:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #0e7490;
    --accent: #f97316;
    --light: #f3f4f6;
    --dark: #1f2937;
    --success: #10b981;
    --gray: #9ca3af;
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Source Sans Pro', sans-serif;
    background: linear-gradient(135deg, #f0f7ff 0%, #e6f0ff 100%);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: var(--dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

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

.logo {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 32px;
    color: var(--primary);
    display: inline-block;
    margin-bottom: 10px;
}

.tagline {
    color: var(--secondary);
    font-size: 18px;
    margin-bottom: 20px;
}

.form-container {
    background-color: white;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    padding: 40px;
    width: 100%;
    position: relative;
    overflow: hidden;
    margin-bottom: 40px;
}

.form-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

h1 {
    font-family: 'Montserrat', sans-serif;
    text-align: center;
    color: var(--primary);
    margin-bottom: 15px;
    font-weight: 700;
    font-size: 28px;
    position: relative;
    padding-bottom: 15px;
}

h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--accent);
    border-radius: 2px;
}

.form-description {
    text-align: center;
    margin-bottom: 35px;
    color: var(--dark);
    font-size: 18px;
    line-height: 1.6;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.option-card {
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    padding: 25px 15px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: white;
    position: relative;
}

.option-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
}

.option-card.selected {
    border-color: var(--primary);
    background-color: #f0f7ff;
    box-shadow: var(--card-shadow);
}

.option-card.selected::after {
    content: '✓';
    position: absolute;
    top: 10px;
    right: 10px;
    width: 24px;
    height: 24px;
    background-color: var(--success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: bold;
}

.option-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    display: inline-block;
    width: 70px;
    height: 70px;
    line-height: 70px;
    border-radius: 50%;
    background-color: #e6f0ff;
    color: var(--primary);
    text-align: center;
    transition: var(--transition);
}

.option-card.selected .option-icon {
    background-color: var(--primary);
    color: white;
}

.option-label {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 8px;
}

.option-description {
    font-size: 0.85rem;
    color: var(--gray);
    line-height: 1.4;
}

.selected-input {
    display: none;
}

.submit-btn {
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    padding: 16px 40px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: block;
    margin: 0 auto;
    transition: var(--transition);
    box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
    font-family: 'Montserrat', sans-serif;
}

.submit-btn:hover {
    background: linear-gradient(90deg, var(--primary-dark) 0%, #0c6582 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(37, 99, 235, 0.25);
}

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

.form-footer {
    text-align: center;
    margin-top: 30px;
    color: var(--gray);
    font-size: 0.9rem;
}

.form-footer a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.form-footer a:hover {
    text-decoration: underline;
}

.advantages {
    background-color: white;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    padding: 40px;
    text-align: center;
}

.advantages h2 {
    font-family: 'Montserrat', sans-serif;
    color: var(--primary);
    margin-bottom: 30px;
    font-size: 24px;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.advantage {
    padding: 20px;
}

.advantage i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
    display: block;
}

.advantage h3 {
    font-family: 'Montserrat', sans-serif;
    color: var(--dark);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.advantage p {
    color: var(--gray);
    line-height: 1.5;
}
.option-validate {
    display: none !important;
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 18px;
    cursor: pointer;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    transition: var(--transition);
}

.option-validate:hover {
    background: var(--primary-dark);
}

.option-card.selected .option-validate {
    display: flex;
}

@media (max-width: 768px) {
    .option-card.selected .option-validate {
        display: flex !important;
    }
    .options-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .form-container {
        padding: 30px 20px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
      .submit-btn {
        display: none;
    }
    .submit-btn.active {
        display: block;
    }
    
}

@media (max-width: 480px) {
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .option-card {
        padding: 20px 10px;
    }
    
    .submit-btn {
        width: 100%;
        padding: 14px;
    }
    
    .logo {
        font-size: 28px;
    }
}