* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #7209b7;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --warning-color: #f8961e;
    --info-color: #43aa8b;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --border-radius: 12px;
    --box-shadow: 0 10px 20px rgba(0,0,0,0.08);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
    position: relative;
    overflow: hidden;
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 25px;
    border-bottom: 2px solid rgba(0,0,0,0.08);
    position: relative;
}

header h1 {
    color: var(--primary-color);
    font-size: 2.8rem;
    margin-bottom: 10px;
    font-weight: 700;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--gray-color);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

nav {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    padding: 20px;
    background: var(--light-color);
    border-radius: var(--border-radius);
    flex-wrap: wrap;
}

nav a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: 2px solid transparent;
    display: flex;
    align-items: center;
    gap: 8px;
}

nav a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
}

nav a:active {
    transform: translateY(0);
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.card {
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: none;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
}

.card.income {
    background: linear-gradient(135deg, #4cc9f0 0%, #3a8fd9 100%);
    color: white;
}

.card.income::before {
    background: #3a8fd9;
}

.card.expense {
    background: linear-gradient(135deg, #f72585 0%, #b5179e 100%);
    color: white;
}

.card.expense::before {
    background: #b5179e;
}

.card.balance {
    background: linear-gradient(135deg, #43aa8b 0%, #2d936c 100%);
    color: white;
}

.card.balance::before {
    background: #2d936c;
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    font-weight: 600;
    opacity: 0.9;
}

.card .amount {
    font-size: 2.5rem;
    font-weight: 700;
    margin-top: 10px;
    letter-spacing: -0.5px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 16px 36px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(67, 97, 238, 0.4);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-primary::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;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: transparent;
    color: var(--gray-color);
    padding: 16px 36px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    border: 2px solid var(--gray-color);
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: var(--gray-color);
    color: white;
    border-color: var(--gray-color);
}

footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 25px;
    border-top: 1px solid rgba(0,0,0,0.08);
    color: var(--gray-color);
    font-size: 0.95rem;
}

footer .nickname {
    color: #8a9ba8;
    font-weight: 500;
    opacity: 0.8;
    transition: var(--transition);
}

footer .nickname:hover {
    opacity: 1;
    color: var(--primary-color);
}

/* 表单样式 */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--dark-color);
    font-size: 1rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(67, 97, 238, 0.15);
}

.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
    border-color: #adb5bd;
}

/* 交易列表样式 */
.transaction-list {
    list-style: none;
    margin: 30px 0;
    padding: 0;
}

.transaction-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    margin-bottom: 15px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: var(--transition);
    border-left: 4px solid transparent;
}

.transaction-item:hover {
    transform: translateX(5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.transaction-item.income {
    border-left-color: var(--success-color);
}

.transaction-item.expense {
    border-left-color: var(--danger-color);
}

.transaction-details {
    display: flex;
    align-items: center;
    gap: 15px;
}

.category-icon {
    font-size: 1.8rem;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light-color);
    border-radius: 12px;
}

.transaction-details div {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.transaction-details strong {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark-color);
}

.transaction-details .description {
    color: var(--gray-color);
    font-size: 0.95rem;
    margin: 0;
}

.transaction-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 5px;
}

.transaction-info .amount {
    font-size: 1.4rem;
    font-weight: 700;
}

.transaction-item.income .amount {
    color: var(--success-color);
}

.transaction-item.expense .amount {
    color: var(--danger-color);
}

.transaction-info .date {
    color: var(--gray-color);
    font-size: 0.9rem;
}

/* 错误和成功消息 */
.error {
    background: linear-gradient(135deg, #f72585 0%, #b5179e 100%);
    color: white;
    padding: 15px 20px;
    border-radius: var(--border-radius);
    margin-bottom: 25px;
    font-weight: 500;
    box-shadow: var(--box-shadow);
}

.success {
    background: linear-gradient(135deg, #43aa8b 0%, #2d936c 100%);
    color: white;
    padding: 15px 20px;
    border-radius: var(--border-radius);
    margin-bottom: 25px;
    font-weight: 500;
    box-shadow: var(--box-shadow);
}

/* 分类列表样式 */
.category-lists {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.category-list {
    background: white;
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--box-shadow);
}

.category-list h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.4rem;
    font-weight: 600;
}

.category-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid rgba(0,0,0,0.08);
}

.category-list li:last-child {
    border-bottom: none;
}

.category-list li span {
    font-size: 1.1rem;
    font-weight: 500;
}

.category-list li button {
    padding: 8px 16px;
    border-radius: 8px;
    border: none;
    background: var(--primary-color);
    color: white;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-left: 10px;
}

.category-list li button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.category-list li form button {
    background: var(--danger-color);
}

.category-list li form button:hover {
    background: #d1146a;
}

/* 筛选表单样式 */
.filter-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
    background: var(--light-color);
    padding: 25px;
    border-radius: var(--border-radius);
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    
    .container {
        padding: 20px;
        border-radius: 16px;
    }
    
    header h1 {
        font-size: 2.2rem;
    }
    
    nav {
        flex-direction: column;
        gap: 10px;
        padding: 15px;
    }
    
    nav a {
        justify-content: center;
        padding: 14px;
    }
    
    .summary-cards {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .card {
        padding: 25px;
    }
    
    .card .amount {
        font-size: 2rem;
    }
    
    .transaction-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
        padding: 20px;
    }
    
    .transaction-info {
        align-items: flex-start;
        width: 100%;
        border-top: 1px solid rgba(0,0,0,0.08);
        padding-top: 15px;
    }
    
    .category-lists {
        grid-template-columns: 1fr;
    }
    
    .filter-form {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .card h3 {
        font-size: 1.1rem;
    }
    
    .card .amount {
        font-size: 1.8rem;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        padding: 14px;
    }
    
    .category-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .category-list li div {
        width: 100%;
        display: flex;
        gap: 10px;
    }
    
    .category-list li button {
        flex: 1;
        margin-left: 0;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.container {
    animation: fadeIn 0.5s ease-out;
}

/* 新的响应式导航样式 */
.main-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 40px;
    padding: 20px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    position: relative;
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998; /* 确保在导航菜单下面，但在页面内容上面 */
}

.overlay.active {
    display: block;
}

.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1000;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(10.5px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-10.5px) rotate(-45deg);
}

.nav-menu {
    display: flex;
    gap: 10px;
    align-items: center;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 600;
    transition: var(--transition);
    background: var(--light-color);
}

.nav-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
}

.nav-link.logout {
    background: linear-gradient(135deg, #f72585 0%, #b5179e 100%);
    color: white;
}

.nav-link.logout:hover {
    background: linear-gradient(135deg, #d1146a 0%, #9c0d7e 100%);
}

.nav-icon {
    font-size: 1.2rem;
}

.nav-text {
    font-size: 1rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 15px;
    background: var(--light-color);
    border-radius: var(--border-radius);
    font-weight: 500;
}

.user-avatar {
    font-size: 1.2rem;
    color: white;
}

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

/* 隐藏旧的导航样式 */
nav:not(.main-nav) {
    display: none;
}

/* 移动端响应式设计 - 重新设计布局 */
@media (max-width: 768px) {
    .main-nav {
        flex-direction: column;
        align-items: stretch;
        padding: 0;
        background: linear-gradient(135deg, #4361ee, #3a56d4);
        border-radius: 0 0 15px 15px;
        box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    }

    .nav-top-bar {
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
        padding: 12px 20px;
        background: transparent;
    }

    .hamburger {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        width: 36px;
        height: 28px;
        background: rgba(255, 255, 255, 0.1);
        border: none;
        border-radius: 6px;
        cursor: pointer;
        padding: 6px;
        z-index: 1000;
        transition: all 0.3s ease;
    }

    .hamburger:hover {
        background: rgba(255, 255, 255, 0.2);
    }

    .hamburger span {
        display: block;
        width: 100%;
        height: 3px;
        background: white;
        border-radius: 2px;
        transition: all 0.3s ease;
    }

    .hamburger .menu-label {
        position: absolute;
        bottom: -18px;
        font-size: 0.7rem;
        color: white;
        font-weight: 500;
        opacity: 0.9;
        white-space: nowrap;
        transition: opacity 0.3s ease;
    }

    .hamburger.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

    .hamburger.active .menu-label {
        opacity: 0.6;
    }

    .user-info {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 6px 12px;
        background: rgba(255, 255, 255, 0.15);
        border-radius: 20px;
        font-weight: 500;
        color: white;
        font-size: 0.9rem;
    }

    .user-avatar {
        font-size: 1.1rem;
        color: white;
    }

    .user-name {
        color: white;
    }

    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        background: white;
        position: relative;
        top: 0;
        left: 0;
        z-index: 999;
        border-radius: 0 0 15px 15px;
        box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        padding: 0;
        overflow: hidden;
    }

    .nav-menu.active {
        display: flex;
        animation: slideDown 0.3s ease-out;
    }

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

    .nav-link {
        display: flex;
        align-items: center;
        gap: 15px;
        padding: 16px 20px;
        border-radius: 0;
        text-decoration: none;
        color: #333;
        font-weight: 600;
        background: white;
        border-bottom: 1px solid #f0f0f0;
        transition: all 0.2s ease;
    }

    .nav-link:last-child {
        border-bottom: none;
    }

    .nav-link:hover {
        background: #f8f9fa;
        transform: none;
        box-shadow: none;
    }

    .nav-link.logout {
        background: #fff5f5;
        color: #e53e3e;
    }

    .nav-link.logout:hover {
        background: #fed7d7;
    }

    .nav-icon {
        font-size: 1.3rem;
        min-width: 24px;
        text-align: center;
    }

    .nav-text {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .card h3 {
        font-size: 1.1rem;
    }
    
    .card .amount {
        font-size: 1.8rem;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        padding: 14px;
    }
    
    .category-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .category-list li div {
        width: 100%;
        display: flex;
        gap: 10px;
    }
    
    .category-list li button {
        flex: 1;
        margin-left: 0;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.container {
    animation: fadeIn 0.5s ease-out;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}