:root {
    /* 深色模式默认变量 */
    --bg-dark: #0f1215;
    --surface: #1c2025;
    --accent: #3498db; /* 青色强调色 */
    --accent-hover: #26C6DA;
    --text-primary: #f2f2f2;
    --text-secondary: #b0b0b0;
    --card-border: rgba(255, 255, 255, 0.08);
    --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* 浅色模式变量 */
@media (prefers-color-scheme: light) {
    :root {
        --bg-dark: #f5f7fa;
        --surface: #feffff;
        --accent: #3498db;
        --accent-hover: #26C6DA;
        --text-primary: #2c3e50;
        --text-secondary: #546e7a;
        --card-border: rgba(0, 0, 0, 0.08);
    }
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 100%;
}

.form-group {
    position: relative;
}

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

.auth-form input {
    width: 100%;
    padding: 0.9rem 1.2rem;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    background-color: var(--surface);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.auth-form input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(0, 188, 212, 0.15);
}

.auth-form textarea {
    width: 100%;
    padding: 0.9rem 1.2rem;
    border: 1px solid var(--card-border);
    border-radius: 10px;
    background-color: var(--surface);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.auth-form textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(0, 188, 212, 0.15);
}

.additional-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
}

.remember-me input {
    width: auto;
}

.forgot-password {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

.forgot-password:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.register-link {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.register-link a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    margin-left: 8px;
}

.register-link a:hover {
    text-decoration: underline;
}

.article-container {
    max-width: 47rem;
    margin: 0 auto;
    padding: 0 15px;
}

/* 新增的登录卡片样式 */
.login-card {
    background: var(--surface);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    margin: 0 auto 4rem;
    max-width: 500px;
    border: 1px solid var(--card-border);
    transition: all 0.3s ease;
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
}

/* 注册卡片样式 */
.register-card {
    background: var(--surface);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    margin: 0 auto 4rem;
    max-width: 500px;
    border: 1px solid var(--card-border);
    transition: all 0.3s ease;
}

.register-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
}

/* 错误消息样式 */
.error-message {
    padding: 15px;
    background: rgba(255, 88, 88, 0.1);
    color: #ff5555;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    border: 1px solid rgba(255, 88, 88, 0.3);
    animation: fadeIn 0.3s ease;
}

.error-message i {
    margin-right: 10px;
    font-size: 1.2rem;
}

/* 验证码区域样式 */
.captcha-container {
    display: flex;
    gap: 15px;
    margin-bottom: -0.5rem;
}

.captcha-container input {
    flex: 1;
}

.captcha-image {
    background: var(--bg-dark);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 1px solid var(--card-border);
}

.captcha-image svg {
    width: 110px;
    height: 48px;
}

/* 密码强度指示器 */
.password-strength {
    display: flex;
    gap: 5px;
    margin-top: 5px;
}

.strength-bar {
    height: 4px;
    flex: 1;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    width: 0;
    transition: width 0.3s ease;
}

.strength-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 3px;
    text-align: right;
}

.terms-agreement {
    display: flex;
    align-items: center;
    gap: 8px;
}

.terms-agreement input {
    width: auto;
}

.terms-link {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

.terms-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.login-link {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.login-link a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    margin-left: 8px;
}

.login-link a:hover {
    text-decoration: underline;
}

.social-login {
    text-align: center;
    margin: 1.8rem 0;
    position: relative;
}

.social-login::before,
.social-login::after {
    content: '';
    position: absolute;
    top: 50%;
    height: 1px;
    background: var(--card-border);
    width: 30%;
}

.social-login::before {
    left: 0;
}

.social-login::after {
    right: 0;
}

.social-login span {
    padding: 0 12px;
    color: var(--text-secondary);
    background: var(--surface);
    position: relative;
    z-index: 1;
    font-size: 0.9rem;
}

.social-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 1.5rem;
}

.social-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border: 1px solid var(--card-border);
    cursor: pointer;
    transition: var(--transition);
}

.social-btn:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    box-shadow: 0 5px 15px rgba(0, 188, 212, 0.2);
}

.social-btn img {
    width: 24px;
    height: 24px;
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .page-title {
        font-size: 2rem;
    }
    
    .login-card {
        padding: 1.8rem;
        max-width: 100%;
    }
    
    .captcha-container {
        flex-direction: column;
        gap: 10px;
    }
    
    .social-buttons {
        gap: 10px;
    }
    
    .social-btn {
        width: 45px;
        height: 45px;
    }

    .register-card {
    padding: 1.8rem;
    max-width: 100%;
    }

}

@media (max-width: 576px) {
    .additional-options {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .remember-me {
        order: 2;
    }
    
    .page-header {
        margin-top: 5rem;
    }

    .terms-agreement {
    order: 2;
    }
    
    .page-header {
        margin-top: 5rem;
    }
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
        
.submit-btn {
    /* padding: 0.8rem;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease; */

    display: inline-block;
    background: rgba(0, 188, 212, 0.1);
    color: var(--accent);
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition);
    border: 1px solid rgba(0, 188, 212, 0.4);
    cursor: pointer;
    margin-right: 1rem;

}

.submit-btn:hover {
    /* background-color: var(--accent-hover); */
    background: rgba(0, 188, 212, 0.2);
    color: var(--accent-hover);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 188, 212, 0.2);
}

.submit-btn:active {
    background: rgba(0, 188, 212, 0.2);
    color: var(--accent-hover);
    transform: translateY(1px);
    box-shadow: 0 4px 16px rgba(0, 188, 212, 0.2);
}

.login-btn, .register-btn {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 1rem;
    font-weight: 500;
    font-size: 1.05rem;
    transition: color 0.3s ease;
}

.login-btn:hover, .register-btn:hover {
    color: var(--accent);
}