/* 登录模态框 - 遮罩层样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.15);
    backdrop-filter: var(--glass-backdrop-strong);
    -webkit-backdrop-filter: var(--glass-backdrop-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* 遮罩层显示状态 */
.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* 登录模态框主体容器 */
.login-modal {
    background: var(--glass-bg-ultra);
    border-radius: 28px;
    padding: 2.5rem;
    width: 90%;
    max-width: 420px;
    transform: scale(0.85) translateY(20px);
    transition: all 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: var(--shadow-2xl), 0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    border: 1px solid var(--border-light);
    backdrop-filter: var(--glass-backdrop-strong);
    -webkit-backdrop-filter: var(--glass-backdrop-strong);
    position: relative;
    overflow: hidden;
}

/* 模态框顶部装饰线 */
.login-modal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 28px 28px 0 0;
}

/* 模态框显示动画 */
.modal-overlay.show .login-modal {
    transform: scale(1) translateY(0);
}

/* 关闭按钮样式 */
.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

/* 模态框标题样式 */
.modal-title {
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1.6rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.01em;
}

/* 登录/注册标签切换栏 */
.login-tabs {
    display: flex;
    margin-bottom: 1.5rem;
    background: rgba(0, 0, 0, 0.04);
    border-radius: 12px;
    padding: 0.25rem;
}

/* 标签按钮样式 */
.login-tab {
    flex: 1;
    padding: 0.5rem;
    text-align: center;
    background: none;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

/* 激活标签样式 */
.login-tab.active {
    background: var(--card-bg);
    color: var(--accent-color);
    box-shadow: var(--shadow-sm);
    transform: scale(1.02);
}

/* 表单组容器 */
.form-group {
    margin-bottom: 1rem;
}

/* 水平布局的表单组 */
.form-group-horizontal {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.8rem;
}

/* 表单标签样式 */
.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
}

/* 水平布局中的标签特殊样式 */
.form-group-horizontal .form-label {
    margin-bottom: 0;
    min-width: 80px;
    flex-shrink: 0;
    text-align: right;
    color: var(--text-primary);
}

/* 表单输入框样式 */
.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-light);
    border-radius: 16px;
    font-size: 1rem;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
    box-shadow: var(--shadow-xs), 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
}

/* 水平布局中的输入框样式 */
.form-group-horizontal .form-input {
    flex: 1;
    padding: 0.6rem 0.8rem;
    font-size: 0.95rem;
}

/* 输入框焦点状态 */
.form-input:focus {
    outline: none;
    border-color: var(--border-accent);
    box-shadow: 0 0 0 4px var(--focus-ring), var(--shadow-lg);
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px) scale(1.02);
}

/* 提交按钮样式 */
.form-submit {
    width: 100%;
    padding: 0.75rem;
    background: var(--gradient-accent);
    color: white;
    border: none;
    border-radius: 16px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    margin-top: 0.5rem;
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    position: relative;
    overflow: hidden;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* 提交按钮悬停效果 */
.form-submit:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255, 255, 255, 0.15) inset;
    filter: brightness(1.05);
}

/* 按钮光效动画 */
.form-submit::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.form-submit:hover::before {
    left: 100%;
}

/* 表单底部区域 */
.form-footer {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 底部链接样式 */
.form-footer a {
    color: var(--accent-color);
    text-decoration: none;
    transition: all 0.2s ease;
}

.form-footer a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* 社交登录区域 */
.social-login {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* 社交登录标题 */
.social-login-title {
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 社交按钮容器 */
.social-buttons {
    display: flex;
    gap: 0.5rem;
}

/* 社交登录按钮 */
.social-btn {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    background: rgba(0, 0, 0, 0.02);
}

/* 社交按钮悬停效果 */
.social-btn:hover {
    border-color: var(--accent-color);
    background: rgba(0, 122, 255, 0.05);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* 响应式设计 - 手机端 */
@media (max-width: 480px) {
    .login-modal {
        padding: 1.5rem;
        margin: 1rem;
        max-height: 90vh;
        overflow-y: auto;
    }
    
    .modal-title {
        font-size: 1.4rem;
        margin-bottom: 1.2rem;
    }
    
    .form-group-horizontal {
        flex-direction: row;
        align-items: center;
        gap: 0.5rem;
        margin-bottom: 0.8rem;
    }
    
    .form-group-horizontal .form-label {
        text-align: left;
        min-width: 50px;
        flex-shrink: 0;
        margin-bottom: 0;
        font-size: 0.85rem;
        font-weight: 500;
        color: var(--text-primary);
    }
    
    .form-group-horizontal .form-input {
        flex: 1;
        padding: 0.7rem 0.9rem;
        font-size: 1rem;
        border-radius: 12px;
    }
    
    .form-submit {
        padding: 0.8rem;
        font-size: 1rem;
        margin-top: 0.5rem;
        border-radius: 12px;
    }
    
    .login-tabs {
        margin-bottom: 1.2rem;
    }
    
    .social-login {
        margin-top: 1.2rem;
        padding-top: 1.2rem;
    }
    
    .social-buttons {
        flex-direction: row;
        gap: 0.4rem;
    }
    
    .social-btn {
        padding: 0.6rem 0.3rem;
        border-radius: 10px;
        font-size: 0.8rem;
        flex: 1;
    }
    
    .social-btn span {
        font-size: 1rem;
    }
}