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

body {
    font-family: 'Microsoft YaHei', 'SimHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

h1, h2, h3 {
    color: #333;
    margin-bottom: 15px;
}

a {
    color: #1c3a59;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #1c3a59;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 16px;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #345f91;
    text-decoration: none;
}

.btn-secondary {
    background-color: #757575;
}

.btn-secondary:hover {
    background-color: #9e9e9e;
}

.btn-link {
    background: none;
    border: none;
    color: #1c3a59;
    cursor: pointer;
    font-size: 16px;
    text-decoration: underline;
}

.btn-link:hover {
    color: #345f91;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.radio-group {
    display: flex;
    gap: 20px;
}

.radio-group input {
    width: auto;
    margin-right: 5px;
}

.form-actions {
    margin-top: 30px;
}

.remember-me {
    display: flex;
    align-items: center;
}

.remember-me input {
    width: auto;
    margin-right: 10px;
}

/* Alert Styles */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Login and Register Forms */
.login-form,
.register-form {
    max-width: 500px;
    margin: 50px auto;
    padding: 30px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.login-form h1,
.register-form h1 {
    text-align: center;
    color: #1c3a59;
    margin-bottom: 10px;
}

.login-form h2,
.register-form h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #666;
    font-size: 1.5em;
}

.login-link,
.register-link {
    text-align: center;
    margin-top: 20px;
}

/* Header and Navigation */
.main-header,
.landing-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid #ddd;
    margin-bottom: 30px;
}

.main-nav ul,
.landing-nav ul {
    display: flex;
    list-style: none;
}

.main-nav li,
.landing-nav li {
    margin-left: 20px;
}

.main-nav a,
.landing-nav a {
    color: #333;
    font-weight: bold;
}

.main-nav a.active,
.landing-nav a.active {
    color: #1c3a59;
}

/* Dashboard */
.dashboard-content {
    margin-bottom: 40px;
}

.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.card {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.card h3 {
    color: #1c3a59;
}

.card p {
    margin-bottom: 20px;
}

/* Landing Page */
.hero {
    text-align: center;
    padding: 60px 0;
    background-color: #f0e6f6;
    border-radius: 8px;
    margin-bottom: 40px;
}

.hero h2 {
    font-size: 2.5em;
    color: #1c3a59;
}

.hero p {
    font-size: 1.2em;
    max-width: 700px;
    margin: 0 auto 30px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.features {
    margin-bottom: 40px;
}

.features h2 {
    text-align: center;
    margin-bottom: 30px;
}

.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.feature-card {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.feature-card h3 {
    color: #1c3a59;
}

.card-actions {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
}

.card-actions .btn {
    font-size: 0.9rem;
    padding: 8px 16px;
}

.about {
    background-color: white;
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.about h2 {
    color: #1c3a59;
    margin-bottom: 20px;
}

.about p {
    margin-bottom: 15px;
}

/* Footer */
.main-footer {
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid #ddd;
    margin-top: 40px;
    color: #666;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-header,
    .landing-header {
        flex-direction: column;
    }
    
    .main-nav,
    .landing-nav {
        margin-top: 20px;
    }
    
    .main-nav ul,
    .landing-nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    .main-nav li,
    .landing-nav li {
        margin: 10px 0;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        text-align: center;
        margin-bottom: 10px;
    }
}