/* shared_css: This stylesheet contains global styles for the entire website. */
body {
    font-family: 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html {
    scroll-behavior: smooth;
}

*, *::before, *::after {
    box-sizing: border-box;
}

a {
    color: #007bff;
    text-decoration: none;
    transition: color 0.3s ease, text-decoration 0.3s ease;
}

a:hover {
    color: #0056b3;
    text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
    color: #343a40;
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

p {
    margin-top: 0;
    margin-bottom: 1rem;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.btn {
    display: inline-block;
    font-weight: 400;
    color: #fff;
    text-align: center;
    vertical-align: middle;
    user-select: none;
    background-color: #007bff;
    border: 1px solid #007bff;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.btn:hover {
    color: #fff;
    background-color: #0056b3;
    border-color: #004085;
    text-decoration: none;
}

.section-heading {
    text-align: center;
    margin-bottom: 4rem;
    font-size: 2.5rem;
    color: #343a40;
    position: relative;
    padding-bottom: 15px;
}

.section-heading::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: #007bff;
    margin: 10px auto 0;
    border-radius: 2px;
}

.card {
    background-color: #ffffff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    padding: 25px;
    margin-bottom: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
}

/* Utility classes */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.py-5 { padding-top: 3rem; padding-bottom: 3rem; }
.pb-5 { padding-bottom: 3rem; }

/* Responsive adjustments */
@media (max-width: 992px) {
    .section-heading {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }
    .section-heading {
        font-size: 1.8rem;
        margin-bottom: 3rem;
    }
    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    body {
        font-size: 14px;
    }
    h1 {
        font-size: 2rem;
    }
    h2 {
        font-size: 1.75rem;
    }
    .section-heading {
        font-size: 1.5rem;
        margin-bottom: 2rem;
    }
}

/* Accessibility improvements */
:focus {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

/* Custom scrollbar for better UX */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}
/* 移动端内容区防溢出（系统追加，请勿删除） */
@media (max-width: 768px) {
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}