:root{
  --brand:#4f7cff;
  --brand2:#8a5cf6;
  --bg:#f3f5fb;
  --card:#ffffff;
  --text:#20242e;
  --muted:#6b7280;
  --border:#e7eaf5;
  --radius:16px;
  --shadow:0 10px 30px rgba(90,110,180,.10);
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{font-family:'Segoe UI',Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}

/* ---------- Auth ---------- */
.auth-body{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#eef1f8,#f8f5ff);}
.auth-card{width:380px;max-width:92vw;background:rgba(255,255,255,.92);border-radius:22px;padding:36px 32px;box-shadow:var(--shadow);backdrop-filter:blur(8px);}
.auth-logo{font-size:22px;font-weight:800;display:flex;gap:8px;align-items:center;}
.auth-logo span{background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent;}
.auth-sub{color:var(--muted);margin-top:4px;margin-bottom:22px;font-size:14px;}
.auth-form label{display:block;font-size:13px;font-weight:600;color:#4b5563;margin:12px 0 6px;}
.auth-form input{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--border);font-size:14px;}
.auth-form input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,124,255,.15);}
.btn-primary{width:100%;margin-top:18px;padding:13px;border:none;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:700;font-size:15px;cursor:pointer;box-shadow:0 8px 20px rgba(79,124,255,.35);}
.btn-primary:hover{opacity:.93;}
.alert{padding:11px 14px;border-radius:10px;font-size:13px;margin-bottom:6px;}
.alert-error{background:#fff1f1;border:1px solid #ffd4d4;color:#b42323;}
.alert-success{background:#eefdf3;border:1px solid #b9f2cf;color:#0f7a3d;}

/* ---------- App shell ---------- */
.app{display:flex;min-height:100vh;}
.sidebar{width:240px;flex-shrink:0;background:var(--card);border-right:1px solid var(--border);padding:22px 16px;position:sticky;top:0;height:100vh;overflow-y:auto;}
.brand{font-weight:800;font-size:19px;display:flex;align-items:center;gap:8px;margin-bottom:26px;padding:0 6px;}
.brand span{background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent;}
.nav-item{display:flex;align-items:center;gap:10px;padding:11px 12px;border-radius:12px;color:#4b5563;font-size:14px;font-weight:600;margin-bottom:4px;cursor:pointer;}
.nav-item:hover{background:#f3f5fb;}
.nav-item.active{background:linear-gradient(135deg,rgba(79,124,255,.12),rgba(138,92,246,.12));color:var(--brand);}
.nav-icon{width:20px;text-align:center;}
.storage-box{margin-top:20px;padding:14px;border-radius:14px;background:#f7f8fd;border:1px solid var(--border);}
.storage-bar{height:7px;border-radius:6px;background:#e6e9f5;overflow:hidden;margin:8px 0;}
.storage-fill{height:100%;background:linear-gradient(135deg,var(--brand),var(--brand2));}
.storage-box small{color:var(--muted);}

.main{flex:1;min-width:0;}
.topbar{display:flex;align-items:center;gap:16px;padding:16px 26px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:5;}
.search-box{flex:1;max-width:460px;position:relative;}
.search-box input{width:100%;padding:11px 14px 11px 38px;border-radius:12px;border:1px solid var(--border);background:#f7f8fd;font-size:14px;}
.search-box::before{content:'🔍';position:absolute;left:13px;top:50%;transform:translateY(-50%);font-size:13px;opacity:.6;}
.user-chip{display:flex;align-items:center;gap:10px;margin-left:auto;}
.avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;}
.content{padding:26px;}
.breadcrumb{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-bottom:18px;font-size:14px;color:var(--muted);}
.breadcrumb a{color:var(--brand);font-weight:600;}
.toolbar{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px;}
.btn{padding:10px 16px;border-radius:11px;border:1px solid var(--border);background:#fff;font-size:13px;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;gap:6px;}
.btn:hover{background:#f7f8fd;}
.btn-grad{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border:none;box-shadow:0 8px 18px rgba(79,124,255,.28);}
.btn-danger{color:#c0392b;}

.dropzone{border:2px dashed var(--border);border-radius:var(--radius);padding:34px;text-align:center;color:var(--muted);margin-bottom:22px;transition:.15s;background:#fff;}
.dropzone.drag{border-color:var(--brand);background:rgba(79,124,255,.06);color:var(--brand);}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(168px,1fr));gap:16px;}
.item-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;cursor:pointer;position:relative;box-shadow:var(--shadow);transition:.15s;}
.item-card:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(90,110,180,.16);}
.item-icon{font-size:34px;margin-bottom:10px;}
.item-name{font-size:13.5px;font-weight:600;word-break:break-word;line-height:1.3;}
.item-meta{font-size:11px;color:var(--muted);margin-top:6px;}
.item-menu-btn{position:absolute;top:10px;right:10px;background:none;border:none;cursor:pointer;font-size:16px;color:var(--muted);padding:4px 8px;border-radius:8px;}
.item-menu-btn:hover{background:#f3f5fb;}
.item-fav{position:absolute;top:10px;left:10px;font-size:14px;}
.item-shared{position:absolute;top:10px;left:10px;font-size:13px;}
.item-list-cols{display:none;}
.item-select{position:absolute;top:8px;left:8px;width:18px;height:18px;opacity:0;transition:opacity .12s;z-index:2;}
.item-card:hover .item-select,.item-card.selected .item-select,.grid.select-mode .item-select{opacity:1;}
.item-checkbox{width:16px;height:16px;cursor:pointer;}
.item-card.selected{outline:2px solid var(--brand);background:rgba(79,124,255,.05);}
.item-thumb{padding:0;width:100%;height:64px;overflow:hidden;border-radius:10px;margin-bottom:10px;background:#f3f5fb;}
.item-thumb img{width:100%;height:100%;object-fit:cover;display:block;}
.grid.view-list .item-thumb{width:24px;height:24px;border-radius:6px;margin:0;}

/* ---------- Bulk action bar ---------- */
.bulk-bar{position:sticky;top:0;z-index:8;display:flex;align-items:center;justify-content:space-between;gap:12px;background:#20242e;color:#fff;padding:10px 18px;border-radius:12px;margin-bottom:14px;font-size:13px;font-weight:600;flex-wrap:wrap;}
.bulk-actions{display:flex;gap:8px;flex-wrap:wrap;}
.bulk-actions .btn{padding:7px 12px;font-size:12.5px;border:none;}
.bulk-actions .btn:not(.btn-grad):not(.btn-danger){background:#343a4a;color:#fff;}
.bulk-actions .btn-danger{background:#c0392b;color:#fff;}

/* ---------- Notifications ---------- */
.notif-dot{position:absolute;top:6px;right:6px;width:8px;height:8px;border-radius:50%;background:#e74c3c;}
.notif-dropdown{position:absolute;top:44px;right:0;width:320px;max-height:420px;overflow-y:auto;background:#fff;border:1px solid var(--border);border-radius:14px;box-shadow:0 14px 34px rgba(90,110,180,.22);z-index:50;}
.notif-dropdown-header{display:flex;justify-content:space-between;align-items:center;padding:12px 14px;border-bottom:1px solid var(--border);font-weight:700;font-size:13px;}
.notif-dropdown-header button{background:none;border:none;color:var(--brand);font-size:12px;font-weight:700;cursor:pointer;}
.notif-item{padding:10px 14px;border-bottom:1px solid var(--border);font-size:12.5px;line-height:1.4;}
.notif-item:last-child{border-bottom:none;}
.notif-item.unread{background:#f7f8ff;}
.notif-item .notif-time{color:var(--muted);font-size:11px;margin-top:3px;}
.notif-empty{padding:24px;text-align:center;color:var(--muted);font-size:12.5px;}

/* ---------- View toggle & list view ---------- */
.view-toggle{display:flex;gap:6px;margin-bottom:10px;}
.view-toggle-btn{padding:7px 14px;border-radius:9px;border:1px solid var(--border);background:#fff;font-size:12.5px;font-weight:700;cursor:pointer;color:var(--muted);}
.view-toggle-btn.active{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border-color:transparent;}
.list-header{display:none;align-items:center;gap:14px;padding:8px 16px;font-size:11.5px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.03em;}
.list-header .lh-icon{width:24px;flex-shrink:0;}
.list-header .lh-name{flex:1;}
.list-header .lh-type,.list-header .lh-size,.list-header .lh-date{width:110px;flex-shrink:0;}
.list-header .lh-spacer{width:32px;flex-shrink:0;}

.grid.view-list{display:flex;flex-direction:column;gap:6px;}
.grid.view-list .item-card{display:flex;align-items:center;gap:14px;padding:10px 16px;border-radius:10px;box-shadow:none;}
.grid.view-list .item-card:hover{transform:none;box-shadow:0 4px 14px rgba(90,110,180,.10);}
.grid.view-list .item-icon{font-size:20px;margin:0;flex-shrink:0;width:24px;text-align:center;order:2;}
.grid.view-list .item-name{flex:1;min-width:0;margin:0;font-size:13.5px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;order:3;}
.grid.view-list .item-meta{display:none;}
.grid.view-list .item-list-cols{display:flex;gap:0;flex-shrink:0;order:4;}
.grid.view-list .item-list-cols .col-type,.grid.view-list .item-list-cols .col-size,.grid.view-list .item-list-cols .col-date{width:110px;font-size:12px;color:var(--muted);}
.grid.view-list .item-fav,.grid.view-list .item-shared{position:static;flex-shrink:0;order:1;}
.grid.view-list .item-menu-btn{position:static;flex-shrink:0;order:5;width:32px;}
.grid.view-list .item-select{position:static;opacity:1;order:0;flex-shrink:0;}
.list-header .lh-check{width:18px;flex-shrink:0;}

/* ---------- Details modal ---------- */
.detail-row{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--border);font-size:13px;}
.detail-row:last-child{border-bottom:none;}
.detail-row .dt-label{color:var(--muted);}
.detail-row .dt-value{font-weight:600;text-align:right;}

.ctx-menu{position:fixed;background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:0 14px 34px rgba(90,110,180,.22);min-width:190px;max-height:80vh;overflow-y:auto;z-index:50;padding:6px;}
.ctx-menu button{display:flex;width:100%;text-align:left;padding:9px 12px;border:none;background:none;font-size:13.5px;border-radius:8px;cursor:pointer;gap:8px;}
.ctx-menu button:hover{background:#f3f5fb;}
.ctx-menu button.danger{color:#c0392b;}

.modal-overlay{position:fixed;inset:0;background:rgba(20,24,40,.42);display:flex;align-items:center;justify-content:center;z-index:100;padding:16px;}
.modal{background:#fff;border-radius:18px;padding:26px;width:380px;max-width:100%;box-shadow:0 20px 60px rgba(0,0,0,.25);}
.modal h3{margin-top:0;}
.modal input{width:100%;padding:11px 13px;border-radius:10px;border:1px solid var(--border);font-size:14px;margin:8px 0 16px;}
.modal-actions{display:flex;gap:10px;justify-content:flex-end;}

.empty-state{text-align:center;padding:60px 20px;color:var(--muted);}
.empty-state .em-icon{font-size:44px;margin-bottom:10px;}

.toast{position:fixed;bottom:22px;right:22px;background:#20242e;color:#fff;padding:12px 18px;border-radius:12px;font-size:13.5px;z-index:200;box-shadow:0 10px 30px rgba(0,0,0,.25);}
.toast.error{background:#c0392b;}
.toast.success{background:#0f7a3d;}

.progress-wrap{background:#eef0f8;border-radius:8px;height:8px;overflow:hidden;margin-top:6px;}
.progress-bar{height:100%;background:linear-gradient(135deg,var(--brand),var(--brand2));width:0%;transition:width .2s;}

table.admin-table{width:100%;border-collapse:collapse;background:#fff;border-radius:14px;overflow:hidden;box-shadow:var(--shadow);}
table.admin-table th, table.admin-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border);font-size:13.5px;}
table.admin-table th{background:#f7f8fd;color:var(--muted);font-weight:700;}
.badge{padding:3px 10px;border-radius:20px;font-size:11px;font-weight:700;}
.badge-admin{background:rgba(138,92,246,.14);color:#7c3aed;}
.badge-user{background:rgba(79,124,255,.14);color:#4f7cff;}
.badge-active{background:rgba(15,122,61,.12);color:#0f7a3d;}
.badge-disabled{background:rgba(192,57,43,.12);color:#c0392b;}

.mobile-toggle{display:none;}

@media (max-width: 860px){
  .sidebar{position:fixed;left:-260px;top:0;height:100vh;z-index:60;transition:left .2s;box-shadow:0 0 40px rgba(0,0,0,.15);}
  .sidebar.open{left:0;}
  .mobile-toggle{display:inline-flex;}
  .content{padding:16px;}
  .topbar{padding:12px 16px;}
  .search-box{max-width:none;}
  .grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:10px;}
}