:root {
    --page-bg: #f5f7fb;
    --surface: #ffffff;
    --surface-soft: #f8fafc;
    --border: #dbe3ee;
    --text: #172033;
    --muted: #667085;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --info: #0891b2;
    --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    background: var(--page-bg);
    color: var(--text);
    font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
    font-size: 15px;
}

.container {
    max-width: 1280px;
}

.navbar {
    background: #111827 !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.16);
    padding: 14px 0;
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: 0;
}

.navbar-dark .navbar-nav .nav-link {
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.72);
    font-weight: 600;
    margin-left: 6px;
    padding: 9px 13px;
}

.navbar-dark .navbar-nav .active > .nav-link,
.navbar-dark .navbar-nav .nav-link:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
}

h1 {
    color: var(--text);
    font-size: 30px;
    font-weight: 800;
    letter-spacing: 0;
    margin-bottom: 22px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.card-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 18px 20px;
}

.card-header h5 {
    color: var(--text);
    font-size: 17px;
    font-weight: 800;
    margin: 0;
}

.card-body {
    padding: 20px;
}

.stat-card {
    background: var(--surface) !important;
    border: 1px solid var(--border);
    border-left: 5px solid var(--primary);
    color: var(--text) !important;
    min-height: 126px;
}

.stat-card.bg-success {
    border-left-color: var(--success);
}

.stat-card.bg-warning {
    border-left-color: var(--warning);
}

.stat-card.bg-danger {
    border-left-color: var(--danger);
}

.stat-card.bg-info {
    border-left-color: var(--info);
}

.stat-card .card-body {
    justify-content: space-between;
    padding: 22px;
}

.stat-icon {
    align-items: center;
    background: var(--surface-soft);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--primary);
    display: flex;
    font-size: 28px !important;
    height: 54px;
    justify-content: center;
    margin-right: 18px;
    width: 54px;
}

.bg-success .stat-icon {
    color: var(--success);
}

.bg-warning .stat-icon {
    color: var(--warning);
}

.bg-danger .stat-icon {
    color: var(--danger);
}

.bg-info .stat-icon {
    color: var(--info);
}

.stat-info h3 {
    color: var(--text);
    font-size: 32px;
    font-weight: 800;
    line-height: 1;
    margin: 0 0 8px;
}

.stat-info p {
    color: var(--muted) !important;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0;
}

.table {
    color: var(--text);
    margin-bottom: 0;
}

.table thead th {
    background: var(--surface-soft);
    border-bottom: 1px solid var(--border);
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0;
    padding: 13px 14px;
    white-space: nowrap;
}

.table td {
    border-top: 1px solid #edf1f7;
    padding: 13px 14px;
    vertical-align: middle;
}

.table-striped tbody tr:nth-of-type(odd) {
    background: #fbfdff;
}

.badge {
    border-radius: 8px;
    font-size: 12px;
    font-weight: 800;
    padding: 7px 9px;
}

.btn {
    border-radius: 8px;
    font-weight: 700;
    letter-spacing: 0;
}

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

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

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

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

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

.form-control,
select.form-control {
    border: 1px solid var(--border);
    border-radius: 8px;
    min-height: 42px;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
}

.alert {
    border-radius: 8px;
    border-width: 1px;
}

.modal-content {
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.modal-header {
    border-bottom: 1px solid var(--border);
}

.login-page,
.register-page {
    align-items: center;
    display: flex;
    min-height: 100vh;
    padding: 32px 16px;
}

.login-container,
.register-container {
    margin: 0 auto;
    max-width: 460px;
    width: 100%;
}

.login-container .card,
.register-container .card {
    box-shadow: 0 24px 56px rgba(15, 23, 42, 0.14);
}

.login-container .card-header,
.register-container .card-header {
    padding: 28px 30px 20px;
}

.login-container .card-header h3,
.register-container .card-header h1 {
    font-size: 26px;
    font-weight: 800;
    margin: 0 0 8px;
}

.login-container .card-header p,
.register-container .card-header p {
    color: var(--muted);
    margin: 0;
}

.login-container .card-body,
.register-container .card-body {
    padding: 28px 30px 30px;
}

.register-container {
    max-width: 540px;
}

@media (max-width: 767px) {
    h1 {
        font-size: 25px;
    }

    .container {
        max-width: 100%;
    }

    .card-body {
        padding: 16px;
    }

    .table {
        min-width: 760px;
    }

    .card-body:has(.table) {
        overflow-x: auto;
    }
}