:root {
    --primary: #4d97ff;
    --secondary: #4280d7;
    --background: #f0f2f5;
    --card-bg: rgba(255, 255, 255, 0.8);
    --text: #333;
    --text-secondary: #666;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --border: 1px solid rgba(0, 0, 0, 0.1);
}

.dark-mode {
    --primary: #4d97ff;
    --secondary: #5fa3ff;
    --background: #1a1a2e;
    --card-bg: rgba(26, 26, 46, 0.8);
    --text: #f0f0f0;
    --text-secondary: #ccc;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --border: 1px solid rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background);
    color: var(--text);
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
header {
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: var(--border);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo img {
    height: 30px;
    margin-right: 10px;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.nav-links a:hover {
    background-color: rgba(77, 151, 255, 0.1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* 主题切换按钮 */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.2s;
}

.theme-toggle:hover {
    background-color: rgba(0, 0, 0, 0.1);
}

.dark-mode .theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.theme-toggle img {
    width: 20px;
    height: 20px;
    filter: invert(0%);
}

.dark-mode .theme-toggle img {
    filter: invert(100%);
}

/* 语言切换 */
.language-switcher {
    position: relative;
}

.language-btn {
    background: none;
    border: var(--border);
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text);
}

.language-options {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 4px;
    box-shadow: var(--shadow);
    padding: 5px 0;
    display: none;
    width: 120px;
    z-index: 10;
}

.language-switcher:hover .language-options {
    display: block;
}

.language-option {
    padding: 8px 15px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.language-option:hover {
    background-color: rgba(77, 151, 255, 0.1);
}

/* 登录/注册按钮 */
.auth-section {
    display: flex;
    align-items: center;
}

#authBtn {
    padding: 8px 16px;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid var(--primary);
    color: var(--primary);
    background: transparent;
}

#authBtn:hover {
    background-color: rgba(77, 151, 255, 0.1);
}

.profile-link {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.profile-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    cursor: pointer;
    background-size: cover;
    background-position: center;
}

/* 主要内容 */
main {
    padding: 30px 0;
}

.hero {
    text-align: center;
    padding: 60px 0;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--primary);
}

.hero p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 30px;
}

/* 项目卡片 */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.project-card {
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s;
    border: var(--border);
}

.project-card:hover {
    transform: translateY(-5px);
}

.project-image {
    height: 160px;
    background-color: #e0e0e0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
}

.dark-mode .project-image {
    background-color: #2a2a3a;
    color: #666;
}

.project-info {
    padding: 15px;
}

.project-title {
    font-size: 18px;
    margin: 0 0 5px;
    color: var(--text);
}

.project-author {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.project-stats {
    display: flex;
    gap: 15px;
    font-size: 13px;
    color: var(--text-secondary);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 8px;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow);
    position: relative;
    padding: 30px;
}

.close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    background: none;
    border: none;
}

.modal-title {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--primary);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text);
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: var(--border);
    border-radius: 4px;
    background-color: var(--background);
    color: var(--text);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

.btn {
    padding: 8px 16px;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

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

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background-color: rgba(77, 151, 255, 0.1);
}

/* 表单底部链接样式 */
.form-footer {
    margin-top: 15px;
    text-align: center;
    color: var(--text-secondary);
}

.form-footer a {
    color: var(--primary);
    text-decoration: none;
}

.form-footer a:hover {
    text-decoration: underline;
}

/* 个人主页样式 */
.profile-header {
    display: flex;
    gap: 30px;
    align-items: center;
    margin-bottom: 30px;
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border: var(--border);
}

.profile-avatar-large {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background-color: #e0e0e0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    font-size: 60px;
    position: relative;
    cursor: pointer;
    transition: transform 0.2s;
    background-size: cover;
    background-position: center;
}

.dark-mode .profile-avatar-large {
    background-color: #2a2a3a;
}

.profile-avatar-large:hover {
    transform: scale(1.05);
}

.profile-avatar-large:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--text);
    color: var(--background);
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
}

.profile-info h1 {
    margin: 0 0 10px;
}

.profile-stats {
    display: flex;
    gap: 20px;
    margin: 15px 0;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 账户设置样式 */
.account-settings {
    margin-top: 40px;
}

.settings-card {
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
    box-shadow: var(--shadow);
    border: var(--border);
}

/* 页脚 */
footer {
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 30px 0;
    margin-top: 50px;
    border-top: var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links h3 {
    margin-top: 0;
    margin-bottom: 15px;
    color: var(--primary);
}

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--primary);
}

/* 语言切换 */
.en {
    display: none;
}

.zh {
    display: inline;
}

.language-en .zh {
    display: none;
}

.language-en .en {
    display: inline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 36px;
    }

    .profile-header {
        flex-direction: column;
        text-align: center;
    }

    .profile-stats {
        justify-content: center;
    }

    .footer-content {
        flex-direction: column;
        gap: 30px;
    }
}