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

:root {
    --primary-color: #D7233E;
    --secondary-color: #FEE1E1;
    --white: #FFFFFF;
    --dark: #333333;
    --text-color: #333333;
    --spacing: 8px;
}

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 800;
    line-height: 1.2;
}

#navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: transparent;
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

#navbar.scrolled {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: calc(var(--spacing) * 2) calc(var(--spacing) * 3);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo img {
    height: 50px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: calc(var(--spacing) * 4);
}

.nav-menu a {
    text-decoration: none;
    color: var(--white);
    font-weight: 600;
    transition: color 0.3s ease;
}

#navbar.scrolled .nav-menu a {
    color: var(--dark);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: calc(var(--spacing) * 1);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--white);
    margin: 3px 0;
    transition: 0.3s;
}

#navbar.scrolled .nav-toggle span {
    background-color: var(--dark);
}

.hero-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background-image: url('https://images.pexels.com/photos/2803160/pexels-photo-2803160.jpeg?auto=compress&cs=tinysrgb&w=1920');
    background-size: cover;
    background-position: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(215, 35, 62, 0.85) 0%, rgba(215, 35, 62, 0.65) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    color: var(--white);
    max-width: 900px;
    padding: calc(var(--spacing) * 3);
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: calc(var(--spacing) * 2);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-content h2 {
    font-size: 2rem;
    margin-bottom: calc(var(--spacing) * 3);
    font-weight: 700;
}

.hero-text {
    font-size: 1.25rem;
    margin-bottom: calc(var(--spacing) * 5);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: calc(var(--spacing) * 2);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: calc(var(--spacing) * 2) calc(var(--spacing) * 4);
    font-size: 1rem;
    font-weight: 700;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Montserrat', sans-serif;
}

.btn-primary {
    background-color: var(--white);
    color: var(--primary-color);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-secondary:hover {
    background-color: var(--white);
    color: var(--primary-color);
}

.btn-light {
    background-color: var(--white);
    color: var(--primary-color);
    font-size: 1.1rem;
    padding: calc(var(--spacing) * 2.5) calc(var(--spacing) * 5);
}

.btn-light:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.3);
}

.btn-secondary-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary-outline:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: calc(var(--spacing) * 10) calc(var(--spacing) * 3);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: calc(var(--spacing) * 4);
    text-align: center;
    color: var(--dark);
}

.about-section {
    background-color: var(--white);
}

.lead-text {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing) * 3);
    text-align: center;
    color: var(--primary-color);
}

.about-section p {
    font-size: 1.1rem;
    margin-bottom: calc(var(--spacing) * 2);
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.objectives {
    margin: calc(var(--spacing) * 6) auto;
    max-width: 700px;
}

.objectives h3 {
    font-size: 1.5rem;
    margin-bottom: calc(var(--spacing) * 3);
    text-align: center;
    color: var(--primary-color);
}

.objectives-list {
    list-style: none;
    padding: 0;
}

.objectives-list li {
    font-size: 1.1rem;
    padding: calc(var(--spacing) * 2);
    margin-bottom: calc(var(--spacing) * 2);
    background-color: var(--secondary-color);
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
}

.cta-text {
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
    color: var(--primary-color);
    margin-top: calc(var(--spacing) * 5);
}

.symptoms-section {
    background-color: var(--secondary-color);
}

.symptoms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: calc(var(--spacing) * 4);
    margin-top: calc(var(--spacing) * 6);
}

.symptom-card {
    background-color: var(--white);
    padding: calc(var(--spacing) * 4);
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.symptom-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(215, 35, 62, 0.2);
}

.symptom-icon {
    font-size: 3rem;
    margin-bottom: calc(var(--spacing) * 2);
}

.symptom-card h3 {
    font-size: 1.2rem;
    margin-bottom: calc(var(--spacing) * 2);
    color: var(--dark);
}

.symptom-card p {
    font-size: 1rem;
    color: #666;
    line-height: 1.6;
}

.participate-section {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
}

.participate-section .section-title {
    color: var(--white);
}

.participate-content {
    max-width: 700px;
    margin: 0 auto;
}

.highlight-text {
    font-size: 1.3rem;
    margin-bottom: calc(var(--spacing) * 3);
    font-weight: 600;
}

.how-works-section {
    background-color: var(--white);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: calc(var(--spacing) * 4);
    margin-top: calc(var(--spacing) * 6);
}

.step-card {
    text-align: center;
    padding: calc(var(--spacing) * 4);
}

.step-number {
    width: 80px;
    height: 80px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 800;
    margin: 0 auto calc(var(--spacing) * 3);
}

.step-card h3 {
    font-size: 1.3rem;
    margin-bottom: calc(var(--spacing) * 2);
    color: var(--dark);
}

.step-card p {
    font-size: 1rem;
    color: #666;
}

.contact-section {
    background-color: var(--dark);
    color: var(--white);
}

.contact-section .container {
    padding: calc(var(--spacing) * 6) calc(var(--spacing) * 3);
}

.contact-section .section-title {
    color: var(--white);
    font-size: 1.8rem;
    margin-bottom: calc(var(--spacing) * 3);
}

.credits-content {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing) * 1);
    text-align: left;
}

.credits-title {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.credits-title .credits-names {
    display: inline;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary-color);
}

.credits-advisor {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.credits-email {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.credits-email a {
    color: var(--white);
    text-decoration: underline;
}

.credits-copyright {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-top: calc(var(--spacing) * 2);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
}

.modal.active {
    display: block;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
}

.modal-content {
    position: relative;
    background-color: var(--white);
    max-width: 600px;
    margin: 5% auto;
    padding: calc(var(--spacing) * 5);
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease;
}

.modal-consent-full {
    max-width: 800px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-scrollable {
    max-height: 60vh;
    overflow-y: auto;
    padding-right: calc(var(--spacing) * 2);
}

.modal-scrollable::-webkit-scrollbar {
    width: 8px;
}

.modal-scrollable::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.modal-scrollable::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.modal-scrollable::-webkit-scrollbar-thumb:hover {
    background: #b01d32;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    top: calc(var(--spacing) * 2);
    right: calc(var(--spacing) * 2);
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--dark);
    transition: color 0.3s ease;
    z-index: 10;
}

.modal-close:hover {
    color: var(--primary-color);
}

.modal-content h2 {
    font-size: 1.8rem;
    margin-bottom: calc(var(--spacing) * 3);
    color: var(--primary-color);
    padding-right: calc(var(--spacing) * 4);
}

.modal-content h3 {
    font-size: 1.3rem;
    margin-bottom: calc(var(--spacing) * 2);
    color: var(--primary-color);
}

.modal-content h4 {
    font-size: 1.1rem;
    margin-top: calc(var(--spacing) * 3);
    margin-bottom: calc(var(--spacing) * 2);
    color: var(--primary-color);
}

.modal-body {
    margin-bottom: calc(var(--spacing) * 4);
}

.modal-body p {
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: calc(var(--spacing) * 2);
    text-align: justify;
}

.modal-body ul {
    margin: calc(var(--spacing) * 2) 0;
    padding-left: calc(var(--spacing) * 3);
}

.modal-body li {
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: calc(var(--spacing) * 1.5);
    text-align: justify;
}

.consent-checkbox {
    margin: calc(var(--spacing) * 4) 0;
    padding: calc(var(--spacing) * 3);
    background-color: var(--secondary-color);
    border-radius: 8px;
    border: 2px solid var(--primary-color);
}

.consent-checkbox label {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    gap: calc(var(--spacing) * 2);
}

.consent-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    min-width: 20px;
    margin-top: 2px;
    cursor: pointer;
}

.consent-checkbox span {
    font-weight: 600;
    color: var(--dark);
    line-height: 1.6;
}

.modal-buttons {
    display: flex;
    gap: calc(var(--spacing) * 2);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: calc(var(--spacing) * 3);
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        padding: calc(var(--spacing) * 3);
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        transition: left 0.3s ease;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu a {
        color: var(--dark);
        padding: calc(var(--spacing) * 2) 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-content h2 {
        font-size: 1.5rem;
    }

    .hero-text {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .symptoms-grid {
        grid-template-columns: 1fr;
    }

    .steps-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        margin: 5% calc(var(--spacing) * 2);
        padding: calc(var(--spacing) * 3);
    }

    .modal-consent-full {
        margin: 2% calc(var(--spacing) * 2);
    }

    .modal-scrollable {
        max-height: 50vh;
    }

    .modal-buttons {
        flex-direction: column;
    }
}