/* 基础样式 */
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

:root {
--primary: #2962ff;
--primary-dark: #0039cb;
--dark: #1a237e;
--darker: #0d1440;
--light: #f5f7ff;
--gray: #5c6bc0;
--border: #c5cae9;
}

body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
line-height: 1.6;
color: var(--dark);
background-color: white;
}

.container {
max-width: 1200px;
margin: 0 auto;
padding: 0 20px;
}

/* 头部样式 */
header {
background-color: white;
padding: 20px 0;
border-bottom: 1px solid var(--border);
position: sticky;
top: 0;
z-index: 100;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.header-content {
display: flex;
justify-content: space-between;
align-items: center;
}

.logo {
display: flex;
align-items: center;
}

.logo h1 {
font-size: 24px;
margin-left: 10px;
color: var(--dark);
}

.logo-icon {
width: 40px;
height: 40px;
background: linear-gradient(135deg, var(--primary), var(--primary-dark));
border-radius: 10px;
display: flex;
align-items: center;
justify-content: center;
font-weight: bold;
color: white;
}

nav ul {
display: flex;
list-style: none;
}

nav li {
margin-left: 30px;
}

nav a {
color: var(--dark);
text-decoration: none;
font-weight: 500;
transition: color 0.3s;
}

nav a:hover {
color: var(--primary);
}

/* 主要内容区域 */
.hero {
padding: 100px 0;
text-align: center;
background: linear-gradient(135deg, #e8eaf6 0%, white 100%);
position: relative;
overflow: hidden;
}

.hero::before {
content: "";
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: radial-gradient(circle at 70% 30%, rgba(41, 98, 255, 0.1) 0%, transparent 50%);
}

.hero h2 {
font-size: 42px;
margin-bottom: 20px;
line-height: 1.2;
}

.hero p {
font-size: 18px;
max-width: 700px;
margin: 0 auto 30px;
color: var(--gray);
}

.btn {
display: inline-block;
background: linear-gradient(135deg, var(--primary), var(--primary-dark));
color: white;
padding: 14px 32px;
border-radius: 25px;
text-decoration: none;
font-weight: bold;
font-size: 16px;
transition: all 0.3s;
box-shadow: 0 4px 15px rgba(41, 98, 255, 0.3);
border: none;
cursor: pointer;
}

.btn:hover {
transform: translateY(-2px);
box-shadow: 0 6px 20px rgba(41, 98, 255, 0.4);
}

.btn-outline {
background: transparent;
border: 2px solid var(--primary);
color: var(--primary);
box-shadow: none;
margin-left: 15px;
}

.btn-outline:hover {
background: var(--primary);
color: white;
}

/* 特性区域 */
.features {
padding: 100px 0;
background-color: var(--light);
}

.section-title {
text-align: center;
margin-bottom: 60px;
}

.section-title h2 {
font-size: 36px;
color: var(--dark);
margin-bottom: 15px;
}

.section-title p {
color: var(--gray);
max-width: 600px;
margin: 0 auto;
}

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

.feature-card {
background-color: white;
border-radius: 15px;
padding: 30px;
box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
transition: all 0.3s;
border: 1px solid var(--border);
}

.feature-card:hover {
transform: translateY(-5px);
box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.feature-icon {
width: 70px;
height: 70px;
background: linear-gradient(135deg, var(--primary), var(--primary-dark));
border-radius: 15px;
display: flex;
align-items: center;
justify-content: center;
margin-bottom: 20px;
}

.feature-icon svg {
width: 35px;
height: 35px;
fill: white;
}

.feature-card h3 {
font-size: 20px;
margin-bottom: 15px;
color: var(--dark);
}

.feature-card p {
color: var(--gray);
}

/* 区块链支持区域 */
.blockchains {
padding: 100px 0;
background-color: white;
}

.blockchain-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
gap: 25px;
margin-top: 40px;
}

.blockchain-item {
background-color: var(--light);
border-radius: 15px;
padding: 30px 20px;
text-align: center;
transition: all 0.3s;
border: 1px solid var(--border);
}

.blockchain-item:hover {
transform: translateY(-5px);
border-color: var(--primary);
box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.blockchain-icon {
width: 60px;
height: 60px;
margin: 0 auto 15px;
background: white;
border-radius: 12px;
display: flex;
align-items: center;
justify-content: center;
font-weight: bold;
color: var(--primary);
border: 2px solid var(--border);
font-size: 20px;
}

/* 下载区域 */
.download-section {
padding: 100px 0;
background-color: var(--light);
text-align: center;
}

.download-options {
display: flex;
justify-content: center;
flex-wrap: wrap;
gap: 25px;
margin-top: 40px;
}

.download-option {
background-color: white;
border-radius: 15px;
padding: 35px;
width: 300px;
border: 1px solid var(--border);
transition: all 0.3s;
box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.download-option:hover {
transform: translateY(-5px);
box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
border-color: var(--primary);
}

.download-option h3 {
margin-bottom: 15px;
color: var(--dark);
font-size: 20px;
}

.download-option p {
color: var(--gray);
margin-bottom: 25px;
font-size: 14px;
}

.platform-icon {
width: 70px;
height: 70px;
margin: 0 auto 20px;
background: var(--light);
border-radius: 15px;
display: flex;
align-items: center;
justify-content: center;
font-size: 28px;
color: var(--primary);
border: 2px solid var(--border);
}

/* 安全特性区域 */
.security {
padding: 100px 0;
background-color: white;
}

.security-features {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 30px;
margin-top: 40px;
}

.security-item {
text-align: center;
padding: 35px;
}

.security-icon {
width: 90px;
height: 90px;
margin: 0 auto 25px;
background: var(--light);
border-radius: 20px;
display: flex;
align-items: center;
justify-content: center;
font-size: 36px;
color: var(--primary);
border: 2px solid var(--border);
}

.security-item h3 {
font-size: 20px;
margin-bottom: 15px;
color: var(--dark);
}

.security-item p {
color: var(--gray);
font-size: 14px;
}

/* 底部区域 */
footer {
background-color: var(--darker);
color: white;
padding: 70px 0 25px;
}

.footer-content {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 40px;
margin-bottom: 50px;
}

.footer-column h3 {
font-size: 20px;
margin-bottom: 25px;
color: var(--primary);
}

.footer-column ul {
list-style: none;
}

.footer-column li {
margin-bottom: 12px;
}

.footer-column a {
color: #b0b0b0;
text-decoration: none;
transition: color 0.3s;
}

.footer-column a:hover {
color: white;
}

.copyright {
text-align: center;
padding-top: 25px;
border-top: 1px solid #2d2d44;
color: #b0b0b0;
font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
.header-content {
flex-direction: column;
text-align: center;
}

nav ul {
margin-top: 20px;
justify-content: center;
flex-wrap: wrap;
}

nav li {
margin: 5px 15px;
}

.hero h2 {
font-size: 32px;
}

.hero p {
font-size: 16px;
}

.btn-outline {
margin-left: 0;
margin-top: 15px;
display: block;
}

.download-options {
flex-direction: column;
align-items: center;
}
}