:root {
    --primary-color: #e63946;
    /* 筑福红 */
    --secondary-color: #1d3557;
    /* 科技蓝 */
    --light-bg: #f8f9fa;
    /* 浅色背景 */
    --dark-text: #212529;
    /* 深色文字 */
    --light-gray: #e9ecef;
    /* 浅灰色 */
    --gradient-red: linear-gradient(135deg, #e63946 0%, #a4161a 100%);
    --section-padding: 100px 0;
}

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


body {
    font-family: 'Noto Sans SC', sans-serif;
    color: var(--dark-text);
    background-color: var(--light-bg);
    line-height: 1.6;
    overflow: scroll;
    overflow-x: hidden;
    height: 100%;
}

html::-webkit-scrollbar,
body::-webkit-scrollbar {
    display: none;
    /* 隐藏滚动条 (Webkit 内核浏览器) */
}

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

/* 导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 15px 0;
    z-index: 1000;
    
    box-sizing: border-box;
    transition: all 0.3s ease;
    background: rgba(248, 249, 250, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header #item {
    width: 100%;
    padding: 15px 0;
    z-index: 1000;
    box-sizing: border-box;
    transition: all 0.3s ease;
    background: rgba(248, 249, 250, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header.scrolled {
    padding: 15px 0;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

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

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark-text);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

.logo span {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--dark-text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
    font-family: 'Noto Sans SC', sans-serif;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--dark-text);
    cursor: pointer;
}

.cta-button {
    display: inline-block;
    padding: 10px 25px;
    background: var(--gradient-red);
    color: white;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(230, 57, 70, 0.3);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 7px 20px rgba(230, 57, 70, 0.4);
}