/* 由 course_2026\C03_dljy_jcbf.html 的 <head> 内 <style> 抽取，勿在此文件外修改样式 */

    /* 沿用参考页所有样式，无新增/修改，保证UI统一 */
    body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        line-height: 1.6;
        color: #333;
        background-color: #f8f9fa;
    }

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

    .h1 {
        font-weight: 700;
        text-align: center;
        font-size: 28px;
        margin: 30px 0 20px;
        color: #1a6845;
    }

    h2 {
        font-weight: 600;
        margin: 1.8rem 0 1rem;
    }

    .course {
        max-width: 1200px;
        margin: 2rem auto;
        padding: 2.5rem;
        background: #fff;
        border-radius: 12px;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    }

    .course-title {
        font-size: 1.8rem;
        color: #1a6845;
        border-left: 4px solid #05af10;
        padding-left: 1.2rem;
        margin: 0 0 2.5rem;
        font-weight: 600;
    }

    .course-intro {
        background: linear-gradient(135deg, #f8faf9 0%, #f0f7f4 100%);
        padding: 2rem;
        border-radius: 10px;
        margin-bottom: 2.5rem;
        border: 1px solid #e6f2ed;
    }

    .intro-text {
        font-size: 16px;
        line-height: 1.8;
        color: #444;
        margin-bottom: 1.5rem;
    }

    .intro-highlight {
        color: #1a6845;
        font-weight: 500;
        background: rgba(5, 175, 16, 0.08);
        padding: 0.2rem 0.5rem;
        border-radius: 4px;
    }

    .intro-red-highlight {
        color: #e42d36;
        font-weight: 500;
        background: rgba(5, 175, 16, 0.08);
        padding: 0.2rem 0.5rem;
        border-radius: 4px;
    }


    .instructor-section {
        background: #f0f9ff;
        padding: 1.2rem;
        border-radius: 10px;
        margin: 1rem 0;
    }

    .instructor-title {
        color: #1a6845;
        font-weight: 600;
        margin-bottom: 1rem;
        font-size: 1.6rem;
    }

    .instructor-info {
        font-size: 15px;
        line-height: 1.7;
        color: #444;
    }

    .instructor-info strong {
        color: #2c8a5c;
    }

    .features-section {
        background: #fff9f0;
        padding: 1.8rem;
        border-radius: 10px;
        margin: 2rem 0;
        border: 1px solid #ffeacc;
    }

    .features-title {
        color: #d35400;
        font-weight: 600;
        margin-bottom: 1.2rem;
        font-size: 1.6rem;
    }

    .features-list {
        list-style-type: none !important;
        padding-left: 0;
    }

    .features-list li {
        padding: 0.5rem 0;
        padding-left: 1.8rem;
        position: relative;
        font-size: 15px;
        color: #555;
        line-height: 1.6;
        list-style-type: none !important;
        list-style: none !important;

    }

    .features-list li:before {
        content: "✓";
        position: absolute;
        left: 0;
        color: #05af10;
        font-weight: bold;
        list-style-type: none;
    }

    .course-meta {
        border-top: 1px dashed #ddd;
        padding-top: 1.8rem;
        margin-top: 2rem;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }

    .meta-item {
        margin: 0.5rem 0;
        font-size: 15px;
        color: #555;
        line-height: 1.5;
    }

    .meta-label {
        color: #2c8a5c;
        font-weight: 1000;
        display: inline-block;
        min-width: 100px;
    }

    .course-link-container {
        text-align: center;
        margin: 2rem 0;
    }

    .course-link {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        background: linear-gradient(135deg, #05af10 0%, #04850d 100%);
        color: white !important;
        padding: 0.8rem 2rem;
        border-radius: 8px;
        text-decoration: none;
        font-weight: 500;
        font-size: 16px;
        transition: all 0.3s ease;
        box-shadow: 0 4px 12px rgba(5, 175, 16, 0.2);
    }

    .course-link:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 16px rgba(5, 175, 16, 0.3);
        background: linear-gradient(135deg, #04850d 0%, #036c0b 100%);
    }

    .course-link:before {
        content: "▶";
        margin-right: 8px;
        font-size: 14px;
    }

    .section-title {
        font-size: 1.6rem;
        color: #1a6845;
        margin: 3rem 0 1.8rem;
        padding-bottom: 0.8rem;
        border-bottom: 2px solid #eee;
        font-weight: 600;
    }

    .curriculum-list {
        padding-left: 0;
    }

    .lesson-item {
        margin: 1.5rem 0;
        padding: 1.2rem;
        background: #f8faf9;
        border-radius: 8px;
        border-left: 4px solid #05af10;
        transition: all 0.3s ease;
    }

    .lesson-item:hover {
        background: #f0f7f4;
        transform: translateX(5px);
    }

    .lesson-order {
        display: inline-block;
        background: #05af10;
        color: white;
        width: 28px;
        height: 28px;
        border-radius: 50%;
        text-align: center;
        line-height: 28px;
        margin-right: 12px;
        font-weight: 600;
        font-size: 14px;
    }

    .lesson-title {
        font-weight: 600;
        color: #333;
        font-size: 17px;
        margin-bottom: 0.8rem;
    }

    .sub-lesson {
        margin: 0.5rem 0 0 0.5rem;
        padding: 0.5rem 1rem;
        background: #fff;
        border-radius: 6px;
        font-size: 15px;
        line-height: 1.6;
    }

    .sub-lesson.updated {
        border-left-color: #05af10;
        background: #f8fff8;
    }

    .sub-lesson.updated:before {
        content: "🟢 ";
        font-size: 12px;
        margin-right: 5px;
    }

    .live-badge {
        display: inline-block;
        background: #ff4757;
        color: white;
        font-size: 12px;
        padding: 2px 8px;
        border-radius: 12px;
        margin-left: 10px;
        vertical-align: middle;
        animation: pulse 2s infinite;
    }

    @keyframes pulse {
        0% {
            opacity: 1;
        }

        50% {
            opacity: 0.7;
        }

        100% {
            opacity: 1;
        }
    }

    .completion-notice {
        text-align: center;
        padding: 2rem;
        background: linear-gradient(135deg, #f1f8f5 0%, #e6f2ed 100%);
        border-radius: 10px;
        margin: 3rem 0;
        border: 1px solid #d4e6dd;
    }

    .notice-text {
        color: #05af10;
        font-weight: 600;
        font-size: 18px;
        letter-spacing: 1px;
    }

    .breadcrumb {
        font-size: 14px;
        padding: 15px 0;
        background: none;
        margin-bottom: 0;
    }

    .breadcrumb li a {
        color: #05af10;
        text-decoration: none;
    }

    .breadcrumb li.active {
        color: #666;
    }

    @media (max-width: 768px) {
        .course {
            padding: 1.5rem;
            margin: 1rem auto;
        }

        .h1 {
            font-size: 22px;
            margin: 20px 0 15px;
        }

        .course-title {
            font-size: 1.5rem;
        }

        .course-meta {
            grid-template-columns: 1fr;
        }

        .lesson-item {
            padding: 1rem;
        }

        .sub-lesson {
            margin-left: 1.5rem;
        }

        .instructor-section,
        .features-section {
            padding: 1.2rem;
        }
    }

    @media (max-width: 480px) {
        .container {
            padding: 0 15px;
        }

        .course {
            padding: 1rem;
        }

        .course-link {
            padding: 0.6rem 1.5rem;
            font-size: 14px;
        }

        .sub-lesson {
            margin-left: 1rem;
            padding: 0.6rem 0.8rem;
        }
    }