/* --- 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. 方案卡片 (透明度 0.5) --- */
.plan-card {
    grid-column: span 1; 
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: 30px;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.plan-card:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    z-index: 10;
}

.plan-number {
    font-size: 4rem;
    font-weight: 900;
    color: var(--brand-blue);
    opacity: 0.1;
    position: absolute;
    top: 10px;
    right: 20px;
    font-family: 'Arial', sans-serif;
}

/* [修改] 方案標題加粗 */
.plan-title {
    /* 指定特粗黑體 */
    font-family: 'Noto Sans TC', sans-serif;
    font-weight: 900;
    
    font-size: 1.8rem;
    color: var(--brand-blue);
    margin-bottom: 10px;
    position: relative; z-index: 2;
}

.plan-price {
    font-size: 1.6rem;
    color: #333;
    font-weight: 800;
    margin-bottom: 20px;
    display: flex;
    align-items: baseline;
    gap: 5px;
}
.plan-price span { font-size: 1rem; color: #555; font-weight: normal; }

.price-tag {
    background: var(--accent-yellow);
    padding: 2px 10px;
    border-radius: 5px;
    margin-left: 10px;
    font-size: 1.2rem;
    color: var(--brand-blue);
}

.plan-features {
    list-style: none;
    margin-bottom: 20px;
    flex-grow: 1; 
}

.plan-features li {
    margin-bottom: 10px;
    color: #333;
    font-weight: 600;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
.plan-features li::before {
    content: '✓';
    color: var(--brand-blue);
    font-weight: 900;
}

.plan-desc {
    font-size: 0.9rem;
    color: #FFF;
    line-height: 1.6;
    background: rgba(23, 54, 245, 1);
    padding: 15px;
    border-radius: 15px;
    margin-bottom: 20px;
}

.cta-btn {
    background: var(--brand-blue);
    color: #fff;
    text-align: center;
    padding: 12px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: 0.3s;
    box-shadow: 0 5px 15px rgba(23, 54, 245, 0.3);
}
.cta-btn:hover { background: var(--accent-yellow); color: var(--brand-blue); }


/* --- 4. 廣告代投區 --- */
.ad-card {
    grid-column: span 3;
    background: var(--accent-yellow);
    color: var(--brand-blue);
    border-radius: 30px;
    padding: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: transform 0.3s;
    position: relative;
    overflow: hidden;
}

.ad-card:hover { transform: translateY(-5px); }

.ad-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;
}

.ad-content { position: relative; z-index: 2; flex: 1; }

/* [修改] 廣告標題加粗 */
.ad-card h2 { 
    /* 指定特粗黑體 */
    font-family: 'Noto Sans TC', sans-serif;
    font-weight: 900;
    
    font-size: 2.2rem; 
    margin-bottom: 15px; 
}

.ad-card p { color: #333; font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; }

.ad-price-box {
    background: #fff;
    padding: 20px 30px;
    border-radius: 20px;
    text-align: right;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    position: relative; z-index: 2;
}

/* --- 5. 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, .plan-card, .ad-card { grid-column: span 1; }
    .ad-card { flex-direction: column; text-align: left; align-items: flex-start; gap: 20px; }
    .ad-price-box { width: 100%; text-align: center; }
    .dock-nav { 
        width: 90%; 
        justify-content: space-between; 
        padding: 12px 20px; 
        gap: 10px;
        bottom: 20px;
    }
    .dock-nav a { font-size: 0.85rem; }
    .header-content h1 { font-size: 2.2rem; }
}