/* ============================================
   后台管理 - 专属样式
   ============================================ */

/* ========== 登录页 ========== */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-image:
        radial-gradient(ellipse at 20% 30%, rgba(59,130,246,0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(6,182,212,0.08) 0%, transparent 50%);
}

.login-container { width: 100%; max-width: 420px; padding: 20px; }

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-lg);
    padding: 40px 36px;
    box-shadow: 0 0 60px rgba(59,130,246,0.1), 0 20px 40px rgba(0,0,0,0.4);
    position: relative;
    overflow: hidden;
}
.login-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-cyan), var(--accent-purple));
}

.login-logo { text-align: center; margin-bottom: 30px; }
.login-logo .login-icon {
    width: 64px; height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--accent), var(--accent-cyan));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    box-shadow: 0 0 30px rgba(59,130,246,0.4);
}
.login-logo h1 {
    font-size: 22px;
    background: linear-gradient(135deg, var(--accent-light), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.login-logo p { color: var(--text-muted); font-size: 13px; margin-top: 6px; }

.login-error {
    background: rgba(239,68,68,0.1);
    border: 1px solid rgba(239,68,68,0.3);
    color: var(--accent-red);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
    text-align: center;
}

.login-form .login-field { margin-bottom: 20px; }
.login-form label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.login-form input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 15px;
    transition: var(--transition);
}
.login-form input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.login-btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent), #2563eb);
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 8px;
}
.login-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(59,130,246,0.4); }

.login-tip {
    margin-top: 24px;
    padding: 12px 16px;
    background: rgba(245,158,11,0.08);
    border: 1px solid rgba(245,158,11,0.2);
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.8;
}
.login-tip strong { color: var(--accent-orange); }

.login-footer { text-align: center; margin-top: 20px; }
.login-footer a { font-size: 13px; color: var(--text-muted); }
.login-footer a:hover { color: var(--accent-light); }

/* ========== 后台主布局 ========== */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 240px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-primary);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 200;
    transition: transform 0.3s ease;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-primary);
    height: 64px;
}
.sidebar-logo .logo-icon {
    width: 36px; height: 36px;
    background: linear-gradient(135deg, var(--accent), var(--accent-cyan));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}
.sidebar-logo .logo-text {
    font-size: 16px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-light), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: 4px;
    transition: var(--transition);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
}
.nav-item:hover {
    background: rgba(59,130,246,0.08);
    color: var(--accent-light);
}
.nav-item.active {
    background: linear-gradient(135deg, rgba(59,130,246,0.15), rgba(6,182,212,0.1));
    color: var(--accent-light);
    border-left: 3px solid var(--accent);
    padding-left: 13px;
}
.nav-item.nav-logout:hover {
    background: rgba(239,68,68,0.1);
    color: var(--accent-red);
}
.nav-icon { font-size: 18px; width: 24px; text-align: center; }

/* ========== 主内容区 ========== */
.admin-main {
    flex: 1;
    margin-left: 240px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.admin-topbar {
    height: 64px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 16px;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.sidebar-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    width: 36px; height: 36px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 18px;
}

.topbar-title {
    flex: 1;
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 10px;
}
.user-avatar {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-cyan));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 600;
    font-size: 15px;
}
.user-name { font-size: 14px; color: var(--text-secondary); }

.admin-content {
    flex: 1;
    padding: 24px;
    max-width: 100%;
}

/* ========== 仪表盘 ========== */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 24px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}
.stat-card:hover { border-color: var(--border-glow); transform: translateY(-2px); }
.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 4px; height: 100%;
    background: var(--card-accent, var(--accent));
}

.stat-card.blue { --card-accent: var(--accent); }
.stat-card.cyan { --card-accent: var(--accent-cyan); }
.stat-card.green { --card-accent: var(--accent-green); }
.stat-card.purple { --card-accent: var(--accent-purple); }

.stat-card .stat-icon {
    position: absolute;
    top: 20px; right: 20px;
    font-size: 32px;
    opacity: 0.2;
}
.stat-card .stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}
.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}
.stat-card .stat-sub {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

/* ========== 图表区 ========== */
.chart-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.chart-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* CSS柱状图 */
.bar-chart {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    height: 200px;
    padding-top: 20px;
}
.bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    height: 100%;
    justify-content: flex-end;
}
.bar-fill {
    width: 100%;
    max-width: 40px;
    background: linear-gradient(180deg, var(--accent-cyan), var(--accent));
    border-radius: 4px 4px 0 0;
    transition: height 0.6s ease;
    min-height: 4px;
    position: relative;
}
.bar-fill:hover { filter: brightness(1.2); }
.bar-fill::after {
    content: attr(data-value);
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    color: var(--text-secondary);
    white-space: nowrap;
}
.bar-label { font-size: 12px; color: var(--text-muted); }

/* 分类统计列表 */
.category-list { display: flex; flex-direction: column; gap: 12px; }
.category-item { display: flex; align-items: center; gap: 12px; }
.category-name { width: 100px; font-size: 13px; color: var(--text-secondary); }
.category-bar-bg {
    flex: 1;
    height: 24px;
    background: var(--bg-input);
    border-radius: 12px;
    overflow: hidden;
}
.category-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-cyan));
    border-radius: 12px;
    transition: width 0.6s ease;
    min-width: 2px;
}
.category-count { font-size: 13px; color: var(--text-primary); font-weight: 600; min-width: 30px; text-align: right; }

/* ========== 产品管理 ========== */
.product-img-thumb {
    width: 50px; height: 50px;
    border-radius: 6px;
    object-fit: cover;
    background: var(--bg-input);
    border: 1px solid var(--border-primary);
}

.status-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}
.status-toggle.on { background: rgba(16,185,129,0.15); color: var(--accent-green); }
.status-toggle.off { background: rgba(100,116,139,0.15); color: var(--text-muted); }

/* ========== 表单页 ========== */
.form-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 30px;
    max-width: 700px;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-primary);
}

.img-preview-box {
    width: 120px; height: 120px;
    border-radius: var(--radius-md);
    border: 1px dashed var(--border-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-input);
    overflow: hidden;
    margin-top: 8px;
}
.img-preview-box img { width: 100%; height: 100%; object-fit: cover; }
.img-preview-box .placeholder { color: var(--text-muted); font-size: 12px; }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .chart-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .admin-sidebar {
        transform: translateX(-100%);
    }
    body.sidebar-open .admin-sidebar {
        transform: translateX(0);
    }
    .admin-main {
        margin-left: 0;
    }
    .sidebar-toggle { display: flex; align-items: center; justify-content: center; }
    .admin-content { padding: 16px; }
    .stat-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .stat-card { padding: 16px; }
    .stat-card .stat-value { font-size: 22px; }
    .user-name { display: none; }
}

@media (max-width: 480px) {
    .stat-grid { grid-template-columns: 1fr; }
    .bar-chart { height: 150px; gap: 6px; }
    .bar-label { font-size: 10px; }
    .form-card { padding: 20px; }
}