/* shared_css: This CSS is shared across multiple pages and components. */
/* Base styles */
body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    color: #333;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
    line-height: 1.6;
}

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

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

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

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

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.py-40 {
    padding-top: 40px;
    padding-bottom: 40px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: #007bff;
    color: white;
}

.btn-primary:hover {
    background-color: #0056b3;
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
    box-shadow: 0 4px 8px rgba(108, 117, 125, 0.3);
}

.btn-outline-primary {
    background-color: transparent;
    color: #007bff;
    border: 2px solid #007bff;
}

.btn-outline-primary:hover {
    background-color: #007bff;
    color: white;
}

/* Cards */
.card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 30px;
    margin-bottom: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
}

.card-title {
    font-size: 24px;
    color: #34495e;
    margin-bottom: 15px;
}

.card-text {
    font-size: 16px;
    color: #555;
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

.form-label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #34495e;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box; /* Ensures padding doesn't increase width */
}

.form-control:focus {
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Alerts */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    border-radius: 4px;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: #2c3e50;
    margin-top: 0;
    margin-bottom: 0.5em;
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

p {
    margin-bottom: 1em;
}

a {
    color: #007bff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Media Queries for responsiveness */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .card {
        padding: 20px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .btn {
        width: 100%;
        text-align: center;
        margin-bottom: 10px;
    }

    .card {
        margin-left: 0;
        margin-right: 0;
    }
}

/* FontAwesome for icons, assuming it's loaded */
.fas, .fab {
    margin-right: 5px;
}

/* Additional common styles for layout */
.section {
    padding: 60px 0;
}

.section-dark {
    background-color: #34495e;
    color: #ecf0f1;
}

.section-light {
    background-color: #fdfdfe;
    color: #333;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

/* Scroll to top button (example) */
#scrollTopBtn {
    display: none; /* Hidden by default */
    position: fixed; /* Fixed position */
    bottom: 20px; /* Place the button at the bottom of the page */
    right: 30px; /* Place the button at the right */
    z-index: 99; /* Make sure it does not overlap */
    border: none; /* Remove borders */
    outline: none; /* Remove outline */
    background-color: #007bff; /* Set a background color */
    color: white; /* Text color */
    cursor: pointer; /* Add a mouse pointer on hover */
    padding: 15px; /* Some padding */
    border-radius: 10px; /* Rounded corners */
    font-size: 18px; /* Increase font size */
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

#scrollTopBtn:hover {
    background-color: #0056b3; /* Add a darker background on hover */
}

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

/* Clearfix for floats */
.clearfix::after {
    content: "";
    clear: both;
    display: table;
}
/* 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;
  }
}