.app{min-height:100vh;display:flex;flex-direction:column;background-color:#f5f7fa;color:#303133;transition:all .3s ease;opacity:0;transform:translateY(20px);animation:fadeInUp .6s ease forwards}.app.loaded{opacity:1;transform:translateY(0)}@keyframes fadeInUp{to{opacity:1;transform:translateY(0)}}body.dark-theme .app{background-color:rgba(30,30,30,.8);color:#f0f0f0}.main-content{flex:1;color:#303133;transition:all .3s ease}body.dark-theme .main-content{color:#f5f5f5}.container{width:100%;max-width:1800px;margin:0 auto;padding:0 20px;box-sizing:border-box}.page-title{text-align:center;font-size:32px;margin-bottom:10px;margin-top:15px;color:#303133;transition:all .3s ease;opacity:0;transform:translateY(20px);animation:fadeInUp .6s ease .2s forwards;max-width:1400px;margin-left:auto;margin-right:auto;line-height:1.2}body.dark-theme .page-title{color:#fff;text-shadow:0 2px 4px rgba(0,0,0,.3)}.page-description{text-align:center;font-size:16px;color:#606266;transition:all .3s ease;opacity:0;transform:translateY(20px);animation:fadeInUp .6s ease .3s forwards;max-width:900px;margin:0 auto 30px;line-height:1.6}body.dark-theme .page-description{color:#b0b0b0}.core-intro{margin:40px auto;padding:25px 30px;background-color:rgba(64,158,255,.05);border-radius:12px;border:1px solid rgba(64,158,255,.2);max-width:1200px;opacity:0;transform:translateY(20px);animation:fadeInUp .6s ease .9s forwards}.core-intro p{font-size:14px;color:#606266;line-height:1.8;text-align:center;margin:0}body.dark-theme .core-intro{background-color:rgba(64,158,255,.1);border-color:rgba(64,158,255,.3)}body.dark-theme .core-intro p{color:#e0e0e0}.video-tools-section{margin:40px 0;padding:0 20px}.section-title{text-align:center;font-size:28px;margin-bottom:30px;color:#303133;transition:all .3s ease;opacity:0;transform:translateY(20px);animation:fadeInUp .6s ease .5s forwards}body.dark-theme .section-title{color:#fff;text-shadow:0 2px 4px rgba(0,0,0,.3)}.video-tools-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:1600px;margin:0 auto;width:100%}.video-tool-card{background-color:#fff;border-radius:12px;padding:25px 20px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.1),0 1px 3px rgba(0,0,0,.08);transition:all .4s cubic-bezier(.4,0,.2,1);border:1px solid #e4e7ed;position:relative;overflow:hidden;opacity:1;cursor:pointer;text-decoration:none;color:inherit;display:block}.video-tool-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,#409eff,#67c23a);transform:scaleX(0);transition:transform .4s ease}.video-tool-card:hover:before{transform:scaleX(1)}body.dark-theme .video-tool-card{background-color:rgba(35,35,45,.95);backdrop-filter:blur(15px);box-shadow:0 4px 20px rgba(0,0,0,.4),0 1px 3px rgba(0,0,0,.3);border:1px solid hsla(0,0%,100%,.12);color:#f5f5f5}.video-tool-card:hover{transform:translateY(-10px) scale(1.02);background-color:#f0f8ff}.video-tool-card:hover,body.dark-theme .video-tool-card:hover{box-shadow:0 12px 30px rgba(64,158,255,.3),0 4px 10px rgba(64,158,255,.1);border-color:rgba(64,158,255,.4)}body.dark-theme .video-tool-card:hover{background-color:rgba(40,40,60,.95)}.video-tool-icon{font-size:36px;color:#409eff;margin-bottom:15px;transition:all .4s cubic-bezier(.4,0,.2,1);display:flex;align-items:center;justify-content:center;width:70px;height:70px;margin-left:auto;margin-right:auto;background-color:rgba(64,158,255,.1);border-radius:14px;position:relative;z-index:1}body.dark-theme .video-tool-icon{background-color:rgba(64,158,255,.15)}.video-tool-card:hover .video-tool-icon{transform:scale(1.2) rotate(5deg);color:#67c23a;background-color:rgba(103,194,58,.1);box-shadow:0 8px 20px rgba(103,194,58,.2)}body.dark-theme .video-tool-card:hover .video-tool-icon{background-color:rgba(103,194,58,.15);box-shadow:0 8px 20px rgba(103,194,58,.2)}.video-tool-name{font-size:18px;margin-bottom:10px;color:#409eff;font-weight:600;transition:all .4s ease;position:relative;z-index:1}body.dark-theme .video-tool-name{color:#409eff}.video-tool-card:hover .video-tool-name{color:#67c23a;transform:translateY(-2px)}.video-tool-description{font-size:13px;color:#606266;line-height:1.6;transition:all .4s ease;margin:0;position:relative;z-index:1}body.dark-theme .video-tool-description{color:#a0a0a0}.video-tool-card:hover .video-tool-description{color:#303133;transform:translateY(-1px)}body.dark-theme .video-tool-card:hover .video-tool-description{color:#fff}@media (max-width:1200px){.video-tools-grid{grid-template-columns:repeat(3,1fr);gap:18px}.video-tool-card{padding:20px 15px}.video-tool-icon{font-size:32px;width:65px;height:65px}.video-tool-name{font-size:16px}.video-tool-description{font-size:12px}.core-intro{margin:30px 20px;padding:20px 25px}}@media (max-width:992px){.video-tools-grid{grid-template-columns:repeat(2,1fr);gap:16px}.section-title{font-size:24px}.page-title{font-size:28px}.core-intro p{font-size:13px}}@media (max-width:768px){.video-tools-section{margin:30px 0;padding:0 15px}.video-tools-grid{grid-template-columns:1fr;gap:14px}.video-tool-card{padding:20px 15px}.video-tool-icon{font-size:30px;width:60px;height:60px}.video-tool-name{font-size:15px}.video-tool-description{font-size:11px}.page-title{font-size:24px}.page-description{font-size:16px}.core-intro{margin:25px 15px;padding:18px 20px}.core-intro p{font-size:12px}}@media (max-width:480px){.section-title{font-size:20px}.video-tool-card{padding:15px 10px}.video-tool-icon{font-size:28px;width:55px;height:55px}.video-tool-name{font-size:14px}.video-tool-description{font-size:10px}.page-title{font-size:20px}.page-description{font-size:14px}.core-intro{margin:20px 10px;padding:15px 18px}.core-intro p{font-size:11px;line-height:1.7}}