/* 基础样式设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c6e49;
    --secondary-color: #4c956c;
    --dark-color: #283618;
    --light-color: #fefae0;
    --accent-color: #dda15e;
    --danger-color: #bc4749;
    --gray-color: #606c38;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: var(--light-color);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 标题样式 */
h1, h2, h3, h4 {
    color: var(--dark-color);
    margin-bottom: 0.8rem;
    font-weight: 600;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
    margin-top: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.2rem;
}

p {
    margin-bottom: 1rem;
}

/* 链接样式 */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

/* 列表样式 */
ul, ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

/* 按钮样式 */
button {
    cursor: pointer;
    border: none;
    border-radius: 4px;
    padding: 8px 16px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.expand-btn {
    background-color: var(--secondary-color);
    color: white;
    display: block;
    margin: 10px 0;
}

.expand-btn:hover {
    background-color: var(--primary-color);
}

/* 头部样式 */
header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

header h1 {
    color: white;
    margin-bottom: 0.5rem;
}

header .container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 导航样式 */
nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
    justify-content: center;
}

nav li {
    margin: 0 10px;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 4px;
    font-weight: 500;
    transition: background-color 0.3s;
}

nav a:hover, nav a.active {
    background-color: var(--secondary-color);
    color: white;
    text-decoration: none;
}

/* 主内容区域样式 */
main {
    padding: 2rem 0;
}

section {
    margin-bottom: 3rem;
}

/* 介绍部分样式 */
#intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    padding: 2rem;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
}

.survival-priority {
    background-color: var(--secondary-color);
    color: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1.5rem;
}

.survival-priority h3 {
    color: white;
}

.survival-priority ul {
    list-style-type: none;
    margin-left: 0;
    padding-left: 0;
}

.survival-priority li {
    margin-bottom: 0.5rem;
    padding-left: 1rem;
    border-left: 3px solid var(--accent-color);
}

/* 提示卡片样式 */
.tip-card {
    background-color: white;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.tip-card h3 {
    color: var(--primary-color);
    border-bottom: 1px solid #eee;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.warning {
    background-color: #fff3e0;
    border-left: 4px solid var(--danger-color);
    padding: 1rem;
    margin-top: 1rem;
}

/* 庇护所部分样式 */
.shelter-types {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.shelter {
    padding: 1rem;
    background-color: #f9f9f9;
    border-radius: 8px;
    border: 1px solid #eee;
}

.hidden-content {
    display: none;
    padding: 1rem;
    background-color: #f5f5f5;
    border-radius: 8px;
    margin-top: 1rem;
}

/* 手风琴样式 */
.accordions {
    margin-top: 1rem;
}

.accordion {
    margin-bottom: 1rem;
    border-radius: 8px;
    overflow: hidden;
}

.accordion-btn {
    width: 100%;
    text-align: left;
    background-color: var(--secondary-color);
    color: white;
    padding: 10px 15px;
    font-weight: 500;
    border-radius: 4px;
}

.accordion-btn:hover {
    background-color: var(--primary-color);
}

.accordion-content {
    display: none;
    padding: 1rem;
    background-color: #f9f9f9;
    border: 1px solid #eee;
    border-top: none;
    border-radius: 0 0 8px 8px;
}

/* 小贴士部分样式 */
.tips-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.tip-box {
    background-color: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-top: 4px solid var(--accent-color);
}

/* 资源部分样式 */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.resource-card {
    background-color: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.resource-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* 页脚样式 */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

footer p {
    margin-bottom: 0.5rem;
}

/* 回到顶部按钮 */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 1.5rem;
    display: none;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    transition: all 0.3s;
    padding: 0;
    line-height: 1;
}

#back-to-top:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.6rem;
    }

    h3 {
        font-size: 1.3rem;
    }

    nav ul {
        flex-direction: row;
        justify-content: center;
    }

    nav li {
        margin: 5px;
    }

    .shelter-types,
    .tips-container,
    .resources-grid {
        grid-template-columns: 1fr;
    }

    #back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}

/* 打印样式 */
@media print {
    header, footer, #back-to-top, .expand-btn, .accordion-btn {
        display: none;
    }

    .hidden-content, .accordion-content {
        display: block !important;
    }

    body {
        background-color: white;
        color: black;
    }

    main {
        padding: 0;
    }

    .tip-card, .shelter, .tip-box, .resource-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}