:root {
    --primary-color: #0051c3;
    --secondary-color: #002b88;
    --success-color: #198754;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
}

body {
    background-color: #f5f5f5;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 首页样式 */
body.home-page {
    background-color: white;
}

.login-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    width: 100%;
    max-width: 400px;
    margin: 2rem;
}

/* 主页样式 */
.main-content {
    flex: 1;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,.1);
    margin-bottom: 0;
}

.navbar-brand img {
    max-height: 40px;
}

.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 100px 0;
    margin-bottom: 40px;
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.hero-section .lead {
    font-size: 1.25rem;
    opacity: 0.9;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.feature-card p {
    color: #666;
    margin-bottom: 0;
}

.footer {
    background-color: white;
    padding: 40px 0;
    margin-top: auto;
    border-top: 1px solid rgba(0,0,0,.1);
}

.footer h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer .text-muted {
    color: #666 !important;
}

/* 注册页面样式 */
body.register-page {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.form-text {
    font-size: 0.875rem;
    color: #6c757d;
}

.required-field::after {
    content: '*';
    color: var(--danger-color);
    margin-left: 4px;
}

/* 仪表盘样式 */
.dashboard-page {
    background-color: #f8f9fa;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,.1);
}

.navbar-brand {
    font-weight: 600;
}

.nav-link {
    padding: .5rem 1rem;
    color: #495057;
}

.nav-link i {
    margin-right: .5rem;
}

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

.card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0,0,0,.075);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-2px);
}

.card-title {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.card-title i {
    margin-right: .5rem;
}

/* 登录页面样式 */
.login-page, .register-page {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    min-height: 100vh;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-card {
    width: 100%;
    max-width: 400px;
}

.card-header.bg-gradient-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
}

.card {
    border: none;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.input-group-text {
    border: none;
    background-color: #f8f9fa;
}

.input-group .form-control {
    border-left: none;
}

.input-group .form-control:focus {
    border-color: #dee2e6;
    box-shadow: none;
}

.form-text {
    font-size: 0.875rem;
    color: #6c757d;
    margin-top: 0.25rem;
}

.btn-light {
    background-color: #f8f9fa;
    border-color: #dee2e6;
}

.btn-light:hover {
    background-color: #e9ecef;
    border-color: #dee2e6;
}

.text-muted {
    color: #6c757d !important;
}