:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-color: #000000;
    --secondary-text: #666666;
    --border-color: #e0e0e0;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
}

header.scrolled {
    padding: 1rem 5%;
    border-bottom: 1px solid var(--border-color);
}

.logo img {
    height: 40px;
    width: auto;
}

nav ul {
    display: flex;
    gap: 3rem;
}

nav ul li a {
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

nav ul li a:hover {
    opacity: 0.6;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    padding: 0 5%;
    padding-top: 80px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.hero-image img {
    max-width: 90%;
    height: auto;
    filter: grayscale(100%);
    transition: var(--transition);
}

.hero-image img:hover {
    filter: grayscale(0%);
}

h1 {
    font-size: 5rem;
    font-weight: 800;
    line-height: 0.9;
    margin-bottom: 2rem;
    letter-spacing: -0.03em;
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--secondary-text);
    margin-bottom: 3rem;
    max-width: 400px;
}

.cta-button {
    display: inline-block;
    padding: 1.2rem 3rem;
    background-color: var(--text-color);
    color: var(--bg-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.8rem;
    transition: var(--transition);
}

.cta-button:hover {
    background-color: #333;
    transform: translateY(-2px);
}

/* Sections */
section {
    padding: 10rem 5%;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 4rem;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4rem;
}

.feature-card {
    border-top: 1px solid var(--text-color);
    padding-top: 2rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
}

.feature-card p {
    color: var(--secondary-text);
}

/* Product Details */
.product-details {
    background-color: #f9f9f9;
}

.details-container {
    display: flex;
    gap: 8rem;
    align-items: center;
}

.details-text {
    flex: 1;
}

.details-image {
    flex: 1;
}

.details-image img {
    width: 100%;
    filter: grayscale(100%);
    border: 1px solid var(--border-color);
}

/* Footer */
footer {
    padding: 5rem 5%;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.footer-info h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: right;
}

.copyright {
    margin-top: 4rem;
    font-size: 0.8rem;
    color: var(--secondary-text);
    text-align: center;
    padding-bottom: 2rem;
}

/* Responsive */
@media (max-width: 1024px) {
    h1 {
        font-size: 4rem;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .details-container {
        flex-direction: column;
        gap: 4rem;
    }
}

@media (max-width: 768px) {
    header {
        padding: 1.5rem 5%;
    }

    nav {
        display: none;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        justify-content: center;
    }

    .hero-image {
        justify-content: center;
        margin-top: 4rem;
    }

    h1 {
        font-size: 3rem;
    }

    .hero-tagline {
        margin: 0 auto 3rem;
    }

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

    section {
        padding: 6rem 5%;
    }
}

/* Animations */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}