:root{--color-primary:#165DFF;--color-secondary:#6c757d;--color-success:#28a745;--color-danger:#dc3545;--color-bg:#f8f9fa;--radius:8px}
body{background:#fff;color:#212529}
.container{max-width:1400px}
.navbar-brand{font-weight:600}
.card{border-radius:var(--radius);box-shadow:0 2px 8px rgba(0,0,0,.06);margin-bottom:1.5rem}
.btn{border-radius:6px}
.footer{background:#212529;color:#fff}
.login-card,.register-card,.pay-card,.contact-card{max-width:640px;margin:50px auto}
.permission-alert{padding:.8rem;margin-bottom:1rem;border-radius:6px}
.video-item{border-bottom:1px solid #eee;padding:1rem 0;cursor:pointer}
.video-item:last-child{border-bottom:none}
.video-item.active{background-color:#f5fafe;border-left:3px solid var(--color-primary);padding-left:.5rem}
.trial-btn{color:#FF7D00;background:transparent;border:1px solid #FF7D00;border-radius:4px;padding:.3rem .8rem;text-decoration:none;transition:all .2s;cursor:pointer}
.trial-btn:hover{color:#fff;background:#FF7D00}
.activate-btn{background:var(--color-primary);color:#fff;border:none;width:100%;padding:1rem;font-size:1.1rem;border-radius:0 0 4px;cursor:pointer}
.activate-btn:hover{background:#0F4CD0}
.category-select-form{margin-bottom:1.5rem}
.category-select-container{background-color:var(--color-primary);color:#fff;padding:.8rem 1.2rem;border-radius:6px;display:flex;align-items:center;justify-content:space-between;cursor:pointer;position:relative}
.category-episode-text{font-size:1rem;font-weight:500}
.category-select{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer}
.category-select-arrow{font-size:1.2rem}
.home-carousel img{border-radius:8px}
.home-banner{padding:.5rem 0}
.banner-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.75rem}
.banner-item{display:flex;flex-direction:column;align-items:center;justify-content:center;background:#f5f8ff;border:1px solid #dbe4ff;border-radius:8px;padding:.6rem;color:#165DFF;text-decoration:none}
.banner-item i{font-size:1.2rem;margin-bottom:.2rem}
.banner-item span{font-size:.95rem;line-height:1.2}
.course-list-item{padding:1rem;border-bottom:1px solid #eee;cursor:pointer}
.course-list-item:last-child{border-bottom:none}
.course-thumb{width:140px;height:84px;object-fit:cover;border-radius:6px;margin-right:1rem;background:#f0f0f0}
.course-meta{font-size:.9rem;color:#6c757d}
.course-detail-card{border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.1);overflow:hidden;margin-bottom:1.5rem}
.course-detail-header{padding:1.2rem 1.5rem;background-color:#f8f9fa;border-bottom:1px solid #eee}
.course-detail-title{font-size:1.4rem;font-weight:600;margin:0}
.course-detail-content{padding:1.5rem;line-height:1.8;color:#333;white-space:pre-line}
.detail-empty{color:#999;text-align:center;padding:2rem 0}
.permission-tag{display:inline-block;margin:.2rem;padding:.2rem .5rem;background:#e9ecef;border-radius:4px}
.modal-body{max-height:70vh;overflow-y:auto}
.toast-container{position:fixed;top:20px;left:50%;transform:translateX(-50%);z-index:1080}
.table th{white-space:nowrap}
.table td{vertical-align:middle}
.action-group{display:flex;gap:.5rem;flex-wrap:nowrap}
.action-group .btn{display:inline-flex;align-items:center;gap:.25rem;white-space:nowrap}
.action-group .btn .bi{display:inline-block;font-size:1rem;line-height:1;margin-right:.25rem}
.action-group .btn{min-width:84px;justify-content:center}
.tag{display:inline-block;border-radius:999px;padding:.2rem .6rem;line-height:1;border:1px solid #e5e7eb;background:#f9fafb;font-size:.875rem;white-space:nowrap}
.tag.blue{color:#165DFF;border-color:#dbe4ff;background:#f5f8ff}
.date{white-space:nowrap;font-variant-numeric:tabular-nums;font-size:.9rem}
@media (max-width: 576px){
  .table-mobile thead{display:none}
  .table-mobile,.table-mobile tbody,.table-mobile tr,.table-mobile td{display:block;width:100%}
  .table-mobile tr{margin-bottom:.75rem;border:1px solid #eee;border-radius:6px;padding:.5rem .75rem;background:#fff}
  .table-mobile td{border:none;padding:.25rem 0;display:flex;align-items:baseline;gap:.5rem;word-break:break-all}
  .table-mobile td::before{content:attr(data-label);flex:0 0 90px;color:#6c757d;font-size:.875rem}
  .table-mobile .btn{margin-top:.25rem}
  .table-mobile .badge{font-size:.75rem}
  .table-mobile .btn-sm{padding:.25rem .5rem;font-size:.8rem;line-height:1.2}
  .table-mobile td[data-label="交易号"]{white-space:nowrap}
  .table-mobile .action-group{flex-wrap:wrap}
  .banner-grid{grid-template-columns:repeat(4,1fr)}
  .course-thumb{width:110px;height:68px;margin-right:.75rem}
  .banner-item i{font-size:1.1rem}
  .banner-item span{font-size:.85rem}
}