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

:root {
    --trn-primary: #0f5f5c;
    --trn-secondary: #17837f;
    --trn-accent: #e2653c;
    --trn-ink: #16232b;
    --trn-surface: #f2f8f6;
    --trn-paper: #ffffff;
    --trn-muted: #56666e;
    --trn-line: #d5e6e1;
    --trn-ui: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --trn-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
    --trn-r1: 10px;
    --trn-r2: 16px;
    --trn-r3: 26px;
    --trn-sh1: 0 8px 20px rgba(15, 95, 92, .08);
    --trn-sh2: 0 16px 38px rgba(15, 95, 92, .13);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--trn-ui);
    background:
        radial-gradient(circle at 12% 4%, rgba(23, 131, 127, .14), transparent 42%),
        radial-gradient(circle at 92% 12%, rgba(226, 101, 60, .10), transparent 38%),
        linear-gradient(180deg, #ffffff 0%, #f2f8f6 62%, #e6f1ee 100%);
    color: var(--trn-ink);
    font-size: 16px;
    line-height: 1.74;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--trn-primary);
    text-decoration: none;
    transition: color .2s ease;
}

a:hover {
    color: var(--trn-accent);
}

/* ---------- шапка ---------- */

.trn-topbar {
    position: sticky;
    top: 0;
    z-index: 90;
    padding: 16px 20px;
    background: rgba(255, 255, 255, .90);
    backdrop-filter: blur(12px);
    border-bottom: 2px solid rgba(15, 95, 92, .14);
}

.trn-topbar__inner {
    max-width: 1120px;
    margin: 0 auto;
    text-align: center;
}

.trn-topbar__logo {
    display: inline-block;
    font-family: var(--trn-serif);
    font-size: 23px;
    font-weight: 700;
    letter-spacing: .06em;
    color: var(--trn-primary);
    border-bottom: 3px solid var(--trn-accent);
    padding-bottom: 2px;
}

/* ---------- вступний блок ---------- */

.trn-lead {
    padding: 64px 20px 40px;
    text-align: center;
}

.trn-lead__tag {
    display: inline-block;
    margin: 0 auto 16px;
    padding: 6px 18px;
    border-radius: 999px;
    background: var(--trn-surface);
    border: 1px solid rgba(15, 95, 92, .22);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--trn-secondary);
}

.trn-lead__title {
    max-width: 800px;
    margin: 0 auto 14px;
    font-family: var(--trn-serif);
    font-weight: 700;
    font-size: clamp(27px, 4.4vw, 46px);
    line-height: 1.16;
    color: var(--trn-primary);
    text-align: center;
}

.trn-lead__note {
    max-width: 620px;
    margin: 0 auto 16px;
    color: var(--trn-muted);
    font-size: 16px;
}

.trn-lead__stamp {
    display: inline-block;
    padding: 5px 16px;
    border-radius: var(--trn-r1);
    background: rgba(226, 101, 60, .12);
    border: 1px dashed rgba(226, 101, 60, .5);
    font-size: 13px;
    font-weight: 700;
    color: #b3441f;
}

/* ---------- нумеровані секції ---------- */

.trn-doc {
    max-width: 940px;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px 96px;
}

.trn-doc__section {
    display: grid;
    grid-template-columns: 96px 1fr;
    gap: 22px;
    align-items: start;
    padding: 26px 0 24px;
    border-bottom: 1px solid var(--trn-line);
}

.trn-doc__section:last-child {
    border-bottom: none;
}

.trn-doc__num {
    font-family: var(--trn-serif);
    font-size: 60px;
    font-weight: 700;
    line-height: 1;
    color: rgba(15, 95, 92, .26);
    text-align: center;
    padding-top: 4px;
}

.trn-doc__body {
    min-width: 0;
}

.trn-doc__title {
    font-family: var(--trn-serif);
    font-size: clamp(20px, 2.6vw, 27px);
    font-weight: 700;
    line-height: 1.24;
    color: var(--trn-primary);
    margin-bottom: 10px;
}

.trn-doc__sign {
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--trn-secondary);
    margin-bottom: 12px;
}

.trn-doc__body h3 {
    font-family: var(--trn-ui);
    font-size: 17px;
    font-weight: 800;
    color: var(--trn-ink);
    margin: 18px 0 8px;
}

.trn-doc__body p {
    color: var(--trn-muted);
    margin-bottom: 13px;
}

.trn-doc__body p:last-child {
    margin-bottom: 0;
}

.trn-doc__body strong {
    color: var(--trn-ink);
}

.trn-doc__list {
    margin: 0 0 14px;
    padding-left: 22px;
    color: var(--trn-muted);
}

.trn-doc__list li {
    margin-bottom: 7px;
}

.trn-doc__list li::marker {
    color: var(--trn-accent);
}

@media (max-width: 700px) {
    .trn-doc__section {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .trn-doc__num {
        font-size: 40px;
        text-align: center;
    }

    .trn-lead {
        padding-top: 44px;
    }
}

/* ---------- виносні блоки ---------- */

.trn-callout {
    margin: 16px 0;
    padding: 18px 20px;
    border-radius: var(--trn-r2);
    background: var(--trn-surface);
    border-left: 5px solid var(--trn-secondary);
    box-shadow: var(--trn-sh1);
}

.trn-callout p {
    margin: 0;
    color: var(--trn-ink);
}

.trn-callout--warn {
    background: rgba(226, 101, 60, .09);
    border-left-color: var(--trn-accent);
}

.trn-pairs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 14px;
    margin: 16px 0;
}

.trn-pairs__item {
    padding: 16px 18px;
    background: var(--trn-paper);
    border: 1px solid var(--trn-line);
    border-radius: var(--trn-r2);
    box-shadow: var(--trn-sh1);
}

.trn-pairs__key {
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--trn-secondary);
    margin-bottom: 6px;
}

.trn-pairs__value {
    font-size: 15px;
    line-height: 1.62;
    color: var(--trn-muted);
}

.trn-steps {
    counter-reset: trn-step;
    margin: 16px 0;
    padding: 0;
    list-style: none;
}

.trn-steps li {
    counter-increment: trn-step;
    position: relative;
    padding: 10px 0 10px 46px;
    color: var(--trn-muted);
}

.trn-steps li::before {
    content: counter(trn-step);
    position: absolute;
    left: 0;
    top: 10px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--trn-primary);
    color: #ffffff;
    font-size: 14px;
    font-weight: 800;
}

/* ---------- футер ---------- */

.trn-footer {
    margin-top: auto;
    flex-shrink: 0;
    background: var(--trn-ink);
    color: rgba(255, 255, 255, .62);
    padding: 24px 20px 20px;
    text-align: center;
    border-top: 4px solid var(--trn-primary);
}

.trn-footer__inner {
    max-width: 900px;
    margin: 0 auto;
}

.trn-footer__nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 22px;
    margin-bottom: 12px;
}

.trn-footer__nav a {
    color: rgba(255, 255, 255, .74);
    font-size: 12px;
}

.trn-footer__nav a:hover {
    color: var(--trn-accent);
}

.trn-footer__copy {
    font-size: 12px;
    color: rgba(255, 255, 255, .50);
}