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

:root {
    --color-brand: #0A84FF;
    --color-brand-dark: #0066CC;
    --color-bg: #F2F2F7;
    --color-surface: #FFFFFF;
    --color-text-primary: #1C1C1E;
    --color-text-secondary: #6C6C70;
    --color-text-tertiary: #AEAEB2;
    --color-border: #E5E5EA;

    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-xxl: 48px;

    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-system);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

a:hover {
    text-decoration: underline;
}

/* ── Navigation ─────────────────────────────────────────── */
.nav {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-brand);
    letter-spacing: -0.02em;
}

.nav-badge {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    padding: var(--space-xs) var(--space-sm);
    border-radius: 999px;
    border: 1px solid var(--color-border);
}

/* ── Hero ────────────────────────────────────────────────── */
.hero {
    background: linear-gradient(160deg, #FFFFFF 0%, #EBF4FF 100%);
    padding: var(--space-xxl) var(--space-xl);
    text-align: center;
}

.hero-inner {
    max-width: 640px;
    margin: 0 auto;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-brand);
    margin-bottom: var(--space-md);
    background: rgba(10, 132, 255, 0.08);
    padding: var(--space-xs) var(--space-md);
    border-radius: 999px;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.hero h1 .accent {
    color: var(--color-brand);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 480px;
    margin: 0 auto var(--space-xl);
    line-height: 1.65;
}

.cta-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--color-brand);
    color: #FFFFFF;
    font-size: 1rem;
    font-weight: 600;
    padding: 14px var(--space-xl);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: background 0.15s ease, transform 0.1s ease;
    text-decoration: none;
    min-width: 220px;
}

.btn-primary:hover {
    background: var(--color-brand-dark);
    text-decoration: none;
    transform: translateY(-1px);
}

.cta-note {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
}

/* ── Features ────────────────────────────────────────────── */
.features {
    max-width: 960px;
    margin: 0 auto;
    padding: var(--space-xxl) var(--space-xl);
}

.section-label {
    text-align: center;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-md);
}

.section-title {
    text-align: center;
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-xxl);
    color: var(--color-text-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-lg);
}

.feature-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-border);
    transition: transform 0.15s ease;
}

.feature-card:hover {
    transform: translateY(-2px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: rgba(10, 132, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

.feature-card p {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ── How it works ────────────────────────────────────────── */
.how-it-works {
    background: var(--color-surface);
    padding: var(--space-xxl) var(--space-xl);
}

.steps {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.step {
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
}

.step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-brand);
    color: #FFF;
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.step-content h3 {
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.step-content p {
    color: var(--color-text-secondary);
    font-size: 0.925rem;
}

/* ── CTA Banner ──────────────────────────────────────────── */
.cta-banner {
    background: linear-gradient(135deg, var(--color-brand) 0%, #0066CC 100%);
    padding: var(--space-xxl) var(--space-xl);
    text-align: center;
    color: #FFF;
}

.cta-banner h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.cta-banner p {
    font-size: 1.05rem;
    opacity: 0.85;
    margin-bottom: var(--space-xl);
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.btn-white {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #FFFFFF;
    color: var(--color-brand);
    font-size: 1rem;
    font-weight: 600;
    padding: 14px var(--space-xl);
    border-radius: var(--radius-md);
    text-decoration: none;
    min-width: 220px;
    transition: opacity 0.15s ease;
}

.btn-white:hover {
    opacity: 0.9;
    text-decoration: none;
}

/* ── Footer ──────────────────────────────────────────────── */
footer {
    background: var(--color-text-primary);
    color: var(--color-text-tertiary);
    padding: var(--space-xl);
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
    transition: color 0.15s;
}

.footer-links a:hover {
    color: #FFF;
    text-decoration: none;
}

.footer-copy {
    font-size: 0.8rem;
    opacity: 0.6;
}

/* ── Placeholder pages ───────────────────────────────────── */
.page-container {
    max-width: 720px;
    margin: var(--space-xxl) auto;
    padding: 0 var(--space-xl);
}

.page-container h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.page-container p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 600px) {
    .nav {
        padding: var(--space-md);
    }

    .hero {
        padding: var(--space-xxl) var(--space-md);
    }

    .features {
        padding: var(--space-xxl) var(--space-md);
    }

    .how-it-works {
        padding: var(--space-xxl) var(--space-md);
    }

    .step {
        flex-direction: column;
        gap: var(--space-sm);
    }

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