html {
    font-size: 14px;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

/* 修改 Root 變數：定義象牙白與黑色文字色標 */
:root {
    --ft-ivory: #F9F9F2; /* 象牙白 */
    --ft-text-black: #212529; /* 黑色字體 */
    --ft-tech-cyan: #00A8CC; /* 品牌青色（保留作為點綴） */
    --ft-industrial-gray: #E9ECEF;
    --ft-text-main: #2D3436;
}

html {
    position: relative;
    min-height: 100%;
}

body {
    color: var(--ft-text-main);
    background-color: #FFFFFF;
    font-family: 'Segoe UI', 'Microsoft JhengHei', sans-serif;
}

/* --- Navbar 修改區塊 --- */
.navbar {
    /* 改為象牙白，並將原本的深藍強制覆蓋改為淺色邊框 */
    background-color: var(--ft-ivory) !important;
    border-bottom: 1px solid rgba(0,0,0,0.1) !important;
}

.navbar-brand img {
    width: auto; /* 寬度自動，保持比例 */
    max-height: 50px; /* 限制最大高度，避免意外撐大 Navbar */
    object-fit: contain;
}

.nav-link {
    color: var(--ft-text-black) !important; /* 文字改為黑色 */
}

    .nav-link:hover {
        color: var(--ft-tech-cyan) !important; /* 滑過時保留青色點綴 */
    }

/* 修正 Mega Menu 顏色與象牙白對齊 */
.mega-menu-content {
    background-color: #FFFFFF !important; /* 內容盒使用純白與象牙白做層次 */
    width: 100vw;
    left: 0 !important;
    right: 0 !important;
    margin-top: 0 !important;
    border-radius: 0 !important;
    position: absolute !important;
    border-top: 1px solid var(--ft-ivory);
}

.dropdown-header {
    font-size: 1.1rem;
    color: var(--ft-text-black); /* 標題改為黑色 */
    padding-left: 0;
    margin-bottom: 0.5rem;
}

.dropdown-item {
    color: #555;
}

    .dropdown-item:hover {
        background-color: var(--ft-ivory); /* 滑過時背景變象牙白 */
        color: var(--ft-tech-cyan);
        padding-left: 1.5rem;
        transition: all 0.2s;
    }

/* --- 下方為不需要改動的產品卡片與按鈕邏輯 (保留) --- */

.dropdown:hover .dropdown-menu {
    display: block;
    margin-top: 0;
}

.dropdown-static {
    position: static !important;
}

.dropdown-menu {
    border-radius: 0 0 10px 10px;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-bg {
    min-height: 500px;
    display: flex;
    align-items: center;
}

.category-card img {
    transition: transform 0.5s ease;
}

.category-card:hover img {
    transform: scale(1.1);
}

.category-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.1) 60%);
    transition: background 0.3s;
}

.category-card:hover .category-overlay {
    background: linear-gradient(to top, rgba(13,110,253,0.8) 0%, rgba(0,0,0,0.3) 100%);
}

.btn-primary {
    background-color: var(--ft-tech-cyan);
    border-color: var(--ft-tech-cyan);
    transition: all 0.3s ease;
}

    .btn-primary:hover {
        background-color: #0086A3;
        border-color: #0086A3;
        transform: translateY(-2px);
        box-shadow: 0 4px 15px rgba(0, 168, 204, 0.3);
    }

.btn-outline-info {
    color: var(--ft-tech-cyan);
    border-color: var(--ft-tech-cyan);
}

    .btn-outline-info:hover {
        background-color: var(--ft-tech-cyan);
        border-color: var(--ft-tech-cyan);
        color: white;
    }

.card {
    border: none;
    transition: transform 0.3s ease;
}

.bg-light {
    background-color: var(--ft-industrial-gray) !important;
}

h2.fw-bold {
    color: var(--ft-text-black); /* 標題對應黑色 */
    position: relative;
    padding-bottom: 10px;
}

    h2.fw-bold::after {
        content: "";
        position: absolute;
        left: 0;
        bottom: 0;
        width: 50px;
        height: 4px;
        background-color: var(--ft-tech-cyan);
    }