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

:root {
    --brand-slate-deep: #33414d;
    --brand-slate-medium: #4d616f;
    --brand-slate-soft: #7d8f9c;
    --brand-mint: #3ecf8e;
    --brand-mint-deep: #24a970;
    --brand-mint-wash: #dff6ec;
    --brand-background: #eef2f4;
    --brand-surface: #ffffff;
    --brand-surface-alt: #f6f9fa;
    --brand-text: #1a232b;
    --brand-text-muted: #5d6d7a;
    --brand-border: #d5dee3;
    --brand-night: #16202a;
    --brand-font-body: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --brand-font-heading: "Century Gothic", "Avenir Next", "Segoe UI", "Trebuchet MS", sans-serif;
    --brand-radius-small: 10px;
    --brand-radius-medium: 18px;
    --brand-radius-large: 28px;
    --brand-shadow-soft: 0 6px 18px rgba(26, 35, 43, .06);
    --brand-shadow-medium: 0 16px 38px rgba(26, 35, 43, .10);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--brand-font-body);
    background:
        radial-gradient(circle at 88% -4%, rgba(62, 207, 142, .14), transparent 38%),
        linear-gradient(180deg, #f7fafb 0%, var(--brand-background) 100%);
    color: var(--brand-text);
    font-size: 16px;
    line-height: 1.75;
    overflow-wrap: break-word;
}

a {
    color: var(--brand-mint-deep);
    text-decoration: none;
    transition: color .2s ease;
}

a:hover {
    color: var(--brand-slate-deep);
}

/* ---------- header ---------- */

.document-header {
    position: relative;
    z-index: 30;
    padding: 20px;
    background: rgba(246, 249, 250, .92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--brand-border);
}

.document-header__inner {
    max-width: 1180px;
    margin: 0 auto;
    text-align: center;
}

.document-header__title {
    font-family: var(--brand-font-heading);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: .26em;
    text-transform: uppercase;
    color: var(--brand-slate-deep);
}

.document-header__title:hover {
    color: var(--brand-mint-deep);
}

/* ---------- intro ---------- */

.document-intro {
    max-width: 1180px;
    margin: 0 auto;
    padding: 54px 24px 34px;
}

.document-intro__label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 15px;
    margin-bottom: 16px;
    border-radius: 999px;
    background: var(--brand-mint-wash);
    border: 1px solid rgba(36, 169, 112, .32);
    color: #1c8058;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .14em;
    text-transform: uppercase;
}

.document-intro__title {
    max-width: 860px;
    font-family: var(--brand-font-heading);
    font-size: clamp(30px, 5vw, 52px);
    font-weight: 700;
    line-height: 1.12;
    color: var(--brand-slate-deep);
    margin-bottom: 14px;
}

.document-intro__summary {
    max-width: 720px;
    font-size: 17px;
    color: var(--brand-text-muted);
}

.document-intro__revision {
    margin-top: 16px;
    font-size: 13px;
    letter-spacing: .04em;
    color: var(--brand-slate-soft);
}

/* ---------- layout ---------- */

.document-layout {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px 90px;
    display: grid;
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
}

.document-layout__sidebar {
    position: sticky;
    top: 26px;
    min-width: 0;
}

.document-navigation {
    background: var(--brand-surface);
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius-medium);
    box-shadow: var(--brand-shadow-soft);
    padding: 20px 18px;
}

.document-navigation__title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--brand-slate-soft);
    margin-bottom: 12px;
}

.document-navigation__list {
    list-style: none;
    display: grid;
    gap: 2px;
}

.document-navigation__link {
    display: block;
    position: relative;
    padding: 8px 10px 8px 14px;
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.45;
    color: var(--brand-slate-medium);
    transition: background .2s ease, color .2s ease;
}

.document-navigation__link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    border-radius: 3px;
    background: var(--brand-mint);
    transition: height .2s ease;
}

.document-navigation__link:hover {
    background: var(--brand-surface-alt);
    color: var(--brand-slate-deep);
}

.document-navigation__link--active {
    background: var(--brand-mint-wash);
    color: var(--brand-slate-deep);
    font-weight: 700;
}

.document-navigation__link--active::before {
    height: 60%;
}

/* ---------- content ---------- */

.document-layout__content {
    min-width: 0;
}

.document-section {
    padding: 34px 0 6px;
    border-top: 1px solid var(--brand-border);
    scroll-margin-top: 24px;
}

.document-section:first-child {
    padding-top: 0;
    border-top: 0;
}

.document-section__title {
    display: flex;
    align-items: baseline;
    gap: 14px;
    font-family: var(--brand-font-heading);
    font-size: clamp(23px, 3.2vw, 34px);
    font-weight: 700;
    line-height: 1.2;
    color: var(--brand-slate-deep);
    margin-bottom: 16px;
}

.document-section__number {
    flex: 0 0 auto;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: .06em;
    color: var(--brand-mint-deep);
}

.document-section p {
    color: var(--brand-text-muted);
    margin-bottom: 14px;
}

.document-section ul,
.document-section ol {
    margin: 0 0 16px;
    padding-left: 22px;
    color: var(--brand-text-muted);
}

.document-section li {
    margin-bottom: 7px;
}

.document-section strong {
    color: var(--brand-text);
}

.document-subtitle {
    font-family: var(--brand-font-heading);
    font-size: 18px;
    font-weight: 700;
    color: var(--brand-text);
    margin: 22px 0 10px;
}

/* ---------- blocks ---------- */

.document-note {
    margin: 22px 0;
    padding: 20px 22px;
    border-radius: var(--brand-radius-medium);
    border: 1px solid rgba(36, 169, 112, .32);
    border-left: 4px solid var(--brand-mint);
    background: linear-gradient(120deg, var(--brand-mint-wash), rgba(255, 255, 255, .92));
}

.document-note p {
    margin: 0;
    color: var(--brand-text);
}

.document-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin: 22px 0;
}

.document-card {
    padding: 20px 18px;
    border-radius: var(--brand-radius-medium);
    border: 1px solid var(--brand-border);
    background: var(--brand-surface);
    box-shadow: var(--brand-shadow-soft);
}

.document-card__title {
    font-family: var(--brand-font-heading);
    font-size: 15px;
    font-weight: 700;
    color: var(--brand-slate-deep);
    margin-bottom: 6px;
}

.document-card__text {
    font-size: 14px;
    line-height: 1.65;
    color: var(--brand-text-muted);
}

.document-table-wrapper {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 20px 0 24px;
}

.document-table {
    width: 100%;
    min-width: 420px;
    border-collapse: collapse;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: var(--brand-shadow-soft);
    background: var(--brand-surface);
}

.document-table th {
    background: linear-gradient(135deg, var(--brand-slate-deep), var(--brand-slate-medium));
    color: #ffffff;
    text-align: left;
    padding: 13px 16px;
    font-size: 14px;
    letter-spacing: .03em;
}

.document-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--brand-border);
    color: var(--brand-text-muted);
    font-size: 15px;
}

.document-table tr:nth-child(even) td {
    background: var(--brand-surface-alt);
}

.document-table tr:last-child td {
    border-bottom: 0;
}

.document-steps {
    counter-reset: document-step;
    display: grid;
    gap: 14px;
    margin: 22px 0;
}

.document-step {
    display: grid;
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
    padding: 18px 20px;
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius-medium);
    background: var(--brand-surface);
    box-shadow: var(--brand-shadow-soft);
}

.document-step__number {
    width: 46px;
    height: 46px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    font-family: var(--brand-font-heading);
    font-size: 17px;
    font-weight: 700;
    color: #08301f;
    background: linear-gradient(135deg, var(--brand-mint) 0%, var(--brand-mint-deep) 100%);
}

.document-step__title {
    font-family: var(--brand-font-heading);
    font-size: 15px;
    font-weight: 700;
    color: var(--brand-text);
    margin-bottom: 3px;
}

.document-step__text {
    font-size: 15px;
    color: var(--brand-text-muted);
}

/* ---------- footer ---------- */

.site-footer {
    margin-top: 0;
    padding: 24px 20px 20px;
    background: #e6ecef;
    border-top: 1px solid var(--brand-border);
    text-align: center;
}

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

.site-footer__navigation {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 22px;
    margin-bottom: 12px;
}

.site-footer__link {
    font-size: 12px;
    color: var(--brand-slate-medium);
}

.site-footer__link:hover {
    color: var(--brand-mint-deep);
}

.site-footer__copyright {
    font-size: 11px;
    color: var(--brand-slate-soft);
    margin-bottom: 8px;
}

.site-footer__legal {
    max-width: 760px;
    margin: 0 auto;
    font-size: 11px;
    line-height: 1.75;
    color: var(--brand-slate-soft);
}

/* ---------- responsive ---------- */

@media (max-width: 960px) {
    .document-layout {
        grid-template-columns: 1fr;
        gap: 24px;
        padding-bottom: 64px;
    }

    .document-intro {
        padding: 40px 24px 22px;
    }

    .document-layout__sidebar {
        position: sticky;
        top: 0;
        z-index: 20;
        min-width: 0;
        margin: 0 -24px;
        padding: 10px 0 8px;
        background: rgba(246, 249, 250, .96);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--brand-border);
    }

    .document-navigation {
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }

    .document-navigation__title {
        display: none;
    }

    .document-navigation__list {
        display: flex;
        flex-wrap: nowrap;
        gap: 8px;
        min-width: 0;
        max-width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding: 2px 24px 6px;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .document-navigation__list::-webkit-scrollbar {
        display: none;
    }

    .document-navigation__item {
        flex: 0 0 auto;
    }

    .document-navigation__link {
        padding: 8px 15px;
        border: 1px solid var(--brand-border);
        border-radius: 999px;
        background: var(--brand-surface);
        white-space: nowrap;
        font-size: 13px;
    }

    .document-navigation__link::before {
        display: none;
    }

    .document-navigation__link--active {
        background: var(--brand-mint-wash);
        border-color: rgba(36, 169, 112, .45);
    }

    .document-section {
        scroll-margin-top: 76px;
    }
}

@media (max-width: 560px) {
    .document-step {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .document-note {
        padding: 16px 18px;
    }
}