:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f7fb;
    --panel: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --accent: #0071e3;
    --accent-soft: rgba(0, 113, 227, 0.08);
    --border: rgba(0, 0, 0, 0.08);
    --shadow: 0 18px 48px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    background:
        radial-gradient(circle at top left, rgba(0, 113, 227, 0.08), transparent 28%),
        linear-gradient(180deg, #fbfcff 0%, #ffffff 32%);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

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

nav {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
    height: 52px;
    background: rgba(255, 255, 255, 0.88);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(18px);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo,
.nav-link,
.nav-cta {
    text-decoration: none;
}

.logo {
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 600;
}

.nav-link {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
}

.nav-cta {
    padding: 0.45rem 0.95rem;
    color: #fff;
    background: var(--accent);
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
}

main {
    max-width: 1120px;
    margin: 0 auto;
    padding: 3.5rem 1.5rem 4rem;
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
    gap: 1.5rem;
    align-items: stretch;
    margin-bottom: 2rem;
}

.hero-card,
.sidebar-card,
.section-card,
.article-card,
.faq-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.hero-card {
    padding: 2.25rem;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.7rem;
    margin-bottom: 1rem;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
}

h1 {
    margin: 0 0 0.9rem;
    font-size: clamp(2rem, 4.2vw, 3.35rem);
    line-height: 1.08;
    letter-spacing: -0.03em;
}

.lead {
    margin: 0 0 1.4rem;
    color: var(--text-secondary);
    font-size: 1.02rem;
    max-width: 46rem;
}

.hero-actions {
    display: flex;
    gap: 0.9rem;
    flex-wrap: wrap;
}

.button-primary,
.button-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 1.15rem;
    border-radius: 999px;
    font-size: 0.92rem;
    font-weight: 600;
    text-decoration: none;
}

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

.button-secondary {
    border: 1px solid var(--border);
    color: var(--text-primary);
    background: #fff;
}

.sidebar-card {
    padding: 1.5rem;
}

.sidebar-card h2 {
    margin: 0 0 0.8rem;
    font-size: 1.05rem;
}

.sidebar-list {
    margin: 0;
    padding-left: 1.1rem;
    color: var(--text-secondary);
}

.sidebar-list li + li {
    margin-top: 0.65rem;
}

.section-card {
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.section-card h2 {
    margin: 0 0 0.65rem;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
}

.section-card p {
    margin: 0;
    color: var(--text-secondary);
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}

.article-card {
    padding: 1.2rem;
}

.article-card h3 {
    margin: 0 0 0.55rem;
    font-size: 1.02rem;
    line-height: 1.35;
}

.article-card h3 a {
    color: var(--text-primary);
    text-decoration: none;
}

.article-card h3 a:hover {
    color: var(--accent);
}

.article-card p {
    margin: 0 0 0.9rem;
    color: var(--text-secondary);
    font-size: 0.94rem;
}

.meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.meta span {
    padding: 0.28rem 0.6rem;
    border-radius: 999px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.78rem;
}

.faq-list {
    display: grid;
    gap: 0.9rem;
}

.faq-card {
    padding: 1rem 1.15rem;
}

.faq-card summary {
    cursor: pointer;
    font-weight: 600;
}

.faq-card p {
    margin: 0.75rem 0 0;
    color: var(--text-secondary);
}

footer {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 1.5rem 2.25rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

@media (max-width: 860px) {
    .hero {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    nav {
        padding: 0 1rem;
    }

    main {
        padding: 2.5rem 1rem 3rem;
    }

    .hero-card,
    .sidebar-card,
    .section-card {
        padding: 1.2rem;
    }
}