/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
h1,h2,h3,h4,h5,h6{
    margin: 0;
    padding: 0;
}   

:root {
    --primary-color: #000;
    --secondary-color: #86868b;
    --background-color: #fff;
    --accent-color: #0066cc;
    --border-color: #d2d2d7;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.5;
    color: var(--primary-color);
    background-color: var(--background-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

/* 头部样式 */
.header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 44px;
}

.logo h1 {
    font-size: 20px;
    font-weight: 600;
}

.nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* 按钮样式 */
.btn {
    padding: 8px 16px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.btn-login {
    background-color: transparent;
    color: var(--accent-color);
}

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

/* 主要内容区域 */
.main {
    flex: 1;
    margin-top: 44px;
    padding: 60px 0;
}

.welcome-section {
    text-align: center;
    margin: 40px 0 80px;
    padding: 60px 20px;
}

.welcome-section h2 {
    font-size: 48px;
    font-weight: 600;
    margin-bottom: 16px;
}

.welcome-section p {
    font-size: 24px;
    color: var(--secondary-color);
    margin-bottom: 40px;
}

.welcome-actions {
    margin-top: 40px;
}

.welcome-actions .btn-primary {
    font-size: 18px;
    padding: 12px 36px;
    border-radius: 8px;
    background-color: var(--accent-color);
    color: white;
    transition: all 0.3s ease;
}

.welcome-actions .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.2);
}

/* 去掉按钮的下划线 */
.welcome-actions .btn {
    text-decoration: none;
}

/* 特性展示 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.feature-item {
    text-align: center;
    padding: 30px;
}

.feature-item h3 {
    font-size: 24px;
    margin-bottom: 16px;
}

.feature-item p {
    color: var(--secondary-color);
}

/* 页脚样式 */
.footer {
    background-color: #f5f5f7;
    padding: 20px 0;
    text-align: center;
    margin-top: auto; /* 确保footer在内容不足时贴底 */
}

.footer p {
    color: var(--secondary-color);
    font-size: 12px;
    margin: 5px 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .welcome-section h2 {
        font-size: 32px;
    }

    .welcome-section p {
        font-size: 18px;
    }

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

/* 用户信息和退出按钮样式 */
.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-name {
    font-size: 14px;
    color: var(--primary-color);
    text-decoration: none;
}

.user-name:hover {
    color: var(--accent-color);
}

.btn-text {
    color: var(--secondary-color);
    padding: 4px 8px;
    font-size: 14px;
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.3s;
}

.btn-text:hover {
    color: var(--accent-color);
}

/* 访客样式 */
.user-info.guest .user-email {
    color: var(--secondary-color);
}

/* 升级按钮样式 */
.btn-upgrade {
    color: var(--accent-color);
    font-size: 14px;
    padding: 4px 8px;
    border-radius: 4px;
    background: rgba(0, 102, 204, 0.1);
}

.btn-upgrade:hover {
    background: rgba(0, 102, 204, 0.2);
}

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

.modal.show {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 12px;
    padding: 24px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.modal-content h3 {
    margin-bottom: 24px;
    font-size: 20px;
    font-weight: 600;
}

/* 表单样式 */
.auth-form .form-group {
    margin-bottom: 20px;
}

.auth-form label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--secondary-color);
}

.auth-form input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
}

.auth-form input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.1);
}

/* 验证码组样式 */
.verification-code-group {
    display: flex;
    gap: 12px;
}

.verification-code-group input {
    flex: 1;
}

.verification-code-group button {
    white-space: nowrap;
    padding: 8px 16px;
    font-size: 14px;
}

/* 按钮组样式 */
.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

.modal-actions .btn {
    padding: 8px 24px;
}