:root{
  --color-primary:#1690c4;
  --color-primary-dark:#0f6f9c;
  --color-navy:#2c3a52;
  --color-navy-dark:#232e42;
  --color-sidebar-bg:#ffffff;
  --color-sidebar-text:#4a4a4a;
  --color-sidebar-hover:#eef6fb;
  --color-sidebar-active-text:#1690c4;
  --color-tab-active-bg:#222222;
  --color-tab-inactive-bg:#ffffff;
  --color-success:#3ac47d;
  --color-success-dark:#2fa868;
  --color-danger:#e2574c;
  --color-danger-dark:#c8483e;
  --color-border:#e3e6ec;
  --color-bg-page:#f4f6f9;
  --color-row-alt:#f8f9fb;
  --color-text:#333333;
  --color-text-muted:#8a8f9c;
  --sidebar-width:230px;
  --topbar-height:56px;
}

*{box-sizing:border-box;}
html,body{margin:0; height:100%; font-family:'Malgun Gothic','Segoe UI',system-ui,sans-serif; color:var(--color-text); background:var(--color-bg-page);}
button{font-family:inherit; cursor:pointer;}
input,select,textarea{font-family:inherit;}
[hidden]{display:none !important;}

/* ---------- Login screen ---------- */
#loginScreen{
  position:fixed; inset:0; display:flex; align-items:center; justify-content:center;
  background:linear-gradient(160deg,#0f6f9c,#1690c4 45%,#38a9d6);
}
.login-card{
  width:360px; background:#fff; border-radius:14px; padding:40px 36px;
  box-shadow:0 20px 50px rgba(0,0,0,.25); text-align:center;
}
.login-logo{font-size:26px; font-weight:800; color:var(--color-primary); letter-spacing:1px; margin-bottom:4px;}
.login-sub{font-size:13px; color:var(--color-text-muted); margin-bottom:28px;}
.login-field{text-align:left; margin-bottom:14px;}
.login-field label{display:block; font-size:12px; color:var(--color-text-muted); margin-bottom:6px;}
.login-field input{
  width:100%; padding:11px 12px; border:1px solid var(--color-border); border-radius:8px;
  font-size:14px; outline:none; transition:.15s;
}
.login-field input:focus{border-color:var(--color-primary); box-shadow:0 0 0 3px rgba(22,144,196,.15);}
.login-btn{
  width:100%; padding:12px; margin-top:10px; border:none; border-radius:8px;
  background:var(--color-primary); color:#fff; font-size:15px; font-weight:700;
}
.login-btn:hover{background:var(--color-primary-dark);}
.login-error{color:var(--color-danger); font-size:12px; margin-top:10px; min-height:16px;}
.login-hint{margin-top:18px; font-size:11px; color:var(--color-text-muted); line-height:1.6;}

/* ---------- App shell ---------- */
#appShell{display:none; height:100vh; flex-direction:column;}
#appShell.active{display:flex;}

.topbar{
  height:var(--topbar-height); background:var(--color-primary); color:#fff;
  display:flex; align-items:center; justify-content:space-between; padding:0 18px;
  flex-shrink:0; box-shadow:0 2px 6px rgba(0,0,0,.12); z-index:5;
}
.topbar-logo{font-size:19px; font-weight:800; letter-spacing:1px; display:flex; align-items:center; gap:8px;}
.topbar-right{display:flex; align-items:center; gap:12px; font-size:13px;}
.user-badge{background:rgba(255,255,255,.18); padding:6px 14px; border-radius:999px; font-weight:600;}
.logout-btn{
  background:rgba(0,0,0,.18); border:none; color:#fff; padding:6px 14px; border-radius:999px; font-size:12px;
}
.logout-btn:hover{background:rgba(0,0,0,.32);}

.body-row{flex:1; display:flex; min-height:0;}

/* ---------- Sidebar ---------- */
.sidebar{
  width:var(--sidebar-width); background:var(--color-sidebar-bg); border-right:1px solid var(--color-border);
  display:flex; flex-direction:column; flex-shrink:0; overflow-y:auto;
}
.sidebar-search{padding:14px 14px 8px;}
.sidebar-search input{
  width:100%; padding:8px 12px; border:1px solid var(--color-border); border-radius:8px; font-size:13px;
}
.menu-l1{border-bottom:1px solid #f0f1f4;}
.menu-l1-head{
  display:flex; align-items:center; justify-content:space-between; padding:12px 16px;
  font-size:13.5px; font-weight:600; color:var(--color-sidebar-text); user-select:none;
}
.menu-l1-head:hover{background:var(--color-sidebar-hover); color:var(--color-sidebar-active-text);}
.menu-l1-head .chev{transition:transform .15s; font-size:10px; color:var(--color-text-muted);}
.menu-l1.open .menu-l1-head .chev{transform:rotate(90deg);}
.menu-l2-wrap{max-height:0; overflow:hidden; transition:max-height .2s ease;}
.menu-l1.open .menu-l2-wrap{max-height:400px;}
.menu-l2-item{
  padding:10px 16px 10px 34px; font-size:13px; color:var(--color-sidebar-text);
  cursor:pointer; border-left:3px solid transparent;
}
.menu-l2-item:hover{background:var(--color-sidebar-hover); color:var(--color-sidebar-active-text);}
.menu-l2-item.active{background:var(--color-sidebar-hover); color:var(--color-sidebar-active-text); border-left-color:var(--color-primary); font-weight:700;}

/* ---------- Tab bar + content ---------- */
.content-col{flex:1; display:flex; flex-direction:column; min-width:0; min-height:0;}
.tabbar{
  display:flex; align-items:center; gap:6px; background:#eef1f5; padding:8px 12px 0;
  border-bottom:1px solid var(--color-border); flex-shrink:0; overflow-x:auto;
}
.tab{
  display:flex; align-items:center; gap:8px; padding:9px 16px; border-radius:8px 8px 0 0;
  background:var(--color-tab-inactive-bg); color:var(--color-text); font-size:13px;
  border:1px solid var(--color-border); border-bottom:none; cursor:pointer; white-space:nowrap;
}
.tab.active{background:var(--color-tab-active-bg); color:#fff; border-color:var(--color-tab-active-bg);}
.tab .tab-close{font-size:12px; opacity:.6;}
.tab .tab-close:hover{opacity:1;}
.tab.active .tab-close{color:#fff;}

.page-area{flex:1; overflow-y:auto; padding:16px 20px 32px;}
.page{display:none;}
.page.active{display:block;}

.page-title-row{display:flex; align-items:baseline; gap:10px; margin-bottom:14px;}
.page-title-row h2{margin:0; font-size:18px; color:var(--color-text);}
.page-title-row .page-desc{font-size:12.5px; color:var(--color-text-muted);}

/* ---------- Toolbar (blue action bar) ---------- */
.toolbar{
  background:var(--color-primary); border-radius:8px 8px 0 0; padding:10px 14px;
  display:flex; align-items:center; justify-content:space-between; color:#fff;
}
.toolbar-actions{display:flex; gap:8px;}
.toolbar-btn{
  background:rgba(255,255,255,.15); border:none; color:#fff; padding:7px 13px;
  border-radius:6px; font-size:12.5px; display:flex; align-items:center; gap:6px;
}
.toolbar-btn:hover{background:rgba(255,255,255,.28);}
.toolbar-toggle{background:none; border:none; color:#fff; font-size:12px; opacity:.9;}

/* ---------- Filter panel ---------- */
.filter-panel{
  background:#fff; border:1px solid var(--color-border); border-top:none; padding:16px;
  display:flex; flex-wrap:wrap; gap:16px; align-items:flex-end;
}
.filter-field{display:flex; flex-direction:column; gap:5px; min-width:170px;}
.filter-field label{font-size:12px; font-weight:700; color:var(--color-text);}
.filter-field input, .filter-field select{
  padding:8px 10px; border:1px solid var(--color-border); border-radius:6px; font-size:13px;
}
.filter-checks{display:flex; gap:14px; align-items:center; font-size:13px; padding-bottom:8px;}
.filter-checks label{display:flex; align-items:center; gap:5px;}

/* ---------- List header (title + add/delete/save) ---------- */
.list-header{
  background:#fff; border:1px solid var(--color-border); border-top:none; padding:14px 16px;
  display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:10px;
}
.list-header-title{display:flex; align-items:baseline; gap:10px;}
.list-header-title b{font-size:15px;}
.list-header-title span{font-size:12px; color:var(--color-text-muted);}
.list-header-actions{display:flex; gap:8px; align-items:center;}
.row-count{width:52px; padding:6px 8px; border:1px solid var(--color-border); border-radius:6px; text-align:center; font-size:13px;}
.btn{border:none; border-radius:6px; padding:8px 14px; font-size:12.5px; font-weight:700; color:#fff; display:flex; align-items:center; gap:6px;}
.btn-add{background:var(--color-success);} .btn-add:hover{background:var(--color-success-dark);}
.btn-delete{background:var(--color-danger);} .btn-delete:hover{background:var(--color-danger-dark);}
.btn-save{background:var(--color-navy);} .btn-save:hover{background:var(--color-navy-dark);}
.btn-secondary{background:#fff; color:var(--color-text); border:1px solid var(--color-border);}
.btn-secondary:hover{background:var(--color-row-alt);}
.btn:disabled, .toolbar-btn:disabled, .cal-nav-btn:disabled, .modal-close:disabled{opacity:.6; cursor:not-allowed; pointer-events:none;}
.spin{display:inline-block; width:11px; height:11px; border:2px solid rgba(255,255,255,.5); border-top-color:#fff; border-radius:50%; animation:spin .7s linear infinite; margin-right:2px;}
.spin.dark{border:2px solid rgba(0,0,0,.15); border-top-color:var(--color-primary);}
@keyframes spin{to{transform:rotate(360deg);}}
.loading-row{padding:40px; text-align:center; color:var(--color-text-muted); font-size:13px;}

/* ---------- Data grid ---------- */
.grid-wrap{background:#fff; border:1px solid var(--color-border); border-top:none; border-radius:0 0 8px 8px; overflow-x:auto;}
table.data-grid{width:100%; border-collapse:collapse; font-size:13px;}
.data-grid thead th{
  background:var(--color-navy); color:#fff; padding:10px 8px; font-weight:600; white-space:nowrap;
  text-align:center; position:sticky; top:0;
}
.data-grid tbody td{padding:9px 8px; border-bottom:1px solid var(--color-border); text-align:center;}
.data-grid tbody td.text-left{text-align:left;}
.data-grid tbody tr:nth-child(even){background:var(--color-row-alt);}
.data-grid tbody tr:hover{background:var(--color-sidebar-hover);}
.data-grid input[type="text"], .data-grid input[type="email"], .data-grid input[type="tel"], .data-grid select{
  width:100%; border:1px solid transparent; background:transparent; padding:5px 6px; border-radius:4px; font-size:13px;
}
.data-grid input:focus, .data-grid select:focus{border-color:var(--color-primary); background:#fff; outline:none;}
.row-del{background:none; border:none; color:var(--color-text-muted); font-size:14px;}
.row-del:hover{color:var(--color-danger);}
.grid-empty{padding:40px; text-align:center; color:var(--color-text-muted); font-size:13px;}
.data-grid input.invalid{border-color:var(--color-danger) !important; background:#fff5f5;}
.avatar-cell{
  width:34px; height:34px; border-radius:50%; overflow:hidden; margin:0 auto; cursor:pointer;
  display:flex; align-items:center; justify-content:center; background:var(--color-sidebar-hover);
  border:1px solid var(--color-border);
}
.avatar-cell:hover{outline:2px solid var(--color-primary); outline-offset:1px;}
.avatar-img{width:100%; height:100%; object-fit:cover;}
.avatar-default{font-size:16px; color:var(--color-text-muted);}

/* ---------- Modal ---------- */
.modal-overlay{
  position:fixed; inset:0; background:rgba(20,24,35,.5); display:flex; align-items:center; justify-content:center; z-index:50;
}
.modal-card{background:#fff; border-radius:10px; width:520px; max-width:92vw; max-height:88vh; overflow-y:auto; box-shadow:0 20px 50px rgba(0,0,0,.3);}
.modal-header{
  background:var(--color-navy); color:#fff; padding:14px 18px; border-radius:10px 10px 0 0;
  display:flex; align-items:center; justify-content:space-between; font-size:15px; font-weight:700;
}
.modal-header .modal-close{background:none; border:none; color:#fff; font-size:16px; opacity:.8;}
.modal-body{padding:18px;}
.modal-field{margin-bottom:14px;}
.modal-field label{display:block; font-size:12.5px; font-weight:700; margin-bottom:6px;}
.modal-field input, .modal-field select, .modal-field textarea{
  width:100%; padding:9px 11px; border:1px solid var(--color-border); border-radius:6px; font-size:13.5px;
}
.modal-field textarea{resize:vertical; min-height:90px;}
.modal-row2{display:grid; grid-template-columns:1fr 1fr; gap:12px;}
.modal-footer{padding:12px 18px; border-top:1px solid var(--color-border); display:flex; justify-content:flex-end; gap:8px;}
.file-chip{display:inline-flex; align-items:center; gap:6px; background:var(--color-sidebar-hover); color:var(--color-primary-dark); padding:4px 10px; border-radius:999px; font-size:12px; margin:4px 6px 0 0;}

/* ---------- Calendar ---------- */
.cal-toolbar{display:flex; align-items:center; justify-content:space-between; background:#fff; border:1px solid var(--color-border); border-radius:8px 8px 0 0; padding:12px 16px;}
.cal-toolbar .cal-title{font-size:16px; font-weight:700;}
.cal-nav-btn{background:var(--color-navy); color:#fff; border:none; border-radius:6px; padding:6px 12px; font-size:13px;}
.cal-grid{display:grid; grid-template-columns:repeat(7,1fr); border:1px solid var(--color-border); border-top:none;}
.cal-dow{background:var(--color-navy); color:#fff; text-align:center; padding:8px 0; font-size:12px; font-weight:600;}
.cal-weeks{border:1px solid var(--color-border); border-top:none;}
.cal-week{position:relative;}
.cal-week-grid{display:grid; grid-template-columns:repeat(7,1fr);}
.cal-cell{
  min-height:96px; min-width:0; overflow:hidden; border-right:1px solid var(--color-border); border-bottom:1px solid var(--color-border);
  padding:6px; font-size:12px; vertical-align:top; cursor:pointer; background:#fff;
}
.cal-cell:hover{background:var(--color-sidebar-hover);}
.cal-cell.other-month{background:#fafbfc; color:var(--color-text-muted);}
.cal-cell .cal-date{font-weight:700; margin-bottom:4px; height:16px;}
.cal-cell.today .cal-date{color:var(--color-primary); text-decoration:underline;}
.cal-bar-spacer{width:100%;}
.cal-event{background:var(--color-primary); color:#fff; border-radius:4px; padding:2px 6px; font-size:11px; margin-bottom:2px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis;}
.cal-event.private{background:var(--color-text-muted);}
.cal-week-bars{
  position:absolute; left:0; right:0; top:26px; display:grid; grid-template-columns:repeat(7,1fr);
  row-gap:2px; pointer-events:none; z-index:2;
}
.cal-bar{
  pointer-events:auto; cursor:pointer; background:var(--color-primary); color:#fff; border-radius:4px;
  font-size:11px; height:18px; line-height:18px; padding:0 6px; margin:0 2px;
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}
.cal-bar.private{background:var(--color-text-muted);}

/* ---------- Chat ---------- */
.chat-wrap{display:flex; height:calc(100vh - var(--topbar-height) - 130px); border:1px solid var(--color-border); border-radius:8px; overflow:hidden; background:#fff;}
.chat-rooms{width:260px; border-right:1px solid var(--color-border); overflow-y:auto; flex-shrink:0;}
.chat-room-item{padding:13px 14px; border-bottom:1px solid #f0f1f4; cursor:pointer; font-size:13px;}
.chat-room-item:hover{background:var(--color-sidebar-hover);}
.chat-room-item.active{background:var(--color-sidebar-hover); font-weight:700; border-left:3px solid var(--color-primary);}
.chat-room-item .room-members{display:block; font-size:11px; color:var(--color-text-muted); font-weight:400; margin-top:2px;}
.chat-newroom{padding:10px; border-bottom:1px solid var(--color-border);}
.chat-main{flex:1; display:flex; flex-direction:column; min-width:0;}
.chat-header{padding:12px 16px; border-bottom:1px solid var(--color-border); font-weight:700; font-size:14px;}
.chat-messages{flex:1; overflow-y:auto; padding:16px; background:#f7f9fb; display:flex; flex-direction:column; gap:10px;}
.chat-bubble-row{display:flex; flex-direction:column; max-width:60%;}
.chat-bubble-row.mine{align-self:flex-end; align-items:flex-end;}
.chat-bubble-row.theirs{align-self:flex-start; align-items:flex-start;}
.chat-sender{font-size:11px; color:var(--color-text-muted); margin-bottom:3px;}
.chat-bubble{padding:9px 13px; border-radius:14px; font-size:13.5px; line-height:1.4; word-break:break-word;}
.chat-bubble-row.mine .chat-bubble{background:var(--color-primary); color:#fff; border-bottom-right-radius:3px;}
.chat-bubble-row.theirs .chat-bubble{background:#fff; border:1px solid var(--color-border); border-bottom-left-radius:3px;}
.chat-time{font-size:10px; color:var(--color-text-muted); margin-top:2px;}
.chat-input-row{display:flex; gap:8px; padding:12px; border-top:1px solid var(--color-border);}
.chat-input-row input{flex:1; padding:10px 12px; border:1px solid var(--color-border); border-radius:20px; font-size:13.5px;}
.chat-send-btn{background:var(--color-primary); color:#fff; border:none; border-radius:20px; padding:0 20px; font-size:13px; font-weight:700;}

/* ---------- Meetings detail ---------- */
.meeting-list{display:flex; flex-direction:column; gap:8px;}
.meeting-card{background:#fff; border:1px solid var(--color-border); border-radius:8px; padding:14px 16px; cursor:pointer;}
.meeting-card:hover{border-color:var(--color-primary);}
.meeting-card-title{font-size:14px; font-weight:700; margin-bottom:4px;}
.meeting-card-meta{font-size:12px; color:var(--color-text-muted); display:flex; gap:14px; flex-wrap:wrap;}

.chip-multiselect{border:1px solid var(--color-border); border-radius:6px; padding:8px; max-height:120px; overflow-y:auto;}
.chip-multiselect label{display:flex; align-items:center; gap:6px; font-size:13px; padding:4px 2px;}

.empty-state{padding:60px 20px; text-align:center; color:var(--color-text-muted); font-size:13px;}