.login-container{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#ecfdf5,#f0fdf4,#f9fafb,#f3f4f6,#e5e7eb);background-size:400% 400%;animation:gradientShift 15s ease infinite;padding:var(--space-lg);position:relative;overflow:hidden}.login-container:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(52,211,153,.08) 0%,transparent 50%);animation:rotate 20s linear infinite}.login-container:after{content:"";position:absolute;bottom:-30%;right:-30%;width:150%;height:150%;background:radial-gradient(circle,rgba(96,165,250,.06) 0%,transparent 50%);animation:rotate 25s linear infinite reverse}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}@keyframes 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var(--space-lg);font-size:var(--font-size-base);font-weight:var(--font-weight-medium);color:var(--text-secondary);transition:all var(--transition-base)}.login-card .ant-tabs-tab:hover{color:var(--primary-color)}.login-card .ant-tabs-tab-active{color:var(--primary-color);font-weight:var(--font-weight-semibold)}.login-card .ant-tabs-ink-bar{background:var(--gradient-primary);height:3px;border-radius:var(--radius-full)}.login-card .ant-form-item{margin-bottom:var(--space-lg)}.login-card .ant-form-item-label>label{color:var(--text-primary);font-weight:var(--font-weight-medium);font-size:var(--font-size-sm)}.login-card .ant-input,.login-card .ant-input-password{border-radius:var(--radius-md);border:1px solid var(--border-color);font-size:var(--font-size-base);padding:var(--space-md) var(--space-lg);transition:all var(--transition-base);background:var(--bg-secondary)}.login-card .ant-input:hover,.login-card .ant-input-password:hover{border-color:var(--primary-light);background:var(--bg-primary)}.login-card .ant-input:focus,.login-card .ant-input-password:focus,.login-card .ant-input-focused,.login-card .ant-input-password-focused{border-color:var(--primary-color);box-shadow:0 0 0 3px var(--primary-soft);background:var(--bg-primary)}.login-card .ant-input-prefix,.login-card .ant-input-suffix{color:var(--text-tertiary)}.login-card .ant-input:focus .ant-input-prefix,.login-card .ant-input-password:focus .ant-input-prefix{color:var(--primary-color)}.login-button{height:48px;font-size:var(--font-size-base);border-radius:var(--radius-md);font-weight:var(--font-weight-semibold);transition:all var(--transition-base);background:var(--gradient-primary);border:none;box-shadow:0 4px 12px #34d3994d;margin-top:var(--space-sm)}.login-button:hover{transform:translateY(-3px);box-shadow:0 6px 20px #34d39966;background:var(--primary-dark)}.login-button:active{transform:translateY(-1px);box-shadow:0 2px 8px #34d3994d}.login-button:disabled{background:var(--text-disabled);box-shadow:none;transform:none}.login-hint{display:block;text-align:center;margin-top:var(--space-lg);color:var(--text-secondary);font-size:var(--font-size-sm);line-height:1.6;padding:var(--space-md);background:var(--gradient-soft);border-radius:var(--radius-md);border:1px solid rgba(52,211,153,.2)}@media (max-width: 768px){.login-container{padding:var(--space-md)}.login-card{max-width:100%;padding:var(--space-xl);border-radius:var(--radius-lg)}.login-title{font-size:var(--font-size-xl);margin-bottom:var(--space-md)}.login-button{height:44px}}@media (max-width: 480px){.login-container{padding:var(--space-sm)}.login-card{padding:var(--space-lg);border-radius:var(--radius-md)}.login-title{font-size:var(--font-size-lg);margin-bottom:var(--space-md)}.login-card .ant-tabs-tab,.login-card .ant-input,.login-card .ant-input-password{padding:var(--space-sm) var(--space-md);font-size:var(--font-size-sm)}.login-button{height:42px;font-size:var(--font-size-sm)}.login-hint{font-size:var(--font-size-xs);padding:var(--space-sm)}}.main-layout{min-height:100vh;display:flex;flex-direction:column;background:transparent}.main-header{display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-lg);background:#fffffff2;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);box-shadow:var(--shadow-sm);z-index:var(--z-sticky);height:64px;border-bottom:1px solid var(--border-light);position:sticky;top:0;transition:all var(--transition-base)}.main-header:hover{box-shadow:var(--shadow-md)}.header-center{flex:1;display:flex;justify-content:center}.header-right{display:flex;align-items:center;gap:var(--space-md)}.user-info{display:flex;align-items:center;padding:var(--space-sm) var(--space-md);background:var(--bg-secondary);border-radius:var(--radius-full);transition:all var(--transition-base);cursor:pointer}.user-info:hover{background:var(--bg-tertiary);transform:translateY(-1px)}.user-avatar{margin-right:var(--space-sm);color:var(--primary-color);background:var(--gradient-soft);border:2px solid var(--primary-light);transition:all var(--transition-base)}.user-info:hover .user-avatar{border-color:var(--primary-color);transform:scale(1.05)}.user-name{color:var(--text-primary);font-weight:var(--font-weight-medium);font-size:var(--font-size-sm)}.main-sider{display:none}.main-content{padding:var(--space-lg);min-height:280px;background:transparent;margin:var(--space-md);border-radius:var(--radius-lg);flex:1;animation:fadeIn .4s ease-out}.top-menu{background-color:transparent;border-bottom:none;display:flex;justify-content:center;min-width:0}.top-menu .ant-menu-item{color:var(--text-secondary);margin:0 var(--space-xs);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);transition:all var(--transition-base);font-size:var(--font-size-sm);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:var(--font-weight-medium);position:relative}.top-menu .ant-menu-item:before{content:"";position:absolute;bottom:0;left:50%;width:0;height:2px;background:var(--gradient-primary);transition:all var(--transition-base);transform:translate(-50%);border-radius:var(--radius-full)}.top-menu .ant-menu-item:hover:before{width:60%}.top-menu .ant-menu-item:hover{color:var(--primary-color);background:var(--gradient-soft);transform:translateY(-2px)}.top-menu .ant-menu-item.ant-menu-item-selected{color:#fff;background:var(--gradient-primary);font-weight:var(--font-weight-semibold);box-shadow:0 4px 12px #34d3994d;transform:translateY(-2px)}.top-menu .ant-menu-item.ant-menu-item-selected:before{width:60%;background:#fff}.top-menu .ant-menu-item-icon{color:var(--text-secondary);font-size:var(--font-size-base);transition:all var(--transition-base)}.top-menu .ant-menu-item:hover .ant-menu-item-icon{color:var(--primary-color);transform:scale(1.1)}.top-menu .ant-menu-item.ant-menu-item-selected .ant-menu-item-icon{color:#fff;transform:scale(1.1)}.user-profile-menu{padding:var(--space-sm);min-width:200px}.user-profile-info{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-sm);border-bottom:1px solid var(--border-light);margin-bottom:var(--space-sm)}.user-profile-avatar{width:48px;height:48px;font-size:20px;color:var(--primary-color);background:var(--gradient-soft);border:2px solid var(--primary-light)}.user-profile-details{flex:1}.user-profile-name{font-size:var(--font-size-base);font-weight:var(--font-weight-semibold);color:var(--text-primary);margin-bottom:var(--space-xs)}.user-profile-username{font-size:var(--font-size-sm);color:var(--text-secondary)}.logout-menu-button{width:100%;justify-content:flex-start;margin-top:var(--space-xs)}@media (max-width: 768px){.main-header{padding:0 var(--space-md);height:56px}.header-title{font-size:var(--font-size-lg)}.user-info{padding:var(--space-xs) var(--space-sm)}.user-name{display:none}.main-content{padding:var(--space-md);margin:var(--space-sm)}.top-menu{gap:var(--space-xs)}.top-menu .ant-menu-item{padding:var(--space-xs) var(--space-sm);font-size:var(--font-size-xs);margin:0 2px;white-space:nowrap}.top-menu .ant-menu-item-icon{font-size:var(--font-size-sm)}}@media (max-width: 480px){.main-header{padding:0 var(--space-sm);height:52px}.top-menu{gap:var(--space-xs)}.top-menu .ant-menu-item{padding:var(--space-xs) var(--space-sm);font-size:11px}.top-menu .ant-menu-item-icon{font-size:13px}.user-avatar{width:28px;height:28px;font-size:12px}.user-profile-menu{min-width:180px}.user-profile-info{flex-direction:column;text-align:center;gap:var(--space-sm)}.user-profile-avatar{width:40px;height:40px;font-size:16px}.user-profile-name{font-size:var(--font-size-sm)}.user-profile-username{font-size:var(--font-size-xs)}}.lesson-page{padding:0;background:transparent;min-height:100vh}.page-title{margin-bottom:var(--space-lg);color:var(--text-primary);font-weight:var(--font-weight-bold);font-size:var(--font-size-xl);background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.lesson-selector-card{margin-bottom:var(--space-lg);border-radius:var(--radius-lg);box-shadow:var(--shadow-soft);border:1px solid var(--border-light);padding:var(--space-lg);background:var(--bg-primary);transition:all var(--transition-base)}.lesson-selector-card:hover{box-shadow:var(--shadow-md)}.volume-tabs{margin-bottom:16px}.volume-tabs .ant-tabs-tab{font-size:14px;padding:8px 20px;font-weight:500;color:#6b7280;border:1px solid transparent;border-bottom:none;border-radius:8px 8px 0 0;background:transparent;transition:all .3s ease;-webkit-transition:all .3s ease;-moz-transition:all .3s ease;-o-transition:all .3s ease}.volume-tabs .ant-tabs-tab:hover{color:#34d399;background:linear-gradient(135deg,#34d3991a,#34d3990d)}.volume-tabs .ant-tabs-tab-active{color:#34d399;background:#fff;border-color:#d1fae5;font-weight:600}.volume-tabs .ant-tabs-ink-bar{background:linear-gradient(90deg,#34d399,#10b981);height:3px;border-radius:9999px}.lesson-group-tabs{margin-bottom:16px}.lesson-group-tabs .ant-tabs-tab{font-size:12px;padding:4px 16px;color:#6b7280;border:1px solid transparent;border-bottom:none;border-radius:8px 8px 0 0;background:transparent;transition:all .3s ease;-webkit-transition:all .3s ease;-moz-transition:all .3s ease;-o-transition:all .3s ease}.lesson-group-tabs .ant-tabs-tab:hover{color:#34d399;background:linear-gradient(135deg,#34d3991a,#34d3990d)}.lesson-group-tabs .ant-tabs-tab-active{color:#34d399;background:#fff;border-color:#d1fae5;font-weight:500}.lesson-group-tabs .ant-tabs-ink-bar{background:linear-gradient(90deg,#34d399,#10b981);height:3px;border-radius:9999px}.lesson-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;padding:16px;background:#f9fafb;border:1px solid #e5e7eb;border-radius:12px}.lesson-item{padding:8px;background:#fff;border:1px solid #e5e7eb;border-radius:8px;cursor:pointer;transition:all .3s ease;-webkit-transition:all .3s ease;-moz-transition:all .3s ease;-o-transition:all .3s ease;text-align:center;box-shadow:0 1px 2px #0000000d;position:relative;overflow:hidden}.lesson-item:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,#34d399,#10b981);transform:scaleX(0);transition:transform .3s ease;-webkit-transition:transform .3s ease;-moz-transition:transform .3s ease;-o-transition:transform .3s ease}.lesson-item:hover{transform:translateY(-4px);box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f;border-color:#d1fae5}.lesson-item:hover:before{transform:scaleX(1)}.lesson-item.active{background:linear-gradient(135deg,#34d399,#10b981);border-color:#34d399;color:#fff;box-shadow:0 6px 20px #34d39966;transform:translateY(-4px)}.lesson-item.active:before{transform:scaleX(1);background:#fff}.lesson-number{font-size:14px;font-weight:700;margin-bottom:4px;color:inherit}.lesson-title{font-size:9px;line-height:1.2;color:inherit;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;height:24px;padding:0 2px;word-spacing:-1px;letter-spacing:-.5px}@media (max-width: 992px){.lesson-list{grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}}@media (max-width: 768px){.lesson-list{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:var(--space-sm);padding:var(--space-sm)}}@media (max-width: 480px){.lesson-list{grid-template-columns:repeat(2,1fr);gap:var(--space-sm);padding:var(--space-sm)}.volume-tabs .ant-tabs-tab,.lesson-group-tabs .ant-tabs-tab{padding:var(--space-xs) var(--space-md);font-size:var(--font-size-sm)}.lesson-item{padding:var(--space-sm)}.lesson-number{font-size:var(--font-size-base)}.lesson-title{font-size:var(--font-size-xs)}}.lesson-content-card{margin-bottom:var(--space-lg);border-radius:var(--radius-lg);box-shadow:var(--shadow-soft);border:1px solid var(--border-light);padding:var(--space-xl);background:var(--bg-primary);transition:all var(--transition-base)}.lesson-content-card:hover{box-shadow:var(--shadow-md)}.lesson-title{margin-bottom:var(--space-md);color:var(--text-primary);font-size:var(--font-size-xl);font-weight:var(--font-weight-bold)}.status-bar{display:flex;gap:var(--space-sm);justify-content:flex-end;margin-bottom:var(--space-md);padding-bottom:var(--space-md);border-bottom:1px solid var(--border-light)}.status-item{padding:var(--space-xs) var(--space-md);border-radius:var(--radius-md);font-size:var(--font-size-sm);color:var(--text-primary);border:1px solid var(--border-light);cursor:pointer;-webkit-user-select:none;-moz-user-select:none;user-select:none;transition:all var(--transition-base);background:var(--bg-secondary);font-weight:var(--font-weight-medium)}.status-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm);background:var(--bg-tertiary);border-color:var(--border-hover)}.sentence{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:var(--space-lg);margin:var(--space-sm) auto;cursor:pointer;transition:all var(--transition-base);position:relative;box-shadow:var(--shadow-xs);max-width:800px;width:100%}.sentence:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--primary-light)}.sentence.active{border:2px solid var(--primary-color);padding:calc(var(--space-lg) - 2px);background:var(--gradient-soft);box-shadow:0 4px 16px #34d39933}.sentence .en{display:block!important;font-weight:var(--font-weight-medium);font-size:var(--font-size-lg);color:var(--text-primary);margin-bottom:var(--space-sm);width:100%;line-height:1.6}.sentence .cn{display:block!important;font-size:var(--font-size-base);color:var(--text-secondary);margin-bottom:var(--space-sm);width:100%;line-height:1.6}.sentence-fav-btn{position:absolute;top:12px;right:12px;background:none;border:none;cursor:pointer;padding:6px;border-radius:50%;transition:all .2s ease;width:28px;height:28px;display:flex;align-items:center;justify-content:center;z-index:10;opacity:0;background:#00000080}.sentence:hover .sentence-fav-btn{opacity:1}.sentence-fav-btn:hover{background:#000c}.sentence-fav-btn.active svg path{fill:#10b981}.sentence-fav-btn svg{width:16px;height:16px;fill:var(--text-color-secondary);transition:all .2s ease}.reveal-btn{position:absolute;top:12px;left:12px;background:var(--accent);color:#fff;border-radius:6px;padding:6px 12px;font-size:13px;cursor:pointer;transition:all .2s ease;opacity:.9;z-index:100;box-shadow:0 2px 6px #00000026;font-weight:500}.sentence.revealed .reveal-btn{display:none!important;visibility:hidden!important}.reveal-btn:hover{opacity:1;transform:translateY(-1px);box-shadow:0 3px 8px #0003}.sentence:not(.revealed) .en,.sentence:not(.revealed) .cn{opacity:0;transition:opacity .2s ease}.lang-en .cn,.lang-cn .en{display:none!important}.lang-bi .en,.lang-bi 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0}.lesson-page{padding-bottom:130px}.recording-title{margin-bottom:var(--space-lg);color:var(--text-primary);font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold)}.recording-controls{display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap;align-items:center;padding:var(--space-sm)}.record-button{width:64px!important;height:64px!important;min-width:64px!important;font-size:var(--font-size-xl);border-radius:50%!important;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 16px #34d39966;transition:all var(--transition-base);background:var(--gradient-primary);border:none!important;padding:2px;color:#fff;overflow:hidden;flex-shrink:0}.record-button:hover{transform:scale(1.08);box-shadow:0 6px 20px #34d39980}.record-button:active{transform:scale(.95)}.stop-button{width:64px!important;height:64px!important;min-width:64px!important;font-size:var(--font-size-xs);border-radius:50%!important;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 4px 16px #f8717166;transition:all var(--transition-base);background:linear-gradient(135deg,#f87171,#f59e0b);border:none!important;padding:2px;color:#fff!important;overflow:visible;flex-shrink:0;position:relative;z-index:1;white-space:nowrap}.stop-button .ant-btn-content{display:flex!important;flex-direction:column!important;align-items:center!important;justify-content:center!important;color:#fff!important;opacity:1!important;visibility:visible!important}.stop-button .ant-btn-content span,.stop-button .ant-btn-content 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