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

.form-group label {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
    font-family: '华文中宋', '宋体';
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: #fff;
    padding: 0 5px;
    pointer-events: none;
    z-index: 1;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
    position: relative;
    z-index: 0;
}

.form-group input:focus {
    border-color: #579a47;
    outline: none;
    box-shadow: 0 0 0 3px rgba(87, 154, 71, 0.1);
}

.form-group input:focus + label,
.form-group.focused label {
    top: 0;
    font-size: 12px;
    color: #579a47;
    transform: translateY(-50%);
    z-index: 2;
}

/* 登录框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal.show {
    display: flex;
    animation: fadeIn 0.3s ease-out;
}

.modal-container {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    width: 100%;
    max-width: 400px;
    position: relative;
    transform: translateY(-20px);
    opacity: 0;
    animation: slideIn 0.3s ease-out forwards;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
    transition: opacity 0.3s ease-in-out;
    opacity: 0;
}

.modal-container {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    width: 400px;
    position: relative;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    transform: translateY(-20px) scale(0.95);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-overlay.active .modal-container {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    cursor: pointer;
    font-size: 24px;
    color: #666;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s;
}

.modal-close:hover {
    color: #333;
    background: rgba(0, 0, 0, 0.05);
    transform: rotate(90deg);
}

.modal-header {
    text-align: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    font-size: 24px;
    color: #333;
    font-family: '华文中宋', '宋体';
}

.modal-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.modal-tab {
    padding: 10px 20px;
    cursor: pointer;
    color: #666;
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-tab.active {
    color: #579a47;
    transform: scale(1.05);
}

.modal-tab::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    width: 0;
    height: 2px;
    background: #579a47;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-50%);
}

.modal-tab.active::after {
    width: 100%;
}

.modal-form {
    display: none;
    opacity: 0;
    position: absolute;
    width: 100%;
    left: 0;
    padding: 0 30px;
    transform: translateX(50px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-form.active {
    display: block;
    opacity: 1;
    transform: translateX(0);
}

.form-submit {
    width: 100%;
    padding: 12px;
    background: #579a47;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    margin-top: 10px;
    z-index: 1;
}

.form-submit:hover {
    background: #467a39;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(87, 154, 71, 0.2);
}

.form-submit:active {
    transform: translateY(0);
    box-shadow: none;
}

.form-submit::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease-out, height 0.6s ease-out;
}

.form-submit:active::after {
    width: 200px;
    height: 200px;
    opacity: 0;
}

.form-footer {
    text-align: center;
    margin-top: 15px;
    color: #666;
    opacity: 0;
    transform: translateY(10px);
    animation: fadeInUp 0.5s forwards 0.3s;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-footer a {
    color: #579a47;
    text-decoration: none;
    position: relative;
    transition: all 0.3s;
}

.form-footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: #579a47;
    transition: width 0.3s ease-in-out;
}

.form-footer a:hover::after {
    width: 100%;
}

#loginForm, #registerForm {
    min-height: 320px;
    box-sizing: border-box;
    padding-bottom: 20px;
}

.modal-forms-container {
    position: relative;
    min-height: 320px;
    margin: 0 -30px;
    overflow: hidden;
}

/* 错误提示 */
.form-group.error input {
    border-color: #ff4d4f;
}

.error-message {
    color: #ff4d4f;
    font-size: 12px;
    margin-top: 4px;
    animation: fadeIn 0.3s ease;
}

/* 加载状态 */
.form-submit:disabled {
    background-color: #b7b7b7;
    cursor: not-allowed;
}

/* Toast提示 */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 10px 20px;
    border-radius: 4px;
    z-index: 10000;
    opacity: 0;
    transition: all 0.3s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* 用户菜单 */
.user-menu {
    position: relative;
    cursor: pointer;
    padding: 5px 10px;
}

.username {
    color: #333;
    font-weight: 500;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid #eee;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    display: none;
    min-width: 120px;
    z-index: 1000;
}

.user-menu:hover .dropdown-menu {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 8px 16px;
    color: #333;
    text-decoration: none;
    transition: background-color 0.2s;
}

.dropdown-menu a:hover {
    background-color: #f5f5f5;
}

.dropdown-menu .logout-btn {
    color: #ff4d4f;
    border-top: 1px solid #eee;
}

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

/* 响应式调整 */
@media screen and (max-width: 768px) {
    .modal-container {
        width: 90%;
        margin: 20px auto;
    }
    
    .user-menu {
        padding: 3px 8px;
    }
    
    .username {
        font-size: 14px;
    }
    
    .dropdown-menu {
        min-width: 100px;
    }
    
    .dropdown-menu a {
        padding: 6px 12px;
        font-size: 14px;
    }
}

/* IE兼容性支持 */
.ie .modal-container {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.ie .toast {
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
}

.ie .form-group input:focus + label,
.ie .form-group.focused label {
    transform: translateY(-20px) scale(0.8);
    color: #579a47;
}