:root {
    --admin-bg: #f8f9fa;
    --admin-surface: #ffffff;
    --admin-border: #e8eaed;
    --admin-text: #1f2937;
    --admin-muted: #6b7280;
    --admin-accent: #3854e8;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body.admin-body {
    font-family: -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--admin-bg);
    color: var(--admin-text);
    min-height: 100vh;
    display: flex;
}

.admin-sidebar {
    width: 220px;
    background: var(--admin-surface);
    border-right: 1px solid var(--admin-border);
    padding: 24px 16px;
    flex-shrink: 0;
}

.admin-brand {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 24px;
    padding: 0 8px;
}

.admin-nav { display: flex; flex-direction: column; gap: 4px; }

.admin-nav a {
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 14px;
    color: var(--admin-muted);
    transition: 0.15s;
}

.admin-nav a:hover { background: #f3f4f6; color: var(--admin-text); }

.admin-content { flex: 1; padding: 32px; min-width: 0; }

.admin-page h1 { font-size: 1.5rem; margin-bottom: 24px; }

.admin-page-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.admin-page-head h1 { margin-bottom: 0; }

.admin-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: 10px;
    padding: 20px;
}

.stat-label { font-size: 13px; color: var(--admin-muted); display: block; margin-bottom: 8px; }
.stat-card strong { font-size: 1.75rem; }

.admin-quick { display: flex; gap: 12px; }

.btn-admin-primary,
.btn-admin-secondary {
    display: inline-flex;
    align-items: center;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.btn-admin-primary { background: var(--admin-accent); color: #fff; }
.btn-admin-secondary { background: #fff; color: var(--admin-text); border: 1px solid var(--admin-border); }

.admin-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: 10px;
    overflow: hidden;
}

.admin-table th,
.admin-table td {
    padding: 12px 16px;
    text-align: left;
    font-size: 14px;
    border-bottom: 1px solid var(--admin-border);
}

.admin-table th { background: #f9fafb; font-weight: 600; color: var(--admin-muted); }
.empty-cell { text-align: center; color: var(--admin-muted); }

.badge {
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 6px;
    background: #eef2ff;
    color: var(--admin-accent);
}

.admin-form-wide {
    max-width: 720px;
}

.upload-section {
    padding: 16px;
    border: 1px solid var(--admin-border);
    border-radius: 10px;
    background: #fafbfc;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.upload-section-title {
    font-size: 14px;
    font-weight: 600;
    margin: 0;
}

.upload-section-desc {
    font-size: 12px;
    color: var(--admin-muted);
    margin: -4px 0 0;
}

.upload-field input[type="file"] {
    padding: 8px;
    background: #fff;
    border: 1px dashed #c5cad1;
    border-radius: 8px;
    font-size: 13px;
}

.upload-preview {
    min-height: 0;
}

.upload-preview img {
    max-width: 240px;
    max-height: 160px;
    border-radius: 8px;
    border: 1px solid var(--admin-border);
    object-fit: cover;
}

.upload-hint {
    font-size: 12px;
    color: var(--admin-muted);
}

.admin-form {
    max-width: 640px;
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: 10px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.admin-form label { display: flex; flex-direction: column; gap: 6px; }
.admin-form label span { font-size: 13px; font-weight: 500; color: var(--admin-muted); }

.admin-form input,
.admin-form textarea,
.admin-form select {
    padding: 10px 12px;
    border: 1px solid var(--admin-border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
}

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

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 16px;
}

.alert-success { background: #ecfdf5; color: #059669; }
.alert-error { background: #fef2f2; color: #dc2626; }

.admin-login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.admin-login-card {
    width: 100%;
    max-width: 400px;
    background: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: 12px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.admin-login-card h1 { font-size: 1.25rem; text-align: center; }
.admin-login-card label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; }
.admin-login-card input {
    padding: 10px 12px;
    border: 1px solid var(--admin-border);
    border-radius: 8px;
}

.admin-back { text-align: center; font-size: 13px; color: var(--admin-muted); }

@media (max-width: 768px) {
    body.admin-body { flex-direction: column; }
    .admin-sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--admin-border); }
}