body {
    background-color: #e9ecef;
}

:root {
    --primary: #15336e;
    --secondary: #866A2D;
    --accent: #f7b733;
    --light: #f8f9fa;
    --dark: #343a40;
    --gray: #6c757d;
    --light-gray: #e9ecef;
    --transition: all 0.3s ease;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.15);
}


.w {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 20px;
}

.space {
    height: 60px;
}

.header-placeholder {
    height: 80px;
    background: linear-gradient(to right, var(--primary), #2a5298);
}

/* 页面标题区域 */
.page-banner {
    position: relative;
    height: 50vh;
    min-height: 350px;
    overflow: hidden;
    border-radius: 0 0 20px 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(#15336e45, #15336e66), url('/static/image/about.jpeg');
    background-size: cover;
    background-position: center;
}

.banner-content {
    text-align: center;
    color: white;
    max-width: 800px;
    padding: 0 20px;
}

.banner-content h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.banner-content p {
    font-size: 1.4rem;
    opacity: 0.9;
    margin-bottom: 30px;
}

.banner-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

.btn {
    padding: 14px 35px;
    background: linear-gradient(to right, var(--secondary), var(--accent));
    color: #fff;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(134, 106, 45, 0.4);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--accent);
}

/* 平台概述区域 */
.platform-overview {
    padding: 55px 0;
    /*background: white;*/
    position: relative;
    overflow: hidden;
    background-image:  url(/static/image/about.jpg);
    border-radius: 20px;
    margin-top: 25px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary);
    position: relative;
    display: inline-block;
    padding-bottom: 15px;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--secondary);
    border-radius: 2px;
}

.section-header p {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 700px;
    margin: 20px auto 0;
}

.overview-content {
    display: flex;
    align-items: flex-start;
    gap: 50px;
    flex-direction: row;
}

.overview-text {
    flex: 1;
    margin: 16px auto;
}

.overview-text p {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--dark);
    margin-bottom: 25px;
}

.overview-image {
    flex: 1;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.overview-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
}

.overview-image:hover img {
    transform: scale(1.03);
}

/* 核心功能区域 */
.features-section {
    padding: 80px 0;
    background: linear-gradient(to bottom, #f8f9fa, #e9ecef);
    position: relative;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    height: 120px;
    background: linear-gradient(to right, var(--primary), #2a5298);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    color: var(--accent);
}

.feature-content {
    padding: 30px;
}

.feature-content h3 {
    font-size: 1.6rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.feature-content p {
    color: var(--gray);
    line-height: 1.7;
}

/* 平台优势区域 */
.advantages-section {
    padding: 80px 0;
    background: white;
}

.advantages-container {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    margin-top: 50px;
}

.advantage-item {
    flex: 1;
    min-width: 300px;
    display: flex;
    gap: 20px;
}

.advantage-number {
    min-width: 60px;
    height: 60px;
    background: var(--secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.8rem;
    font-weight: bold;
}

.advantage-content h3 {
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.advantage-content p {
    color: var(--gray);
    line-height: 1.7;
}

/* 技术架构区域 */
.architecture-section {
    padding: 80px 0;
    background: linear-gradient(rgba(26, 42, 108, 0.95), rgba(26, 42, 108, 0.95));
    color: white;
}

.architecture-content {
    display: flex;
    gap: 50px;
    align-items: center;
}

.architecture-image {
    flex: 1;
    text-align: center;
}

.architecture-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
}

.architecture-text {
    flex: 1;
}

.architecture-text h3 {
    font-size: 2rem;
    margin-bottom: 25px;
    color: var(--accent);
}

.architecture-text ul {
    list-style: none;
}

.architecture-text li {
    position: relative;
    padding-left: 30px;
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.7;
}

.architecture-text li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
    font-size: 1.2rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .overview-content {
        flex-direction: column;
    }

    .banner-content h1 {
        font-size: 2.8rem;
    }

    .banner-content p {
        font-size: 1.2rem;
    }
}

@media (max-width: 768px) {
    .page-banner {
        height: 40vh;
    }

    .banner-content h1 {
        font-size: 2.2rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .banner-buttons {
        flex-direction: column;
        align-items: center;
    }

    .architecture-content {
        flex-direction: column;
    }
}

@media (max-width: 576px) {
    .banner-content h1 {
        font-size: 1.8rem;
    }

    .section-header h2 {
        font-size: 1.7rem;
    }

    .feature-card {
        min-width: 100%;
    }
}

.titleh2 {
    font-size: 26px;
    font-weight: bold;
    color: #293040;
    /*background: linear-gradient(#15336e45, #15336e66), url('/static/image/logo.png');*/
    background-image: url(/static/image/block.png);
    background-repeat: no-repeat;
    height: 54px;
    background-position: top left;
    padding: 0 0 0 60px;
    line-height: 60px;
    background-size: 47px auto;
    margin: 15px auto;
}

.btnabout {
    display: inline-block;
    padding: 15px 73px;
    background-color: #374b7b;
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

:root {
    --primary: #2b418e;
    --secondary: #4361ee;
    --light-gray: #f5f7fa;
    --transition-base: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* 基础动画设置 */
.animate-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 导航栏滚动效果 */
header {
    transition: background-color 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
}
header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.1);
}

/* Banner区域动画 */
.page-banner {
    position: relative;
    overflow: hidden;
}
.banner-content {
    opacity: 0;
    transform: translateY(30px);
    animation: bannerFade 1.2s ease forwards 0.5s;
}
@keyframes bannerFade {
    to { opacity: 1; transform: translateY(0); }
}

/* 概述区域动画 */
.overview-content {
    display: flex;
    gap: 30px;
}
.overview-text {
    transition: var(--transition-base);
}
.overview-text:hover {
    transform: translateY(-5px);
}

/* 按钮动画 */
.btnabout {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    z-index: 1;
}
.btnabout::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150%;
    height: 150%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%) scale(0);
    border-radius: 50%;
    transition: transform 0.6s ease;
    z-index: -1;
}
.btnabout:hover::after {
    transform: translate(-50%, -50%) scale(1);
}
.btnabout:hover {
    background-color: var(--secondary);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(43, 65, 142, 0.3);
}

/* 功能卡片动画 */
.feature-card {
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary), var(--accent));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}
.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}
.feature-card:hover::before {
    transform: scaleX(1);
}
.feature-icon {
    transition: var(--transition-base);
}
.feature-card:hover .feature-icon {
    transform: scale(1.2);
    color: var(--accent);
}

/* 优势项目动画 */
.advantage-item {
    transition: var(--transition-base);
    position: relative;
}
.advantage-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: width 0.3s ease;
}
.advantage-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow);
}
.advantage-item:hover::after {
    width: 100%;
}
.advantage-number {
    transition: var(--transition-base);
}
.advantage-item:hover .advantage-number {
    background-color: var(--accent);
    transform: scale(1.1);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .overview-content {
        flex-direction: column;
    }
}