:root {
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-secondary: 'Georgia', 'Times New Roman', serif;

    --color-primary: #0057FF;
    --color-primary-dark: #0045CC;
    --color-primary-light: #E6F0FF;
    --color-secondary: #1A202C;
    --color-text: #2D3748;
    --color-text-light: #718096;
    --color-background: #FFFFFF;
    --color-background-alt: #F7FAFC;
    --color-border: #E2E8F0;
    --color-success: #38A169;
    --color-success-light: #EBFDF4;
    --color-white: #FFFFFF;
    --color-black: #000000;

    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;

    --transition-fast: all 0.2s ease-in-out;
    --transition-medium: all 0.3s ease-in-out;
    --transition-slow: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);

    --container-width: 1280px;
    --container-padding: 1.5rem;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 4rem;

    --line-height-normal: 1.6;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: #4299E1;
        --color-primary-dark: #2B6CB0;
        --color-primary-light: #1A365D;
        --color-secondary: #E2E8F0;
        --color-text: #CBD5E0;
        --color-text-light: #A0AEC0;
        --color-background: #1A202C;
        --color-background-alt: #2D3748;
        --color-border: #4A5568;
        --color-success: #68D391;
        --color-success-light: #253F30;
    }
}

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

html {
    scroll-behavior: smooth;
    font-size: 100%;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-medium), color var(--transition-medium);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    color: var(--color-secondary);
    line-height: 1.3;
    font-weight: 700;
    margin-bottom: 1rem;
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

p {
    margin-bottom: 1.25rem;
    color: var(--color-text);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

ul, ol {
    list-style-position: inside;
    padding-left: 1.5rem;
    margin-bottom: 1.25rem;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius-md);
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

.content-section {
    padding-top: 5rem;
    padding-bottom: 5rem;
}

.alternate-bg {
    background-color: var(--color-background-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    margin-bottom: 1rem;
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-block;
    font-weight: 600;
    font-size: var(--font-size-base);
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius-md);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-medium);
    border: 2px solid transparent;
    user-select: none;
    text-decoration: none;
}

.cta-button:hover {
    text-decoration: none;
}

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

.cta-button.primary-cta:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.cta-button.secondary-cta {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.cta-button.secondary-cta:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.cta-button.full-width {
    width: 100%;
    display: block;
}

.grid {
    display: grid;
    gap: 2.5rem;
}

.two-columns {
    grid-template-columns: repeat(1, 1fr);
}

.three-columns {
    grid-template-columns: repeat(1, 1fr);
}

.vertical-align-center {
    align-items: center;
}

.section-divider {
    border: 0;
    height: 1px;
    background-color: var(--color-border);
    max-width: 800px;
    margin: 0 auto;
}

#cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: 1.5rem;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--shadow-xl);
    transform: translateY(100%);
    transition: transform 0.5s ease-in-out;
}

#cookie-banner.visible {
    transform: translateY(0);
}

#cookie-banner p {
    margin: 0;
    font-size: var(--font-size-sm);
}

#cookie-banner a {
    color: var(--color-primary);
    font-weight: 600;
}

#cookie-accept-button {
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-weight: 600;
    white-space: nowrap;
    transition: var(--transition-fast);
}

#cookie-accept-button:hover {
    background-color: var(--color-primary-dark);
}

.main-header {
    background-color: var(--color-background);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 999;
    width: 100%;
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-medium);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-secondary);
    text-decoration: none;
}

.logo svg {
    color: var(--color-primary);
}

.logo:hover {
    text-decoration: none;
    color: var(--color-primary);
}

.main-navigation ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    padding: 0;
    margin: 0;
}

.main-navigation a {
    color: var(--color-text);
    font-weight: 600;
    font-size: var(--font-size-base);
    padding: 0.5rem 0;
    position: relative;
    text-decoration: none;
}

.main-navigation a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-medium);
}

.main-navigation a:hover::after {
    width: 100%;
}

.main-navigation a:hover {
    color: var(--color-secondary);
    text-decoration: none;
}

.hero-section {
    padding: 6rem 0;
    text-align: center;
    background-color: var(--color-background);
}

.hero-section h1 {
    font-size: var(--font-size-5xl);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 1.5rem;
}

.hero-section .subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

#platform-overview img {
    box-shadow: var(--shadow-xl);
    border-radius: var(--border-radius-lg);
}

#platform-overview h3 {
    margin-top: 0;
}

.icon-list {
    list-style: none;
    padding: 0;
    margin-top: 2rem;
}

.icon-list li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: var(--font-size-base);
}

.icon-list svg {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--color-success);
    margin-top: 4px;
}

.card {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    transition: var(--transition-medium);
    height: 100%;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.card-icon {
    margin-bottom: 1.5rem;
}

.card-icon svg {
    width: 48px;
    height: 48px;
    color: var(--color-primary);
}

.card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: 1rem;
}

.card p {
    color: var(--color-text-light);
    font-size: var(--font-size-base);
}

#how-it-works {
    position: relative;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 3px;
    background-color: var(--color-border);
    top: 0;
    bottom: 0;
    left: 1.9rem;
}

.timeline-item {
    padding: 1rem 0 2rem 5rem;
    position: relative;
}

.timeline-icon {
    position: absolute;
    left: 0;
    top: 1rem;
    background-color: var(--color-background);
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    width: 4rem;
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.timeline-icon svg {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.timeline-content h3 {
    margin-top: 0;
    font-size: var(--font-size-lg);
}

.timeline-content p {
    margin-bottom: 0;
    color: var(--color-text-light);
}

.testimonials-grid {
    gap: 2rem;
}

.testimonial-card {
    background-color: var(--color-background-alt);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.testimonial-card .quote {
    font-family: var(--font-secondary);
    font-size: var(--font-size-lg);
    font-style: italic;
    color: var(--color-secondary);
    margin-bottom: 2rem;
    flex-grow: 1;
    position: relative;
    padding-left: 3rem;
}

.testimonial-card .quote::before {
    content: '“';
    font-family: var(--font-secondary);
    font-size: 5rem;
    color: var(--color-primary-light);
    position: absolute;
    left: -0.5rem;
    top: -1.5rem;
    line-height: 1;
    z-index: 0;
}

.testimonial-card .author {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.author-name {
    display: block;
    font-weight: 700;
    color: var(--color-secondary);
}

.author-title {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

#faq {
    padding-bottom: 3rem;
}

.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.faq-item {
    border-bottom: 1px solid var(--color-border);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    width: 100%;
    background-color: var(--color-background);
    border: none;
    text-align: left;
    padding: 1.5rem 2rem;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-secondary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color var(--transition-fast);
}

.faq-question:hover {
    background-color: var(--color-background-alt);
}

.faq-icon {
    transition: transform var(--transition-medium);
    flex-shrink: 0;
    margin-left: 1rem;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-in-out, padding 0.5s ease-in-out;
    background-color: var(--color-background-alt);
}

.faq-answer p {
    padding: 0 2rem 1.5rem 2rem;
    margin: 0;
    color: var(--color-text-light);
}

.faq-more-info {
    text-align: center;
    margin-top: 3rem;
    font-size: var(--font-size-base);
}

#registration img {
    box-shadow: none;
}

.registration-form {
    background-color: var(--color-background);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: var(--font-size-sm);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    background-color: var(--color-background);
    color: var(--color-text);
    transition: var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.checkbox-group input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    accent-color: var(--color-primary);
}

.checkbox-group label {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.thank-you-box {
    background-color: var(--color-success-light);
    border: 1px solid var(--color-success);
    color: var(--color-success);
    padding: 2.5rem;
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.thank-you-box svg {
    margin: 0 auto 1.5rem auto;
}

.thank-you-box h3 {
    color: var(--color-success);
}

.thank-you-box p {
    color: var(--color-text);
    margin: 0;
}

#team {
    background-color: var(--color-background);
}

.team-member-card {
    background-color: var(--color-background-alt);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    text-align: center;
    border: 1px solid var(--color-border);
}

.team-member-card h4 {
    font-size: var(--font-size-lg);
    margin-bottom: 0.25rem;
}

.team-member-card .role {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.team-member-card .bio {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: 0;
}

.main-footer {
    background-color: var(--color-secondary);
    color: var(--color-text-light);
    padding: 5rem 0 2rem 0;
    font-size: var(--font-size-sm);
}

.footer-grid {
    display: grid;
    gap: 3rem;
    grid-template-columns: repeat(1, 1fr);
    margin-bottom: 4rem;
}

.footer-column h4 {
    color: var(--color-white);
    font-size: var(--font-size-lg);
    margin-bottom: 1.5rem;
}

.footer-column p,
.footer-column address {
    margin: 0;
    font-style: normal;
    line-height: var(--line-height-normal);
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column ul li {
    margin-bottom: 0.75rem;
}

.footer-column a {
    color: var(--color-text-light);
    text-decoration: none;
}

.footer-column a:hover {
    color: var(--color-white);
    text-decoration: underline;
}

.about-column {
    grid-column: span 1;
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: var(--color-text-light);
    display: inline-block;
}

.social-links a:hover {
    color: var(--color-white);
    transform: translateY(-2px);
}

@media (min-width: 640px) {
    h1 {
        font-size: var(--font-size-5xl);
    }
    .two-columns {
        grid-template-columns: repeat(2, 1fr);
    }
    .testimonials-grid {
        grid-template-columns: repeat(1, 1fr);
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .about-column {
        grid-column: span 2;
    }
}

@media (min-width: 768px) {
    .three-columns {
        grid-template-columns: repeat(2, 1fr);
    }
    .team-member-card {
        text-align: left;
    }
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 2rem;
    }
    .about-column {
        grid-column: span 1;
    }
}

@media (min-width: 1024px) {
    .three-columns {
        grid-template-columns: repeat(3, 1fr);
    }
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero-section h1 {
        font-size: var(--font-size-6xl);
    }
}

@media (max-width: 768px) {
    .main-header .container {
        flex-direction: column;
        gap: 1rem;
    }
    .main-navigation ul {
        gap: 1.5rem;
    }
    .header-cta {
        display: none;
    }
    .hero-section {
        padding: 4rem 0;
    }
    .hero-section h1 {
        font-size: var(--font-size-4xl);
    }
    .content-section {
        padding: 3rem 0;
    }
    .section-header {
        margin-bottom: 2.5rem;
    }
    .timeline::after {
        left: 1.4rem;
    }
    .timeline-item {
        padding-left: 4rem;
    }
    .timeline-icon {
        width: 3rem;
        height: 3rem;
    }
    .timeline-icon svg {
        width: 24px;
        height: 24px;
    }
    #cookie-banner {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 0.95rem;
    }
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .hero-section h1 {
        font-size: 2.5rem;
    }
    .hero-buttons {
        flex-direction: column;
        gap: 1rem;
    }
    .cta-button {
        width: 100%;
    }
    .main-navigation ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem 1rem;
    }
    .card, .testimonial-card, .registration-form {
        padding: 1.5rem;
    }
    .testimonial-card .quote {
        padding-left: 0;
    }
    .testimonial-card .quote::before {
        display: none;
    }
    .faq-question {
        padding: 1rem 1.5rem;
        font-size: var(--font-size-base);
    }
    .faq-answer p {
        padding: 0 1.5rem 1rem 1.5rem;
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}