* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, sans-serif; background: #f4f7fb; color: #222; }
a { text-decoration: none; }
.layout { display: flex; min-height: 100vh; }
.sidebar { width: 250px; background: #10182a; color: #fff; padding: 24px 18px; }
.brand { font-size: 30px; font-weight: 700; margin-bottom: 24px; }
.brand span { color: #2f86ff; }
.brand.large { font-size: 42px; }
.userbox { padding: 14px; background: rgba(255,255,255,0.08); border-radius: 12px; margin-bottom: 18px; }
.nav { display: flex; flex-direction: column; gap: 8px; }
.nav-link { color: #fff; padding: 12px 14px; border-radius: 10px; display: block; }
.nav-link:hover, .nav-link.active { background: #2f86ff; }
.content { flex: 1; padding: 24px; }
.page-head h1 { margin: 0 0 18px; }
.grid { display: grid; gap: 20px; }
.grid.stats { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid.two { grid-template-columns: repeat(2, minmax(0,1fr)); }
.large-gap { gap: 24px; }
.card { background: #fff; border-radius: 16px; padding: 18px; box-shadow: 0 6px 18px rgba(20,30,60,0.08); }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 14px; }
.card-head h2 { margin: 0; font-size: 22px; }
.stat { text-align: center; }
.stat-number { font-size: 34px; font-weight: 700; color: #2f86ff; margin-bottom: 10px; }
.btn { background: #edf3ff; color: #18418e; border: 0; border-radius: 10px; padding: 10px 14px; cursor: pointer; display: inline-block; }
.btn.primary { background: #2f86ff; color: #fff; }
.btn.danger { background: #d9534f; color: #fff; }
.btn.small { padding: 8px 10px; font-size: 13px; }
.btn.full { width: 100%; }
.badge { display: inline-block; min-width: 20px; text-align: center; padding: 2px 7px; background: #d9534f; color: #fff; border-radius: 999px; margin-left: 6px; font-size: 12px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px; border-bottom: 1px solid #e6e9ef; text-align: left; vertical-align: top; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
label { display: block; font-weight: 700; margin-bottom: 6px; }
input, select, textarea { width: 100%; padding: 11px 12px; border: 1px solid #d7deea; border-radius: 10px; font: inherit; }
textarea { min-height: 110px; resize: vertical; }
.actions-row { display: flex; gap: 10px; }
.inline-form { display: inline-flex; gap: 8px; align-items: center; }
.search-form { margin-bottom: 14px; display: flex; }
.search-form input { flex: 1; }
.flash { padding: 12px 14px; border-radius: 10px; margin-bottom: 16px; }
.flash.success { background: #e7f7ea; color: #1f6a2a; }
.flash.error { background: #fdeaea; color: #8e2020; }
.message-list { display: flex; flex-direction: column; gap: 12px; }
.message-item { padding: 14px; border: 1px solid #e6e9ef; border-radius: 12px; background: #fafcff; }
.message-item.unread { border-color: #2f86ff; background: #eef5ff; }
.message-top, .message-meta { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.message-meta { color: #667; font-size: 14px; margin: 6px 0 10px; }
.actions-cell { display: flex; flex-wrap: wrap; gap: 8px; }
.checkboxes { display: flex; flex-wrap: wrap; gap: 14px; }
.login-body { min-height: 100vh; display: grid; place-items: center; background: linear-gradient(135deg, #132241, #264d96); }
.login-card { width: min(460px, 92vw); background: #fff; border-radius: 20px; padding: 28px; box-shadow: 0 12px 40px rgba(10,20,40,0.25); }
.login-card p { color: #566; }
.hint { margin-top: 16px; padding: 12px; border-radius: 12px; background: #f5f7fb; }
@media (max-width: 900px) {
  .layout { display: block; }
  .sidebar { width: 100%; }
  .grid.stats, .grid.two, .form-grid { grid-template-columns: 1fr; }
}