/* 全局字体与背景 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f8f9fa; /* 浅灰背景 */
    color: #333;
}

/* 导航栏美化 */
.navbar {
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    background: #fff;
    padding: 1rem 0;
}
.navbar-brand {
    font-weight: 700;
    color: #2563eb !important; /* 品牌蓝 */
}

/* 卡片通用样式 - 大气圆角+阴影 */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    transition: transform 0.2s, box-shadow 0.2s;
    background: #fff;
}
.card:hover {
    /* 悬停时微微上浮 */
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

/* 按钮美化 */
.btn {
    border-radius: 8px;
    padding: 0.6rem 1.5rem;
    font-weight: 500;
    transition: all 0.2s;
}
.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    border: none;
    box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
}
.btn-primary:hover {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    box-shadow: 0 6px 10px rgba(37, 99, 235, 0.3);
}

/* 团购商品列表样式 */
.goods-price {
    color: #dc2626;
    font-size: 1.5rem;
    font-weight: 700;
}
.goods-stock {
    font-size: 0.85rem;
    color: #6b7280;
}

/* 登录/注册页容器 */
.auth-box {
    max-width: 400px;
    margin: 3rem auto;
    padding: 2rem;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.05);
}

/* 底部 */
.footer {
    margin-top: 3rem;
    padding: 2rem 0;
    text-align: center;
    color: #9ca3af;
    font-size: 0.9rem;
}

/* 移动端适配微调 */
@media (max-width: 768px) {
    .container { padding-left: 20px; padding-right: 20px; }
    .card { margin-bottom: 1rem; }
}