*{box-sizing:border-box}html,body,#modalRoot{height:100%}body{margin:0;font-family:Inter,system-ui,Arial,sans-serif;background:#f4f7fb;color:#0b1220}

.app{display:flex;min-height:100vh}
.sidebar{width:260px;background:#042b42;color:#eaf6ff;padding:20px;display:flex;flex-direction:column;gap:16px;border-right:1px solid rgba(2,6,23,0.06)}
.brand{display:flex;gap:12px;align-items:center}
.logo{width:48px;height:48px;border-radius:10px;background:linear-gradient(135deg,#2bb7ff,#1457ff);display:flex;align-items:center;justify-content:center;font-weight:700;color:white}
.brand-text .title{font-weight:800}
.brand-text .subtitle{font-size:13px;color:rgba(255,255,255,0.85)}
.nav{display:flex;flex-direction:column;gap:8px}
.nav-btn{background:transparent;border:0;padding:10px 12px;border-radius:8px;text-align:left;color:inherit;cursor:pointer;font-size:15px}
.nav-btn:hover{background:rgba(255,255,255,0.03)}
.nav-btn.active{background:rgba(255,255,255,0.04);font-weight:700}

.switcher{margin-top:auto}
.switcher label{font-size:13px;color:rgba(255,255,255,0.9)}
.switcher select{width:100%;padding:8px;border-radius:8px;margin-top:6px;border:1px solid rgba(2,12,27,0.08)}
.switch-actions{display:flex;gap:8px;margin-top:10px}
.switch-actions button{flex:1;padding:8px;border-radius:8px;border:0;background:white;color:#042b42;cursor:pointer}

.main{flex:1;padding:18px 22px;display:flex;flex-direction:column;gap:12px}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px}
.search-wrap{display:flex;align-items:center;gap:8px}
.search-wrap input{width:420px;padding:10px;border-radius:10px;border:1px solid #e6eef8}
.search-wrap select{padding:8px;border-radius:8px;border:1px solid #e6eef8}
.top-actions{display:flex;align-items:center;gap:10px}
.primary{background:#0b69ff;color:white;border:0;padding:8px 12px;border-radius:8px;cursor:pointer}
.danger{background:#ff5252;color:white;border:0;padding:8px 10px;border-radius:8px;cursor:pointer}

.panel{background:white;border-radius:12px;padding:16px;box-shadow:0 8px 30px rgba(2,12,27,0.06)}
.panel-head{display:flex;justify-content:space-between;align-items:center}
.muted{color:#64748b}
.small{font-size:13px}

.cards{display:flex;gap:12px;margin-top:12px}
.card.small{padding:12px;border-radius:10px;background:linear-gradient(180deg,#fff,#fbfdff);box-shadow:0 8px 18px rgba(2,12,27,0.04);flex:1}
.card-title{font-size:13px;color:#64748b}
.card-value{font-size:22px;font-weight:800;margin-top:6px}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin-top:12px}
.book-card{display:flex;gap:12px;padding:12px;border-radius:10px;border:1px solid #eef4ff;background:white;align-items:center}
.book-card .cover{width:80px;height:110px;border-radius:6px;overflow:hidden;background:#f1f5f9;display:flex;align-items:center;justify-content:center}
.book-card .cover img{width:100%;height:100%;object-fit:cover}
.book-card .info{flex:1}
.book-card .title{margin:0;font-size:16px}
.book-card .author{font-size:13px}
.tags{display:flex;gap:6px;margin-top:6px;flex-wrap:wrap}
.tag{background:#eef2ff;color:#0b69ff;padding:6px 8px;border-radius:999px;font-size:12px}

.card-actions{display:flex;flex-direction:column;gap:6px}
.btn{padding:6px 8px;border-radius:8px;border:1px solid rgba(2,12,27,0.06);background:transparent;cursor:pointer}
.btn.assign{background:#eef7ff}
.btn.edit{background:#fffbe6}
.btn.danger{background:#fff0f0;border-color:#ffd2d2;color:#ff3b3b}

.assign-layout{display:flex;gap:12px;margin-top:12px}
.assign-left{flex:1;display:flex;flex-direction:column;gap:12px}
.assign-right{flex:1;display:flex;flex-direction:column;gap:12px}
.preview .cover.large{width:100%;height:260px;border-radius:8px;background:#f1f5f9;display:flex;align-items:center;justify-content:center}
.preview .cover.large img{max-width:100%;max-height:100%;object-fit:cover}
.upload-area{padding:16px;border:2px dashed #e6eef8;border-radius:8px;text-align:center;cursor:pointer}
.linkish{color:#0b69ff;cursor:pointer;text-decoration:underline}
.gallery-head{display:flex;justify-content:space-between;align-items:center}

.image-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px;margin-top:8px}
.thumb{width:100%;height:90px;border-radius:6px;overflow:hidden;cursor:pointer;border:2px solid transparent}
.thumb.selected{outline:3px solid #0b69ff}
.thumb img{width:100%;height:100%;object-fit:cover}

.footer{font-family:Inter,system-ui,Arial,sans-serif}
.footer-top{background:#003768;color:#fff}
.footer-container{max-width:1100px;margin:0 auto;padding:18px 20px;display:flex;gap:16px;align-items:flex-start}
.footer-logo img{width:95px;height:auto;display:block}
.footer-info{flex:1;line-height:1.4}
.cus-ttcedu-footer{margin-bottom:6px;font-size:14px}
.cus-ttcedu-footer.strong{font-weight:700;font-size:15px}
.footer-bottom{width:100%;background:#0A314F;color:#fff;font-size:12px;font-weight:700;padding:12px 0}
.footer-bottom-inner{max-width:1100px;margin:0 auto;padding:0 20px;display:flex;align-items:center}
.footer .copyright{flex:1}

.modal-backdrop{position:fixed;inset:0;background:rgba(2,6,23,0.45);display:grid;place-items:center;z-index:60}
.modal{background:white;padding:16px;border-radius:12px;width:720px;max-width:95%}

.school-title-wrap{
  max-width:980px;
  margin:12px auto;
  padding:14px 18px;
  border-radius:10px;
  background: linear-gradient(90deg,#033b57,#045b7a);
  color:#eaf6ff;
  box-shadow:0 8px 24px rgba(2,12,27,0.12);
  text-align:center;
}
.school-title-wrap h1{
  margin:0;
  font-size:26px; 
  font-weight:800;
  letter-spacing:0.2px;
}

@media (max-width:900px){
  .sidebar{width:72px;padding:12px}
  .brand-text{display:none}
  .search-wrap input{width:160px}
  .assign-layout{flex-direction:column}
}
@media (max-width:720px){
  .footer-container{flex-direction:column;align-items:flex-start}
  .footer-logo{margin-bottom:12px}
  .footer-info{padding-left:0}
  .footer-bottom-inner{flex-direction:column;align-items:flex-start}
  .footer .copyright{margin-top:12px;text-align:center}
}