:root{
  --bg:#f5f7fb;--surface:#fff;--surface2:#eef2f7;--text:#18202a;--muted:#687385;
  --border:#dfe4ec;--accent:#2457e6;--accent2:#173fb1;--danger:#d9363e;
  --shadow:0 18px 50px rgba(30,50,90,.12);--radius:18px
}
*{box-sizing:border-box} body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}
button,input,textarea{font:inherit} button{cursor:pointer} .hidden{display:none!important}
.auth-shell{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at 10% 10%,#e5ecff,transparent 35%),var(--bg)}
.auth-card{width:min(430px,100%);background:var(--surface);border:1px solid var(--border);border-radius:28px;padding:38px;box-shadow:var(--shadow);text-align:center}
.brand-mark{width:54px;height:54px;display:grid;place-items:center;border-radius:16px;background:var(--accent);color:#fff;font-weight:800;font-size:26px;margin:0 auto 14px}
.brand-name{font-size:24px;font-weight:800;letter-spacing:-.7px}.brand-name span{font-weight:500;color:var(--accent)}
.auth-subtitle{color:var(--muted);margin:8px 0 30px}.auth-card form{text-align:left}.auth-card label{display:block;font-size:13px;font-weight:700;margin:16px 0 7px}
input,textarea{width:100%;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:12px;padding:13px 14px;outline:none}
input:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(36,87,230,.12)}
.password-wrap{position:relative}.password-wrap input{padding-right:45px}.password-wrap .icon-btn{position:absolute;right:4px;top:4px}
.primary-btn,.secondary-btn,.compose-btn,.icon-btn,.avatar{border:0;border-radius:11px;padding:10px 14px}.primary-btn{background:var(--accent);color:#fff;font-weight:700}.primary-btn:hover{background:var(--accent2)}
.secondary-btn{background:var(--surface2);color:var(--text);font-weight:650}.full{width:100%;margin-top:24px;padding:13px}.icon-btn{background:transparent;color:var(--muted);font-size:18px}.icon-btn:hover{background:var(--surface2);color:var(--text)}
.demo-note{font-size:12px;color:var(--muted);line-height:1.5;background:var(--surface2);padding:10px;border-radius:10px;margin:18px 0}.auth-card a{font-size:13px;color:var(--accent);text-decoration:none}
.topbar{height:72px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 22px;gap:28px}.top-left{display:flex;align-items:center;gap:10px;min-width:210px}
.search{flex:1;max-width:720px;margin:auto;display:flex;align-items:center;background:var(--surface2);border-radius:14px;padding:0 14px}.search span{font-size:24px;color:var(--muted)}.search input{border:0;background:transparent;box-shadow:none}.top-actions{display:flex;align-items:center;gap:8px}.avatar{width:40px;height:40px;border-radius:50%;padding:0;background:var(--accent);color:#fff;font-weight:800}
.layout{display:flex;min-height:calc(100vh - 72px)}.sidebar{width:250px;padding:24px 15px;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column}
.compose-btn{background:var(--accent);color:#fff;padding:14px 20px;font-weight:750;font-size:15px;box-shadow:0 8px 20px rgba(36,87,230,.2);margin:0 8px 20px}
nav{display:grid;gap:4px}.nav-item{border:0;background:transparent;text-align:left;padding:11px 13px;border-radius:10px;color:var(--muted);display:flex;align-items:center;gap:12px}.nav-item:hover,.nav-item.active{background:var(--surface2);color:var(--text)}.nav-item.active{font-weight:750}.nav-item b{margin-left:auto;font-size:12px}.sidebar-bottom{margin-top:auto;border-top:1px solid var(--border);padding-top:12px}
.main{flex:1;min-width:0;padding:28px}.mail-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.mail-toolbar h1{font-size:26px;margin:0}.mail-toolbar p{color:var(--muted);margin:5px 0 0;font-size:13px}.toolbar-actions{display:flex;gap:8px}
.bulkbar{display:flex;gap:8px;align-items:center;background:var(--surface);border:1px solid var(--border);padding:8px 12px;border-radius:12px;margin-bottom:8px}.bulkbar span{margin-right:auto;color:var(--muted);font-size:13px}
.mail-list{background:var(--surface);border:1px solid var(--border);border-radius:16px;overflow:hidden}.mail-row{display:grid;grid-template-columns:34px 30px 220px 1fr auto;gap:10px;align-items:center;padding:15px 16px;border-bottom:1px solid var(--border);transition:.15s}.mail-row:last-child{border-bottom:0}.mail-row:hover{background:var(--surface2)}.mail-row.unread{font-weight:750}.mail-row.unread .preview{font-weight:500}.check{width:17px;height:17px}.star{border:0;background:transparent;font-size:22px;color:#9aa3b1;padding:0}.star.on{color:#e1a900}.sender{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.preview{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--muted)}.date{font-size:12px;color:var(--muted);white-space:nowrap}.empty-state{text-align:center;padding:80px 20px;color:var(--muted)}.empty-icon{font-size:44px}.empty-state h2{color:var(--text)}
.modal{position:fixed;inset:0;background:rgba(10,18,30,.45);display:grid;place-items:center;padding:20px;z-index:20}.modal-card{width:min(650px,100%);max-height:90vh;overflow:auto;background:var(--surface);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow);padding:22px}.compose-card{width:min(780px,100%)}.modal-header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border);padding-bottom:14px;margin-bottom:12px}.modal-header h2{margin:0;font-size:20px}.modal-header span{font-size:12px;color:var(--muted)}.compose-card form{display:grid;gap:8px}.compose-card input,.compose-card textarea{border:0;border-bottom:1px solid var(--border);border-radius:0}.compose-card textarea{min-height:300px;resize:vertical}.compose-footer{display:flex;align-items:center;gap:8px;padding-top:8px}.attach-btn{padding:9px 12px;background:var(--surface2);border-radius:10px;font-size:13px;cursor:pointer}.attachment-name{font-size:12px;color:var(--muted)}.spacer{flex:1}.message-body{white-space:pre-wrap;line-height:1.7;padding:18px 4px;min-height:180px}.message-footer{display:flex;gap:8px;border-top:1px solid var(--border);padding-top:14px}
.settings-grid{display:grid;gap:12px}.setting-card{padding:15px;background:var(--surface2);border-radius:13px}.setting-card strong{display:block;margin-bottom:5px}.setting-card span{font-size:13px;color:var(--muted)}
.toast{position:fixed;right:22px;bottom:22px;background:#18202a;color:#fff;padding:12px 16px;border-radius:10px;opacity:0;transform:translateY(12px);transition:.2s;z-index:50;pointer-events:none}.toast.show{opacity:1;transform:none}
.mobile-only{display:none}
body.dark{--bg:#11151c;--surface:#181e27;--surface2:#232b36;--text:#edf2f8;--muted:#9aa6b5;--border:#303946;--shadow:0 18px 50px rgba(0,0,0,.35)}
@media(max-width:800px){
 .topbar{padding:0 12px;gap:10px}.top-left{min-width:auto}.mobile-only{display:block}.search{order:3;position:absolute;top:80px;left:12px;right:12px;max-width:none}.layout{padding-top:58px}.sidebar{position:fixed;z-index:15;top:72px;bottom:0;left:0;transform:translateX(-105%);transition:.2s;box-shadow:var(--shadow)}.sidebar.open{transform:none}.main{padding:20px 12px}.mail-row{grid-template-columns:24px 25px 1fr auto}.sender{grid-column:3}.preview{grid-column:3}.date{grid-column:4;grid-row:1}.mail-toolbar{align-items:flex-end}.mail-toolbar h1{font-size:23px}.mail-toolbar p{display:none}.auth-card{padding:28px}.compose-footer{flex-wrap:wrap}
}