/*:root {*/
/*  --primary-color: #167537;*/
/*  --primary-dark: #4DA1A9;*/
/*  --primary-light: #E8F8F5;*/
/*  --secondary-color: #3498DB;*/
/*  --accent-color: #E67E22;*/
/*  --success-color: #2ecc71;*/
/*  --success-dark: #27ae60;*/
/*  --text-color: #2C3E50;*/
/*  --light-bg: #F9F9F9;*/
/*  --white: #FFFFFF;*/
/*  --gray: #95A5A6;*/
/*  --dark-gray: #444;*/
/*  --light-gray: #f5f5f5;*/
/*  --medium-gray: #666;*/
/*  --dark-medium-gray: #333;*/
/*  --light-border: #ddd;*/
/*  --dark-border: #999;*/
/*}*/

:root {
    --primary-color: #167537;
    --primary-dark: #0A365F;
    --primary-light: #E6F0FA;
    --secondary-color: #2980B9;
    --accent-color: #E4A11B;
    --success-color: #5f8171;
    --success-dark: #4CAF50;
    --text-color: #1E293B;
    --light-bg: #F8FAFC;
    --white: #FFFFFF;
    --gray: #64748B;
    --dark-gray: #334155;
    --light-gray: #E2E8F0;
    --medium-gray: #475569;
    --dark-medium-gray: #1E293B;
    --light-border: #CBD5E1;
    --dark-border: #94A3B8;
}


/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    scroll-behavior: smooth;
    background-color: var(--white);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-fluid {
    max-width: 100%;
    padding: 0 30px;
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s;
    font-size: 1.1rem;
    font-weight: bold;
    border: 2px solid var(--primary-color);
    cursor: pointer;
}

.btn:hover {
    background-color: var(--white);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* Cards */
.card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.card-img {
    width: 100%;
    height: 300px;
    object-fit: cover;
}

.card-content {
    padding: 1.5rem;
}

.card-content h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.card-content p {
    color: var(--gray);
    margin-bottom: 1rem;
}

/* Grid layouts */
.grid-2-cols {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.grid-3-cols {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
}

.grid-4-cols {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.grid-4-cols .card {
    max-width: 100%;
}

/* Sections */
.section {
    padding: 3rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.2rem;
    color: var(--primary-color);
}

/* Page header */
.page-header {
    background-color: var(--light-bg);
    padding: 3rem 0;
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: var(--white);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    text-decoration: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
}

/* Responsive design */
@media (max-width: 1200px) and (min-width: 993px) {
    .container-fluid {
        padding: 0 20px;
    }

    .main-content {
        padding: 0 20px;
    }

    .grid-4-cols {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

/* iPad Pro, Surface Pro 7 and other medium-sized devices */
@media (max-width: 1024px) and (min-width: 912px) {
    .container-fluid {
        padding: 0 20px;
    }

    .main-content {
        padding: 0 20px;
    }

    .grid-4-cols {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .grid-3-cols {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

@media (max-width: 992px) {
    .container-fluid {
        padding: 0 15px;
    }

    .main-content {
        padding: 0 15px;
    }

    .page-header {
        padding: 1.5rem 0;
        margin-bottom: 1.5rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .section {
        padding: 1.5rem 0;
    }

    .section-title {
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
    }

    .grid-2-cols,
    .grid-3-cols,
    .grid-4-cols {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {

    .card-content {
        padding: 0.5rem;
    }

    .page-header {
        padding: 1.5rem 0;
        margin-bottom: 1.5rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .section {
        padding: 0.5rem 0;
    }

    .section-title {
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
    }

    .grid-2-cols,
    .grid-3-cols,
    .grid-4-cols {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .main-content {
        flex-direction: column;
    }
}