:root {
    --primary: #00f2fe;
    --bg: #dce1ec;
    --card-bg: rgba(200, 210, 224, 0.8);
    --text: #0e5bc1;
    --max-width: 1440px;
    --content-padding: clamp(20px, 5vw, 50px);
    --section-spacing: clamp(30px, 5vw, 50px);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

body {
    padding: 0;
    margin: 0;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--content-padding);
}

.section-header {
    text-align: center;
    padding: clamp(40px, 8vh, 80px) 0;
}

.section-title {
    font-size: clamp(24px, 4vw, 36px);
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    color: #666;
}

.container-image {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-bottom: var(--section-spacing);
}

.container-img {
    width: 100%;
    max-width: 1200px;
    height: auto;
    object-fit: contain;
}

.section-title-header{
    font-size: 2.8rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
    position: relative;
    display: inline-block;
    padding: 0 2rem;
    margin-top: 50px;
    text-align: center;
}
.section-title-header:hover{
    content: "";
    position: absolute;
    left: 0;
    bottom: -10px;
    width: 100%;
    height: 3px;
    background: var(--gradient);
}

/* 功能导航 */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: clamp(20px, 3vw, 30px);
    margin: var(--section-spacing) 0;
}

.nav-container {
    background: #fff;
    padding: clamp(20px, 3vw, 30px);
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.nav-container:hover {
    transform: translateY(-5px);
}

.nav-container h3 {
    font-size: clamp(18px, 2.5vw, 22px);
    margin-bottom: 10px;
}

.nav-container p {
    font-size: clamp(14px, 1.8vw, 16px);
    color: #666;
}

/* 内容模块 */
.section {
    margin: var(--section-spacing) 0;
}

.card {
    background: #fff;
    padding: clamp(25px, 4vw, 40px);
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.card-title {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
}

.card-title i {
    font-size: clamp(24px, 3vw, 32px);
    color: #007bff;
}

.card-title h2 {
    font-size: clamp(20px, 2.5vw, 28px);
}

.card h3 {
    font-size: clamp(18px, 2vw, 22px);
    margin: 20px 0 15px;
}

.device-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin: 15px 0;
}

.device-item {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-size: clamp(14px, 1.8vw, 16px);
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-item {
    padding: 10px 0;
    font-size: clamp(14px, 1.8vw, 16px);
    position: relative;
    padding-left: 25px;
}

.feature-item::before {
    content: "•";
    position: absolute;
    left: 10px;
    color: #007bff;
}

.grid-col-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.flow-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.flow-item {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.flow-item h3 {
    font-size: clamp(16px, 2vw, 20px);
    margin-bottom: 10px;
}

.flow-item p {
    font-size: clamp(14px, 1.8vw, 16px);
    color: #666;
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    
    .card {
        padding: 20px;
    }
    
    .grid-col-2 {
        grid-template-columns: 1fr;
    }
    
    .device-list {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .grid-col-2 {
        gap: 20px;
    }
    
    .flow-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 手机端 */
@media (max-width: 576px) {
  .box { width: 100%; }
}

/* 平板 */
@media (min-width: 577px) and (max-width: 992px) {
  .box { width: 50%; }
}

/* 桌面端 */
@media (min-width: 993px) {
  .box { width: 25%; }
}