/* General Body Styles */
body {
    font-family: 'Inter', 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    box-sizing: border-box;
}

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

/* Container for Centering Content */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 25px;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    color: #2c3e50;
    margin-top: 0;
    margin-bottom: 0.8em;
    font-weight: 700;
}

h1 { font-size: 3.2em; line-height: 1.2; }
h2 { font-size: 2.5em; line-height: 1.3; }
h3 { font-size: 2em; line-height: 1.4; }
h4 { font-size: 1.75em; line-height: 1.5; }
h5 { font-size: 1.5em; }
h6 { font-size: 1.25em; }

/* Paragraphs */
p {
    margin-bottom: 1em;
}

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

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 25px;
    font-size: 17px;
    font-weight: 600;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: 8px;
    transition: all 0.3s ease;
    user-select: none;
}

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

.btn-primary:hover {
    color: #fff;
    background-color: #0056b3;
    border-color: #0056b3;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.2);
}

.btn-secondary {
    color: #333;
    background-color: #e9ecef;
    border-color: #e2e6ea;
}

.btn-secondary:hover {
    color: #333;
    background-color: #d3d9df;
    border-color: #c6cdd3;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

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

.btn-outline-primary:hover {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.2);
}

/* Forms */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
textarea,
select {
    display: block;
    width: 100%;
    padding: 12px 15px;
    font-size: 16px;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.375rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

input:focus,
textarea:focus,
select:focus {
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(0, 123, 255, 0.25);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }
.py-20 { padding-top: 20px; padding-bottom: 20px; }
.py-30 { padding-top: 30px; padding-bottom: 30px; }
.px-20 { padding-left: 20px; padding-right: 20px; }

/* Visually hidden for accessibility */
.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
    word-wrap: normal !important;
}

/* Font Awesome integration (assuming CDN or local import) */
.fas, .fab {
    font-family: 'Font Awesome 5 Free'; /* Or specific FA font */
    font-weight: 900; /* For solid icons */
}
.fab { font-weight: 400; /* For brand icons */ }

/* Responsive adjustments for smaller screens */
@media (max-width: 992px) {
    .container {
        padding: 0 20px;
    }
    h1 { font-size: 2.8em; }
    h2 { font-size: 2.2em; }
    h3 { font-size: 1.8em; }
    .btn { padding: 10px 20px; font-size: 15px; }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    h1 { font-size: 2.2em; }
    h2 { font-size: 1.8em; }
    h3 { font-size: 1.5em; }
    h4 { font-size: 1.3em; }
    .btn { padding: 8px 18px; font-size: 14px; }
}

@media (max-width: 480px) {
    h1 { font-size: 1.8em; }
    h2 { font-size: 1.5em; }
    h3 { font-size: 1.3em; }
    p { font-size: 0.95em; }
}
/* 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;
  }
}