/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* Container */
.container {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 450px;
    text-align: center;
}

/* Logo */
.logo {
    width: 80px;
    margin-bottom: 30px;
}

/* Title */
.title {
    font-size: 28px;
    font-weight: 700;
    color: #333;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    margin-bottom: 30px;
    font-size: 16px;
}

/* Form */
.form-group {
    text-align: left;
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 14px;
    border: 2px solid #e1e5e9;
    border-radius: 12px;
    font-size: 16px;
    transition: border-color 0.3s;
    outline: none;
}

.form-group input:focus,
.form-group select:focus {
    border-color: #667eea;
}

/* Radio Group */
.radio-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
}

.radio-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    color: #555;
}

.radio-group input {
    margin-right: 8px;
    width: auto;
}

/* Button */
.btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn:active {
    transform: translateY(0);
}

/* Link */
.link {
    display: block;
    margin-top: 20px;
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.link:hover {
    text-decoration: underline;
}

/* Alert */
.alert {
    padding: 15px;
    border-radius: 10px;
    margin: 20px 0;
    font-weight: 500;
}

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

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 30px 20px;
        margin: 10px;
    }
    
    .title {
        font-size: 24px;
    }
    
    .btn {
        padding: 14px;
        font-size: 16px;
    }
}

/* Home Page */
.home-container {
    max-width: 800px;
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

.user-info {
    text-align: center;
    margin-bottom: 30px;
}

.user-info h2 {
    color: #333;
    margin-bottom: 10px;
}

.user-info p {
    color: #666;
}

.logout-btn {
    background: #e74c3c;
    margin-top: 20px;
}

/* Verify Page */
#result {
    margin-top: 20px;
    padding: 15px;
    border-radius: 10px;
    font-weight: 500;
}

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

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