:root {
    --bg: #f2f5f9;
    --surface: #ffffff;
    --text: #152135;
    --muted: #6b7c93;
    --primary: #1f6feb;
    --border: #dde5f0;
    --danger: #cc3344;
    --radius: 12px;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", "PingFang SC", sans-serif;
    color: var(--text);
    background: radial-gradient(circle at top left, #ffffff 0, #eef4ff 45%, #f3f7fb 100%);
}

a { color: var(--primary); text-decoration: none; }
h1 { margin: 0 0 16px; font-size: 26px; }
h3 { margin: 0 0 12px; font-size: 17px; }
.muted { color: var(--muted); font-size: 13px; }

.app-shell { display: flex; min-height: 100vh; }
.sidebar {
    width: 230px;
    padding: 22px 16px;
    border-right: 1px solid var(--border);
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(6px);
}
.brand { font-size: 21px; font-weight: 700; margin-bottom: 18px; color: #0c4ca3; }
.menu { display: grid; gap: 10px; }
.menu a {
    background: #f1f6ff;
    border: 1px solid #d8e7ff;
    color: #0d4eaa;
    padding: 10px 12px;
    border-radius: 10px;
}

.main { flex: 1; display: flex; flex-direction: column; }
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    background: rgba(255,255,255,.86);
}
.content { padding: 20px; display: grid; gap: 16px; }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: 0 8px 22px rgba(20,50,90,0.05);
}
.card-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.card-grid.two { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.stat strong { font-size: 26px; color: #0f4fa8; margin-top: 8px; display: block; }

.btn {
    border: none;
    background: var(--primary);
    color: #fff;
    padding: 10px 14px;
    border-radius: 9px;
    cursor: pointer;
    font-weight: 600;
}
.btn-light {
    background: #eff5ff;
    color: #2459a8;
    border: 1px solid #cfdef7;
}

.row-between { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.filter-row { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); align-items: center; }
.form-grid { display: grid; gap: 10px; }
input, select, textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 11px;
    background: #fff;
}

table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid #e9eef5; text-align: left; padding: 10px; font-size: 14px; }
th { color: var(--muted); font-weight: 600; }
.table-wrap { overflow-x: auto; }

.badge {
    display: inline-block;
    background: #e8f0ff;
    border: 1px solid #c9dcff;
    color: #1f5ebc;
    border-radius: 999px;
    padding: 2px 9px;
    font-size: 12px;
}

.alert { border-radius: 10px; padding: 10px; }
.alert-error { background: #fff1f3; border: 1px solid #ffcfd6; color: var(--danger); }
.alert-success { background: #ecfff3; border: 1px solid #bde7cc; color: #147a3a; }
.err { color: var(--danger); }
.btn-danger { background: #d33a48; color: #fff; }
.inline-form { margin-top: 8px; }

.guest-body {
    display: grid;
    min-height: 100vh;
    place-items: center;
}
.guest-wrap { width: min(420px, 92vw); }
.auth-card h1 { margin-bottom: 6px; }

@media (max-width: 900px) {
    .app-shell { display: block; }
    .sidebar {
        width: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .menu {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}