/* 按钮组件 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    line-height: 1;
    border: 1px solid transparent;
    transition: all var(--transition-normal);
    cursor: pointer;
    user-select: none;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* 按钮变体 */
.btn-primary {
    background: var(--primary-color);
    color: var(--text-light);
    border-color: var(--primary-color);
}

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

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

.btn-secondary {
    background: var(--bg-white);
    color: var(--text-regular);
    border-color: var(--border-color);
}

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

.btn-text {
    background: transparent;
    color: var(--primary-color);
    border-color: transparent;
    padding: 8px 12px;
}

.btn-text:hover {
    background: rgba(64, 158, 255, 0.1);
}

/* 按钮尺寸 */
.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
    display: flex;
}

/* 按钮图标 */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 8px;
    border-radius: 50%;
}

/* 卡片组件 */
.card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-header {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-light);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.card-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

.card-body {
    margin-bottom: var(--space-lg);
}

.card-footer {
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-light);
    margin-top: var(--space-lg);
}

/* 表单组件 */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 500;
    color: var(--text-regular);
    font-size: 14px;
}

.form-label i {
    margin-right: 6px;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    outline: none;
}

.form-input:hover {
    border-color: var(--border-hover);
}

.form-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(64, 158, 255, 0.2);
}

.form-input::placeholder {
    color: var(--text-placeholder);
}

.form-input:disabled {
    background-color: var(--bg-light);
    cursor: not-allowed;
    opacity: 0.6;
}

/* 输入框组 */
.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-group .form-input {
    padding-left: 44px;
}

.input-icon {
    position: absolute;
    left: 16px;
    color: var(--text-secondary);
    pointer-events: none;
    font-size: 16px;
}

/* 输入框提示 */
.input-hint {
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* 复选框 */
.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
    font-size: 14px;
    color: var(--text-regular);
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: relative;
    height: 18px;
    width: 18px;
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-right: 8px;
    transition: all var(--transition-fast);
}

.checkbox-container:hover input ~ .checkmark {
    border-color: var(--primary-color);
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 4px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

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

/* 分隔线 */
.divider {
    display: flex;
    align-items: center;
    margin: var(--space-xl) 0;
    color: var(--text-secondary);
    font-size: 12px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-light);
}

.divider span {
    padding: 0 var(--space-md);
}

/* 徽章 */
.badge {
    display: inline-block;
    padding: 4px 8px;
    font-size: 12px;
    font-weight: 500;
    line-height: 1;
    color: var(--text-light);
    background-color: var(--primary-color);
    border-radius: var(--radius-full);
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
}

.badge-success {
    background-color: var(--success-color);
}

.badge-warning {
    background-color: var(--warning-color);
}

.badge-danger {
    background-color: var(--danger-color);
}

.badge-info {
    background-color: var(--info-color);
}

/* 工具提示 */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltip-text {
    visibility: hidden;
    width: 200px;
    background-color: var(--bg-dark);
    color: var(--text-light);
    text-align: center;
    padding: 8px;
    border-radius: var(--radius-md);
    position: absolute;
    z-index: 1000;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity var(--transition-normal);
    font-size: 12px;
    line-height: 1.4;
    box-shadow: var(--shadow-lg);
}

.tooltip .tooltip-text::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--bg-dark) transparent transparent transparent;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* 响应式隐藏 */
@media (max-width: 768px) {
    .d-md-none {
        display: none !important;
    }
    
    .d-md-block {
        display: block !important;
    }
}



/* 登录页面样式 */
.login-form {
    max-width: 400px;
    margin: 80px auto;
    padding: var(--space-xl);
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.login-form:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* 表单标题 */
.login-title {
    text-align: center;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 600;
    position: relative;
    padding-bottom: var(--space-md);
}

.login-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
}

/* 表单选项 - 记住我和忘记密码 */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    padding: 0 4px;
}

.forgot-password {
    font-size: 14px;
    color: var(--primary-color);
    transition: color var(--transition-fast);
}

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

/* 登录按钮 */
.login-button {
    width: 100%;
    padding: 14px 20px;
    background: var(--bg-gradient);
    color: var(--text-light);
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    position: relative;
    overflow: hidden;
}

.login-button::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 ease;
}

.login-button:hover::before {
    left: 100%;
}

.login-button:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.login-button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.login-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.login-button .button-text {
    font-weight: 500;
}

/* 密码显示/隐藏按钮 */
.password-toggle {
    position: absolute;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    transition: color var(--transition-fast);
    z-index: 2;
}

.password-toggle:hover {
    color: var(--primary-color);
}

/* 分隔线 - 或者 */
.divider {
    display: flex;
    align-items: center;
    margin: var(--space-xl) 0;
    color: var(--text-secondary);
    font-size: 12px;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-light);
}

.divider span {
    padding: 0 var(--space-md);
}

/* 社交登录按钮 */
.social-login {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.social-button {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-white);
    color: var(--text-regular);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.social-button:hover {
    transform: translateY(-1px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.social-button.google {
    color: #DB4437;
}

.social-button.github {
    color: #333;
}

.social-button.github:hover {
    background: #333;
    color: white;
}

/* 注册链接 */
.register-link {
    text-align: center;
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-light);
    font-size: 14px;
    color: var(--text-secondary);
}

.register-link a {
    color: var(--primary-color);
    font-weight: 500;
    margin-left: 4px;
    transition: color var(--transition-fast);
}

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

/* 加载动画 */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading.hidden {
    opacity: 0;
    visibility: hidden;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-light);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 导航栏样式 */
.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 12px 0;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-logo i {
    color: var(--primary-color);
    font-size: 24px;
}

.nav-menu {
    display: flex;
    gap: var(--space-lg);
    align-items: center;
}

.nav-link {
    color: var(--text-regular);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-regular);
    font-size: 20px;
    cursor: pointer;
}

/* 页脚样式 */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--space-xl) 0;
    margin-top: auto;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-legal {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    margin-top: var(--space-sm);
    flex-wrap: wrap;
}

.footer-legal a {
    color: var(--text-light);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.footer-legal a:hover {
    opacity: 1;
}

.footer-legal span {
    opacity: 0.3;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: var(--text-light);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-form {
        margin: 40px auto;
        padding: var(--space-lg);
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: var(--space-lg);
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        z-index: 99;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: block;
    }

    .social-login {
        flex-direction: column;
    }

    .footer-legal {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .footer-legal span {
        display: none;
    }
}

@media (max-width: 480px) {
    .login-form {
        margin: 20px auto;
        padding: var(--space-md);
    }

    .login-title {
        font-size: 20px;
    }

    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
}

/* 密码可见性切换动画 */
.password-toggle i.fa-eye-slash {
    color: var(--primary-color);
}

/* 表单验证样式 */
.form-input:valid {
    border-color: var(--success-color);
}

.form-input:invalid:not(:placeholder-shown) {
    border-color: var(--danger-color);
}

.form-input:invalid:not(:placeholder-shown) + .input-icon {
    color: var(--danger-color);
}


/* 成功和错误消息样式 */
.success-message {
    background-color: #d4edda;
    color: #155724;
    padding: 12px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid #c3e6cb;
    animation: slideDown 0.3s ease;
}

.success-message i {
    font-size: 18px;
}

.error-message {
    background-color: #f8d7da;
    color: #721c24;
    padding: 8px 12px;
    border-radius: 4px;
    margin-top: 5px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    animation: slideDown 0.3s ease;
}

.error-message i {
    font-size: 14px;
}

.form-group.has-error .form-input {
    border-color: #ff4d4f !important;
}

/* 加载状态 */
.register-button.loading {
    opacity: 0.8;
    cursor: not-allowed;
}

.register-button.loading .button-text {
    position: relative;
    padding-left: 20px;
}

.register-button.loading .button-text::after {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}