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

:root {
    --color-bg: #f5f5f7;
    --color-surface: #ffffff;
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-accent: #0071e3;
    --color-accent-purple: #a259ff;
    --color-border: rgba(0, 0, 0, 0.08);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 1120px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(245, 245, 247, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 13px;
    font-weight: 400;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--color-text);
}

/* Hero */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(180deg, #f1f3f3 0%, #c5c5c7 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 0 40px;
}

.hero-title {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.05;
    background: linear-gradient(180deg, #1d1d1f 0%, #6e6e73 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 22px);
    color: var(--color-text-secondary);
    font-weight: 400;
    letter-spacing: 0.02em;
}

.hero-gradient {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 113, 227, 0.06) 0%, rgba(162, 89, 255, 0.03) 40%, transparent 70%);
    pointer-events: none;
    z-index: 1;
}

/* Sections */
.section {
    padding: 140px 0;
}

.section-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 20px;
}

.section-title {
    font-size: clamp(36px, 5vw, 64px);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 32px;
}

.section-description {
    font-size: 18px;
    line-height: 1.7;
    color: var(--color-text-secondary);
    max-width: 680px;
}

/* About */
.about {
    border-top: 1px solid var(--color-border);
    background-color: #ffffff;
}

/* Products */
.products {
    border-top: 1px solid var(--color-border);
    background-color: #f5f5f7;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 60px;
}

.product-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 48px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
    border-color: rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

.product-icon {
    width: 48px;
    height: 48px;
    color: var(--color-accent);
    margin-bottom: 24px;
}

.product-title {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.product-desc {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-secondary);
}

/* Philosophy */
.philosophy {
    border-top: 1px solid var(--color-border);
    background-color: #ffffff;
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
    margin-top: 60px;
}

.philosophy-item {
    position: relative;
}

.philosophy-number {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-accent);
    display: block;
    margin-bottom: 16px;
}

.philosophy-item h3 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.philosophy-item p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Vision */
.vision {
    border-top: 1px solid var(--color-border);
    text-align: center;
    background: linear-gradient(180deg, #f0f0f3 0%, #e8e8ed 100%);
}

.vision-text {
    font-size: clamp(28px, 4vw, 48px);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.3;
    color: var(--color-text-secondary);
}

.text-gradient {
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Contact */
.contact {
    border-top: 1px solid var(--color-border);
    background-color: #1d1d1f;
    color: #f5f5f7;
}

.contact .section-label {
    color: #64d2ff;
}

.contact .section-title {
    color: #f5f5f7;
}

.contact .contact-item h4 {
    color: #a1a1a6;
}

.contact .contact-item p {
    color: #f5f5f7;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
    margin-top: 48px;
}

.contact-item h4 {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 12px;
}

.contact-item p {
    font-size: 17px;
    line-height: 1.6;
    color: var(--color-text);
}

.contact-item a {
    color: var(--color-accent);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.contact-item a:hover {
    opacity: 0.8;
}

/* Footer */
.footer {
    border-top: none;
    padding: 32px 0;
    background-color: #1d1d1f;
    color: #f5f5f7;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-logo {
    font-size: 14px;
    font-weight: 500;
    color: #f5f5f7;
}

.footer-copy {
    font-size: 12px;
    color: #a1a1a6;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 24px;
    }

    .nav-container {
        padding: 0 24px;
    }

    .section {
        padding: 100px 0;
    }

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

    .philosophy-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-content {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .product-card {
        padding: 32px;
    }
}

@media (max-width: 480px) {
    .nav-links {
        gap: 20px;
    }

    .nav-links a {
        font-size: 12px;
    }
}