/* --- 1. 核心設定 --- */
:root {
    --brand-blue: #1736F5;
    --brand-dark: #0b1a7a;
    --accent-yellow: #FFC709;
    --text-dark: #333333;
}

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

body {
    background-color: var(--brand-blue);
    background-image: radial-gradient(circle at 50% 10%, #4c6aff 0%, var(--brand-blue) 40%, var(--brand-dark) 100%);
    font-family: 'PingFang TC', 'Microsoft JhengHei', sans-serif;
    min-height: 100vh;
    padding: 40px 20px 120px 20px;
    display: flex;
    justify-content: center;
    color: #fff;
}

.container {
    width: 100%;
    max-width: 1100px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

/* --- 2. 標題區 (透明度 0.8) --- */
.header-card {
    grid-column: span 3;
    background: rgba(255, 255, 255, 1);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 30px;
    padding: 40px;
    text-align: left;
    position: relative;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* [修改] 大標題加粗 */
.header-content h1 { 
    /* 指定特粗黑體 */
    font-family: 'Noto Sans TC', sans-serif;
    font-weight: 900;
    
    font-size: 3rem; 
    margin-bottom: 10px; 
    color: var(--brand-blue); 
    line-height: 1.1;
}

.header-content p { 
    font-size: 1.2rem; 
    color: #333; 
    font-weight: 600;
}

.header-tag {
    background: var(--accent-yellow);
    color: var(--brand-blue);
    font-weight: 900;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    display: inline-block;
    margin-bottom: 15px;
}

/* --- 3. 核心概念卡片 (寬版) --- */
.concept-card {
    grid-column: span 3;
    background: #FFC709;
    backdrop-filter: blur(15px);
    border-radius: 30px;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    display: flex;
    align-items: center;
    gap: 30px;
    position: relative;
    overflow: hidden;
}

/* [修改] 核心概念標題加粗 */
.concept-text h2 { 
    /* 指定特粗黑體 */
    font-family: 'Noto Sans TC', sans-serif;
    font-weight: 900;
    
    color: var(--brand-blue); 
    font-size: 1.8rem; 
    margin-bottom: 15px; 
}

.concept-text p { color: #333; font-size: 1.1rem; line-height: 1.6; font-weight: 500; }

/* --- 4. 優勢卡片 (3欄) --- */
.benefit-card {
    grid-column: span 1;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(15px);
    border-radius: 30px;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    transition: transform 0.3s;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.benefit-card:hover { transform: translateY(-10px); background: rgba(255, 255, 255, 1); }

.icon-box {
    width: 60px; height: 60px;
    background: rgba(255, 199, 9, 1);
    border-radius: 15px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem; color: var(--brand-blue);
    margin-bottom: 20px;
}

/* [修改] 優勢卡片標題加粗 */
.benefit-card h3 { 
    /* 指定特粗黑體 */
    font-family: 'Noto Sans TC', sans-serif;
    font-weight: 900;
    
    color: var(--brand-blue); 
    margin-bottom: 10px; 
    font-size: 1.4rem; 
    position: relative; 
    z-index: 2; 
}

.benefit-card p { color: #333; line-height: 1.5; font-weight: 500; position: relative; z-index: 2; }

/* 背景大數字 */
.bg-number {
    position: absolute; right: -10px; bottom: -20px;
    font-size: 6rem; font-weight: 900; color: var(--brand-blue);
    opacity: 0.1; pointer-events: none; transition: 0.3s;
}
.benefit-card:hover .bg-number { transform: rotate(-10deg) scale(1.1); opacity: 0.2; }


/* --- 5. 商業價值卡片 (黃色強調) --- */
.value-card {
    grid-column: span 3;
    background: var(--accent-yellow);
    color: var(--brand-blue);
    border-radius: 30px;
    padding: 40px;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.value-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-image: radial-gradient(rgba(23, 54, 245, 0.1) 1px, transparent 1px);
    background-size: 15px 15px; opacity: 0.6;
}

.value-content { position: relative; z-index: 2; width: 100%; }

/* [修改] 商業價值大標題加粗 */
.value-card h2 { 
    /* 指定特粗黑體 */
    font-family: 'Noto Sans TC', sans-serif;
    font-weight: 900;
    
    font-size: 2.2rem; 
    margin-bottom: 20px; 
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 20px;
    text-align: left;
}

.value-item {
    background: rgba(255,255,255,0.8);
    padding: 20px;
    border-radius: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

/* [修改] 商業價值小標題加粗 */
.value-item h4 { 
    /* 指定特粗黑體 */
    font-family: 'Noto Sans TC', sans-serif;
    font-weight: 900;
    
    color: var(--brand-blue); 
    font-size: 1.2rem; 
    margin-bottom: 5px; 
}

.value-item p { color: #555; font-size: 0.95rem; line-height: 1.4; }

.cta-btn {
    background: var(--brand-blue);
    color: #fff;
    padding: 15px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    margin-top: 30px;
    display: inline-block;
    box-shadow: 0 5px 20px rgba(23, 54, 245, 0.3);
    transition: 0.3s;
}
.cta-btn:hover { transform: translateY(-3px); box-shadow: 0 10px 25px rgba(23, 54, 245, 0.5); }

/* --- 6. 導覽列 --- */
.dock-nav {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.25);
    backdrop-filter: blur(20px);
    padding: 15px 30px;
    border-radius: 50px;
    display: flex;
    gap: 20px;
    border: 1px solid rgba(255,255,255,0.4);
    z-index: 100;
}
.dock-nav a { text-decoration: none; color: #fff; font-weight: bold; transition: 0.2s; }
.dock-nav a:hover { color: var(--accent-yellow); transform: translateY(-3px); }

/* RWD */
@media (max-width: 900px) {
    .container { grid-template-columns: 1fr; }
    .header-card, .concept-card, .benefit-card, .value-card { grid-column: span 1; }
    .value-grid { grid-template-columns: 1fr; }
    .dock-nav { 
        width: 90%; 
        justify-content: space-between; 
        padding: 12px 20px; 
        gap: 10px;
        bottom: 20px;
    }
    .dock-nav a { font-size: 0.85rem; }
}