:root {
    --bg: #f3f5f8;
    --panel: #ffffff;
    --line: #e4e8ef;
    --text: #1c2430;
    --muted: #6b7687;
    --accent: #0f6e56;
    --accent-soft: #e7f5f0;
    --danger: #c0392b;
    --warn: #b7791f;
    --ok: #1f7a4d;
    --sidebar: #12263a;
    --sidebar-text: #c9d4e0;
    --radius: 10px;
    --shadow: 0 8px 24px rgba(18, 38, 58, 0.06);
    --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: var(--font);
    background: linear-gradient(160deg, #eef2f6 0%, #f7f8fb 45%, #e9eef5 100%);
    color: var(--text);
    min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 220px;
    background: linear-gradient(180deg, #0f2032, #163049);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}
.brand {
    padding: 22px 20px;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.5px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sidebar nav { padding: 14px 10px; flex: 1; }
.sidebar nav a {
    display: block;
    color: var(--sidebar-text);
    padding: 10px 14px;
    border-radius: 8px;
    margin-bottom: 4px;
    text-decoration: none;
}
.sidebar nav a:hover,
.sidebar nav a.active {
    background: rgba(255,255,255,0.08);
    color: #fff;
}
.sidebar-foot {
    padding: 16px 20px 22px;
    border-top: 1px solid rgba(255,255,255,0.08);
}
.sidebar-foot .user { color: #fff; margin-bottom: 8px; font-size: 14px; }
.logout { color: #9eb0c3; font-size: 13px; }

.main { flex: 1; padding: 0 0 40px; min-width: 0; }
.topbar {
    padding: 22px 28px 8px;
}
.topbar h1 {
    margin: 0;
    font-size: 22px;
    font-weight: 650;
}
.content { padding: 12px 28px 0; }

.alert {
    margin: 0 28px 12px;
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 14px;
}
.alert-success { background: #eaf7ef; color: var(--ok); }
.alert-error { background: #fdeeee; color: var(--danger); }
.alert-info { background: var(--accent-soft); color: var(--accent); }

.card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px 20px;
    margin-bottom: 16px;
}
.card h2 {
    margin: 0 0 14px;
    font-size: 16px;
}

.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-bottom: 16px;
}
.stat {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: var(--shadow);
}
.stat .label { color: var(--muted); font-size: 13px; }
.stat .value { font-size: 28px; font-weight: 700; margin-top: 8px; }

.toolbar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 14px;
}
.toolbar .spacer { flex: 1; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: none;
    border-radius: 8px;
    padding: 8px 14px;
    font-size: 14px;
    cursor: pointer;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
}
.btn:hover { filter: brightness(1.05); text-decoration: none; }
.btn-secondary { background: #445366; }
.btn-danger { background: var(--danger); }
.btn-ghost {
    background: #fff;
    color: var(--text);
    border: 1px solid var(--line);
}
.btn-sm { padding: 5px 10px; font-size: 12px; }

.table-wrap { overflow-x: auto; }
table.data {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
table.data th,
table.data td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
}
table.data th {
    color: var(--muted);
    font-weight: 600;
    background: #fafbfc;
}
table.data tr:hover td { background: #fafcfd; }

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 12px;
    line-height: 1.6;
}
.badge-ok { background: #eaf7ef; color: var(--ok); }
.badge-warn { background: #fff6e5; color: var(--warn); }
.badge-muted { background: #eef1f5; color: var(--muted); }
.badge-danger { background: #fdeeee; color: var(--danger); }

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px 18px;
}
.form-grid .full { grid-column: 1 / -1; }
label.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 13px;
    color: var(--muted);
}
input[type="text"],
input[type="password"],
input[type="number"],
input[type="datetime-local"],
select,
textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 9px 11px;
    font: inherit;
    color: var(--text);
    background: #fff;
}
textarea { min-height: 140px; resize: vertical; }
.form-actions {
    margin-top: 18px;
    display: flex;
    gap: 10px;
}
.muted { color: var(--muted); font-size: 13px; }
.mono { font-family: Consolas, "Courier New", monospace; }

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background:
        radial-gradient(circle at 20% 20%, rgba(15,110,86,.12), transparent 40%),
        radial-gradient(circle at 80% 10%, rgba(18,38,58,.10), transparent 35%),
        linear-gradient(160deg, #eef2f6, #f8fafc);
}
.login-box {
    width: 100%;
    max-width: 400px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
    padding: 28px;
}
.login-box h1 {
    margin: 0 0 6px;
    font-size: 22px;
}
.login-box .sub {
    color: var(--muted);
    margin-bottom: 22px;
    font-size: 14px;
}
.login-box .field { margin-bottom: 14px; }
.login-box .btn { width: 100%; padding: 11px; }

.pager {
    display: flex;
    gap: 8px;
    margin-top: 14px;
    align-items: center;
}
.pager a, .pager span {
    padding: 5px 10px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fff;
    color: var(--text);
    font-size: 13px;
}
.pager .current { background: var(--accent); color: #fff; border-color: var(--accent); }

@media (max-width: 960px) {
    .stats { grid-template-columns: 1fr 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    .sidebar { width: 180px; }
}
@media (max-width: 720px) {
    .layout { flex-direction: column; }
    .sidebar { width: 100%; height: auto; position: relative; }
    .sidebar nav { display: flex; flex-wrap: wrap; gap: 4px; }
    .stats { grid-template-columns: 1fr; }
    .content, .topbar, .alert { margin-left: 0; padding-left: 16px; padding-right: 16px; }
}