400,.teacher-v2 .text-slate-500,.teacher-v2 .text-gray-300{color:#8f959e!important}.teacher-v2 .border-white\/10{border-color:#e5e6eb!important}.teacher-v2 .bg-white\/5,.teacher-v2 .bg-white\/\[0\.03\],.teacher-v2 .bg-white\/\[0\.03\]{background-color:#f5f7fa!important}.teacher-v2 .bg-slate-950{background-color:#fff!important}.teacher-v2 .text-rose-300{color:#d93a35!important}.teacher-v2 .text-amber-200,.teacher-v2 .text-amber-600,.teacher-v2 .text-amber-700{color:#d97a10!important}.teacher-v2 .text-red-600,.teacher-v2 .text-red-700{color:#e03e3a!important}.teacher-v2 .text-green-600,.teacher-v2 .text-green-700,.teacher-v2 .text-green-800{color:#1fa31a!important}.teacher-v2 .text-blue-600,.teacher-v2 .text-blue-700,.teacher-v2 .text-purple-700{color:#1677ff!important}.teacher-v2 .bg-violet-600{color:#fff!important;background-color:#1677ff!important}.teacher-v2 .border-violet-400{border-color:#1677ff!important}.teacher-v2 .hover\:border-violet-400\/60:hover,.teacher-v2 .hover\:border-violet-400:hover{border-color:#1677ff8c!important}.teacher-v2 .bg-purple-100,.teacher-v2 .bg-purple-50{background-color:#e8f3ff!important}.teacher-v2 .bg-amber-100{background-color:#fff4e8!important}.teacher-v2 .bg-amber-400\/10{background-color:#ff8f1f1a!important}.teacher-v2 .border-amber-400\/40{border-color:#ff8f1f66!important}.teacher-v2 .bg-red-50{background-color:#fef0ef!important}.teacher-v2 .bg-red-100{background-color:#fde5e4!important}.teacher-v2 .bg-red-400\/10{background-color:#f54a4514!important}.teacher-v2 .border-red-400\/40{border-color:#f54a4559!important}.teacher-v2 .text-amber-200,.teacher-v2 .text-amber-300{color:#d97a10!important}.teacher-v2 .bg-gray-200{background-color:#e5e6eb!important}.teacher-v2 .focus-visible\:ring-violet-400:focus-visible{--tw-ring-color:#1677ff!important}