/* ========================================
   拓冰网站优化 - 全局样式文件
   工业机械风：深灰 + 铁黑 + 明黄
   ======================================== */

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

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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    background-color: #1a1a1a;
    color: #e0e0e0;
    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;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #2a2a2a;
}

::-webkit-scrollbar-thumb {
    background: #f4c430;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #ffd700;
}

/* ========================================
   顶部导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 2px solid #f4c430;
    transition: all 0.4s ease;
}

.header.scrolled {
    background: rgba(10, 10, 10, 0.98);
    box-shadow: 0 4px 20px rgba(244, 196, 48, 0.3);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo img {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: #f4c430;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 10px 18px;
    font-size: 0.95rem;
    font-weight: 500;
    color: #e0e0e0;
    border: 1px solid transparent;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #f4c430;
    border-color: #f4c430;
    background: rgba(244, 196, 48, 0.1);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: #f4c430;
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 80%;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #f4c430;
    border-radius: 2px;
    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);
}

/* 移动端菜单 */
@media (max-width: 992px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: rgba(10, 10, 10, 0.98);
        flex-direction: column;
        padding: 30px;
        gap: 15px;
        transition: left 0.4s ease;
    }

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

    .nav-link {
        padding: 15px 20px;
        font-size: 1.1rem;
        border-bottom: 1px solid rgba(244, 196, 48, 0.2);
    }
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
    border-top: 3px solid #f4c430;
    padding: 60px 0 30px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 1.3rem;
    color: #f4c430;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background: #f4c430;
}

.footer-section p {
    color: #b0b0b0;
    line-height: 1.8;
    margin-bottom: 15px;
}

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

.footer-links a {
    color: #b0b0b0;
    transition: all 0.3s ease;
    display: inline-block;
}

.footer-links a:hover {
    color: #f4c430;
    transform: translateX(8px);
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
    color: #b0b0b0;
}

.contact-icon {
    width: 35px;
    height: 35px;
    background: rgba(244, 196, 48, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #f4c430;
    font-weight: bold;
}

.footer-bottom {
    border-top: 1px solid rgba(244, 196, 48, 0.3);
    padding-top: 25px;
    text-align: center;
}

.footer-bottom p {
    color: #808080;
    font-size: 0.9rem;
}

.footer-bottom a {
    color: #f4c430;
}

/* ========================================
   通用组件
   ======================================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
}

.section-padding {
    padding: 100px 0;
}

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

.section-title h2 {
    font-size: 2.5rem;
    color: #f4c430;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, transparent, #f4c430, transparent);
}

.section-title p {
    color: #b0b0b0;
    font-size: 1.1rem;
    max-width: 700px;
    margin: 25px auto 0;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 14px 35px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: linear-gradient(135deg, #f4c430 0%, #ffd700 100%);
    color: #0a0a0a;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(244, 196, 48, 0.4);
}

.btn-outline {
    background: transparent;
    color: #f4c430;
    border: 2px solid #f4c430;
}

.btn-outline:hover {
    background: #f4c430;
    color: #0a0a0a;
}

/* 卡片样式 */
.card {
    background: linear-gradient(145deg, #2a2a2a 0%, #1f1f1f 100%);
    border: 1px solid rgba(244, 196, 48, 0.2);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.4s ease;
}

.card:hover {
    transform: translateY(-10px);
    border-color: #f4c430;
    box-shadow: 0 15px 40px rgba(244, 196, 48, 0.2);
}

.card-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.card-content {
    padding: 25px;
}

.card-title {
    font-size: 1.3rem;
    color: #f4c430;
    margin-bottom: 12px;
}

.card-text {
    color: #b0b0b0;
    line-height: 1.7;
    margin-bottom: 20px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 15px;
    border-top: 1px solid rgba(244, 196, 48, 0.2);
    font-size: 0.85rem;
    color: #808080;
}

/* 网格布局 */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

@media (max-width: 992px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

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

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

/* 面包屑导航 */
.breadcrumb {
    background: rgba(10, 10, 10, 0.8);
    padding: 20px 0;
    border-bottom: 1px solid rgba(244, 196, 48, 0.3);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.breadcrumb-item {
    color: #b0b0b0;
    font-size: 0.9rem;
}

.breadcrumb-item a {
    color: #f4c430;
}

.breadcrumb-item a:hover {
    text-decoration: underline;
}

.breadcrumb-separator {
    color: #f4c430;
}

.breadcrumb-item.active {
    color: #e0e0e0;
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.page-item {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(244, 196, 48, 0.3);
    border-radius: 4px;
    color: #b0b0b0;
    transition: all 0.3s ease;
}

.page-item:hover,
.page-item.active {
    background: #f4c430;
    border-color: #f4c430;
    color: #0a0a0a;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .section-title h2 {
        font-size: 1.8rem;
    }
    
    .section-padding {
        padding: 60px 0;
    }
    
    .container {
        padding: 0 20px;
    }
}