/* 全局样式 */
:root {
    --primary-color: #003366; /* 深蓝色 - 代表专业与信任 */
    --secondary-color: #CC0000; /* 红色点缀 - 香港/中国元素或警示 */
    --accent-color: #FFCC00; /* 金色点缀 - 香港特色 */
    --light-bg: #f9f9f9;
    --dark-text: #333;
    --light-text: #fff;
    --border-color: #ddd;
}

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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: #fff;
}

/* 导航栏 */
.navbar {
    background: var(--primary-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.nav-logo h1 {
    color: var(--light-text);
    font-size: 1.5rem;
}

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

.nav-logo p {
    color: #ccc;
    font-size: 0.8rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--light-text);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--accent-color);
}

/* 首屏大图 */
.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://via.placeholder.com/1920x800/111/333?text=Logistics+Background') no-repeat center center/cover;
    height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--light-text);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--light-text);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: white;
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    margin-right: 1rem;
    display: inline-block;
    transition: background 0.3s;
}

.btn-secondary {
    background-color: transparent;
    color: var(--light-text);
    border: 2px solid var(--light-text);
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    display: inline-block;
    transition: background 0.3s;
}

.btn-primary:hover {
    background-color: #b30000;
}

.btn-secondary:hover {
    background-color: rgba(255,255,255,0.1);
}

/* 核心优势 */
.features {
    padding: 5rem 2rem;
    background-color: var(--light-bg);
    text-align: center;
}

.features-container h3 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--dark-text);
}

/* 服务流程 */
.process {
    padding: 5rem 2rem;
    background-color: white;
    text-align: center;
}

.process-container h3 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.steps {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

/* 连接线 (仅桌面端显示效果好) */
.steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--light-bg);
    z-index: 0;
}

.step {
    background: var(--primary-color);
    color: white;
    padding: 2rem;
    border-radius: 10px;
    width: 200px;
    position: relative;
    z-index: 1;
    text-align: left;
}

.step span {
    display: block;
    width: 40px;
    height: 40px;
    background: var(--accent-color);
    color: var(--primary-color);
    border-radius: 50%;
    line-height: 40px;
    text-align: center;
    font-weight: bold;
    margin-bottom: 1rem;
}

.step h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

/* 页脚 */
footer {
    background: #1a1a1a;
    color: #999;
    padding: 4rem 2rem 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
}

.footer-about h4 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-form input,
.footer-form textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background: #333;
    color: white;
}

.footer-form button {
    background: var(--secondary-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    width: 100%;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #333;
    margin-top: 2rem;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-content h2 {
        font-size: 2.2rem;
    }
    
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--primary-color);
        padding: 1rem 0;
    }

    .steps {
        flex-direction: column;
    }

    .steps::before {
        display: none;
    }
}