/* --- 1. 全局设计系统 (深空极光风格) --- */
:root {
    --bg-color: #0B0E14;
    --bg-card: #15151A;
    --border-light: rgba(255, 255, 255, 0.08);
    --primary-gradient: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    --accent-purple: #3b82f6;
    --accent-blue: #60A5FA;
    --text-main: #FFFFFF;
    --text-secondary: #94A3B8;
    --radius-card: 24px;
    --radius-btn: 50px;
    --navbar-height: 80px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    overflow-x: hidden;
    padding-top: var(--navbar-height);
}

a {
    text-decoration: none;
    color: inherit;
    /* transition: 0.3s; */
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.navbar .logo {
  font-size: 24px;
  font-weight: 800;
  background: var(--primary-gradient);
  background-clip: text;
-webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: 40px;
  align-items: center;
}

.nav-links a {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 500;
  text-decoration: none;
  display: flex;
  align-items: center;
  height: 100%;
}

.nav-links a:hover {
  color: var(--text-main);
}
.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 20px 0;
  background: rgba(11, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  height: 80px;
  display: flex;
  align-items: center;
}

.btn-primary {
    padding: 12px 32px;
    background: #2563eb;
    color: white;
    border-radius: var(--radius-btn);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: 0.3s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    background: #1d4ed8;
}



/* 下拉菜单样式 */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #0b0e14;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
    z-index: 1001;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
}

.dropdown-content a {
    color: #9ca3af;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
    font-size: 14px;
    transition: all 0.3s ease;
}

.dropdown-content a:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: white;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover .dropbtn::after {
    width: 100%;
}



/* Header */
.case-header {
    height: 330px;
    min-height: 330px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: url('../images/ppch.png') center/cover no-repeat, radial-gradient(circle at 50% 0%, rgba(118, 75, 162, 0.2) 0%, transparent 60%);
    background-size: cover;
    position: relative;
    overflow: hidden;
}

.case-header .container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    padding: 0;
    /* transform: translateY(-15px); */
    position: relative;
    z-index: 2;
}

.header-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(14, 14, 18, 0.7);
    /* 半透明黑色遮罩 */
    z-index: 1;
}

.case-header .container {
    position: relative;
    z-index: 2;
}

.case-header h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    color: white;
}

.case-header p {
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    font-size: 18px;
    line-height: 1.6;
}

/* --- 核心三大板块 (Z-Layout) --- */
.core-section {
    padding: 100px 0;
}

.core-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 120px;
    /* 板块间距 */
}

/* 图片在右，文字在左 */
.core-row:nth-child(even) {
    direction: rtl;
}

.core-row:nth-child(even) .core-text {
    direction: ltr;
}

/* 图片容器 */
.core-img {
    position: relative;
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-light);
    height: 400px;
}

.core-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: 0.6s;
}

.core-img:hover img {
    transform: scale(1.05);
}

/* 装饰数字 */
.bg-num {
    position: absolute;
    top: -40px;
    left: -40px;
    font-size: 120px;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.03);
    line-height: 1;
    pointer-events: none;
    z-index: 0;
}

/* 文本区域 */
.core-text {
    position: relative;
    z-index: 1;
}

.core-tag {
    color: var(--accent-purple);
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-size: 12px;
    margin-bottom: 15px;
    display: block;
.core-title {
    font-size: 40px;
    font-weight: 700;
    color: white;
    margin-bottom: 20px;
}   line-height: 1.2;
}

/* 这里的文字颜色和行高是为了让您粘贴的文案更好看 */
.core-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 30px;
    text-align: justify;
    /* 两端对齐更整齐 */
}

/* 列表装饰 */
.core-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.list-item {
    display: flex;
    align-items: center;
    gap: 15px;
    color: #ddd;
    font-size: 15px;
}

.list-icon {
    width: 24px;
    height: 24px;
    background: rgba(37, 99, 235, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-purple);
    font-size: 12px;
}

/* Footer */
footer {
    background: #000;
    padding: 60px 0;
    border-top: 1px solid var(--border-light);
    text-align: center;
    color: #666;
    font-size: 12px;
}

/* 新增的底部边栏样式 */
.bottomSidebar {
    background: #000;
    color: #94a3b8;
    padding: 50px;
    margin-top: 50px;
}

.bottomSidebar .bottomSidebar-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #FFF;
    width: 1220px;
    padding: 30px 0;
    margin: 0 auto 30px auto;
}

.bottomSidebar .bottomSidebar-top .top-item {
    display: flex;
    justify-content: center;
    align-items: center;
}

.bottomSidebar .bottomSidebar-top .top-item img {
    width: 40px;
}

.bottomSidebar .bottomSidebar-flex {
    width: 1220px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
}

.bottomSidebar .bottomSidebar-flex .logo .logo-img {
    width: 200px;
}

.bottomSidebar .bottomSidebar-flex .logo .logo-box {
    display: flex;
}

.bottomSidebar .bottomSidebar-flex .logo .logo-box img {
    margin-right: 10px;
    margin-top: 10px;
}

.bottomSidebar .bottomSidebar-flex .util-list {
    color: #94a3b8;
    line-height: 40px;
    margin-left: 40px;
}

.bottomSidebar .bottomSidebar-flex .util-list h1 {
  margin-bottom: 12px;
  line-height: 16px;
    font-size: 16px;
    font-weight: 700;
}

.bottomSidebar .bottomSidebar-flex .util-list .item {
  line-height: 32px;
    color: #94a3b8;

    cursor: pointer;
}

.bottomSidebar .bottomSidebar-flex .util-list .item:hover {
  
    color: #FFF;
}

.bottomSidebar .bottomSidebar-flex .info {
    margin-left: 40px;
    line-height: 40px;
}

.bottomSidebar .bottomSidebar-flex .info h1 {
  margin-bottom: 12px;
    line-height: 16px;
    font-size: 16px;
    font-weight: 700;
}

.bottomSidebar .bottomSidebar-flex .info p {
    display: flex;
    align-items: center;
}

.bottomSidebar .bottomSidebar-flex .info p img {
    width: 30px;
    margin-right: 5px;
}

.bottomSidebar .bottomSidebar-flex .info .qrcode {
    display: flex;
    text-align: center;
    margin-top: 9px;
}

.bottomSidebar .bottomSidebar-flex .info .qrcode .qrcode-item {
    text-align: center;
    margin-right: 40px;
}

.bottomSidebar .bottomSidebar-flex .info .qrcode .qrcode-item img {
    width: 90px;
    height: 90px;
}

.bottomSidebar .bottomSidebar-flex .info .qrcode .qrcode-item div {
    margin-top: -12px;
}

.bottomSidebar .copyright {
    text-align: center;
    font-size: 13px;
    margin-top: 20px;
}

/* Responsive styles */
@media screen and (max-width: 767px) {
    .bottomSidebar {
        padding: 30px 20px;
    }

    .bottomSidebar .bottomSidebar-top {
        width: 100%;
        flex-direction: column;
        gap: 20px;
        padding: 20px 0;
    }

    .bottomSidebar .bottomSidebar-flex {
        width: 100%;
        flex-direction: column;
        gap: 30px;
    }

    .bottomSidebar .bottomSidebar-flex .logo,
    .bottomSidebar .bottomSidebar-flex .util-list,
    .bottomSidebar .bottomSidebar-flex .info {
        width: 100%;
    }

    .bottomSidebar .bottomSidebar-flex .util-list {
        margin-left: 0;
    }

    .bottomSidebar .bottomSidebar-flex .info {
        margin-left: 0;
    }

    .bottomSidebar .bottomSidebar-flex .info .qrcode {
        justify-content: center;
        flex-wrap: wrap;
    }

    .bottomSidebar .bottomSidebar-flex .info .qrcode .qrcode-item {
        margin-right: 20px;
        margin-left: 20px;
    }

    .bottomSidebar .bottomSidebar-flex .info .qrcode .qrcode-item img {
        width: 90px;
    }
}

@media (max-width: 900px) {

    .core-row,
    .core-row:nth-child(even) {
        grid-template-columns: 1fr;
        direction: ltr;
        gap: 40px;
        margin-bottom: 80px;
    }

    .core-img {
        height: 250px;
    }

    .case-header h1 {
        font-size: 42px;
    }
}