:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-alt: #f9fbff;
    --text: #13223a;
    --muted: #627287;
    --primary: #1456a0;
    --primary-dark: #0f437d;
    --success: #1f8b4c;
    --warning: #c78500;
    --danger: #c83b2d;
    --border: #d7e0ea;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Verdana, sans-serif;
    color: var(--text);
    background: radial-gradient(circle at 0 0, #e6eef9, transparent 45%), var(--bg);
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.app-shell {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background: linear-gradient(180deg, #0f2d4f 0%, #18416f 100%);
    color: #fff;
    padding: 24px 18px;
    position: sticky;
    top: 0;
    height: 100vh;
}

.brand {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 24px;
}

.nav-link {
    display: block;
    color: #d4e3f4;
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 4px;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(255, 255, 255, 0.16);
    color: #ffffff;
    text-decoration: none;
}

.main-content {
    flex: 1;
    padding: 24px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    gap: 10px;
}

.title {
    margin: 0;
    font-size: 1.5rem;
}

.user-chip {
    color: var(--muted);
    font-size: 0.95rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: 0 3px 10px rgba(17, 35, 57, 0.04);
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 12px;
}

.kpi {
    background: linear-gradient(165deg, #f6fbff 0%, #edf5ff 100%);
    border: 1px solid #d2e0f3;
    border-radius: 12px;
    padding: 14px;
}

.kpi h3 {
    margin: 0 0 8px;
    color: var(--muted);
    font-size: 0.86rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.kpi .value {
    font-size: 1.45rem;
    font-weight: 700;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 10px;
}

.form-control,
select,
input,
textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 9px 10px;
    background: #fff;
    color: var(--text);
    font-family: inherit;
}

textarea {
    min-height: 160px;
    resize: vertical;
}

label {
    display: block;
    margin-bottom: 4px;
    color: var(--muted);
    font-size: 0.88rem;
}

.btn {
    border: 0;
    border-radius: 10px;
    padding: 10px 14px;
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-light {
    background: #eaf1f8;
    color: #234;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-warning {
    background: var(--warning);
    color: #fff;
}

.btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.table-wrap {
    overflow: auto;
    border: 1px solid var(--border);
    border-radius: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 860px;
}

th,
td {
    border-bottom: 1px solid var(--border);
    padding: 8px 10px;
    text-align: left;
    vertical-align: top;
    font-size: 0.92rem;
}

th {
    background: #edf4fc;
    color: #28415e;
    position: sticky;
    top: 0;
    z-index: 1;
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
}

.badge.closed {
    background: #e2f7ea;
    color: #16633a;
}

.badge.pending {
    background: #fff1d8;
    color: #8f6200;
}

.badge.open {
    background: #fee2dd;
    color: #992f21;
}

.alert {
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 12px;
}

.alert-success {
    background: #def3e5;
    color: #1e6b3d;
    border: 1px solid #b9e4c9;
}

.alert-error {
    background: #fde2df;
    color: #8f2d23;
    border: 1px solid #f6c2bc;
}

.pager {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.small {
    color: var(--muted);
    font-size: 0.86rem;
}

.login-wrap {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
    background: radial-gradient(circle at 10% 20%, #e6f0fd, transparent 35%), linear-gradient(145deg, #f4f8ff, #e9f0fb);
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 18px 36px rgba(14, 42, 74, 0.12);
}

.chart-box {
    height: 320px;
}

@media (max-width: 1100px) {
    .sidebar {
        width: 220px;
    }

    .grid-3 {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 900px) {
    .app-shell {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: static;
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .main-content {
        padding: 16px;
    }
}