/* 全局样式 */
:root {
    --primary-color: #4caf50;
    --secondary-color: #388e3c;
    --accent-color: #8bc34a;
    --text-color: #333;
    --light-text: #666;
    --lighter-text: #999;
    --border-color: #ddd;
    --light-bg: #f5f5f5;
    --white: #fff;
    --shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--light-bg);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

button, .btn {
    cursor: pointer;
    border: none;
    outline: none;
    transition: var(--transition);
}

/* 头部样式 */
header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
}

.logo h1 {
    font-size: 24px;
    color: var(--primary-color);
    display: flex;
    align-items: center;
}

.logo h1 i {
    margin-right: 10px;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 2px;
    position: relative;
}

nav ul li a {
    color: var(--text-color);
    font-weight: 500;
    padding: 10px 0;
    display: flex;
    align-items: center;
}

nav ul li a i {
    margin-right: 5px;
}

nav ul li a.active {
    color: var(--primary-color);
}

nav ul li a:hover {
    color: var(--primary-color);
}

/* 下拉菜单 */
.dropdown {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--white);
    min-width: 180px;
    box-shadow: var(--shadow);
    z-index: 1;
    border-radius: 4px;
    overflow: hidden;
}

.dropdown-content a {
    color: var(--text-color);
    padding: 12px 16px;
    display: block;
    border-bottom: 1px solid var(--border-color);
}

.dropdown-content a:last-child {
    border-bottom: none;
}

.dropdown-content a:hover {
    background-color: var(--light-bg);
}

.dropdown-content a.active {
    color: var(--primary-color);
    background-color: rgba(76, 175, 80, 0.1);
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown a i.fa-chevron-down {
    margin-left: 5px;
    font-size: 12px;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 60px 0;
    text-align: center;
}

.hero h2 {
    font-size: 36px;
    margin-bottom: 15px;
}

.hero p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* 搜索框 */
.search-box {
    max-width: 700px;
    margin: 0 auto;
}

.search-container {
    display: flex;
    background-color: var(--white);
    border-radius: 4px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.search-container input {
    flex: 1;
    padding: 15px;
    border: none;
    outline: none;
    font-size: 16px;
}

.search-container select {
    padding: 15px;
    border: none;
    outline: none;
    background-color: var(--white);
    border-left: 1px solid var(--border-color);
    font-size: 16px;
    color: var(--text-color);
    cursor: pointer;
}

.search-container button {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 15px 25px;
    font-size: 16px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.search-container button:hover {
    background-color: var(--secondary-color);
}