/* ========================================
   河南涌金环保科技有限公司 - 全局样式
   潮鞋ins风 | 黑色 + 亮红 + 浅灰
   ======================================== */

/* CSS Reset & 基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background-color: #f5f5f5;
    color: #1a1a1a;
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ========================================
   顶部导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: all 0.4s ease;
    padding: 20px 0;
}

.header.scrolled {
    background: rgba(0, 0, 0, 0.95);
    padding: 15px 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 28px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 2px;
}

.logo span {
    color: #ff3b3b;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-menu li a {
    color: #fff;
    font-size: 16px;
    font-weight: 500;
    position: relative;
    padding: 8px 0;
}

.nav-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #ff3b3b;
    transition: width 0.3s ease;
}

.nav-menu li a:hover::after,
.nav-menu li a.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 30px;
    height: 3px;
    background: #fff;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
    padding: 80px 0 40px;
    color: #ccc;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 60px;
    margin-bottom: 60px;
}

.footer-section h3 {
    color: #fff;
    font-size: 20px;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 15px;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: #ff3b3b;
}

.footer-section p {
    line-height: 1.8;
    margin-bottom: 15px;
}

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

.footer-section ul li a {
    color: #ccc;
    transition: all 0.3s ease;
}

.footer-section ul li a:hover {
    color: #ff3b3b;
    padding-left: 8px;
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    color: #888;
}

/* ========================================
   通用组件
   ======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 100px 0;
}

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

.section-title h2 {
    font-size: 42px;
    color: #1a1a1a;
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #ff3b3b, #ff6b6b);
    border-radius: 2px;
}

.section-title p {
    font-size: 18px;
    color: #666;
    max-width: 600px;
    margin: 30px auto 0;
}

.btn {
    display: inline-block;
    padding: 15px 40px;
    background: linear-gradient(135deg, #ff3b3b 0%, #ff6b6b 100%);
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(255, 59, 59, 0.3);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(255, 59, 59, 0.4);
}

.btn-outline {
    background: transparent;
    border: 2px solid #ff3b3b;
    color: #ff3b3b;
    box-shadow: none;
}

.btn-outline:hover {
    background: #ff3b3b;
    color: #fff;
}

/* ========================================
   动画效果
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1200px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: rgba(0, 0, 0, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 30px;
        transition: right 0.4s ease;
    }

    .nav-menu.active {
        right: 0;
    }

    .hamburger {
        display: flex;
    }

    .container,
    .footer-container {
        padding: 0 20px;
    }

    .section {
        padding: 60px 0;
    }

    .section-title h2 {
        font-size: 32px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .logo {
        font-size: 22px;
    }

    .btn {
        padding: 12px 30px;
        font-size: 14px;
    }
}