/* UTF-8 */
:root {
    --bg: #ffffff;
    --panel: #ffffff;
    --muted: #475569;
    --text: #0f172a;
    --accent: #16a34a;
    --accent-2: #2563eb;
    --danger: #dc2626;
    --border: #e5e7eb
}

* {
    box-sizing: border-box
}

html,
body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.5 system-ui, Segoe UI, Roboto, Arial
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px
}

.row {
    display: flex;
    gap: 12px
}

.center {
    align-items: center
}

.space-between {
    justify-content: space-between
}

.topbar {
    border-bottom: 1px solid var(--border);
    background: linear-gradient(90deg, #ffffff, #f8fafc)
}

.brand {
    color: var(--text);
    text-decoration: none;
    font-weight: 700
}

.nav a {
    color: var(--muted);
    text-decoration: none;
    margin-left: 16px
}

.nav a:hover {
    color: var(--text)
}

.nav a.muted {
    opacity: .8
}

.footer {
    border-top: 1px solid var(--border);
    padding: 16px 0;
    margin-top: 40px;
    color: #64748b
}

.layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 16px
}

.sidebar {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px
}

.sidebar ul {
    list-style: none;
    margin: 0;
    padding: 0
}

.sidebar a {
    display: block;
    padding: 8px 10px;
    color: #334155;
    text-decoration: none;
    border-radius: 6px
}

.sidebar a:hover {
    background: #f1f5f9;
    color: #0f172a
}

.sidebar a.active {
    background: #dbeafe;
    color: #0f172a
}

.content {
    min-height: 60vh
}

h1,
h2,
h3 {
    margin: 16px 0
}

.table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0
}

.table th,
.table td {
    border-bottom: 1px solid var(--border);
    padding: 10px 8px;
    text-align: left
}

.table th {
    color: #475569;
    font-weight: 600;
    background: #f8fafc
}

.table tr:nth-child(odd) {
    background: #fafafa
}

.table tr.overdue {
    background: #fff1f2
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 12px;
    border: 1px solid var(--border);
    background: #f8fafc;
    color: #0f172a
}

.badge.gray {
    background: #f1f5f9
}

.badge.slate {
    background: #e2e8f0
}

.badge.blue {
    background: #dbeafe
}

.badge.indigo {
    background: #e0e7ff
}

.badge.violet {
    background: #ede9fe
}

.badge.amber {
    background: #fef3c7
}

.badge.emerald {
    background: #d1fae5
}

.badge.orange {
    background: #ffedd5
}

.badge.cyan {
    background: #cffafe
}

.badge.sky {
    background: #e0f2fe
}

.badge.teal {
    background: #ccfbf1
}

.badge.green {
    background: #dcfce7
}

form label {
    display: block;
    margin: 10px 0 6px
}

input[type=text],
input[type=email],
input[type=password],
input[type=number],
textarea,
select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #ffffff;
    color: var(--text)
}

textarea {
    min-height: 120px
}

button,
.btn {
    display: inline-block;
    padding: 8px 12px;
    border: 0;
    border-radius: 6px;
    background: var(--accent-2);
    color: #fff;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px
}

button:hover,
.btn:hover {
    filter: brightness(1.05)
}

.btn.secondary {
    background: var(--accent)
}

.btn.danger {
    background: var(--danger)
}

.btn-sm {
    padding: 6px 10px;
    font-size: 13px;
    border-radius: 5px
}

.flash-list {
    list-style: none;
    padding: 0;
    margin: 16px 0
}

.flash {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #f8fafc
}

.flash.success {
    border-color: #bbf7d0;
    background: #f0fdf4
}

.flash.error {
    border-color: #fecaca;
    background: #fef2f2
}

.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin: 16px 0
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px
}

@media (max-width:960px) {
    .layout {
        grid-template-columns: 1fr
    }

    .sidebar {
        display: none
    }
}

@media (max-width:720px) {
    .grid {
        grid-template-columns: 1fr
    }
}