html, body, #app {
    height: 100%;
    margin: 0;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: var(--ink);
    background: #fff;
}

:root {
    --ink: #111;
    --muted-ink: #666;
    --line: #dedede;
    --soft-line: #f0f0f0;
    --surface: #f7f7f5;
}

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

a, .btn-link {
    color: var(--ink);
}

a:hover, .btn-link:hover {
    color: #555;
}

a:focus-visible {
    outline: 2px solid var(--ink);
    outline-offset: 4px;
}

.btn-primary {
    color: #fff;
    background-color: var(--ink);
    border-color: var(--ink);
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 .1rem #fff, 0 0 0 .25rem var(--ink);
}

.content {
    padding-top: 0;
}

h1, h2, h3 {
    letter-spacing: -.035em;
    font-weight: 500;
}

p {
    line-height: 1.7;
}

.hero {
    padding: 8rem 0 9rem;
    border-bottom: 1px solid var(--line);
}

.section-kicker {
    margin: 0 0 1.5rem;
    color: var(--muted-ink);
    font-size: .68rem;
    letter-spacing: .14em;
    line-height: 1.2;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0;
    font-size: clamp(3.8rem, 10vw, 8.5rem);
    line-height: .92;
}

.hero h1 em {
    font-weight: 300;
}

.hero-copy {
    max-width: 28rem;
    margin: 2.5rem 0 0;
    color: var(--muted-ink);
    font-size: 1.15rem;
}

.hero-note {
    margin: 1.25rem 0 0;
    color: var(--muted-ink);
    font-size: .8rem;
    font-style: italic;
}

.intro-section,
.plans {
    display: grid;
    grid-template-columns: minmax(13rem, .8fr) minmax(0, 1.2fr);
    gap: 4rem;
    padding: 6rem 0;
    border-bottom: 1px solid var(--line);
}

.intro-section h2,
.plans h2 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1;
}

.intro-copy {
    max-width: 34rem;
    padding-top: 2rem;
}

.intro-copy p {
    margin: 0 0 1.25rem;
    font-size: 1.15rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    padding: 5rem 0;
    border-bottom: 1px solid var(--line);
}

.feature-grid article {
    padding-right: 1.5rem;
    border-right: 1px solid var(--line);
}

.feature-grid article:last-child {
    border-right: 0;
}

.feature-number {
    color: var(--muted-ink);
    font-size: .75rem;
}

.feature-grid h3 {
    margin: 3rem 0 1rem;
    font-size: 1.35rem;
}

.feature-grid p {
    margin: 0;
    color: var(--muted-ink);
    font-size: .95rem;
}

.plans {
    border-bottom: 0;
}

.plans ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

.plans li {
    display: grid;
    grid-template-columns: 10rem 1fr;
    gap: 1rem;
    padding: 1.1rem 0;
    border-bottom: 1px solid var(--line);
}

.plans li span {
    color: var(--muted-ink);
}

@media (max-width: 640px) {
    .hero {
        padding: 5rem 0 6rem;
    }

    .intro-section,
    .plans {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 4rem 0;
    }

    .intro-copy {
        padding-top: 0;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 0;
        padding: 3rem 0;
    }

    .feature-grid article {
        padding: 2rem 0;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .feature-grid article:first-child {
        padding-top: 0;
    }

    .feature-grid article:last-child {
        border-bottom: 0;
    }

    .feature-grid h3 {
        margin-top: 1.5rem;
    }

    .plans li {
        grid-template-columns: 7rem 1fr;
    }
}

.valid.modified:not([type=checkbox]) {
    outline: 1px solid #26b050;
}

.invalid {
    outline: 1px solid #e50000;
}

.validation-message {
    color: #e50000;
}