/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
}

body {
    font-size: 16px; /* 正文统一16px字体 */
    color: #333;
    line-height: 1.6;
}

/* 全局加粗样式 */
.bold {
    font-weight: bold !important;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* Font Awesome图标基础样式 */
.fas {
    font-size: inherit;
    color: inherit;
}
.nav_about {
    background: rgba(0, 54, 124, .45);
}

/* 简介区域样式 */
.intro {
    padding: 20px 0 50px;
}

.intro-container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 50px;
    align-items: flex-start;
}

.intro-text {
    flex: 1;
}

.intro-text p {
    margin-bottom: 20px;
    text-align: justify;
    font-size: 16px;
    line-height: 2;
}

.info-tags {
    display: flex;
    gap: 20px;
    margin: 16px 0;
}

.tag {
    background-color: #d8e0fd;
    color: #030404;
    padding: 8px 20px;
    border-radius: 10px;
    font-size: 16px;
}

.tag i {
    color: #10a1eb;
}

.tag .fas {
    margin-right: 8px;
}

.subjects {
    color: #030404;
    margin: 20px 0;
    font-size: 16px;
}

.highlight {
    color: #2E7D32;
    font-weight: bold;
    margin-top: 25px;
    font-size: 16px;
}

.intro-img {
    flex: 0 0 455px;
}

.intro-img img {
    width: 100%;
    height: auto;
    border-radius: 16px;
}

/* 通用标题样式 */
.section-title {
    text-align: center;
    margin-bottom: 40px;
}

.section-title h2 {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 12px;
}

.title-line {
    width: 70px;
    height: 4px;
    background-color: #0052D9;
    margin: 0 auto;
}

/* 深度参与区域样式 */
.participation {
    background-color: #F5F9FF;
    padding: 60px 0;
}

.participation-container {
    width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.participation-card {
    background-color: #fff;
    padding: 30px 25px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 3px 10px rgba(0,0,0,0.06);
}

.participation-card:nth-child(1),
.participation-card:nth-child(2),
.participation-card:nth-child(3) {
    grid-column: span 1;
}
.participation-card:nth-child(4),
.participation-card:nth-child(5) {
    grid-column: span 1.5;
}

.card-icon {
    margin-bottom: 20px;
    font-size: 32px;
    color: #0052D9;
}

.participation-card h3 {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 15px;
}

.participation-card p {
    font-size: 16px;
    color: #666;
    line-height: 1.8;
}

/* 成长路径区域样式 - 核心修正 */
.growth {
    padding: 60px 0;
}

.growth-container {
    width: 1200px;
    margin: 0 auto;
    position: relative;
    height: 470px;
    overflow: hidden;
}

/* 金字塔图片 - 层级置顶 (z-index更高) */
.growth-pyramid {
    position: absolute;
    left: 87px;
    top: 10px;
    width: 420px;
    height: 461px;
    z-index: 10; /* 层级高于文字背景 */
}

.growth-pyramid img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* 蓝色背景步骤 - 斜向排列 + 渐变透明 */
.growth-steps {
    position: absolute;
    left: 244px;
    top: 47px;
    width: 750px;
    height: 420px;
    display: flex;
    flex-direction: column;
    justify-content: end;
    z-index: 5; /* 层级低于金字塔图片 */
}

/* 每个步骤的斜向排列 + 蓝到透明渐变 */
.growth-step {
    /* 蓝到透明渐变背景 */
    background: linear-gradient(90deg, rgba(225,245,254,1) 0%, rgba(225,245,254,0) 100%);
    padding: 12px 57px;
    width: 800px;
    /* 斜向排列 - 每个步骤左缩进递增 */
}

/* 步骤4 - 最顶部，左缩进最小 */
.step-4 {
    margin-top: 48px;
    margin-left: 65px;
}

/* 步骤3 - 左缩进增加 */
.step-3 {
    margin-top: 20px;
    margin-left: 110px;
}

/* 步骤2 - 左缩进继续增加 */
.step-2 {
    margin-top: 18px;
    margin-left: 148px;
}

/* 步骤1 - 最底部，左缩进最大 (斜向效果) */
.step-1 {
    margin-top: 20px;
    margin-left: 180px;
}

.growth-step h4 {
    font-size: 17px;
    color: #2566eb;
    font-weight: bold;
    margin-bottom: 4px;
}

.growth-step p {
    font-size: 15px;
    color: #030404;
    line-height: 1.8;
}

/* 加入我们区域样式 */
.join-us {
    background-color: #F5F9FF;
    padding: 60px 0;
}

.join-container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 25px;
}

.join-card {
    flex: 1;
    background: linear-gradient(135deg, #12297a, #0070C0);
    color: #fff;
    padding: 30px 25px;
    border-radius: 10px;
    position: relative;
    height: 330px;
}

.join-card h3 {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #fff;
}

.join-card p {
    font-size: 16px;
    line-height: 1.8;
    color: #fff;
}

.card-bottom-icon {
    position: absolute;
    bottom: 25px;
    left: 25px;
    font-size: 28px;
    opacity: 0.8;
}

.card-bottom-icon i{
   color: #00f5ef;
}

/* 响应式兼容 */
@media (max-width: 1200px) {
    .nav-container,
    .banner-container,
    .intro-container,
    .participation-container,
    .growth-container,
    .join-container,
    .footer-container {
        width: 95%;
        margin: 0 auto;
    }
    .growth-container {
        height: auto;
        flex-direction: column;
        position: relative;
    }
    .growth-pyramid, .growth-steps {
        position: static;
        width: 100%;
        height: auto;
    }
    .growth-steps {
        margin-top: 20px;
    }
    .growth-step {
        width: 100%;
        margin-left: 0 !important;
    }
}