@charset "UTF-8";

/* ============================================================
   三久太陽能 - 認識太陽能頁 (s39-why)
   使用方式：<section class="s39-why-section">
   需搭配 s39-nav-footer.css 一起使用
   ============================================================ */

/* ============================================================
   頁面主標題 (與 about 頁面同風格 - 高度 200px)
   ============================================================ */
.s39-why-hero {
    background: linear-gradient(135deg, #3a8fd4 0%, #6bb0e8 100%);
    color: white;
    padding: 0;
    height: 200px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.s39-why-hero::after {
    
    font-size: 160px;
    opacity: 0.06;
    position: absolute;
    right: -10px;
    bottom: -20px;
    transform: rotate(12deg);
}

.s39-why-hero .s39-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 2;
    width: 100%;
}

.s39-why-hero .s39-hero-text {
    flex: 1 1 50%;
}

.s39-why-hero .s39-hero-text h1 {
    font-size: 48px;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 4px;
    line-height: 1.2;
}

.s39-why-hero .s39-breadcrumb {
    color: rgba(255, 255, 255, 0.85);
    font-size: 22px;
}

.s39-why-hero .s39-breadcrumb a {
    color: #ffe484;
    text-decoration: none;
    transition: color 0.2s;
}

.s39-why-hero .s39-breadcrumb a:hover {
    text-decoration: underline;
    color: #ffffff;
}

.s39-why-hero .s39-hero-image {
    flex: 1 1 40%;
    text-align: center;
}

.s39-why-hero .s39-hero-image img {
    max-width: 85%;
    height: auto;
    max-height: 210px;
    display: block;
    background: transparent;
    margin: 0 auto;
}

/* ----- 內容區塊 ----- */
.s39-why-section {
    padding: 50px 0;
    background: #ffffff;
}

.s39-why-section.s39-bg-sky {
    background: #e8f2fc;
}

.s39-why-section .s39-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ----- 區塊標題 ----- */
.s39-why-section .s39-section-title {
    font-size: 34px;
    font-weight: 700;
    color: #1a5a96;
    margin-bottom: 6px;
}

.s39-why-section .s39-section-divider {
    width: 60px;
    height: 3px;
    background: #6bb0e8;
    margin: 8px 0 20px 0;
}

.s39-why-section .s39-section-divider.s39-center {
    margin: 8px auto 20px auto;
}

.s39-why-section .s39-section-sub {
    color: #4a6a8a;
    font-size: 20px;
    margin-bottom: 24px;
}

/* ----- 主視覺 Banner ----- */
.s39-why-banner {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(43, 123, 201, 0.10);
    margin-bottom: 30px;
}

.s39-why-banner img {
    width: 100%;
    height: auto;
    display: block;
}

/* ----- 產品特色簡介 (首段) ----- */
.s39-why-intro {
    background: #e8f2fc;
    border-radius: 20px;
    padding: 30px 36px;
    margin-bottom: 30px;
    border-left: 5px solid #2b7bc9;
}

.s39-why-intro p {
    font-size: 19px;
    color: #1e2a4a;
    line-height: 1.9;
    margin-bottom: 6px;
}

.s39-why-intro p:last-child {
    margin-bottom: 0;
}

.s39-why-intro .s39-highlight {
    color: #2b7bc9;
    font-weight: 600;
}

/* ----- 優質太陽能熱水器的要件 (四大項) ----- */
.s39-feature-block {
    margin-top: 30px;
}

.s39-feature-block .s39-feature-title {
    font-size: 26px;
    font-weight: 700;
    color: #1a5a96;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 3px solid #6bb0e8;
}

.s39-feature-block .s39-feature-title i {
    color: #2b7bc9;
    margin-right: 10px;
}

.s39-feature-list {
    list-style: none;
    padding: 0;
    margin: 0 0 28px 0;
}

.s39-feature-list li {
    font-size: 18px;
    color: #1e2a4a;
    line-height: 1.8;
    padding: 10px 0 10px 32px;
    position: relative;
    border-bottom: 1px solid #eef4fa;
}

.s39-feature-list li:last-child {
    border-bottom: none;
}

.s39-feature-list li::before {
    content: "◆";
    color: #2b7bc9;
    font-size: 16px;
    position: absolute;
    left: 6px;
    top: 10px;
}

.s39-feature-list li .s39-bold {
    font-weight: 600;
    color: #1a5a96;
}

/* ----- 四大特色網格 (卡片式) ----- */
.s39-why-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 10px;
}

.s39-why-grid .s39-why-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 28px 26px;
    box-shadow: 0 2px 12px rgba(43, 123, 201, 0.06);
    border: 1px solid #dce8f5;
    transition: transform 0.2s, box-shadow 0.2s;
}

.s39-why-grid .s39-why-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(43, 123, 201, 0.10);
}

.s39-why-grid .s39-why-card .s39-card-icon {
    font-size: 36px;
    color: #2b7bc9;
    background: #e4effa;
    width: 60px;
    height: 60px;
    line-height: 60px;
    text-align: center;
    border-radius: 50%;
    margin-bottom: 14px;
}

.s39-why-grid .s39-why-card h4 {
    font-size: 22px;
    font-weight: 700;
    color: #1a5a96;
    margin-bottom: 10px;
}

.s39-why-grid .s39-why-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.s39-why-grid .s39-why-card ul li {
    font-size: 17px;
    color: #1e2a4a;
    line-height: 1.7;
    padding: 5px 0 5px 22px;
    position: relative;
}

.s39-why-grid .s39-why-card ul li::before {
    content: "▸";
    color: #2b7bc9;
    font-weight: 700;
    position: absolute;
    left: 2px;
    top: 5px;
}

/* ----- 三久與日本同步 (底部強調) ----- */
.s39-why-sync {
    background: linear-gradient(135deg, #2b7bc9, #4a9ad9);
    color: #ffffff;
    border-radius: 20px;
    padding: 34px 40px;
    text-align: center;
    margin-top: 30px;
}

.s39-why-sync h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 6px;
}

.s39-why-sync h3 i {
    margin-right: 10px;
}

.s39-why-sync p {
    font-size: 19px;
    opacity: 0.92;
    line-height: 1.8;
}

.s39-why-sync .s39-sync-highlight {
    color: #ffe484;
    font-weight: 600;
}

/* ============================================================
   響應式設計 (RWD)
   ============================================================ */

/* 平板 (max-width: 992px) */
@media (max-width: 992px) {
    .s39-why-hero {
        height: 180px;
    }

    .s39-why-hero .s39-hero-text h1 {
        font-size: 36px;
    }

    .s39-why-hero .s39-breadcrumb {
        font-size: 18px;
    }

    .s39-why-hero .s39-hero-image {
        flex: 1 1 100%;
        text-align: center;
    }

    .s39-why-hero .s39-hero-image img {
        max-width: 55%;
        max-height: 120px;
        transform: none;
    }

    .s39-why-hero .s39-hero-text {
        transform: translateY(-30px);
    }

    .s39-why-section .s39-section-title {
        font-size: 30px;
    }

    .s39-why-section .s39-section-sub {
        font-size: 18px;
    }

    .s39-why-intro p {
        font-size: 18px;
    }

    .s39-why-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .s39-why-grid .s39-why-card h4 {
        font-size: 20px;
    }

    .s39-why-grid .s39-why-card ul li {
        font-size: 16px;
    }

    .s39-feature-block .s39-feature-title {
        font-size: 24px;
    }

    .s39-feature-list li {
        font-size: 17px;
    }

    .s39-why-sync h3 {
        font-size: 26px;
    }

    .s39-why-sync p {
        font-size: 18px;
    }
}

/* 手機 (max-width: 768px) */
@media (max-width: 768px) {
    .s39-why-hero {
        height: 170px;
    }

    .s39-why-hero .s39-hero-text h1 {
        font-size: 30px;
    }

    .s39-why-hero .s39-breadcrumb {
        font-size: 16px;
    }

    .s39-why-hero .s39-hero-image img {
        max-width: 65%;
        max-height: 150px;
        transform: translate(60px, -30px);
    }

    .s39-why-hero .s39-hero-text {
        transform: translateY(30px);
    }

    .s39-why-section .s39-section-title {
        font-size: 26px;
    }

    .s39-why-section .s39-section-sub {
        font-size: 17px;
    }

    .s39-why-intro {
        padding: 24px 20px;
    }

    .s39-why-intro p {
        font-size: 17px;
    }

    .s39-why-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .s39-why-grid .s39-why-card {
        padding: 24px 20px;
    }

    .s39-why-grid .s39-why-card h4 {
        font-size: 20px;
    }

    .s39-why-grid .s39-why-card ul li {
        font-size: 16px;
    }

    .s39-why-grid .s39-why-card .s39-card-icon {
        font-size: 30px;
        width: 50px;
        height: 50px;
        line-height: 50px;
    }

    .s39-feature-block .s39-feature-title {
        font-size: 22px;
    }

    .s39-feature-list li {
        font-size: 16px;
        padding: 8px 0 8px 28px;
    }

    .s39-feature-list li::before {
        top: 8px;
    }

    .s39-why-sync {
        padding: 28px 22px;
    }

    .s39-why-sync h3 {
        font-size: 24px;
    }

    .s39-why-sync p {
        font-size: 17px;
    }
}

/* 小手機 (max-width: 480px) */
@media (max-width: 480px) {
    .s39-why-hero {
        height: 140px;
    }

    .s39-why-hero .s39-hero-text h1 {
        font-size: 24px;
    }

    .s39-why-hero .s39-breadcrumb {
        font-size: 14px;
    }

    .s39-why-hero .s39-hero-image img {
        max-width: 58%;
        max-height: 110px;
        transform: translate(60px, -30px);
    }

    .s39-why-hero .s39-hero-text {
        transform: translateY(30px);
    }

    .s39-why-section .s39-section-title {
        font-size: 22px;
    }

    .s39-why-section .s39-section-sub {
        font-size: 16px;
    }

    .s39-why-intro p {
        font-size: 16px;
    }

    .s39-why-grid .s39-why-card {
        padding: 20px 16px;
    }

    .s39-why-grid .s39-why-card h4 {
        font-size: 18px;
    }

    .s39-why-grid .s39-why-card ul li {
        font-size: 15px;
    }

    .s39-why-grid .s39-why-card .s39-card-icon {
        font-size: 26px;
        width: 44px;
        height: 44px;
        line-height: 44px;
    }

    .s39-feature-block .s39-feature-title {
        font-size: 20px;
    }

    .s39-feature-list li {
        font-size: 15px;
        padding: 6px 0 6px 24px;
    }

    .s39-feature-list li::before {
        font-size: 14px;
        top: 6px;
        left: 4px;
    }

    .s39-why-sync h3 {
        font-size: 20px;
    }

    .s39-why-sync p {
        font-size: 16px;
    }
}