/* Global Styles */
body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: #333;
    background-color: #f4f7f6;
}

:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --breakpoint-xs: 0;
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-sm: 0.875rem;
    --line-height-base: 1.5;
    --border-radius: 0.25rem;
    --box-shadow: 0 .125rem .25rem rgba(0,0,0,.075);
    --transition-base: all .2s ease-in-out;
}

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-base);
}
a:hover {
    color: #0056b3;
    text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-weight: 600;
    line-height: 1.2;
    color: var(--dark-color);
}

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

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

.container {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: var(--breakpoint-sm)) {
    .container {
        max-width: 540px;
    }
}
@media (min-width: var(--breakpoint-md)) {
    .container {
        max-width: 720px;
    }
}
@media (min-width: var(--breakpoint-lg)) {
    .container {
        max-width: 960px;
    }
}
@media (min-width: var(--breakpoint-xl)) {
    .container {
        max-width: 1140px;
    }
}

.btn {
    display: inline-block;
    font-weight: 400;
    color: #212529;
    text-align: center;
    vertical-align: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: .375rem .75rem;
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    border-radius: var(--border-radius);
    transition: var(--transition-base);
}

.btn-primary {
    color: #fff;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}
.btn-primary:hover {
    color: #fff;
    background-color: #0069d9;
    border-color: #0062cc;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 15px;
}
.section-title h2 {
    font-size: 2.5rem;
    color: var(--dark-color);
    font-weight: 700;
}
.section-title p {
    font-size: var(--font-size-lg);
    color: var(--secondary-color);
}
.section-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

/* Utility Classes */
.text-center {
    text-align: center;
}
.text-left {
    text-align: left;
}
.text-right {
    text-align: right;
}
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.mt-1 { margin-top: 0.25rem !important; }
.mb-1 { margin-bottom: 0.25rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mt-3 { margin-top: 1rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.mt-5 { margin-top: 3rem !important; }
.mb-5 { margin-bottom: 3rem !important; }

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

.bg-light {
    background-color: var(--light-color) !important;
}

.shadow-sm {
    box-shadow: 0 .125rem .25rem rgba(0,0,0,.075) !important;
}

.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: border-box;
    border: 1px solid rgba(0,0,0,.125);
    border-radius: var(--border-radius);
}
.card-body {
    flex: 1 1 auto;
    min-height: 1px;
    padding: 1.25rem;
}
.card-title {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}
.card-text:last-child {
    margin-bottom: 0;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -15px;
    margin-left: -15px;
}
.col-md-4, .col-lg-3 {
    position: relative;
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
}

@media (min-width: 768px) {
    .col-md-4 {
        flex: 0 0 33.333333%;
        max-width: 33.333333%;
    }
}

@media (min-width: 992px) {
    .col-lg-3 {
        flex: 0 0 25%;
        max-width: 25%;
    }
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}
.form-control {
    display: block;
    width: 100%;
    padding: .375rem .75rem;
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: var(--border-radius);
    transition: border-color .15s ease-in-out,box-shadow .15s ease-in-out;
}
.form-control:focus {
    color: #495057;
    background-color: #fff;
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 .2rem rgba(0,123,255,.25);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.fade-in {
    animation: fadeIn 1s ease-out;
}

@keyframes slideInUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}
.slide-in-up {
    animation: slideInUp 0.8s ease-out;
}

/* Responsive Utilities */
.d-none {
    display: none !important;
}
@media (min-width: var(--breakpoint-md)) {
    .d-md-block {
        display: block !important;
    }
}

/* Custom Components */
.hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('/images/hero-bg.jpg') no-repeat center center;
    background-size: cover;
    color: white;
    padding: 100px 0;
    text-align: center;
}
.hero-section h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: white;
}
.hero-section p {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.icon-box {
    text-align: center;
    padding: 30px;
    background: #fff;
    border-radius: 8px;
    margin-bottom: 30px;
    box-shadow: var(--box-shadow);
    transition: var(--transition-base);
}
.icon-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 .25rem .5rem rgba(0,0,0,.1);
}
.icon-box i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
}
.icon-box h4 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 15px;
}
.icon-box p {
    font-size: 15px;
    color: #666;
}

/* Additional common styles */
.section-padding {
    padding: 80px 0;
}

.text-primary {
    color: var(--primary-color) !important;
}

.bg-primary {
    background-color: var(--primary-color) !important;
}

.list-unstyled {
    padding-left: 0;
    list-style: none;
}

/* Media Queries for general adjustments */
@media (max-width: 768px) {
    .section-title h2 {
        font-size: 2rem;
    }
    .hero-section h1 {
        font-size: 2.5rem;
    }
    .hero-section p {
        font-size: 1.2rem;
    }
    .py-5 {
        padding-top: 2rem !important;
        padding-bottom: 2rem !important;
    }
}
/* 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;
  }
}