/* ========== admin/style.css - 悬浮菜单右下角，标题居中 ========== */
:root {
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #e9eef3 100%);
    --card-bg: rgba(255,255,255,0.75);
    --text: #2d3748;
    --text-secondary: #4a5568;
    --primary: #3b82f6;
    --border: rgba(0,0,0,0.08);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
    --input-bg: rgba(255,255,255,0.6);
    --hover-bg: rgba(59,130,246,0.08);
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
}

* { margin:0; padding:0; box-sizing:border-box; font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
body { background: var(--bg-gradient); color: var(--text); min-height: 100vh; padding: 20px; }

/* ========== 移动端悬浮菜单按钮（右下角，圆角5px） ========== */
.mobile-fab {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: 5px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    z-index: 150;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    color: #2d3748;
    transition: all 0.2s;
}
.mobile-fab svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    stroke-width: 1.8;
}
.mobile-fab:hover {
    background: #ffffff;
    box-shadow: 0 6px 16px rgba(0,0,0,0.12);
    transform: scale(0.98);
}

/* 移动端导航遮罩 */
.mobile-nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(4px);
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: 0.3s;
}
.mobile-nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ========== 桌面端布局 ========== */
.admin-wrapper { max-width: 1400px; margin: 0 auto; display: flex; gap: 24px; flex-wrap: wrap; }
.admin-nav {
    width: 260px;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 20px 12px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    height: fit-content;
    position: sticky;
    top: 20px;
}
.admin-nav .nav-header { padding: 8px 12px 20px; border-bottom: 1px solid var(--border); margin-bottom: 12px; }
.admin-nav .nav-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.admin-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    margin-bottom: 4px;
}
.admin-nav a svg { width: 20px; height: 20px; stroke: currentColor; stroke-width: 1.8; fill: none; }
.admin-nav a:hover { background: var(--hover-bg); color: var(--primary); }
.admin-nav a.active { background: rgba(59,130,246,0.15); color: var(--primary); font-weight: 600; }

.admin-content {
    flex: 1;
    min-width: 0;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

/* 页面标题区域：标题居中 */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}
.page-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    text-align: center;
    flex: 1;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--primary);
    color: white;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(59,130,246,0.3); opacity: 0.9; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--hover-bg); border-color: var(--primary); box-shadow: none; }
.btn-danger { background: var(--danger); }
.btn-sm { padding: 6px 14px; font-size: 0.85rem; }

.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 16px;
    background: var(--input-bg);
    margin-bottom: 20px;
    max-width: 100%;
}
table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}
th {
    text-align: left;
    padding: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    white-space: nowrap;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--hover-bg); }

.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.actions a, .actions button {
    padding: 6px 10px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    border: none;
    background: transparent;
    cursor: pointer;
}
.actions a:hover { background: var(--primary); color: white; }
.actions .delete:hover { background: var(--danger); color: white; }

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 30px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-success { background: rgba(16,185,129,0.15); color: var(--success); }
.badge-warning { background: rgba(245,158,11,0.15); color: var(--warning); }
.badge-danger { background: rgba(239,68,68,0.15); color: var(--danger); }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px,1fr));
    gap: 16px;
    margin-bottom: 30px;
}
.stat-card {
    background: var(--input-bg);
    padding: 20px 16px;
    border-radius: 20px;
    border: 1px solid var(--border);
}
.stat-card h3 { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 8px; }
.stat-card .number { font-size: 2rem; font-weight: 700; color: var(--primary); }

.form-card {
    background: var(--input-bg);
    border-radius: 20px;
    padding: 24px;
    border: 1px solid var(--border);
}
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 500; color: var(--text); }
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 14px;
    color: var(--text);
    font-size: 1rem;
    transition: all 0.2s;
}
.form-group input[type="file"] {
    padding: 8px;
    background: transparent;
    border: 1px dashed var(--border);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}
.img-preview { margin-bottom: 10px; }
.img-preview img {
    max-height: 60px;
    max-width: 100%;
    border-radius: 8px;
    background: var(--card-bg);
    padding: 4px;
    border: 1px solid var(--border);
}
.hint { font-size: 0.75rem; color: var(--text-secondary); margin-top: 4px; }
.message {
    padding: 14px 18px;
    border-radius: 16px;
    margin-bottom: 24px;
    font-weight: 500;
}
.message.success { background: rgba(16,185,129,0.15); color: var(--success); border: 1px solid var(--success); }
.message.error { background: rgba(239,68,68,0.15); color: var(--danger); border: 1px solid var(--danger); }
.form-actions { margin-top: 24px; display: flex; gap: 12px; flex-wrap: wrap; }
.config-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

/* ========== 移动端响应式 ========== */
@media (max-width: 768px) {
    body { padding: 12px; }
    .mobile-fab { display: flex; }
    .mobile-nav-overlay { display: block; }
    .admin-wrapper { margin-top: 0; }
    .admin-nav {
        position: fixed !important;
        top: 0 !important;
        left: -280px !important;
        width: 260px !important;
        height: 100vh !important;
        z-index: 250 !important;
        transition: left 0.3s ease !important;
        margin: 0 !important;
        border-radius: 0 20px 20px 0 !important;
        overflow-y: auto !important;
        box-shadow: 4px 0 20px rgba(0,0,0,0.15) !important;
    }
    .admin-nav.mobile-open { left: 0 !important; }
    .admin-content {
        width: 100%;
        margin: 0;
        border-radius: 16px;
        padding: 20px 16px;
    }
    .config-grid { grid-template-columns: 1fr !important; gap: 16px; }
    .form-group input, .form-group textarea, .form-group select {
        width: 100% !important;
        max-width: 100%;
    }
    .page-header h1 { font-size: 1.5rem; }
    .btn { padding: 8px 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
    .admin-content { padding: 16px 12px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .btn { width: 100%; justify-content: center; }
    .form-actions .btn { width: auto; flex: 1; }
}

/* 桌面端彻底隐藏移动端悬浮按钮 */
@media (min-width: 769px) {
    .mobile-fab,
    .mobile-nav-overlay {
        display: none !important;
    }
}