@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700&family=Roboto:wght@400;500&display=swap');

:root {
    --background-color: #ffffff;
    --secondary-bg: #f5f5f7;
    --text-color: #1d1d1f;
    --secondary-text-color: #6e6e73;
    --accent-color: #0071e3;
    --border-color: #d2d2d7;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    padding: 0.5rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
}

header.hidden {
    transform: translateY(-100%);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
}

nav ul li {
    margin-left: 2rem;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--accent-color);
}

.language-selector {
    position: relative;
    display: flex;
    align-items: center;
}

.language-button {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.language-button:hover {
    background-color: var(--secondary-bg);
}

.language-button .material-symbols-outlined {
    font-size: 24px;
    color: var(--text-color);
}

.language-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    list-style: none;
    padding: 0.5rem;
    margin: 0.5rem 0 0;
    min-width: 160px;
    z-index: 1001;
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.language-menu.hidden {
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

.language-menu li {
    margin: 0;
}

.language-menu a {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-color);
    text-decoration: none;
    transition: background-color 0.2s ease;
    text-align: left;
}

.language-menu a:hover {
    background-color: var(--secondary-bg);
    color: var(--accent-color);
}

.language-menu a.active {
    font-weight: 600;
    color: var(--accent-color);
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }
    
    nav ul li {
        margin-left: 0;
    }
    
    .language-selector select {
        min-width: 120px;
    }
}

main > section {
    padding: 6rem 1.5rem;
    max-width: 1024px;
    margin: 0 auto;
    text-align: center;
}

.section-header {
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin: 0;
}

.hero {
    padding-top: 8rem;
    padding-bottom: 8rem;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.05;
    margin-bottom: 1.5rem;
}

.hero .subtitle {
    font-size: 1.5rem;
    color: var(--secondary-text-color);
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
}

.cta-button {
    background-color: var(--accent-color);
    color: #fff;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: #0077ed;
}

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

.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    text-align: left;
}

.card {
    background: var(--background-color);
    padding: 2rem;
    border-radius: 20px;
}

.card-icon {
    font-size: 56px;
    color: var(--accent-color);
    background-color: #e8e8ed;
    width: 90px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin: 0 auto 1.5rem auto;
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 0.5rem 0;
}

.card p {
    color: var(--secondary-text-color);
    font-size: 0.95rem;
    margin: 0;
}

.how-it-works-section .steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 4rem;
    text-align: center;
}

.step .step-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 1rem;
    border: 2px solid var(--accent-color);
    width: 40px;
    height: 40px;
    line-height: 40px;
    border-radius: 50%;
    margin: 0 auto 1.5rem auto;
}

.step h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 0.5rem 0;
}

.step p {
    color: var(--secondary-text-color);
    font-size: 0.95rem;
    margin: 0;
}

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

.testimonial-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background-color: var(--background-color);
    padding: 2.5rem;
    border-radius: 20px;
    text-align: left;
}

.testimonial-card p {
    font-size: 1.1rem;
    margin: 0 0 1.5rem 0;
    font-style: italic;
}

.testimonial-card cite {
    font-weight: 600;
    color: var(--secondary-text-color);
}

.download-section h2 {
    font-size: 2.5rem;
    margin: 0 0 1rem 0;
}

.download-section p {
    font-size: 1.2rem;
    color: var(--secondary-text-color);
    margin: 0 auto 2.5rem auto;
    max-width: 500px;
}

.platform-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.platform-button {
    text-decoration: none;
    font-weight: 500;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.platform-button.primary {
    background-color: var(--accent-color);
    color: #fff;
}

.platform-button.primary:hover {
    background-color: #0077ed;
}

.platform-button.secondary {
    background-color: #e8e8ed;
    color: var(--text-color);
}
.platform-button.secondary:hover {
     background-color: #dcdce1;
}

footer {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--secondary-text-color);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}