:root { 
    --primary-blue: #0066cc; 
    --primary-hover: #0052a3;
    --light-bg: #f4f7fa; 
    --card-bg: #ffffff;
    --text-main: #1e293b; 
    --text-sub: #475569;
    --border-color: #cbd5e1;
}

body { 
    margin: 0; 
    font-family: 'Segoe UI', sans-serif; 
    background-color: var(--light-bg); 
    color: var(--text-main); 
    background-image: 
        linear-gradient(rgba(0, 102, 204, 0.04) 1px, transparent 1px), 
        linear-gradient(90deg, rgba(0, 102, 204, 0.04) 1px, transparent 1px); 
    background-size: 30px 30px; 
    padding-bottom: 50px;
}

/* 共用導覽列 (首頁用) */
nav {
    position: fixed; top: 0; left: 0; width: 100%; height: 70px;
    background: rgba(255, 255, 255, 0.9); 
    border-bottom: 1px solid var(--border-color);
    display: flex; justify-content: center; align-items: center; z-index: 1000;
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}
.nav-item {
    position: absolute; width: 100%; text-align: center;
    font-size: 1.5rem; font-weight: bold; color: var(--primary-blue);
    text-decoration: none; letter-spacing: 1px;
    opacity: 0; transition: opacity 0.5s ease-in-out, transform 0.3s;
    pointer-events: none;
}
.nav-item.active { opacity: 1; pointer-events: auto; }
.nav-item:hover { color: var(--primary-hover); transform: scale(1.02); }

/* 共用標題與內容區塊 */
.hero { margin-top: 110px; text-align: center; padding: 40px 20px; }
.hero h1, h1 { color: #0f172a; font-size: 2.5rem; font-weight: 700; margin-bottom: 20px; }
.hero p { max-width: 800px; margin: 20px auto; line-height: 1.8; color: var(--text-sub); font-size: 1.1rem; }

/* 子網頁獨立標題置中 */
h1 { 
    color: #0f172a; 
    font-size: 2.5rem; 
    font-weight: 700; 
    text-align: center; /* 讓子網頁標題置中 */
    margin-top: 100px;
    margin-bottom: 20px;
}

/* 子網頁內容容器 */
.content { 
    max-width: 800px; 
    margin: 40px auto 0 auto; 
    text-align: left; 
    line-height: 1.8; 
    font-size: 1.05rem; 
    background: var(--card-bg); 
    padding: 40px; 
    border-radius: 12px; 
    border: 1px solid var(--border-color); 
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
    color: var(--text-sub);
}
.content p { margin-top: 0; }
.content ul { padding-left: 20px; margin-bottom: 0; }
.content li { margin-bottom: 12px; }
.content strong { color: var(--primary-blue); }

/* 首頁網格卡片 */
.solutions-grid { 
    display: grid; gap: 24px; max-width: 1000px; margin: 0 auto 40px; padding: 0 20px; 
}
.grid-card { 
    border: 1px solid var(--border-color); padding: 24px; text-align: left; border-radius: 12px; 
    background: var(--card-bg); text-decoration: none; color: var(--text-main); display: block;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02); transition: all 0.3s ease;
}
.grid-card h3 { color: var(--primary-blue); margin-top: 0; margin-bottom: 10px; font-size: 1.25rem; }
.grid-card p { 
    margin: 0; color: var(--text-sub); line-height: 1.6; min-height: calc(1.6em * 3); 
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.grid-card:hover {
    box-shadow: 0 10px 25px -5px rgba(0, 102, 204, 0.15);
    border-color: var(--primary-blue); transform: translateY(-4px);
}

/* 共用按鈕與 Footer */
footer { text-align: center; padding: 40px 20px; background: #ffffff; border-top: 1px solid var(--border-color); margin-top: 60px; }
/* 讓返回按鈕本身可以置中顯示 */
.back-btn-container {
    text-align: center;
    margin-top: 30px;
}
.footer-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 40px; /* 控制左側按鈕群與右側 QR Code 的間距 */
}

/* 左側：電話與 Email 按鈕群組 */
.contact-info-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: flex-start;
}
.contact-box, .back-btn { 
    display: inline-block; 
    margin: 0; 
    padding: 12px 28px; 
    border: 1px solid var(--primary-blue); 
    border-radius: 50px; 
    cursor: pointer; 
    color: var(--primary-blue); 
    background: #f0f7ff; 
    font-weight: 600; 
    text-decoration: none; 
    transition: all 0.3s; 
    white-space: nowrap;
}
.contact-box:hover, .back-btn:hover { 
    background: var(--primary-blue); 
    color: #ffffff; 
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.25); 
    transform: translateY(-2px);
}

/* 右側：LINE 條碼區塊 */
.line-qr-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    background: #f8fafc;
    padding: 15px 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}
.line-qr-section p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-sub);
    font-weight: 600;
}
.line-qr-img {
    width: 110px;
    height: 110px;
    border-radius: 6px;
    background: #ffffff;
    padding: 4px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* 手機版適應：螢幕較小時自動改為上下堆疊，避免擠壓 */
@media (max-width: 768px) {
    .footer-container {
        flex-direction: column;
        gap: 25px;
    }
    .contact-info-group {
        align-items: center;
        width: 100%;
    }
    .contact-box {
        width: 80%;
        text-align: center;
    }
    .solutions-grid { 
        grid-template-columns: 1fr !important; 
    }
}
/* Toast 提示框 */
#toast { 
    visibility: hidden; background-color: #0f172a; color: #ffffff; text-align: center; 
    padding: 16px 24px; position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%); 
    border-radius: 8px; font-weight: 600; opacity: 0; transition: 0.3s; 
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2); z-index: 1001;
}
#toast.show { visibility: visible; opacity: 1; }

@media (max-width: 768px) {
    .solutions-grid { grid-template-columns: 1fr !important; }
}