/* Landing vital-book.ru/ — Material Design 3, same green tokens as the Mini App (app.css). */
:root {
    color-scheme: light;
    --primary: #3b6939;
    --primary-press: #2c522b;
    --on-primary: #ffffff;
    --primary-container: #bcf0b4;
    --on-primary-container: #0b2c0d;
    --secondary-container: #d7e8cd;
    --on-surface: #181d17;
    --on-surface-variant: #42493f;
    --outline-variant: #c2c9bd;
    --page: #f7fbf1;
    --surface-lowest: #ffffff;
    --surface-container: #ebefe5;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.12), 0 1px 3px 1px rgba(0, 0, 0, 0.06);
    --font:
        Roboto, system-ui, -apple-system, "Segoe UI", "Helvetica Neue",
        sans-serif;
}
* {
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}
body {
    margin: 0;
    background: var(--page);
    color: var(--on-surface);
    font: 400 16px/24px var(--font);
    letter-spacing: 0.01em;
    -webkit-font-smoothing: antialiased;
}
a {
    color: var(--primary);
}
.wrap {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 20px;
}
.skip {
    position: absolute;
    left: -9999px;
}
.skip:focus {
    left: 16px;
    top: 16px;
    z-index: 10;
    padding: 8px 16px;
    background: var(--surface-lowest);
    border-radius: 8px;
}
a:focus-visible {
    outline: 3px solid rgba(59, 105, 57, 0.55);
    outline-offset: 2px;
}

/* top app bar */
.top {
    position: sticky;
    top: 0;
    z-index: 5;
    background: rgba(247, 251, 241, 0.94);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--outline-variant);
}
.top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 64px;
}
.brand {
    font: 500 20px/28px var(--font);
    color: var(--primary);
}

/* buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    font: 500 15px/20px var(--font);
    text-decoration: none;
    border-radius: 999px;
    transition:
        background-color 0.15s,
        box-shadow 0.15s;
}
.btn.small {
    min-height: 40px;
    padding: 8px 16px;
    font-size: 14px;
}
.btn.filled {
    color: var(--on-primary);
    background: var(--primary);
}
.btn.filled:hover {
    box-shadow: var(--shadow);
}
.btn.filled:active {
    background: var(--primary-press);
}
.btn.tonal {
    color: var(--on-primary-container);
    background: var(--secondary-container);
}
.btn.text {
    color: var(--primary);
}
.btn.text:hover,
.btn.tonal:hover {
    background-color: rgba(59, 105, 57, 0.12);
}

/* hero */
.hero {
    padding: 48px 0 32px;
}
.hero-grid {
    display: grid;
    gap: 32px;
}
h1 {
    margin: 0 0 16px;
    font: 400 36px/44px var(--font); /* display small */
    color: var(--on-surface);
}
.lead {
    margin: 0 0 24px;
    font-size: 18px;
    line-height: 28px;
    color: var(--on-surface-variant);
}
.cta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}
.cta.center {
    justify-content: center;
    margin-top: 40px;
}
.note {
    margin: 16px 0 0;
    font-size: 14px;
    color: var(--on-surface-variant);
}
.steps {
    list-style: none;
    margin: 0;
    padding: 24px;
    background: var(--surface-lowest);
    border-radius: 28px;
    box-shadow: var(--shadow);
}
.steps li {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 12px 0;
}
.steps li + li {
    border-top: 1px solid var(--outline-variant);
}
.num {
    flex: 0 0 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    color: var(--on-primary-container);
    background: var(--primary-container);
    border-radius: 50%;
}

/* desktop block */
.desk {
    padding: 16px 0 32px;
}
.desk-card {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    padding-top: 24px;
    padding-bottom: 24px;
    background: var(--secondary-container);
    border-radius: 28px;
}
.desk-ico {
    font-size: 40px;
    line-height: 1;
}
h2 {
    margin: 0 0 8px;
    font: 400 28px/36px var(--font); /* headline medium */
}
.desk p {
    margin: 0;
    color: var(--on-surface);
}

/* exercises */
.exercises {
    padding: 32px 0 64px;
}
.group {
    margin: 32px 0 12px;
    font: 500 16px/24px var(--font);
    color: var(--primary);
}
.grid {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}
.card {
    display: flex;
    align-items: center;
    gap: 14px;
    min-height: 64px;
    padding: 12px 16px;
    background: var(--surface-lowest);
    border-radius: 12px;
    box-shadow: var(--shadow);
}
.ico {
    flex: 0 0 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    background: var(--surface-container);
    border-radius: 50%;
}

.foot {
    padding: 24px 0 40px;
    border-top: 1px solid var(--outline-variant);
    font-size: 14px;
    color: var(--on-surface-variant);
}
.foot p {
    margin: 0;
}

@media (min-width: 880px) {
    .hero {
        padding: 72px 0 48px;
    }
    .hero-grid {
        grid-template-columns: 1.3fr 1fr;
        align-items: center;
        gap: 56px;
    }
    h1 {
        font-size: 45px;
        line-height: 52px; /* display medium */
    }
    .desk-card {
        padding: 32px 40px;
    }
}
@media (max-width: 480px) {
    .top .btn.small {
        display: none; /* hero CTA is right below */
    }
    h1 {
        font-size: 30px;
        line-height: 38px;
    }
    .desk-card {
        flex-direction: column;
        gap: 8px;
    }
}