/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

/* 导航栏样式 */
nav {
    background: #2c3e50;
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 1000; /* 新增层级控制 */
    box-shadow: 0 2px 10px rgba(0,0,0,0.1); /* 新增阴影分隔 */
}

nav a {
    color: white;
    text-decoration: none;
    margin-right: 2rem;
    transition: opacity 0.3s;
}

nav a:hover {
    opacity: 0.8;
}

/* 内容容器 */
.content-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

/* 移动端适配 */
@media (max-width: 768px) {
    .content-container {
        padding: 1.5rem;
        margin: 1rem auto;
    }
}

/* 资源网格布局 */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.resource-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* 联系表单 */
.contact-form {
    max-width: 600px;
    margin: 2rem auto;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.8rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.contact-form button {
    background: #3498db;
    color: white;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

/* 移动端适配 */
@media (max-width: 768px) {
    nav {
        text-align: center;
    }
    
    nav a {
        display: block;
        margin: 0.5rem 0;
    }

    .resource-grid {
        grid-template-columns: 1fr;
    }
}

.contact-methods {
    max-width: 600px;
    margin: 2rem auto;
    padding: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    margin: 1.5rem 0;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    transition: transform 0.2s ease-out, box-shadow 0.2s ease-out; /* 新增阴影过渡 */
}

.contact-item:hover {
    transform: translateX(10px) scale(1.02); /* 新增轻微缩放效果 */
    box-shadow: 0 4px 12px rgba(0,0,0,0.15); /* 强化阴影效果 */
}

.contact-item i {
    width: 40px;
    margin-right: 1rem;
    color: #2c3e50;
}

.contact-item a {
    font-size: 1.1rem;
    color: #2c3e50;
    text-decoration: none;
}

.contact-item a:hover {
    color: #3498db;
}

.hero-section {
    display: block; /* 修改原有flex布局 */
    padding: 2rem 0;
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin: 2rem 0;
    font-size: 2.5rem;
}

.hero-image {
    flex: 0 0 460px;
}

.hero-content {
    flex: 1;
}

.about-list {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-top: 1.5rem;
    padding-left: 1.5rem;
}

.about-list li {
    margin: 0.8rem 0;
    padding-left: 0.5rem;
}

.reasons-section {
    padding: 3rem 20px 0;
    /* 删除 background-color: #f8f9fa; */
}

.about-section {
    padding: 4rem 20px;
    /* 删除 background: white; */
}

.reasons-section h2 {
    text-align: center;
    margin-bottom: 2.5rem;
    font-size: 2rem;
}

.reasons-container {
    display: flex;
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.reason-item {
    flex: 1;
    min-width: 300px;
    padding: 25px;
    /* 删除 background: white; */
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}

.reason-item h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.reason-item p {
    line-height: 1.6;
    color: #666;
}

@media (max-width: 768px) {
    .contact-methods {
        padding: 10px;
    }
    .contact-item {
        margin: 1rem 0;
        padding: 10px;
    }
    .hero-section {
        flex-direction: column;
        padding: 1rem;
    }
    .hero-image {
        flex: 0 0 auto;
        width: 100%;
        max-width: 300px;
    }
    .about-list {
        font-size: 1rem;
        padding-left: 1rem;
    }
}

@media (max-width: 480px) {
    .resource-card h3 {
        font-size: 1.1rem;
    }
    .resource-card p {
        font-size: 0.9rem;
    }
    nav a {
        font-size: 0.9rem;
        margin-right: 1rem;
    }
    .reason-item {
        min-width: 100%;
    }
}

.about-section {
    padding: 4rem 20px;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    color: #2c3e50;
    margin-bottom: 3rem;
}

.about-content {
    display: flex;
    align-items: center;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.about-image {
    flex: 1;
    max-width: 400px;
}

.about-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.about-text {
    flex: 1;
    font-size: 1.1rem;
    line-height: 1.8;
    color: #4a5568;
}

@media (max-width: 768px) {
    .about-content {
        flex-direction: column;
        padding: 0 15px;
    }
    
    .about-image {
        max-width: 300px;
    }
}

footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
    font-size: 0.9rem;
}

.hamburger {
    display: none;
    font-size: 1.5rem;
    color: white;
    cursor: pointer;
}

.nav-links {
    display: flex;
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    
    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        margin-top: 1rem;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    nav a {
        margin: 0.5rem 0;
        padding: 0.8rem;
        background: rgba(255,255,255,0.1);
        border-radius: 4px;
    }
}


/* 统一背景样式 */
body {
    background: linear-gradient(rgba(255,255,255,0.8), rgba(255,255,255,0.8)),
                url('img/Real-ESRGANv3-anime_0504_162751.png');
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
    min-height: 100vh;
}

/* 统一动画效果 */
@keyframes fadeUp {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-container > * {
    opacity: 0;
    transform: translateY(30px);
}

.content-container > *.active {
    animation: fadeUp 0.6s ease-out forwards;
}
.about-content,
.about-image img,
.about-text,
.reason-item {
    opacity: 0;
    transform: translateY(30px);
    background: transparent;
}

.about-content.active,
.about-image img.active,
.about-text.active,
.reason-item.active {
    animation: fadeUp 0.6s ease-out forwards;
}

.reason-item:nth-child(1) { animation-delay: 0.3s; }
.reason-item:nth-child(2) { animation-delay: 0.5s; }
.reason-item:nth-child(3) { animation-delay: 0.7s; }

.button-group {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 2.5rem;
}

.cta-button, .sponsor-button {
    padding: 12px 30px;
    border: none;
    border-radius: 25px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s;
}

.cta-button {
    background: #3498db;
    color: white;
}

.sponsor-button {
    background: #e67e22;
    color: white;
}

.cta-button:hover, .sponsor-button:hover {
    transform: translateY(-2px);
}

@media (max-width: 480px) {
    .button-group {
        flex-direction: column;
        gap: 15px;
    }
}