:root{
  --primary:#1f4e79;
  --primary-2:#2f6da3;
  --bg:#f5f7fb;
  --card:#ffffff;
  --text:#1f2937;
  --muted:#6b7280;
  --border:#dbe3ef;
  --success:#0f766e;
  --danger:#b42318;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}
a{color:var(--primary-2);text-decoration:none}
a:hover{text-decoration:underline}

.app-shell{display:flex;min-height:100vh}
.sidebar{
  width:260px;background:var(--primary);color:#fff;padding:20px 16px;flex-shrink:0;
}
.sidebar h1{font-size:20px;margin:0 0 4px}
.sidebar .sub{font-size:13px;opacity:.85;margin-bottom:18px}
.nav a{
  display:block;color:#fff;padding:10px 12px;border-radius:10px;margin-bottom:6px;
}
.nav a:hover,.nav a.active{background:rgba(255,255,255,.14);text-decoration:none}
.content{flex:1;padding:24px}
.topbar{
  display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px;
}
.card{
  background:var(--card);border:1px solid var(--border);border-radius:16px;
  padding:18px;box-shadow:0 2px 10px rgba(0,0,0,.03);
}
.grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.stat .label{font-size:13px;color:var(--muted);margin-bottom:6px}
.stat .value{font-size:28px;font-weight:bold}
.btn{
  display:inline-block;border:none;border-radius:10px;padding:10px 14px;cursor:pointer;
  background:var(--primary);color:#fff;font-weight:600;
}
.btn.secondary{background:#eef4fb;color:var(--primary)}
.btn.danger{background:var(--danger)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-group{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
label{font-weight:600;font-size:14px}
input,textarea,select{
  width:100%;padding:12px;border:1px solid var(--border);border-radius:10px;background:#fff;
}
textarea{min-height:110px;resize:vertical}
.full{grid-column:1 / -1}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:12px 10px;border-bottom:1px solid var(--border);text-align:left;vertical-align:middle}
th{font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}
.flash{padding:12px 14px;border-radius:10px;margin-bottom:16px}
.flash.success{background:#ecfdf3;color:var(--success);border:1px solid #ccefd8}
.flash.error{background:#fef3f2;color:var(--danger);border:1px solid #f6d1ce}
.auth-wrap{max-width:980px;margin:40px auto;display:grid;grid-template-columns:1.1fr .9fr;gap:20px}
.hero{padding:28px;border-radius:20px;background:linear-gradient(135deg,#1f4e79,#2f6da3);color:#fff}
.hero h2{margin-top:0;font-size:30px}
.hero ul{padding-left:18px}
.small{font-size:13px;color:var(--muted)}
.badge{display:inline-block;padding:6px 10px;border-radius:999px;background:#eef4fb;color:var(--primary);font-size:12px;font-weight:700}

@media (max-width: 900px){
  .app-shell{display:block}
  .sidebar{width:100%}
  .content{padding:16px}
  .grid{grid-template-columns:1fr 1fr}
  .auth-wrap{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
}

@media (max-width: 600px){
  .grid{grid-template-columns:1fr}
}


.checkbox-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:10px;
}
.check-pill{
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:12px;
  background:#fff;
}
.check-pill input{width:auto}
@media (max-width: 900px){
  .checkbox-grid{grid-template-columns:1fr 1fr}
}
@media (max-width: 600px){
  .checkbox-grid{grid-template-columns:1fr}
}

a{word-break:break-word}
.guest-shell{display:block}
.content-full{max-width:1200px;margin:0 auto}
.breadcrumbs span{color:var(--muted)}
.channel-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.channel-chip{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:#fff;color:var(--text);text-decoration:none}
.channel-chip:hover{text-decoration:none;border-color:#bcd0e5;box-shadow:0 2px 10px rgba(0,0,0,.04)}
.rich-editor{min-height:260px;padding:12px;border:1px solid var(--border);border-radius:12px;background:#fff}
.markdown-preview{min-height:180px;border:1px dashed var(--border);border-radius:12px;padding:12px;background:#fcfdff}
.member-picker{max-height:320px;overflow:auto;padding-right:4px}
@media (max-width: 900px){.channel-list{grid-template-columns:1fr}}
.nav-group{margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid rgba(255,255,255,.12)}
.nav-group-title{font-size:11px;letter-spacing:.12em;text-transform:uppercase;opacity:.7;margin:0 0 8px 12px}
.calendar-tabs{display:flex;gap:10px;flex-wrap:wrap}
.tab-pill{display:inline-flex;align-items:center;padding:9px 14px;border-radius:999px;background:#eef4fb;color:var(--primary);font-weight:600}
.tab-pill.active{background:var(--primary);color:#fff}
.tab-pill:hover{text-decoration:none}
.calendar-grid{display:grid;gap:12px}
.month-grid{grid-template-columns:repeat(7,minmax(0,1fr))}
.week-grid{grid-template-columns:repeat(7,minmax(0,1fr))}
.year-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
.calendar-cell{min-height:120px;padding:12px;border:1px solid var(--border);border-radius:12px;background:#fff}
.muted-cell{opacity:.55;background:#f8fafc}
@media (max-width: 1100px){.month-grid,.week-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.year-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width: 700px){.month-grid,.week-grid,.year-grid{grid-template-columns:1fr}}
.menu-toggle{display:none;background:#eef4fb;border:none;border-radius:10px;padding:10px;cursor:pointer}
.menu-toggle span{display:block;width:20px;height:2px;background:var(--primary);margin:4px 0}
.sidebar-overlay{display:none}
@media (max-width: 900px){
  .menu-toggle{display:inline-block}
  .sidebar{position:fixed;left:-280px;top:0;height:100vh;z-index:1000;transition:left .2s ease;overflow:auto}
  .sidebar.sidebar-open{left:0}
  .sidebar-overlay{display:block;position:fixed;inset:0;background:rgba(0,0,0,.28);opacity:0;pointer-events:none;transition:opacity .2s ease;z-index:999}
  .sidebar-overlay.show{opacity:1;pointer-events:auto}
}

body.menu-open{overflow:hidden}
@media (max-width: 900px){
  .sidebar{width:280px !important;max-width:84vw;left:-300px !important;box-shadow:0 10px 30px rgba(0,0,0,.24)}
  .sidebar.sidebar-open{left:0 !important}
}

/* v9 mobile nav + professional editor */
.menu-toggle{display:none;align-items:center;justify-content:center;width:44px;height:44px;font-size:24px;line-height:1;background:#eef4fb;color:var(--primary);border:none;border-radius:12px;padding:0;cursor:pointer}
body.menu-open{overflow:hidden}
.rtx-shell{border:1px solid var(--border);border-radius:16px;background:#fff;overflow:hidden}
.rtx-topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 12px;background:#f8fbff;border-bottom:1px solid var(--border);flex-wrap:wrap}
.rtx-tabs{display:flex;gap:8px;flex-wrap:wrap}
.rtx-tab,.rtx-tool{border:1px solid var(--border);background:#fff;color:var(--text);border-radius:10px;padding:8px 10px;cursor:pointer;font-size:13px}
.rtx-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.rtx-toolbar{display:flex;gap:8px;flex-wrap:wrap}
.rtx-pane{display:none}
.rtx-pane.active{display:block}
.rtx-rich{min-height:260px;padding:14px;outline:none}
.rtx-code{width:100%;min-height:220px;border:none;border-radius:0;padding:14px;font-family:Menlo,Monaco,monospace;background:#fbfdff}
.rtx-pane-html.active,.rtx-pane-markdown.active{display:grid;grid-template-columns:1fr 1fr}
.rtx-preview,.rtx-preview-standalone{min-height:220px;padding:14px;border-left:1px solid var(--border);background:#fcfdff;overflow:auto}
.rtx-pane-preview .rtx-preview-standalone{border-left:none}
@media (max-width: 900px){
  .menu-toggle{display:flex !important}
  .sidebar{position:fixed !important;top:0;left:0;width:280px !important;max-width:84vw;height:100vh;transform:translateX(-105%);transition:transform .22s ease;z-index:1100;overflow:auto;box-shadow:0 10px 30px rgba(0,0,0,.24)}
  .sidebar.sidebar-open{transform:translateX(0)}
  .sidebar-overlay{display:block;position:fixed;inset:0;background:rgba(0,0,0,.28);opacity:0;pointer-events:none;transition:opacity .2s ease;z-index:1090}
  .sidebar-overlay.show{opacity:1;pointer-events:auto}
}
@media (max-width: 700px){
  .rtx-pane-html.active,.rtx-pane-markdown.active{grid-template-columns:1fr}
  .rtx-preview,.rtx-preview-standalone{border-left:none;border-top:1px solid var(--border)}
}