@charset "utf-8";
/* CSS Document */

  :root {
        --bg-main: #fafafa;
        --card-bg: #ffffff;
        --text-dark: #0f172a;
        --text-gray: #64748b;
        --accent-green: #059669; /* 高端能源绿 */
        --accent-green-hover: #047857;
        --accent-green-light: #ecfdf5;
        --border-color: #e2e8f0;
        --shadow-soft: 0 4px 20px rgba(0,0,0,0.04);
        --shadow-hover: 0 16px 32px rgba(5,150,105,0.12);
    }

    .ess-portfolio-wrap {
        background-color: var(--bg-main);
        color: var(--text-dark);
        font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
        line-height: 1.5;
        padding-bottom: 120px;
    }

    .ess-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 24px;
    }

    /* Header 标语 */
    .ess-hero {
        text-align: center;
        padding: 60px 0 32px;
    }
    .ess-hero-tag {
        font-size: 13px;
        font-weight: 700;
        color: var(--accent-green);
        text-transform: uppercase;
        letter-spacing: 2px;
        margin-bottom: 12px;
    }
    .ess-hero h1 {
        font-size: 48px;
        font-weight: 800;
        letter-spacing: -1.5px;
        color: var(--text-dark);
        margin-bottom: 16px;
    }
    .ess-hero p {
        font-size: 18px;
        color: var(--text-gray);
        max-width: 640px;
        margin: 0 auto;
    }

    /* 优化后的吸顶导航 - 大字体 + 绿色高亮胶囊 */
    .ess-main-tabs {
        display: flex;
        justify-content: center;
        gap: 16px;
        padding: 16px 0;
        
        position: -webkit-sticky;
        position: sticky;
        top: 80px; /* 请开发根据网站 Header 实际高度设置偏移量，例如 70px */
        z-index: 999;
        
        background-color: rgba(250, 250, 250, 0.95);
        border-bottom: 1px solid var(--border-color);
        will-change: transform;
    }

    /* 一级分类按钮：显眼绿底大胶囊 */
    .ess-tab-btn1 {
        background: #ffffff;
        border: 2px solid var(--border-color);
        font-size: 18px;
        font-weight: 700;
        color: var(--text-dark);
        padding: 12px 28px;
        border-radius: 40px;
        cursor: pointer;
        white-space: nowrap;
        transition: all 0.25s ease-in-out;
        box-shadow: 0 2px 6px rgba(0,0,0,0.02);
    }

    .ess-tab-btn1:hover {
        border-color: var(--accent-green);
        color: var(--accent-green);
        transform: translateY(-2px);
    }

    /* 选中状态：绿色背景 + 白字 + 绿光阴影 */
    .ess-tab-btn1.active {
        background-color: var(--accent-green) !important;
        border-color: var(--accent-green) !important;
        color: #ffffff !important;
        box-shadow: 0 6px 20px rgba(5, 150, 105, 0.35);
    }

    /* 二级胶囊筛选 */
    .ess-sub-filter {
        display: flex;
        justify-content: center;
        gap: 10px;
        padding: 16px 0;
        margin-bottom: 32px;
        
        position: -webkit-sticky;
        position: sticky;
        top: 160px; /* 避开一级分类的高度（Header高度 + 一级分类高度） */
        z-index: 998;
        
        background-color: rgba(250, 250, 250, 0.95);
        will-change: transform;
    }

    .ess-sub-filter.hidden {
        display: none !important;
    }

    .ess-sub-btn {
        background: #f1f5f9;
        border: 1px solid #e2e8f0;
        color: var(--text-gray);
        font-size: 14px;
        font-weight: 600;
        padding: 8px 20px;
        border-radius: 30px;
        cursor: pointer;
        white-space: nowrap;
        transition: all 0.2s ease;
    }

    .ess-sub-btn:hover {
        color: var(--text-dark);
        background: #e2e8f0;
    }

    .ess-sub-btn.active {
        background: var(--text-dark);
        border-color: var(--text-dark);
        color: #ffffff;
    }

    /* 网格与卡片 */
    .ess-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
        gap: 32px;
        min-height: 400px;
    }

    .ess-card {
        background: var(--card-bg);
        border: 1px solid var(--border-color);
        border-radius: 20px;
        padding: 32px 28px;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        box-shadow: var(--shadow-soft);
        transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .ess-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-hover);
        border-color: var(--accent-green);
    }

    .ess-card.hidden {
        display: none !important;
    }

    .ess-visual {
        height: 200px;
        margin-bottom: 20px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .ess-visual img {
        max-height: 100%;
        max-width: 100%;
        object-fit: contain;
    }

    .ess-cate {
        font-size: 12px;
        font-weight: 700;
        color: var(--accent-green);
        text-transform: uppercase;
        letter-spacing: 1px;
        margin-bottom: 6px;
    }

    .ess-title {
        font-size: 20px;
        font-weight: 700;
        color: var(--text-dark);
        margin-bottom: 8px;
    }

    .ess-desc {
        font-size: 14px;
        color: var(--text-gray);
        margin-bottom: 20px;
        line-height: 1.5;
    }

    .ess-single-spec {
        border-top: 1px dashed var(--border-color);
        padding-top: 16px;
        margin-bottom: 16px;
    }

    .ess-spec-val {
        font-size: 26px;
        font-weight: 800;
        color: var(--text-dark);
    }

    .ess-link {
        font-size: 16px;
        font-weight: 700;
        color: var(--accent-green);
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }

    /* 移动端适配 */
    @media (max-width: 768px) {
        .ess-hero h1 { font-size: 32px; }
        .ess-main-tabs {
            justify-content: flex-start;
            overflow-x: auto;
            padding: 12px 16px;
            gap: 10px;
        }
        .ess-tab-btn {
            font-size: 15px;
            padding: 8px 18px;
        }
        .ess-grid { grid-template-columns: 1fr; }
    }

   @media (max-width: 768px) {
        .ess-main-tabs{top:60px}
        .ess-sub-filter{top:160px}
    }