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

:root {
    --text: #1d1d1f;
    --text-secondary: #6e6e73;
    --bg: #fbfbfd;
    --border: #e8e8ed;
    --accent: #0071e3;
    --max-width: 680px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Nav */
nav {
    position: sticky;
    top: 0;
    background: rgba(251, 251, 253, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.nav-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Main content */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero (index page) */
.hero {
    text-align: center;
    padding: 120px 0 80px;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
}

.hero .subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero .links {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.hero .links a {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
}

.hero .links a:hover {
    text-decoration: underline;
}

/* Page content (FAQ, Privacy) */
.page-header {
    padding: 80px 0 40px;
    text-align: center;
}

.page-header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 8px;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.0625rem;
}

.content {
    padding-bottom: 80px;
}

.content h2 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-top: 48px;
    margin-bottom: 12px;
}

.content h2:first-child {
    margin-top: 0;
}

.content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.9375rem;
}

.content ul {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 16px;
    padding-left: 20px;
}

.content li {
    margin-bottom: 6px;
}

.content strong {
    color: var(--text);
    font-weight: 600;
}

/* FAQ specific */
.faq-item {
    border-top: 1px solid var(--border);
    padding: 28px 0;
}

.faq-item:last-child {
    border-bottom: 1px solid var(--border);
}

.faq-item h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.faq-item p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* Divider */
.divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 48px 0;
}

/* Footer */
footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 24px;
    border-top: 1px solid var(--border);
}

footer p {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8125rem;
}

/* Responsive */
@media (max-width: 600px) {
    .hero {
        padding: 80px 0 60px;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .page-header {
        padding: 60px 0 32px;
    }

    .page-header h1 {
        font-size: 1.75rem;
    }
}