/* Reset + базовая типографика + переиспользуемые примитивы (кнопки, pill-теги). */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 12px);
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-ink);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    padding-bottom: 4.75rem; /* место под sticky mobile CTA */
}
@media (min-width: 1024px) {
    body { padding-bottom: 0; }
}

img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; margin: 0; }

h1, h2, h3 { font-weight: 800; line-height: 1.15; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.7rem, 1.3rem + 1.6vw, 2.5rem); }
h3 { font-size: 1.15rem; }

.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--color-brand);
    color: #fff;
    padding: 0.75rem 1.25rem;
    z-index: 200;
    border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus {
    left: 0;
}

/* --- Контейнеры --- */
.section-head {
    position: relative;
    max-width: 680px;
    margin: 0 auto 2.5rem;
    padding: 0 1.25rem;
    text-align: center;
}
.section-head__index {
    display: block;
    font-size: clamp(3.5rem, 3rem + 3vw, 5.5rem);
    font-weight: 800;
    line-height: 1;
    color: color-mix(in srgb, var(--color-ink) 6%, transparent);
    margin-bottom: -1.75rem;
    letter-spacing: -0.02em;
}
.section-head__lead {
    margin-top: 0.75rem;
    color: var(--color-ink-muted);
}

section {
    padding: 4.5rem 0;
}
@media (min-width: 1024px) {
    section { padding: 6rem 0; }
}

/* --- Tag pill --- */
.tag-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 1.5px solid color-mix(in srgb, var(--color-ink) 20%, transparent);
    border-radius: var(--radius-pill);
    padding: 0.4rem 1.1rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    border-radius: var(--radius-pill);
    padding: 0.9rem 1.75rem;
    font-weight: 700;
    font-size: 0.95rem;
    white-space: nowrap;
    border: 1.5px solid transparent;
    transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.btn:active { transform: scale(0.96); transition-duration: 0.1s; }
.btn--sm { padding: 0.65rem 1.25rem; font-size: 0.85rem; }
.btn--lg { padding: 1.05rem 2.1rem; font-size: 1rem; }
.btn--block { width: 100%; }

.btn--solid { background: var(--color-brand); color: #fff; }
.btn--solid:hover { background: var(--color-brand-dark); transform: translateY(-2px); }

.btn--outline { background: transparent; color: var(--color-ink); border-color: color-mix(in srgb, var(--color-ink) 25%, transparent); }
.btn--outline:hover { border-color: var(--color-ink); transform: translateY(-2px); }

.btn--light { background: #fff; color: var(--color-ink); }
.btn--light:hover { background: var(--color-brand-soft); transform: translateY(-2px); }

.btn--outline-light { background: transparent; color: #fff; border-color: rgba(255,255,255,0.35); }
.btn--outline-light:hover { border-color: #fff; transform: translateY(-2px); }

.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none !important; }