:root {
    color-scheme: light;
    --bg: #f4f7f9;
    --surface: #ffffff;
    --text: #1f2933;
    --muted: #5f6c7b;
    --border: #d7dee5;
    --primary: #0f766e;
    --primary-hover: #115e59;
    --danger-bg: #fff1f2;
    --danger-text: #be123c;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a {
    color: var(--primary);
}

.page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.shell {
    width: min(100%, 420px);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 28px;
    box-shadow: 0 18px 45px rgba(31, 41, 51, 0.08);
}

.dashboard {
    width: min(100%, 920px);
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
}

h1 {
    margin: 0 0 8px;
    font-size: 28px;
    line-height: 1.2;
}

p {
    color: var(--muted);
    line-height: 1.5;
}

.field {
    display: grid;
    gap: 8px;
    margin-bottom: 16px;
}

label {
    font-weight: 700;
}

input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 12px;
    font-size: 16px;
}

select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #ffffff;
    padding: 12px;
    font-size: 16px;
}

button {
    border: 0;
    border-radius: 6px;
    background: var(--primary);
    color: #ffffff;
    cursor: pointer;
    font-weight: 700;
    padding: 12px 16px;
}

button:hover {
    background: var(--primary-hover);
}

.button-link {
    background: transparent;
    color: var(--primary);
    padding: 0;
}

.alert {
    margin-bottom: 16px;
    border-radius: 6px;
    background: var(--danger-bg);
    color: var(--danger-text);
    padding: 12px;
}

.meta {
    display: grid;
    gap: 10px;
    margin-top: 20px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
}

.admin-shell {
    width: min(100%, 1180px);
    min-height: 680px;
    display: grid;
    grid-template-columns: 240px 1fr;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 18px 45px rgba(31, 41, 51, 0.08);
}

.sidebar {
    background: #1f2933;
    color: #ffffff;
    padding: 24px;
}

.brand {
    display: grid;
    gap: 6px;
    margin-bottom: 32px;
}

.brand span {
    color: #cbd5e1;
    font-size: 14px;
}

.nav-list {
    display: grid;
    gap: 8px;
}

.nav-item {
    border-radius: 6px;
    color: #dbeafe;
    padding: 11px 12px;
    text-decoration: none;
}

.nav-item.active,
.nav-item:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
}

.admin-main {
    padding: 28px;
}

.admin-header,
.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
}

.button-secondary {
    background: #334155;
}

.button-secondary:hover {
    background: #1e293b;
}

.button-primary,
.button-outline {
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    min-height: 42px;
    padding: 0 16px;
    text-decoration: none;
}

.button-primary {
    background: var(--primary);
    color: #ffffff;
}

.button-outline {
    border: 1px solid var(--border);
    color: var(--text);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 18px;
}

.stat-card span {
    color: var(--muted);
}

.stat-card strong {
    display: block;
    font-size: 34px;
    margin-top: 8px;
}

.panel {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 18px;
}

.form-panel {
    max-width: 620px;
}

.success {
    background: #ecfdf5;
    color: #047857;
}

.panel h2 {
    margin: 0;
    font-size: 20px;
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    border-top: 1px solid var(--border);
    padding: 12px 10px;
    text-align: left;
    white-space: nowrap;
}

th {
    color: var(--muted);
    font-size: 13px;
}

@media (max-width: 760px) {
    .admin-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        padding: 18px;
    }

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

    .admin-header,
    .panel-header {
        align-items: flex-start;
        flex-direction: column;
    }
}