:root {
  --bg: #000;
  --surface: #0d0d0d;
  --surface2: #1a1a1a;
  --border: #2a2a2a;
  --text: #e0e0e0;
  --dim: #606060;
  --accent: #4a9eff;
  --danger: #e05555;
  --unread: #0d1a2e;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; background: var(--bg); color: var(--text); font-family: system-ui, -apple-system, sans-serif; font-size: 14px; line-height: 1.5; }
body { display: flex; flex-direction: row; }
.sidebar { width: 220px; min-width: 220px; background: var(--surface); border-right: 1px solid var(--border); display: flex; flex-direction: column; padding: 16px 0; overflow-y: auto; }
.sidebar-user { padding: 0 16px 16px; color: var(--dim); font-size: 12px; border-bottom: 1px solid var(--border); word-break: break-all; }
.sidebar-nav { flex: 1; padding: 8px 0; }
.sidebar-link { display: block; padding: 8px 16px; color: var(--text); text-decoration: none; font-size: 13px; }
.sidebar-link:hover { background: var(--surface2); }
.sidebar-actions { padding: 16px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 8px; }
main { flex: 1; overflow-y: auto; padding: 24px; }
.btn { display: inline-block; padding: 6px 14px; background: var(--surface2); color: var(--text); border: 1px solid var(--border); border-radius: 4px; cursor: pointer; text-decoration: none; font-size: 13px; font-family: inherit; line-height: 1.4; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary { background: var(--accent); color: #000; border-color: var(--accent); }
.btn-primary:hover { opacity: 0.85; color: #000; }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { opacity: 0.85; color: #fff; }
.btn-full { width: 100%; text-align: center; }
.btn-sm { padding: 3px 8px; font-size: 12px; }
.login-body { justify-content: center; align-items: center; height: 100vh; background: var(--bg); }
.login-box { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 32px; width: 360px; }
.login-box h1 { margin-bottom: 4px; font-size: 24px; }
.login-domain { color: var(--dim); font-size: 13px; margin-bottom: 24px; }
.login-error { color: var(--danger); margin-bottom: 12px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; color: var(--dim); font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; }
.form-group input, .form-group textarea { width: 100%; padding: 8px 12px; background: var(--surface2); border: 1px solid var(--border); border-radius: 4px; color: var(--text); font-family: inherit; font-size: 14px; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--accent); }
.form-group textarea { resize: vertical; }
.folder-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.search-form { display: flex; gap: 8px; }
.search-form input { padding: 6px 12px; background: var(--surface2); border: 1px solid var(--border); border-radius: 4px; color: var(--text); font-family: inherit; font-size: 13px; }
.msg-table { width: 100%; border-collapse: collapse; }
.msg-table th { text-align: left; padding: 8px 12px; color: var(--dim); font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; border-bottom: 1px solid var(--border); }
.msg-row { height: 36px; cursor: pointer; border-bottom: 1px solid var(--border); }
.msg-row:hover { background: var(--surface2); }
.msg-unread { background: var(--unread); font-weight: 600; }
.msg-unread:hover { background: #0f2040; }
.msg-table td { padding: 0 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-from { max-width: 200px; }
.msg-subject { max-width: 400px; }
.msg-date { color: var(--dim); font-size: 12px; white-space: nowrap; }
.msg-size { color: var(--dim); font-size: 12px; text-align: right; }
.msg-empty { padding: 24px 12px; color: var(--dim); text-align: center; }
.pagination { display: flex; align-items: center; gap: 12px; margin-top: 16px; color: var(--dim); }
.msg-view { max-width: 860px; }
.msg-view-header { padding-bottom: 16px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.msg-view-subject { font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.msg-view-meta { display: flex; flex-direction: column; gap: 4px; color: var(--dim); font-size: 13px; margin-bottom: 12px; }
.msg-view-meta span strong { color: var(--text); }
.msg-view-actions { display: flex; gap: 8px; }
.msg-iframe { width: 100%; min-height: 400px; border: none; background: #fff; border-radius: 4px; }
.msg-text { font-family: monospace; font-size: 13px; line-height: 1.6; white-space: pre-wrap; word-break: break-word; }
.compose { max-width: 700px; }
.compose h2 { margin-bottom: 20px; }
.form-actions { display: flex; gap: 8px; margin-top: 8px; }
.contacts { max-width: 700px; }
.contacts h2 { margin-bottom: 20px; }
.contacts-table { width: 100%; border-collapse: collapse; margin-bottom: 32px; }
.contacts-table th { text-align: left; padding: 8px 12px; color: var(--dim); font-size: 12px; text-transform: uppercase; border-bottom: 1px solid var(--border); }
.contacts-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
.contacts-table a { color: var(--accent); text-decoration: none; }
.contact-add h3 { margin-bottom: 16px; }