.wrapper {
    width: 90%;
    margin: 0 auto;
    box-sizing: border-box;
}

/* header */

.header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5% 0 2%;
    gap: 20px;
    background-color: #2D6B7D;
}

.header .logo {
    display: flex;
    flex: 1 1 auto;
    max-width: 55%;
    min-width: 0;
    align-items: center;
    margin: 0;
    border-radius: 20px;
    font-size: 120%;
    font-weight: 700;
}

.header .logo img {
    height: 80px;
    width: auto;
    object-fit: contain;
    display: block;
}

.header .logo .title {
    margin-left: 2%;
    width: auto;
    display: flex;
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
    flex-wrap: wrap;
    overflow: hidden;
}

.header .logo .title h3 {
    font-size: 110%;
    color: white;
    font-weight: 600;
    margin: 0;
    white-space: normal;
    line-height: 1.2;
}

.header .logo .title p {
    font-size: 80%;
    color: white;
    margin: 0;
    white-space: normal;
    line-height: 1.2;
}

.header .nev { 
    flex: 0 1 auto;
    height: 100%;
    min-width: 0;
}

.header .nev .nev-child-1 {
    display: flex;
    width: 100%;
    height: 100%;
    justify-content: flex-end;
    align-items: center;
}

.header .nev-child-1 li {
    padding: 1% 2%;
    border-radius: 10px;
    position: relative;
    list-style: none;
}

/* 鼠标悬停导航栏 */
.header li:hover a {
    color: black;
}
.header .icon-jiantou_shang {
    display: none;
}
.header li:hover .icon-jiantou_xia {
    display: none;
}
.header li:hover .icon-jiantou_shang {
    display: inline-block;
}

/* 箭头图标对齐样式 */
.header .icon-jiantou_xia,
.header .icon-jiantou_shang {
    font-size: 12px;
    vertical-align: middle;
    line-height: 1;
    margin-left: 4px;
}

.header a {
    font-size: 150%;
    font-weight: 700;
    color: white;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.header .nev-child-2 {
    display: none;
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: linear-gradient(135deg, #ffffff 0%, #f8fbfc 100%);
    border-radius: 12px;
    box-shadow: 0 12px 35px rgba(46, 90, 97, 0.2);
    border: 1px solid rgba(46, 90, 97, 0.08);
    overflow: hidden;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 8px;
    min-width: 200px;
}

/* 下拉菜单顶部小箭头 */
.header .nev-child-2::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid #ffffff;
    filter: drop-shadow(0 -2px 4px rgba(46, 90, 97, 0.1));
}

.header .nev-child-2 li {
    width: 100%;
    background-color: transparent;
    text-align: left;
    border-bottom: 1px solid rgba(46, 90, 97, 0.08);
    font-weight: 400;
    transition: all 0.2s ease;
}

.header .nev-child-2 li:nth-last-child(1) {
    border-bottom: none;
}

.header .nev-child-2 li a {
    display: flex;
    align-items: center;
    padding: 14px 10px;
    color: #2E5A61;
    text-decoration: none;
    font-size: 100%;
    font-weight: 500;
    position: relative;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.header .nev-child-2 li a:before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0;
    z-index: -1;
}

.header .nev-child-2 li:hover {
    background-color: rgba(71, 183, 190, 0.05);
    transform: translateX(3px);
}

.header .nev-child-2 li:hover a {
    color: #2E5A61;
}

.header .nev-child-2 li:hover a:before {
    width: 4px;
}


/* 每个菜单项的特色样式 */
.header .nev-child-2 li:nth-child(1):hover {
    background: linear-gradient(90deg, rgba(255, 193, 7, 0.1), transparent);
}

.header .nev-child-2 li:nth-child(2):hover {
    background: linear-gradient(90deg, rgba(220, 53, 69, 0.1), transparent);
}

.header .nev-child-2 li:nth-child(3):hover {
    background: linear-gradient(90deg, rgba(255, 87, 34, 0.1), transparent);
}

.header .nev-child-2 li:nth-child(4):hover {
    background: linear-gradient(90deg, rgba(76, 175, 80, 0.1), transparent);
}

.header .nev-child-2 li:nth-child(5):hover {
    background: linear-gradient(90deg, rgba(156, 39, 176, 0.1), transparent);
}

/* 菜单项动画序列 */
.header li:hover .nev-child-2 li {
    animation: slideInFromLeft 0.3s ease forwards;
    opacity: 0;
    transform: translateX(-20px);
}

.header li:hover .nev-child-2 li:nth-child(1) { animation-delay: 0.1s; }
.header li:hover .nev-child-2 li:nth-child(2) { animation-delay: 0.15s; }
.header li:hover .nev-child-2 li:nth-child(3) { animation-delay: 0.2s; }
.header li:hover .nev-child-2 li:nth-child(4) { animation-delay: 0.25s; }
.header li:hover .nev-child-2 li:nth-child(5) { animation-delay: 0.3s; }

@keyframes slideInFromLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 下拉菜单显示动画 */
.header li:hover .nev-child-2 {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}


.help-container {
    background: #eff5ff;
    padding: 20px 0;
    box-sizing: border-box;
}

.help-container .wrapper {
    margin: 0 auto;
    display: flex;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* 主内容区域 */
.main-content {
    flex: 1;
    background: white;
    box-sizing: border-box;
    overflow-y: auto;
    height: calc(100vh - 100px);
}

.content-header {
    background: white;
    padding: 40px 60px;
    color: #333;
    text-align: center;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid #e9ecef;
}

.content-header::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.content-header h1 {
    font-size: 36px;
    font-weight: 700;
    margin: 0 0 16px 0;
    color: #2E5A61;
    position: relative;
    z-index: 2;
}

.content-header p {
    font-size: 16px;
    margin: 0;
    color: #6c757d;
    position: relative;
    z-index: 2;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.content-body {
    padding: 40px 60px;
    max-width: none;
    margin: 0;
}

.section {
    margin-bottom: 50px;
}

.section h2 {
    font-size: 120%;
    font-weight: 700;
    color: #2E5A61;
    margin: 0 0 10px 0;
    padding-bottom: 5px;
    border-bottom: 2px solid #e9ecef;
}

.section h3 {
    font-size: 20px;
    font-weight: 600;
    color: #2E5A61;
    margin: 30px 0 15px 0;
}

.section p {
    line-height: 1.8;
    color: #495057;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 30px 0;
}

.feature-card {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(74, 144, 164, 0.15);
    border-color: #6BC8D1;
}

.feature-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: #4A90A4;
    margin: 0 0 12px 0;
}

.feature-card p {
    line-height: 1.6;
    color: #6c757d;
    margin: 0;
}

.step-list {
    counter-reset: step-counter;
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.step-list li {
    counter-increment: step-counter;
    margin-bottom: 20px;
    padding-left: 50px;
    position: relative;
}

.step-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, #4A90A4, #6BC8D1);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.highlight-box {
    background: linear-gradient(135deg, rgba(74, 144, 164, 0.1), rgba(107, 200, 209, 0.1));
    border-left: 4px solid #4A90A4;
    padding: 20px;
    margin: 20px 0;
    border-radius: 0 8px 8px 0;
}

.highlight-box h4 {
    color: #4A90A4;
    margin: 0 0 10px 0;
    font-size: 16px;
    font-weight: 600;
}

.highlight-box p {
    margin: 0;
    color: #495057;
}

/* 左侧边栏导航 */
.sidebar-nav {
    width: 20%;
    min-width: 250px;
    background: #f8f9fa;
    height: calc(100vh - 100px);
    flex-shrink: 0;
    overflow-y: auto;
    border-right: 1px solid #e9ecef;
}

/* 侧边栏头部 */
.sidebar-header {
    padding: 20px 20px 15px 20px;
    border-bottom: 1px solid #e9ecef;
    background: #f8f9fa;
}

.sidebar-header h3 {
    margin: 0;
    font-size: 120%;
    font-weight: 700;
    color: #2E5A61;
    text-align: left;
}

/* 导航分类 */
.nav-section {
    margin-bottom: 0;
}

.nav-section-title {
    font-size: 120%;
    font-weight: 700;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0;
    padding: 15px 20px 8px 20px;
    background: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
}

.nav-section-list {
    list-style: none;
    padding: 0;
    margin: 0;
    background: white;
}

.nav-section-list li {
    margin: 0;
    border-bottom: 1px solid #f1f3f4;
}

.nav-section-list li:last-child {
    border-bottom: none;
}

.nav-section-list a {
    display: block;
    color: #495057;
    text-decoration: none;
    font-size: 100%;
    font-weight: 400;
    padding: 12px 20px 12px 30px;
    transition: all 0.2s ease;
    position: relative;
    border-left: 3px solid transparent;
}

.nav-section-list a:hover {
    background: rgba(74, 144, 164, 0.08);
    color: #4A90A4;
    border-left-color: #4A90A4;
}

.nav-section-list a.active {
    background: rgba(74, 144, 164, 0.12);
    color: #4A90A4;
    border-left-color: #4A90A4;
    font-weight: 500;
}

.nav-section-list a.active::before {
    content: '';
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 4px solid #4A90A4;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
}


/* 界面演示样式 */

.demo {
    border-radius: 8px;
    padding: 10px 0px;
} 

.demo_title {
    color: #2E5A61;
    font-weight: 600;
    padding: 5px 20px;
    margin-left: 20px;
    border-left: 4px solid #4A90A4;
    border-radius: 6px 0 0 6px;
    font-size: 110%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    margin-bottom: 10px;
}

.demo_title:hover {
    background: rgba(74, 144, 164, 0.08);
}

.demo-image {
    text-align: center;
    margin-top: 20px;
    width: 100%;
}

.demo-img {
    border: 1px solid #e9ecef;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    width: 80%;
    max-width: 800px;
}

.demo p {
    padding: 0 30px;
}

.demo a {
    color: #3366CC;
    text-decoration: 1px underline;
}

.demo a:hover {
    color: #254E9C;
    font-weight: 700;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #8b8b8b;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #636363;
}


/* copyright */
.copyright {
    width: 100%;
    margin: 0 auto;
    margin-bottom: 20px;
}

.copyright .bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin: 0 auto;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #1E3A4A;
}

.copyright .bottom p {
    margin: 0 20px;
    color: white;
}