/* Mailbox360 on Katalyst — shell layout, legacy-class compatibility, mail app.
   Local only. No external URLs. Version: kat1. */

/* ============ Shell ============ */
.mb360-app{display:flex;min-height:100dvh;background:var(--background);color:var(--foreground);font-family:var(--font-sans,var(--font-body,system-ui,sans-serif))}
.mb360-sidebar{width:248px;flex-shrink:0;border-right:1px solid var(--border);background:var(--card);display:flex;flex-direction:column;position:sticky;top:0;height:100dvh;z-index:30}
.mb360-brand{display:flex;align-items:center;gap:.6rem;padding:1rem 1.1rem;border-bottom:1px solid var(--border);font-weight:700;font-size:1.02rem;color:var(--foreground);text-decoration:none}
.mb360-brand-mark{width:34px;height:34px;border-radius:10px;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:1rem;flex-shrink:0}
.mb360-nav{flex:1;overflow-y:auto;padding:.75rem .6rem;display:flex;flex-direction:column;gap:2px}
.mb360-nav-label{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted-foreground);padding:.6rem .7rem .25rem}
.mb360-nav a{display:flex;align-items:center;gap:.7rem;padding:.55rem .7rem;border-radius:.6rem;color:var(--muted-foreground);text-decoration:none;font-size:.9rem;font-weight:500;transition:background .15s,color .15s}
.mb360-nav a:hover{background:var(--muted);color:var(--foreground)}
.mb360-nav a.active{background:color-mix(in oklch,var(--primary) 12%,transparent);color:var(--primary);font-weight:600}
.mb360-nav a svg{width:18px;height:18px;flex-shrink:0}
.mb360-side-foot{padding:.8rem;border-top:1px solid var(--border);font-size:.72rem;color:var(--muted-foreground);text-align:center}
.mb360-content{flex:1;min-width:0;display:flex;flex-direction:column;min-height:100dvh}
.mb360-topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:.75rem;padding:.65rem 1.25rem;border-bottom:1px solid var(--border);background:color-mix(in oklch,var(--card) 90%,transparent);backdrop-filter:blur(10px)}
.mb360-page-title{font-size:1.05rem;font-weight:700;margin:0;color:var(--foreground)}
.mb360-topbar-sub{font-size:.78rem;color:var(--muted-foreground)}
.mb360-topbar-spacer{flex:1}
.mb360-icon-btn{position:relative;display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:.65rem;border:1px solid var(--border);background:var(--card);color:var(--foreground);cursor:pointer;transition:background .15s}
.mb360-icon-btn:hover{background:var(--muted)}
.mb360-icon-btn svg{width:18px;height:18px}
.mb360-badge-dot{position:absolute;top:4px;right:4px;min-width:18px;height:18px;padding:0 5px;border-radius:999px;background:var(--destructive);color:#fff;font-size:.65rem;font-weight:700;display:inline-flex;align-items:center;justify-content:center}
.mb360-userchip{position:relative}
.mb360-userchip-btn{display:flex;align-items:center;gap:.55rem;border:1px solid var(--border);background:var(--card);border-radius:999px;padding:.28rem .7rem .28rem .3rem;cursor:pointer;color:var(--foreground)}
.mb360-userchip-btn:hover{background:var(--muted)}
.mb360-avatar{width:30px;height:30px;border-radius:999px;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:.8rem;flex-shrink:0}
.mb360-userchip-name{font-size:.85rem;font-weight:600;max-width:140px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mb360-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:220px;background:var(--popover,var(--card));border:1px solid var(--border);border-radius:.8rem;box-shadow:0 12px 32px rgba(0,0,0,.18);padding:.4rem;display:none;z-index:50}
.mb360-menu.show{display:block}
.mb360-menu a,.mb360-menu button{display:flex;align-items:center;gap:.6rem;width:100%;padding:.55rem .7rem;border-radius:.55rem;color:var(--foreground);text-decoration:none;font-size:.88rem;background:none;border:0;cursor:pointer;text-align:left}
.mb360-menu a:hover,.mb360-menu button:hover{background:var(--muted)}
.mb360-menu svg{width:16px;height:16px;color:var(--muted-foreground)}
.mb360-menu .mb360-menu-head{padding:.5rem .7rem;border-bottom:1px solid var(--border);margin-bottom:.3rem}
.mb360-menu .mb360-menu-head strong{display:block;font-size:.88rem}
.mb360-menu .mb360-menu-head span{font-size:.75rem;color:var(--muted-foreground)}
.mb360-theme-seg{display:flex;border:1px solid var(--border);border-radius:.65rem;overflow:hidden;background:var(--card)}
.mb360-theme-seg button{border:0;background:none;padding:.45rem .6rem;cursor:pointer;color:var(--muted-foreground);display:inline-flex}
.mb360-theme-seg button svg{width:16px;height:16px}
.mb360-theme-seg button[aria-selected="true"]{background:var(--muted);color:var(--foreground)}
.mb360-mobile-btn{display:none}
@media (max-width:900px){
  .mb360-sidebar{position:fixed;left:0;top:0;transform:translateX(-100%);transition:transform .25s ease;box-shadow:0 0 40px rgba(0,0,0,.25)}
  body.mb360-nav-open .mb360-sidebar{transform:none}
  .mb360-mobile-btn{display:inline-flex}
  .mb360-nav-scrim{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:25;display:none}
  body.mb360-nav-open .mb360-nav-scrim{display:block}
}
.mb360-footer{border-top:1px solid var(--border);padding:.8rem 1.25rem;font-size:.75rem;color:var(--muted-foreground);display:flex;justify-content:space-between;gap:1rem;background:var(--card)}
.main-content{flex:1;min-width:0;padding:1.25rem}
.page-content{max-width:1200px;margin:0 auto}
.page-title-box{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:1.1rem}
.page-title-box h4,.page-title-box h5{margin:0;font-size:1.25rem;font-weight:700}
.breadcrumb{display:flex;gap:.4rem;list-style:none;margin:0;padding:0;font-size:.8rem;color:var(--muted-foreground)}
.breadcrumb-item+.breadcrumb-item::before{content:"/";margin-right:.4rem;color:var(--border)}
.breadcrumb-item.active{color:var(--foreground);font-weight:600}

/* ============ Legacy class compatibility (Bootstrap/Symox-lookalike) ============ */
.row{display:flex;flex-wrap:wrap;margin-left:-.75rem;margin-right:-.75rem}
.row>[class*="col"]{padding-left:.75rem;padding-right:.75rem;min-width:0}
.col-12{flex:0 0 100%;max-width:100%}
.col-md-12{flex:0 0 100%;max-width:100%}
@media(min-width:768px){.col-md-6{flex:0 0 50%;max-width:50%}}
@media(max-width:767px){.col-md-6{flex:0 0 100%;max-width:100%}}
@media(min-width:992px){.col-lg-4{flex:0 0 33.3333%;max-width:33.3333%}.col-lg-8{flex:0 0 66.6667%;max-width:66.6667%}}
@media(max-width:991px){.col-lg-4,.col-lg-8{flex:0 0 100%;max-width:100%}}
@media(min-width:1200px){.col-xl-3{flex:0 0 25%;max-width:25%}.col-xl-4{flex:0 0 33.3333%;max-width:33.3333%}.col-xl-6{flex:0 0 50%;max-width:50%}.col-xl-8{flex:0 0 66.6667%;max-width:66.6667%}}
@media(max-width:1199px){.col-xl-3,.col-xl-4,.col-xl-6,.col-xl-8{flex:0 0 100%;max-width:100%}}
.card{background:var(--card);color:var(--card-foreground);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 1px 2px rgba(0,0,0,.05);margin-bottom:1.25rem}
.card-body{padding:1.25rem}
.card-header{padding:.85rem 1.25rem;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:1rem}
.card-title{margin:0;font-size:1rem;font-weight:700}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;font-weight:600;font-size:.875rem;line-height:1.4;padding:.55rem 1.05rem;border-radius:.6rem;border:1px solid transparent;cursor:pointer;text-decoration:none;transition:filter .15s,background .15s,color .15s;white-space:nowrap}
.btn:hover{filter:brightness(.96)}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn-secondary{background:var(--muted);border-color:var(--border);color:var(--foreground)}
.btn-light{background:var(--card);border-color:var(--border);color:var(--foreground)}
.btn-danger{background:var(--destructive);border-color:var(--destructive);color:#fff}
.btn-success{background:oklch(62% .16 150);border-color:oklch(62% .16 150);color:#fff}
.btn-warning{background:oklch(80% .15 85);border-color:oklch(80% .15 85);color:oklch(25% .02 85)}
.btn-info{background:var(--info);border-color:var(--info);color:#fff}
.btn-outline-primary{background:transparent;border-color:var(--primary);color:var(--primary)}
.btn-sm{padding:.32rem .65rem;font-size:.78rem;border-radius:.5rem}
.btn-lg{padding:.75rem 1.4rem;font-size:1rem}
.w-100{width:100%}
.btn-group{display:inline-flex;vertical-align:middle}
.btn-group .btn{border-radius:0}
.btn-group .btn:first-child{border-radius:.6rem 0 0 .6rem}
.btn-group .btn:last-child{border-radius:0 .6rem .6rem 0}
.form-label{display:block;margin-bottom:.35rem;font-size:.85rem;font-weight:600;color:var(--foreground)}
.form-control,.form-select{display:block;width:100%;padding:.55rem .75rem;font-size:.9rem;line-height:1.5;color:var(--foreground);background:var(--card);border:1px solid var(--input);border-radius:.6rem;transition:border-color .15s,box-shadow .15s}
.form-control:focus,.form-select:focus{outline:none;border-color:var(--ring);box-shadow:0 0 0 3px color-mix(in oklch,var(--ring) 22%,transparent)}
textarea.form-control{min-height:90px;resize:vertical}
.form-control::placeholder{color:var(--muted-foreground);opacity:.8}
.form-check{display:flex;align-items:center;gap:.5rem;margin-bottom:.5rem}
.form-check-input{width:1.05rem;height:1.05rem;accent-color:var(--primary);cursor:pointer;flex-shrink:0}
.form-text{font-size:.78rem;color:var(--muted-foreground);margin-top:.3rem}
.alert{padding:.75rem 1rem;border-radius:.65rem;border:1px solid var(--border);margin-bottom:1rem;font-size:.88rem}
.alert-danger{background:color-mix(in oklch,var(--destructive) 10%,var(--card));border-color:color-mix(in oklch,var(--destructive) 35%,transparent);color:var(--foreground)}
.alert-success{background:color-mix(in oklch,oklch(62% .16 150) 10%,var(--card));border-color:color-mix(in oklch,oklch(62% .16 150) 40%,transparent);color:var(--foreground)}
.alert-warning{background:color-mix(in oklch,oklch(80% .15 85) 14%,var(--card));border-color:color-mix(in oklch,oklch(80% .15 85) 45%,transparent);color:var(--foreground)}
.alert-info{background:color-mix(in oklch,var(--info) 10%,var(--card));border-color:color-mix(in oklch,var(--info) 40%,transparent);color:var(--foreground)}
.badge{display:inline-flex;align-items:center;padding:.22em .6em;font-size:.72rem;font-weight:700;border-radius:999px;line-height:1.4}
.bg-primary{background:var(--primary)!important;color:#fff}
.bg-primary-subtle{background:color-mix(in oklch,var(--primary) 14%,transparent)!important;color:var(--primary)}
.bg-light{background:var(--muted)!important;color:var(--foreground)}
.bg-danger{background:var(--destructive)!important;color:#fff}
.bg-success{background:oklch(62% .16 150)!important;color:#fff}
.bg-warning{background:oklch(80% .15 85)!important;color:oklch(25% .02 85)}
.text-primary{color:var(--primary)!important}
.text-muted{color:var(--muted-foreground)!important}
.text-white{color:#fff!important}
.text-info{color:var(--info)!important}
.text-danger{color:var(--destructive)!important}
.text-success{color:oklch(55% .16 150)!important}
.text-body{color:var(--foreground)!important}
.text-center{text-align:center!important}
.text-sm-end{text-align:right}
.table{width:100%;border-collapse:collapse;font-size:.88rem;color:var(--foreground)}
.table th,.table td{padding:.65rem .75rem;border-bottom:1px solid var(--border);text-align:left;vertical-align:middle}
.table thead th{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted-foreground);border-bottom:2px solid var(--border)}
.table-light thead th{background:var(--muted)}
.table-nowrap th,.table-nowrap td{white-space:nowrap}
.table-responsive{overflow-x:auto;-webkit-overflow-scrolling:touch}
.d-flex{display:flex!important}
.d-none{display:none!important}
.d-block{display:block!important}
.d-inline-block{display:inline-block!important}
.align-items-center{align-items:center!important}
.align-middle{vertical-align:middle!important}
.justify-content-between{justify-content:space-between!important}
.justify-content-center{justify-content:center!important}
.gap-2{gap:.5rem!important}
.flex-grow-1{flex-grow:1!important}
.flex-shrink-0{flex-shrink:0!important}
.overflow-hidden{overflow:hidden!important}
.m-0{margin:0!important}.mb-0{margin-bottom:0!important}.mb-1{margin-bottom:.25rem!important}.mb-2{margin-bottom:.5rem!important}.mb-3{margin-bottom:1rem!important}.mb-4{margin-bottom:1.5rem!important}
.mt-1{margin-top:.25rem!important}.mt-2{margin-top:.5rem!important}.mt-3{margin-top:1rem!important}.mt-4{margin-top:1.5rem!important}
.me-1{margin-right:.25rem!important}.me-2{margin-right:.5rem!important}.me-3{margin-right:1rem!important}.me-auto{margin-right:auto!important}
.ms-1{margin-left:.25rem!important}.ms-2{margin-left:.5rem!important}
.my-1{margin-top:.25rem!important;margin-bottom:.25rem!important}
.p-0{padding:0!important}.p-2{padding:.5rem!important}.p-3{padding:1rem!important}.p-4{padding:1.5rem!important}
.py-2{padding-top:.5rem!important;padding-bottom:.5rem!important}
.px-3{padding-left:1rem!important;padding-right:1rem!important}
.float-end{float:right!important}
.rounded-circle{border-radius:50%!important}
.img-thumbnail{max-width:120px;border-radius:.6rem;border:1px solid var(--border);padding:.25rem;background:var(--card)}
.small,small{font-size:.82em}
.fw-medium{font-weight:600!important}
.font-size-13{font-size:13px}.font-size-14{font-size:14px}.font-size-16{font-size:16px}.font-size-20{font-size:20px}
.avatar-sm{display:inline-flex}
.avatar-title{width:38px;height:38px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:var(--muted);color:var(--primary);font-weight:700}
.dropdown{position:relative}
.dropdown-toggle{cursor:pointer}
.dropdown-menu{position:absolute;top:100%;left:0;z-index:60;display:none;min-width:11rem;padding:.4rem;margin-top:.25rem;background:var(--popover,var(--card));border:1px solid var(--border);border-radius:.65rem;box-shadow:0 12px 30px rgba(0,0,0,.16)}
.dropdown-menu.show{display:block}
.dropdown-menu-end{right:0;left:auto}
.dropdown-item{display:flex;align-items:center;gap:.5rem;width:100%;padding:.5rem .75rem;clear:both;font-size:.88rem;color:var(--foreground);text-decoration:none;background:none;border:0;cursor:pointer;border-radius:.45rem;text-align:left}
.dropdown-item:hover{background:var(--muted)}
.list-group{display:flex;flex-direction:column;border:1px solid var(--border);border-radius:.65rem;overflow:hidden;margin-bottom:1rem}
.list-group-item{padding:.7rem 1rem;background:var(--card);border-bottom:1px solid var(--border);color:var(--foreground);text-decoration:none;font-size:.9rem}
.list-group-item:last-child{border-bottom:0}
.list-group-item-action{cursor:pointer}
.list-group-item-action:hover{background:var(--muted)}
.modal{position:fixed;inset:0;z-index:100;display:none;overflow-y:auto}
.modal.show{display:block}
.modal-backdrop{position:fixed;inset:0;z-index:99;background:rgba(0,0,0,.5)}
.modal-dialog{position:relative;max-width:520px;margin:3rem auto;z-index:101;pointer-events:none}
.modal-dialog-centered{display:flex;align-items:center;min-height:calc(100% - 6rem)}
.modal-content{pointer-events:auto;background:var(--card);color:var(--foreground);border:1px solid var(--border);border-radius:.9rem;box-shadow:0 24px 60px rgba(0,0,0,.3);width:100%}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.25rem;border-bottom:1px solid var(--border)}
.modal-title{margin:0;font-size:1.05rem;font-weight:700}
.modal-body{padding:1.25rem}
.modal-footer{display:flex;align-items:center;justify-content:flex-end;gap:.6rem;padding:1rem 1.25rem;border-top:1px solid var(--border)}
.btn-close{background:none;border:0;font-size:1.2rem;cursor:pointer;color:var(--muted-foreground);line-height:1;padding:.25rem}
.btn-close::before{content:"\00D7"}
.fade{transition:opacity .15s linear}
.spinner-border{display:inline-block;width:1.6rem;height:1.6rem;border:.22em solid currentColor;border-right-color:transparent;border-radius:50%;animation:mb360-spin .75s linear infinite;vertical-align:middle}
.spinner-border-sm{width:1rem;height:1rem;border-width:.18em}
@keyframes mb360-spin{to{transform:rotate(360deg)}}
i.bx,i.mdi,i.fa,i.fab,i.far{font-style:normal}
.container-fluid{width:100%;padding-left:.75rem;padding-right:.75rem}

/* ============ Mail app (mailbox.php 3-pane) ============ */
.mb360-mailwrap{flex:1;min-height:0;display:flex;padding:1rem;gap:0}
.kat-card{flex:1;min-height:0;display:flex;background:var(--card);color:var(--card-foreground);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 1px 2px rgba(0,0,0,.05);overflow:hidden}
/* Folder rail */
#kat-folder-rail{width:236px;flex-shrink:0;border-right:1px solid var(--border);background:color-mix(in oklch,var(--muted) 35%,transparent);display:flex;flex-direction:column;height:100%;overflow:hidden}
.kat-rail-top{padding:.9rem;border-bottom:1px solid var(--border);display:flex;flex-direction:column;gap:.6rem}
.kat-compose-btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;width:100%;padding:.6rem 1rem;border-radius:.65rem;border:0;background:var(--primary);color:#fff;font-weight:600;font-size:.9rem;cursor:pointer}
.kat-compose-btn:hover{filter:brightness(.95)}
.kat-compose-btn svg{width:16px;height:16px}
.kat-sync-btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;width:100%;padding:.5rem 1rem;border-radius:.65rem;border:1px solid var(--border);background:var(--card);color:var(--foreground);font-weight:600;font-size:.85rem;cursor:pointer}
.kat-sync-btn:hover{background:var(--muted)}
.kat-sync-btn:disabled{opacity:.6;cursor:wait}
.kat-sync-btn svg{width:15px;height:15px}
.kat-rail-scroll{flex:1;min-height:0;overflow-y:auto;padding:.6rem}
.kat-rail-label{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted-foreground);padding:.55rem .6rem .3rem}
.kat-folder{display:flex;align-items:center;gap:.65rem;width:100%;padding:.5rem .65rem;border:0;border-radius:.6rem;background:none;color:var(--muted-foreground);font-size:.88rem;font-weight:500;cursor:pointer;text-align:left}
.kat-folder:hover{background:var(--muted);color:var(--foreground)}
.kat-folder.active{background:color-mix(in oklch,var(--primary) 12%,transparent);color:var(--primary);font-weight:600}
.kat-folder svg{width:16px;height:16px;flex-shrink:0}
.kat-folder .kat-count{margin-left:auto;font-size:.7rem;font-weight:700;background:var(--muted);color:var(--muted-foreground);border-radius:999px;padding:.1rem .5rem;min-width:1.6rem;text-align:center}
.kat-folder.active .kat-count{background:var(--primary);color:#fff}
.kat-account-filter{width:100%;margin-top:.35rem}
.kat-label-row{display:flex;align-items:center;gap:.5rem;padding:.35rem .6rem;border-radius:.55rem;font-size:.85rem;color:var(--foreground);cursor:pointer;border:0;background:none;width:100%;text-align:left}
.kat-label-row:hover{background:var(--muted)}
.kat-label-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}
.kat-label-new{display:flex;gap:.4rem;padding:.5rem .6rem}
.kat-label-new input{flex:1;min-width:0;padding:.4rem .6rem;font-size:.82rem;border:1px solid var(--input);border-radius:.55rem;background:var(--card);color:var(--foreground)}
.kat-empty-note{font-size:.82rem;color:var(--muted-foreground);padding:.4rem .6rem}
/* Message list column */
#kat-list-col{width:380px;flex-shrink:0;border-right:1px solid var(--border);display:flex;flex-direction:column;height:100%;min-width:0}
.kat-list-head{padding:.8rem .9rem;border-bottom:1px solid var(--border);display:flex;flex-direction:column;gap:.6rem}
.kat-list-title-row{display:flex;align-items:center;justify-content:space-between;gap:.6rem}
#kat-folder-title{font-size:1.02rem;font-weight:700;margin:0}
.kat-toolbar{display:flex;align-items:center;gap:.35rem;flex-wrap:wrap}
.kat-tool-btn{display:inline-flex;align-items:center;gap:.35rem;padding:.4rem .55rem;border-radius:.55rem;border:1px solid var(--border);background:var(--card);color:var(--foreground);font-size:.78rem;font-weight:600;cursor:pointer}
.kat-tool-btn:hover{background:var(--muted)}
.kat-tool-btn:disabled{opacity:.5;cursor:not-allowed}
.kat-tool-btn svg{width:14px;height:14px}
.kat-tool-btn.danger{color:var(--destructive)}
.kat-search{width:100%;padding:.5rem .7rem;font-size:.85rem;border:1px solid var(--input);border-radius:.6rem;background:var(--card);color:var(--foreground)}
#kat-message-list{flex:1;min-height:0;overflow-y:auto}
.kat-row{display:flex;gap:.6rem;align-items:flex-start;width:100%;padding:.7rem .85rem;border:0;border-bottom:1px solid var(--border);background:none;cursor:pointer;text-align:left;color:var(--foreground)}
.kat-row:hover{background:color-mix(in oklch,var(--muted) 45%,transparent)}
.kat-row.selected{background:color-mix(in oklch,var(--primary) 10%,transparent)}
.kat-row.unread .kat-sender,.kat-row.unread .kat-subject{font-weight:700}
.kat-row-main{flex:1;min-width:0}
.kat-row-top{display:flex;align-items:center;gap:.5rem}
.kat-sender{font-size:.86rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1;min-width:0}
.kat-date{font-size:.72rem;color:var(--muted-foreground);flex-shrink:0}
.kat-subject{font-size:.84rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:1px}
.kat-snippet{font-size:.78rem;color:var(--muted-foreground);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:1px}
.kat-unread-dot{width:8px;height:8px;border-radius:50%;background:var(--primary);flex-shrink:0;margin-top:6px;visibility:hidden}
.kat-row.unread .kat-unread-dot{visibility:visible}
.kat-star{background:none;border:0;cursor:pointer;color:var(--muted-foreground);padding:.15rem;display:inline-flex;flex-shrink:0}
.kat-star svg{width:16px;height:16px}
.kat-star.on{color:oklch(80% .15 85)}
.kat-star.on svg{fill:currentColor}
.kat-check{width:16px;height:16px;accent-color:var(--primary);cursor:pointer;flex-shrink:0;margin-top:3px}
.kat-pills{display:flex;flex-wrap:wrap;gap:.3rem;margin-top:.3rem}
.kat-pill{display:inline-flex;align-items:center;gap:.3rem;font-size:.68rem;font-weight:600;border-radius:999px;padding:.12rem .55rem;color:#fff}
.kat-pill button{background:none;border:0;color:inherit;cursor:pointer;font-size:.75rem;line-height:1;padding:0}
.kat-list-empty{padding:2.5rem 1.5rem;text-align:center;color:var(--muted-foreground);font-size:.88rem}
.kat-pager{display:flex;align-items:center;justify-content:space-between;gap:.6rem;padding:.6rem .9rem;border-top:1px solid var(--border);font-size:.78rem;color:var(--muted-foreground)}
.kat-pager-btns{display:flex;gap:.35rem}
.kat-skel{padding:.7rem .85rem;border-bottom:1px solid var(--border)}
.kat-skel span{display:block;height:.75rem;border-radius:.4rem;background:linear-gradient(90deg,var(--muted) 25%,color-mix(in oklch,var(--muted) 55%,var(--card)) 50%,var(--muted) 75%);background-size:200% 100%;animation:kat-shimmer 1.2s infinite}
@keyframes kat-shimmer{to{background-position:-200% 0}}
/* Reading pane */
#kat-reading-pane{flex:1;min-width:0;display:flex;flex-direction:column;height:100%;background:var(--card)}
.kat-read-empty{margin:auto;text-align:center;color:var(--muted-foreground);padding:2rem}
.kat-read-empty svg{width:44px;height:44px;margin-bottom:.8rem;opacity:.5}
.kat-read-head{padding:1rem 1.25rem .8rem;border-bottom:1px solid var(--border)}
#kat-read-subject{font-size:1.15rem;font-weight:700;margin:0 0 .6rem;line-height:1.35}
.kat-read-meta{display:flex;align-items:center;gap:.7rem}
.kat-meta-text{min-width:0;flex:1}
.kat-meta-line{font-size:.83rem;color:var(--muted-foreground);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.kat-meta-line strong{color:var(--foreground);font-weight:600}
.kat-read-actions{display:flex;gap:.35rem;flex-wrap:wrap;padding:.6rem 1.25rem;border-bottom:1px solid var(--border)}
.kat-read-scroll{flex:1;min-height:0;overflow-y:auto;padding:1.1rem 1.25rem}
#kat-read-body-frame{width:100%;min-height:320px;border:0;background:var(--card)}
.kat-read-text{white-space:pre-wrap;font-size:.92rem;line-height:1.6;color:var(--foreground);font-family:inherit}
.kat-attach{margin-top:1rem;border-top:1px solid var(--border);padding-top:.8rem}
.kat-attach h4{font-size:.82rem;font-weight:700;margin:0 0 .5rem;color:var(--muted-foreground);text-transform:uppercase;letter-spacing:.05em}
.kat-attach a{display:flex;align-items:center;gap:.6rem;padding:.5rem .65rem;border:1px solid var(--border);border-radius:.6rem;margin-bottom:.4rem;text-decoration:none;color:var(--foreground);font-size:.85rem}
.kat-attach a:hover{background:var(--muted)}
.kat-attach svg{width:16px;height:16px;color:var(--muted-foreground);flex-shrink:0}
/* Compose modal */
#kat-compose-modal{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;background:rgba(0,0,0,.5);padding:1rem}
#kat-compose-modal.show{display:flex}
.kat-compose-dialog{width:640px;max-width:100%;max-height:92dvh;display:flex;flex-direction:column;background:var(--card);color:var(--foreground);border:1px solid var(--border);border-radius:.9rem;box-shadow:0 24px 60px rgba(0,0,0,.3)}
.kat-compose-head{display:flex;align-items:center;justify-content:space-between;padding:.9rem 1.1rem;border-bottom:1px solid var(--border)}
.kat-compose-head h3{margin:0;font-size:1rem;font-weight:700}
.kat-compose-body{padding:1rem 1.1rem;overflow-y:auto;display:flex;flex-direction:column;gap:.7rem}
.kat-compose-row{display:flex;align-items:center;gap:.6rem}
.kat-compose-row label{font-size:.8rem;font-weight:600;color:var(--muted-foreground);width:52px;flex-shrink:0}
.kat-compose-row input,.kat-compose-row select,.kat-compose-row textarea{flex:1;min-width:0;padding:.5rem .7rem;font-size:.88rem;border:1px solid var(--input);border-radius:.6rem;background:var(--card);color:var(--foreground)}
.kat-compose-row textarea{min-height:220px;resize:vertical;font-family:inherit;line-height:1.55}
.kat-cc-toggle{font-size:.78rem;color:var(--primary);background:none;border:0;cursor:pointer;font-weight:600}
.kat-compose-foot{display:flex;align-items:center;gap:.6rem;padding:.85rem 1.1rem;border-top:1px solid var(--border)}
.kat-attach-list{font-size:.8rem;color:var(--muted-foreground)}
.kat-attach-list .kat-pill{margin-right:.3rem}
/* Toasts */
#kat-toasts{position:fixed;right:1rem;bottom:1rem;z-index:400;display:flex;flex-direction:column;gap:.5rem;max-width:min(360px,90vw)}
.kat-toast{display:flex;align-items:flex-start;gap:.6rem;padding:.7rem .9rem;border-radius:.7rem;font-size:.85rem;font-weight:500;box-shadow:0 12px 30px rgba(0,0,0,.22);border:1px solid var(--border);background:var(--card);color:var(--foreground);animation:kat-toast-in .2s ease}
.kat-toast.success{border-left:4px solid oklch(62% .16 150)}
.kat-toast.error{border-left:4px solid var(--destructive)}
.kat-toast.info{border-left:4px solid var(--info)}
.kat-toast button{margin-left:auto;background:none;border:0;cursor:pointer;color:var(--muted-foreground);font-size:1rem;line-height:1}
@keyframes kat-toast-in{from{opacity:0;transform:translateY(8px)}}
/* Login */
.mb360-login-wrap{min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:1.5rem;background:radial-gradient(1200px 600px at 20% -10%,color-mix(in oklch,var(--primary) 14%,transparent),transparent),var(--background)}
.mb360-login-card{width:420px;max-width:100%;background:var(--card);border:1px solid var(--border);border-radius:1rem;box-shadow:0 24px 60px rgba(0,0,0,.18);padding:2rem}
.mb360-login-logo{display:flex;align-items:center;justify-content:center;gap:.6rem;margin-bottom:1.4rem;font-size:1.3rem;font-weight:800}
.mb360-login-card h1{font-size:1.25rem;font-weight:700;text-align:center;margin:0 0 .3rem}
.mb360-login-card .mb360-login-sub{text-align:center;color:var(--muted-foreground);font-size:.88rem;margin-bottom:1.4rem}
.mb360-login-foot{text-align:center;margin-top:1.5rem;font-size:.75rem;color:var(--muted-foreground)}
.dns-status{font-size:.8rem;padding:.35rem .6rem;border-radius:.5rem;background:var(--muted);display:inline-block}
@media (max-width:1100px){#kat-list-col{width:300px}}
@media (max-width:900px){
  .mb360-mailwrap{padding:.5rem}
  #kat-folder-rail{display:none}
  #kat-list-col{width:100%;border-right:0}
  #kat-reading-pane{display:none}
  body.kat-reading-open #kat-list-col{display:none}
  body.kat-reading-open #kat-reading-pane{display:flex}
}

/* topbar tab navigation (sidebar-less mode) */
.mb360-topbar-tabs{gap:.9rem}
.mb360-topnav{display:flex;align-items:center;gap:.15rem;overflow-x:auto;scrollbar-width:none;min-width:0}
.mb360-topnav::-webkit-scrollbar{display:none}
.mb360-topnav a{display:inline-flex;align-items:center;gap:.45rem;padding:.5rem .7rem;border-radius:.55rem;color:var(--muted-foreground);font-size:.85rem;font-weight:500;white-space:nowrap;text-decoration:none;flex-shrink:0}
.mb360-topnav a svg{width:16px;height:16px;flex-shrink:0}
.mb360-topnav a:hover{background:var(--muted);color:var(--foreground)}
.mb360-topnav a.active{background:var(--primary);color:#fff}
@media (max-width:900px){.mb360-topnav a span{display:none}.mb360-topnav a{padding:.5rem}}

/* ---- super mobile friendly ---- */
.kat-rail-toggle{display:none}
.kat-back-btn{display:none}
.kat-rail-scrim{display:none}
@media (max-width:900px){
  /* folder rail becomes a slide-over drawer */
  #kat-folder-rail{position:fixed;top:0;left:0;bottom:0;width:288px;max-width:86vw;z-index:60;
    transform:translateX(-106%);transition:transform .25s ease;display:flex;flex-direction:column;
    background:var(--card);border-right:1px solid var(--border);box-shadow:24px 0 60px rgba(0,0,0,.28)}
  body.kat-rail-open #kat-folder-rail{transform:none}
  .kat-rail-scrim{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:55}
  body.kat-rail-open .kat-rail-scrim{display:block}
  .kat-rail-toggle{display:inline-flex}
  /* reading pane: full-screen with back button */
  #kat-reading-pane{position:fixed;inset:0;z-index:50;background:var(--background)}
  body.kat-reading-open #kat-reading-pane{display:flex;flex-direction:column}
  .kat-back-btn{display:inline-flex}
  .kat-read-head{position:sticky;top:0;background:var(--card);z-index:2}
  /* compose: full-screen sheet */
  #kat-compose-modal{padding:0}
  .kat-compose-dialog{width:100%;max-width:100%;height:100dvh;max-height:100dvh;border-radius:0;border:0}
  .kat-compose-row textarea{min-height:40dvh}
  /* touch targets + comfortable rows */
  .kat-row{min-height:64px;padding:.8rem .9rem}
  .kat-tool-btn{min-height:42px;min-width:42px}
  .kat-compose-btn,.kat-sync-btn{min-height:46px}
  .kat-folder{min-height:46px;font-size:.95rem}
  /* list header stacks nicely */
  .kat-list-title-row{flex-wrap:wrap}
  .kat-search{font-size:16px} /* prevents iOS auto-zoom */
  .kat-pager{flex-wrap:wrap;gap:.5rem}
  /* topbar stays usable */
  .mb360-topbar{padding:.6rem .8rem;gap:.6rem}
  .mb360-userchip-name{display:none}
}

/* ---- rich-text compose editor ---- */
.kat-rte-wrap{flex:1;min-width:0;display:flex;flex-direction:column;border:1px solid var(--input);border-radius:.6rem;overflow:hidden;background:var(--card)}
.kat-rte-wrap:focus-within{border-color:var(--primary);box-shadow:0 0 0 2px color-mix(in oklch,var(--primary) 25%,transparent)}
.kat-rte-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:.15rem;padding:.35rem .5rem;background:color-mix(in oklch,var(--muted) 45%,transparent);border-bottom:1px solid var(--border)}
.kat-rte-toolbar button{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border:0;border-radius:.4rem;background:transparent;color:var(--muted-foreground);cursor:pointer}
.kat-rte-toolbar button svg{width:16px;height:16px}
.kat-rte-toolbar button:hover{background:color-mix(in oklch,var(--primary) 12%,transparent);color:var(--foreground)}
.kat-rte-toolbar button.rte-active{background:color-mix(in oklch,var(--primary) 20%,transparent);color:var(--primary)}
.kat-rte-sep{width:1px;height:20px;background:var(--border);margin:0 .25rem;flex-shrink:0}
.kat-rte-color{position:relative;display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:.4rem;cursor:pointer;color:var(--muted-foreground)}
.kat-rte-color:hover{background:color-mix(in oklch,var(--primary) 12%,transparent);color:var(--foreground)}
.kat-rte-color svg{width:16px;height:16px;pointer-events:none}
.kat-rte-color input[type=color]{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}
.kat-rte{min-height:220px;max-height:46dvh;overflow-y:auto;padding:.7rem .9rem;font-size:.9rem;line-height:1.6;outline:none;word-wrap:break-word}
.kat-rte:empty:before{content:attr(data-placeholder);color:var(--muted-foreground);pointer-events:none}
.kat-rte p{margin:0 0 .6em}
.kat-rte h3{margin:.4em 0;font-size:1.1em}
.kat-rte blockquote{margin:.4em 0;padding:.4em .8em;border-left:3px solid var(--primary);background:color-mix(in oklch,var(--primary) 7%,transparent);border-radius:0 .4rem .4rem 0}
.kat-rte ul,.kat-rte ol{margin:.4em 0;padding-left:1.6em}
.kat-rte a{color:var(--primary)}
/* ---- conversation threads: list rows ---- */
.kat-thread-count{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;padding:0 6px;border-radius:999px;background:color-mix(in oklch,var(--primary) 16%,transparent);color:var(--primary);font-size:.72rem;font-weight:700;margin-left:.45rem;vertical-align:2px}
.kat-thread-participants{font-weight:600}
/* ---- conversation view: reading pane ---- */
.kat-thread-subject-row{display:flex;align-items:center;gap:.6rem;padding:.9rem 1.1rem;border-bottom:1px solid var(--border)}
.kat-thread-subject-row h2{margin:0;font-size:1.05rem;font-weight:700;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.kat-thread-actions{display:flex;align-items:center;gap:.4rem;padding:.55rem 1.1rem;border-bottom:1px solid var(--border);flex-wrap:wrap;background:color-mix(in oklch,var(--muted) 28%,transparent)}
.kat-thread-scroll{flex:1;min-height:0;overflow-y:auto;padding:1rem 1.1rem;display:flex;flex-direction:column;gap:.7rem}
.kat-msgcard{border:1px solid var(--border);border-radius:.8rem;background:var(--card);overflow:hidden;flex-shrink:0}
.kat-msgcard-head{display:flex;align-items:center;gap:.7rem;padding:.7rem .9rem;cursor:pointer;user-select:none}
.kat-msgcard-head:hover{background:color-mix(in oklch,var(--muted) 30%,transparent)}
.kat-msgcard-head .mb360-avatar{width:34px;height:34px;font-size:.85rem;flex-shrink:0}
.kat-msgcard-meta{flex:1;min-width:0}
.kat-msgcard-from{font-weight:600;font-size:.88rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.kat-msgcard-snippet{font-size:.8rem;color:var(--muted-foreground);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.kat-msgcard-date{font-size:.78rem;color:var(--muted-foreground);flex-shrink:0}
.kat-msgcard-chevron{flex-shrink:0;color:var(--muted-foreground);transition:transform .15s ease;display:inline-flex}
.kat-msgcard-chevron svg{width:16px;height:16px}
.kat-msgcard.open .kat-msgcard-chevron{transform:rotate(180deg)}
.kat-msgcard-body{display:none;border-top:1px solid var(--border)}
.kat-msgcard.open .kat-msgcard-body{display:block}
.kat-msgcard-actions{display:flex;align-items:center;gap:.35rem;flex-wrap:wrap;padding:.5rem .9rem;border-bottom:1px solid var(--border);background:color-mix(in oklch,var(--muted) 22%,transparent)}
.kat-msgcard-actions .kat-tool-btn{min-height:34px}
.kat-msgcard-frame{width:100%;min-height:200px;border:0;background:var(--card);display:block}
.kat-msgcard-text{padding:.9rem 1rem;font-size:.9rem;line-height:1.65;white-space:pre-wrap;word-wrap:break-word}
.kat-thread-labels{display:flex;flex-wrap:wrap;gap:.3rem;padding:.5rem 1.1rem 0}
/* new-message flash on auto-load */
@keyframes kat-new-flash{0%{background:color-mix(in oklch,var(--primary) 22%,transparent)}100%{background:transparent}}
.kat-row.kat-new{animation:kat-new-flash 2.2s ease}
/* thread toggle active state */
#kat-thread-toggle[aria-pressed="true"]{color:var(--primary);border-color:color-mix(in oklch,var(--primary) 45%,transparent)}
@media (max-width:900px){
  .kat-rte{min-height:38dvh}
  .kat-rte-toolbar button{width:34px;height:34px}
  .kat-thread-actions{padding:.5rem .8rem}
  .kat-thread-scroll{padding:.8rem}
}