:root {
    --bg: #ffffff;
    --bg-soft: #f5f5f7;
    --text: #1a1a1a;
    --text-muted: #666666;
    --accent: #1a1a1a;
    --card-border: #e0e0e0;
    --radius: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
}

.nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--card-border);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 64px;
    gap: 24px;
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nav-logo-img {
    height: 28px;
    width: auto;
    max-width: 120px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    transition: color 0.2s;
}

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

.nav-lang {
    border: 1px solid var(--card-border);
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 0.82rem;
    line-height: 1;
}

.nav-lang[aria-current="page"] {
    color: var(--text);
    background: var(--bg-soft);
}

.product-main {
    padding-top: 64px;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

.product-hero {
    padding: 88px 0 72px;
    background: linear-gradient(180deg, #ffffff 0%, #f7f7f8 100%);
    border-bottom: 1px solid var(--card-border);
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.8fr);
    gap: 48px;
    align-items: center;
}

.eyebrow {
    display: inline-block;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: 18px;
}

h1 {
    font-size: clamp(2.4rem, 5vw, 4.2rem);
    line-height: 1.05;
    font-weight: 700;
    margin-bottom: 24px;
    overflow-wrap: break-word;
}

.lead {
    color: var(--text-muted);
    font-size: 1.15rem;
    max-width: 680px;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
}

.btn-primary:hover {
    background: #333333;
    transform: translateY(-1px);
}

.btn-secondary {
    border: 1px solid var(--card-border);
    color: var(--text);
    background: #ffffff;
}

.btn-secondary:hover {
    border-color: var(--text-muted);
    transform: translateY(-1px);
}

.summary-card,
.content-card {
    background: #ffffff;
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 32px;
}

.summary-card h2,
.content-card h2 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.summary-card p,
.content-card p {
    color: var(--text-muted);
}

.summary-list,
.content-card ul {
    display: grid;
    gap: 12px;
    padding-left: 20px;
    color: var(--text-muted);
}

.section {
    padding: 72px 0;
}

.section-soft {
    background: var(--bg-soft);
}

.section-title {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    line-height: 1.15;
    margin-bottom: 16px;
}

.section-intro {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 760px;
    margin-bottom: 32px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
}

.feature {
    background: #ffffff;
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 28px;
}

.feature h3 {
    font-size: 1.05rem;
    margin-bottom: 10px;
}

.feature p {
    color: var(--text-muted);
    font-size: 0.96rem;
}

.faq-list {
    display: grid;
    gap: 16px;
}

.faq-item {
    border-top: 1px solid var(--card-border);
    padding-top: 18px;
}

.faq-item h3 {
    font-size: 1rem;
    margin-bottom: 6px;
}

.faq-item p {
    color: var(--text-muted);
}

footer {
    border-top: 1px solid var(--card-border);
    padding: 36px 24px;
    text-align: center;
    color: var(--text-muted);
}

@media (max-width: 840px) {
    .nav-container {
        align-items: flex-start;
        flex-direction: column;
        padding: 14px 20px;
    }

    .nav-links {
        gap: 16px;
    }

    .product-main {
        padding-top: 104px;
    }

    .product-hero {
        padding: 48px 0;
    }

    .hero-grid,
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .summary-card,
    .content-card,
    .feature {
        padding: 24px;
    }

    .section {
        padding: 48px 0;
    }

    .btn {
        width: 100%;
    }
}