:root {
    --primary: #1a5276;
    --secondary: #3498db;
    --accent: #e74c3c;
    --light: #f8f9fa;
    --dark: #212529;
    --text: #495057;
    --border: #dee2e6;
    --highlight: #e9ecef;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.8;
    color: var(--text);
    background-color: #f5f7fb;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 40px 30px;
}

header {
    text-align: center;
    margin-bottom: 60px;
    padding: 50px 0;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-radius: 10px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    font-weight: 600;
    letter-spacing: 1px;
}

.subtitle {
    font-size: 1.3rem;
    font-weight: 300;
    margin: 0 auto;
    opacity: 0.9;
}

.report-section {
    margin-bottom: 70px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    padding: 50px;
    position: relative;
    overflow: hidden;
    border-left: 5px solid var(--accent);
}

h2 {
    color: var(--primary);
    font-size: 2rem;
    margin-top: 0;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border);
    position: relative;
}

h2:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 150px;
    height: 3px;
    background: var(--accent);
}

h3 {
    color: var(--secondary);
    font-size: 1.5rem;
    margin-top: 40px;
    margin-bottom: 20px;
    padding-left: 15px;
    border-left: 4px solid var(--accent);
}

.report-section p {
    font-size: 1.1rem;
    color: var(--text);
    margin-bottom: 20px;
}

ul, ol {
    padding-left: 30px;
}

.before {
    margin-bottom: 12px;
    position: relative;
    color: var(--text);
    padding-left: 25px;
}

.before:before {
    content: '•';
    color: var(--accent);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.image-container {
    text-align: center;
    margin: 40px 0;
}

.image-container img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border: 1px solid var(--border);
}

.case-study {
    background: var(--light);
    border-radius: 8px;
    padding: 30px;
    margin: 40px 0;
    border: 1px solid var(--border);
    position: relative;
}

.case-study:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
}

.case-header {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.case-title {
    font-size: 1.4rem;
    color: var(--primary);
    font-weight: 600;
    margin: 0 0 10px 0;
}

.case-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 15px;
}

.meta-item {
    background: rgba(52, 152, 219, 0.1);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--secondary);
}

.meta-item strong {
    color: var(--primary);
}

.feature-list {
    margin: 25px 0;
}

.feature-item {
    display: flex;
    margin-bottom: 15px;
    align-items: flex-start;
}

.feature-icon {
    color: var(--accent);
    margin-right: 15px;
    font-size: 1.2rem;
    line-height: 1;
    margin-top: 3px;
}

footer {
    text-align: center;
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
    color: var(--text);
    font-size: 0.95rem;
}

@media (max-width: 992px) {
    .container {
        padding: 30px 20px;
    }

    header {
        padding: 30px 20px;
        margin-bottom: 40px;
    }

    h1 {
        font-size: 2.2rem;
    }

    .report-section {
        padding: 30px;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.6rem;
    }

    .report-section {
        padding: 25px;
    }

    .case-meta {
        flex-direction: column;
        gap: 10px;
    }
}