/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 */
    --primary-color: #1890ff;
    --primary-hover: #40a9ff;
    --primary-light: #e6f7ff;
    /* 辅助色 */
    --success-color: #52c41a;
    --success-light: #f6ffed;
    --warning-color: #faad14;
    --warning-light: #fffbe6;
    --error-color: #ff4d4f;
    --error-light: #fff1f0;
    /* 中性色 */
    --text-primary: #262626;
    --text-secondary: #595959;
    --text-tertiary: #8c8c8c;
    --border-color: #d9d9d9;
    --border-light: #e8e8e8;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 登录和注册页面样式 */
.login-form, .register-form {
    max-width: 420px;
    margin: 80px auto;
    padding: 40px;
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-form:hover, .register-form:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.login-form h2, .register-form h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-primary);
    font-size: 28px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: inherit;
    background-color: var(--card-bg);
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

.form-group input::placeholder, .form-group select::placeholder {
    color: var(--text-tertiary);
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light), inset 0 1px 2px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

.form-group input:hover, .form-group select:hover {
    border-color: var(--primary-light);
}

.form-group .error {
    color: var(--error-color);
    margin-top: 8px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.form-group .error::before {
    content: "⚠";
    font-size: 14px;
}

.btn {
    width: 100%;
    padding: 14px 24px;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

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

.btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn:disabled {
    background-color: var(--text-tertiary);
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
}

.btn:disabled:hover {
    box-shadow: var(--shadow-sm);
}

.register-link, .login-link {
    text-align: center;
    margin-top: 20px;
    color: var(--text-tertiary);
    font-size: 14px;
}

.register-link a, .login-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* 错误和成功消息样式 */
.error-message {
    padding: 12px 16px;
    margin-bottom: 20px;
    background-color: var(--error-light);
    color: var(--error-color);
    border: 1px solid rgba(255, 77, 79, 0.3);
    border-radius: var(--radius-sm);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    animation: slideIn 0.3s ease-out;
}

.success-message {
    padding: 12px 16px;
    margin-bottom: 20px;
    background-color: var(--success-light);
    color: var(--success-color);
    border: 1px solid rgba(82, 196, 26, 0.3);
    border-radius: var(--radius-sm);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    animation: slideIn 0.3s ease-out;
}

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

/* PayPay风格主页面样式 */
header.paypay-header {
    display: -webkit-flex;
    display: flex;
    -webkit-justify-content: space-between;
    justify-content: space-between;
    -webkit-align-items: center;
    align-items: center;
    margin-bottom: 30px;
    background: -webkit-linear-gradient(135deg, #1e88e5 0%, #2196f3 100%);
    background: linear-gradient(135deg, #1e88e5 0%, #2196f3 100%);
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.2);
    position: relative;
    overflow: hidden;
}

header.paypay-header::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    -webkit-transform: translate(50%, -50%);
    transform: translate(50%, -50%);
}

.welcome-section {
    position: relative;
    z-index: 1;
}

.welcome-text h1 {
    color: white;
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 4px 0;
    opacity: 0.9;
    letter-spacing: 0.5px;
}

.welcome-text .username {
    color: white;
    font-size: 28px;
    font-weight: 700;
    margin: 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-actions {
    position: relative;
    z-index: 1;
}

.logout-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 50px;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.logout-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* PayPay风格导航样式 */
nav.paypay-nav {
    margin-bottom: 30px;
}

nav.paypay-nav ul {
    display: -webkit-flex;
    display: flex;
    list-style: none;
    background-color: white;
    border-radius: 16px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    padding: 12px;
}

nav.paypay-nav ul li {
    -webkit-flex: 1;
    flex: 1;
    position: relative;
    margin: 0 4px;
}

nav.paypay-nav ul li a {
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    justify-content: center;
    padding: 16px 8px;
    text-align: center;
    text-decoration: none;
    color: #666;
    font-weight: 500;
    -webkit-transition: all 0.3s ease;
    transition: all 0.3s ease;
    font-size: 13px;
    letter-spacing: 0.5px;
    border-radius: 12px;
    min-height: 80px;
}

nav.paypay-nav ul li a:hover {
    background: #f0f4f8;
    color: #2196f3;
    -webkit-transform: translateY(-2px);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.15);
}

nav.paypay-nav ul li a.active {
    background: -webkit-linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    color: #1976d2;
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.2);
}

.nav-icon {
    font-size: 28px;
    display: block;
}

.nav-text {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

/* 选项卡内容样式 */
.tab-content {
    display: none;
    background-color: var(--card-bg);
    padding: 36px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.3s ease;
}

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

.tab-content.active {
    display: block;
}

.tab-content h2 {
    margin-bottom: 28px;
    color: var(--text-primary);
    font-size: 28px;
    font-weight: 600;
    position: relative;
    padding-bottom: 12px;
}

.tab-content h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

/* 账户板块样式 */
.account-info {
    display: flex;
    justify-content: center;
}

.balance {
    text-align: center;
    padding: 60px 40px;
    background: linear-gradient(135deg, var(--primary-light) 0%, #e8f4fd 100%);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(24, 144, 255, 0.2);
}

.balance:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.balance h3 {
    margin-bottom: 20px;
    color: var(--text-secondary);
    font-size: 18px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.balance-amount {
    font-size: 64px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -1px;
    margin: 0;
    text-shadow: 0 2px 4px rgba(24, 144, 255, 0.1);
}

/* 转账板块样式 */
.transfer-form {
    max-width: 600px;
    margin: 0 auto;
}

/* 账单板块样式 */
.transaction-list {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

.transaction-list table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--card-bg);
}

.transaction-list table th,
.transaction-list table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
    font-size: 14px;
    transition: background-color 0.2s ease;
}

.transaction-list table th {
    background-color: var(--bg-color);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 13px;
    position: sticky;
    top: 0;
    z-index: 10;
}

.transaction-list table tbody tr:hover {
    background-color: rgba(24, 144, 255, 0.05);
}

.transaction-list table tbody tr:last-child td {
    border-bottom: none;
}

.income {
    color: var(--success-color);
    font-weight: 600;
}

.expense {
    color: var(--error-color);
    font-weight: 600;
}

.no-data {
    text-align: center;
    color: var(--text-tertiary);
    padding: 80px 40px;
    font-size: 16px;
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

/* 我的板块样式 */
.profile-info {
    max-width: 600px;
    margin: 0 auto;
}

.info-item {
    display: flex;
    margin-bottom: 24px;
    padding: 20px;
    background-color: var(--bg-color);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.info-item:hover {
    background-color: var(--primary-light);
    border-color: rgba(24, 144, 255, 0.3);
    transform: translateX(4px);
}

.info-item label {
    width: 120px;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 15px;
}

.info-item span {
    flex: 1;
    color: var(--text-primary);
    font-size: 15px;
    word-break: break-all;
}

/* 页脚样式 */
footer {
    text-align: center;
    margin-top: 60px;
    padding: 24px;
    color: var(--text-tertiary);
    font-size: 14px;
    border-top: 1px solid var(--border-light);
    background-color: var(--card-bg);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    margin-top: 40px;
    font-size: 14px;
    color: var(--text-tertiary);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: row;
    flex-direction: row;
    -webkit-justify-content: space-between;
    justify-content: space-between;
    -webkit-align-items: center;
    align-items: center;
    flex-wrap: wrap;
}

.copyright p {
    margin: 8px 0;
    text-align: left;
}

.copyright a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.3s;
}

.copyright a:hover {
    color: var(--primary-color);
}

.friend-links {
    text-align: right;
}

.friend-links h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.friend-links ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: row;
    flex-direction: row;
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-justify-content: flex-end;
    justify-content: flex-end;
}

.friend-links li {
    margin: 0 8px;
}

.friend-links a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.3s;
}

.friend-links a:hover {
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    header.paypay-header {
        -webkit-flex-direction: column;
        flex-direction: column;
        gap: 16px;
        text-align: center;
        padding: 24px 16px;
    }

    .welcome-text .username {
        font-size: 24px;
    }

    .logout-btn {
        font-size: 13px;
        padding: 8px 14px;
    }

    nav.paypay-nav ul {
        -webkit-flex-direction: row;
        flex-direction: row;
        padding: 8px;
    }

    nav.paypay-nav ul li {
        margin: 0 2px;
    }

    nav.paypay-nav ul li a {
        padding: 12px 4px;
        min-height: 70px;
    }

    .nav-icon {
        font-size: 24px;
    }

    .nav-text {
        font-size: 11px;
    }
}

@media (max-width: 480px) {
    .footer-content {
        -webkit-flex-direction: column;
        flex-direction: column;
        -webkit-align-items: center;
        align-items: center;
        gap: 24px;
    }
    
    .copyright p {
        text-align: center;
    }
    
    .friend-links {
        text-align: center;
    }
    
    .friend-links ul {
        -webkit-justify-content: center;
        justify-content: center;
    }
    
    header.paypay-header {
        padding: 20px 12px;
        border-radius: 12px;
    }

    .welcome-text h1 {
        font-size: 18px;
    }

    .welcome-text .username {
        font-size: 20px;
    }

    nav.paypay-nav ul {
        -webkit-flex-wrap: wrap;
        flex-wrap: wrap;
    }

    nav.paypay-nav ul li {
        margin: 0 1px;
        -webkit-flex: 1 1 calc(50% - 2px);
        flex: 1 1 calc(50% - 2px);
        margin-bottom: 2px;
    }

    nav.paypay-nav ul li a {
        padding: 10px 2px;
        min-height: 60px;
    }

    .nav-icon {
        font-size: 20px;
    }

    .nav-text {
        font-size: 10px;
    }

    .tab-content {
        padding: 24px;
    }

    .tab-content h2 {
        font-size: 24px;
    }

    .balance {
        padding: 40px 20px;
    }

    .balance-amount {
        font-size: 48px;
    }

    .info-item {
        -webkit-flex-direction: column;
        flex-direction: column;
        gap: 8px;
    }

    .info-item label {
        width: 100%;
        margin-bottom: 0;
    }

    .transaction-list table th,
    .transaction-list table td {
        padding: 12px 16px;
        font-size: 13px;
    }
}