/* 全局样式 */
:root {
    --primary-color: #4e73df;
    --secondary-color: #f8f9fc;
    --dark-color: #333;
    --light-color: #f8f9fc;
    --success-color: #1cc88a;
    --info-color: #36b9cc;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --purple-color: #8a63d2;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: #333;
    line-height: 1.6;
    padding-top: 100px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: #2e59d9;
}

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

.bg-gradient {
    background: linear-gradient(180deg, var(--secondary-color) 0%, #fff 100%);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
}

.section-subtitle {
    font-size: 1.1rem;
    color: #6c757d;
    margin-bottom: 2rem;
}

.btn {
    border-radius: 0.25rem;
    padding: 0.5rem 1.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background-color: #2e59d9;
    border-color: #2e59d9;
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
}

/* 顶部导航栏 */
.navbar {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
}

.navbar-brand h1 {
    font-weight: 700;
    margin-bottom: 0;
}

.nav-link {
    font-weight: 600;
    padding: 0.5rem 1rem !important;
    color: var(--dark-color) !important;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color) !important;
}

.quick-nav {
    background-color: #f8f9fc;
    border-bottom: 1px solid #eaecf4;
}

.quick-link {
    color: #6c757d;
    margin-right: 1rem;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.quick-link:hover {
    color: var(--primary-color);
    text-decoration: none;
}

/* Banner区域 */
.banner-section {
    padding: 4rem 0;
    background-color: #fff;
}

.banner-stat {
    padding: 1rem;
    border-radius: 0.5rem;
    background-color: #fff;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    flex: 1;
    min-width: 120px;
    text-align: center;
}

.banner-image {
    position: relative;
    padding: 2rem;
}

.banner-icon {
    font-size: 10rem;
    opacity: 0.2;
}

.banner-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.animation-icon {
    font-size: 2rem;
    position: absolute;
    animation: float 3s infinite ease-in-out;
}

.animation-icon:nth-child(1) {
    top: 30%;
    left: 30%;
    animation-delay: 0s;
}

.animation-icon:nth-child(2) {
    top: 40%;
    right: 30%;
    animation-delay: 1s;
}

.animation-icon:nth-child(3) {
    bottom: 30%;
    left: 40%;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-15px);
    }
}

/* 功能卡片 */
.feature-card {
    background-color: #fff;
    border-radius: 0.5rem;
    padding: 2rem;
    height: 100%;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: all 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.feature-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.feature-text {
    color: #6c757d;
    margin-bottom: 0;
}

/* 检测流程 */
.process-timeline {
    position: relative;
    padding: 2rem 0;
}

.process-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background-color: var(--primary-color);
}

.process-step {
    position: relative;
    margin-bottom: 4rem;
    display: flex;
    align-items: center;
}

.process-step:last-child {
    margin-bottom: 0;
}

.process-number {
    width: 3rem;
    height: 3rem;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    z-index: 1;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.process-content {
    width: 45%;
    padding: 1.5rem;
    background-color: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    margin-right: auto;
}

.process-icon {
    width: 45%;
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-color);
}

.process-step:nth-child(even) .process-content {
    margin-left: auto;
    margin-right: 0;
    order: 2;
}

.process-step:nth-child(even) .process-icon {
    order: 1;
}

/* 检测系统卡片 */
.system-card {
    background-color: #fff;
    border-radius: 0.5rem;
    padding: 1.5rem;
    height: 100%;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: all 0.3s ease;
}

.system-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
}

.system-logo {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.system-logo i {
    font-size: 2rem;
    margin-right: 0.5rem;
}

.system-logo span {
    font-size: 1.2rem;
    font-weight: 700;
}

.system-name {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.system-desc {
    color: #6c757d;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    min-height: 3rem;
}

.system-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.system-features span {
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
    background-color: #f8f9fc;
    border-radius: 1rem;
    white-space: nowrap;
}

/* 对比表格 */
.comparison-table {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.comparison-table th,
.comparison-table td {
    text-align: center;
    vertical-align: middle;
}

.comparison-table th {
    font-weight: 700;
}

.comparison-notes {
    font-size: 0.95rem;
}

/* 降AI率方法卡片 */
.method-card {
    background-color: #fff;
    border-radius: 0.5rem;
    padding: 2rem;
    height: 100%;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: all 0.3s ease;
}

.method-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
}

.method-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.method-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.method-desc {
    color: #6c757d;
    margin-bottom: 1rem;
}

.method-list {
    padding-left: 1.5rem;
}

.method-list li {
    margin-bottom: 0.5rem;
}

.ai-ratio-chart {
    height: 100%;
}

.professional-service {
    height: 100%;
}

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

.service-features li {
    margin-bottom: 0.75rem;
}

/* 用户评价 */
.testimonial-card {
    background-color: #fff;
    border-radius: 0.5rem;
    padding: 2rem;
    height: 100%;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
}

.testimonial-rating {
    margin-bottom: 1rem;
}

.testimonial-text {
    font-style: italic;
    color: #6c757d;
    margin-bottom: 1.5rem;
    min-height: 100px;
}

.testimonial-user {
    display: flex;
    align-items: center;
}

.testimonial-avatar {
    font-size: 2.5rem;
    color: #6c757d;
    margin-right: 1rem;
}

.testimonial-name {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.testimonial-position {
    font-size: 0.8rem;
    color: #6c757d;
}

.stats-container {
    margin-top: 3rem;
}

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

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: #6c757d;
    font-size: 0.9rem;
}

/* FAQ手风琴 */
.accordion-button {
    font-weight: 600;
}

.accordion-button:not(.collapsed) {
    background-color: var(--primary-color);
    color: #fff;
}

.accordion-button:not(.collapsed)::after {
    filter: brightness(0) invert(1);
}

/* 关于我们 */
.about-list {
    list-style: none;
    padding-left: 0;
}

.about-list li {
    margin-bottom: 0.75rem;
}

.partner-logo {
    display: inline-flex;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.9rem;
}

.partner-logo i {
    margin-right: 0.5rem;
}

.about-card {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 0.5rem;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.about-card-header {
    background-color: rgba(255, 255, 255, 0.2);
    padding: 1rem;
    font-weight: 700;
    color: #fff;
}

.about-card-body {
    padding: 1.5rem;
}

.achievement-item {
    text-align: center;
    padding: 1rem;
    background-color: #f8f9fc;
    border-radius: 0.5rem;
}

.achievement-number {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.achievement-label {
    font-size: 0.85rem;
    color: #6c757d;
}

.certification-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.certification-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #fff;
}

.certification-item i {
    color: var(--warning-color);
}

/* 联系我们 */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.contact-icon {
    font-size: 2rem;
    color: var(--primary-color);
}

.contact-text h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.social-link:hover {
    background-color: #2e59d9;
    color: #fff;
    transform: translateY(-5px);
}

/* 页脚 */
.footer {
    background-color: #212529;
}

.footer-brand h3 {
    color: #fff;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.6);
}

.footer-heading {
    color: #fff;
    font-size: 1.1rem;
    position: relative;
    padding-bottom: 0.75rem;
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--primary-color);
}

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

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: #fff;
    text-decoration: none;
    padding-left: 5px;
}

.footer-contact {
    color: rgba(255, 255, 255, 0.6);
}

.footer-statement {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.85rem;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3rem;
    height: 3rem;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

.back-to-top:hover {
    background-color: #2e59d9;
    color: #fff;
    transform: translateY(-5px);
}

/* 响应式调整 */
@media (max-width: 991.98px) {
    .process-timeline::before {
        left: 2rem;
    }
    
    .process-number {
        left: 2rem;
        transform: none;
    }
    
    .process-step {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .process-content, 
    .process-step:nth-child(even) .process-content {
        width: 100%;
        margin-left: 4rem;
        margin-right: 0;
        order: 2;
    }
    
    .process-icon, 
    .process-step:nth-child(even) .process-icon {
        width: 100%;
        margin-left: 4rem;
        text-align: left;
        margin-bottom: 1rem;
        order: 1;
    }
}

@media (max-width: 767.98px) {
    .section-title {
        font-size: 2rem;
    }
    
    .banner-section {
        padding: 2rem 0;
    }
}