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

:root {
    --rb-night: #101a3d;
    --rb-main: #2c3f8f;
    --rb-mint: #4fd1a5;
    --rb-ink: #131629;
    --rb-paper: #f4f6fc;
    --rb-tint: #e3e8f7;
    --rb-dark: #0a1029;
    --rb-mute: #5a6482;
    --rb-edge: #cdd6ee;
    --rb-panel: #ffffff;
    --rb-ui: "Century Gothic", Futura, sans-serif;
    --rb-head: Georgia, "Iowan Old Style", serif;
    --rb-r1: 4px;
    --rb-r2: 14px;
    --rb-r3: 26px;
    --rb-lift1: 0 8px 20px rgba(19, 22, 41, .07);
    --rb-lift2: 0 16px 40px rgba(19, 22, 41, .12);
    --rb-lift3: 0 28px 64px rgba(16, 26, 61, .20);
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--rb-head);
    background: var(--rb-paper);
    color: var(--rb-ink);
    line-height: 1.76;
    font-size: 16px;
}

a {
    color: var(--rb-main);
    text-decoration: none;
    transition: color .2s ease, opacity .2s ease;
}
a:hover { color: var(--rb-mint); }

/* ---------- шапка ---------- */
.rb-mast {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 16px 20px;
    text-align: center;
    background: rgba(16, 26, 61, .94);
    backdrop-filter: blur(14px);
    border-bottom: 2px solid var(--rb-mint);
}
.rb-mast_inner {
    max-width: 1160px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}
.rb-mast_link {
    font-family: var(--rb-ui);
    font-size: 22px;
    letter-spacing: .24em;
    text-transform: uppercase;
    font-weight: 700;
    color: #ffffff;
}
.rb-mast_link:hover { color: var(--rb-mint); }

/* ---------- hero документа ---------- */
.rb-doc_lead {
    padding: 72px 20px 58px;
    text-align: center;
    color: var(--rb-ink);
    background:
        radial-gradient(circle at 50% -10%, rgba(79, 209, 165, .20), transparent 55%),
        linear-gradient(180deg, #ffffff 0%, var(--rb-paper) 100%);
    border-bottom: 1px solid var(--rb-edge);
}
.rb-doc_tag {
    display: inline-block;
    padding: 6px 18px;
    border: 2px solid var(--rb-night);
    background: var(--rb-tint);
    box-shadow: 4px 4px 0 var(--rb-mint);
    font-family: var(--rb-ui);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--rb-night);
    margin-bottom: 24px;
}
.rb-doc_title {
    max-width: 840px;
    margin: 0 auto 22px;
    font-size: clamp(29px, 4.6vw, 50px);
    line-height: 1.18;
    color: var(--rb-night);
}

/* велика декоративна розділова лінія під заголовком */
.rb-doc_rule {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    max-width: 520px;
    margin: 0 auto 22px;
}
.rb-doc_rule span {
    display: block;
    height: 3px;
    flex: 1;
    background: linear-gradient(90deg, transparent, var(--rb-main));
}
.rb-doc_rule span:last-child {
    background: linear-gradient(90deg, var(--rb-main), transparent);
}
.rb-doc_rule i {
    display: block;
    width: 16px;
    height: 16px;
    flex: 0 0 16px;
    background: var(--rb-mint);
    border: 2px solid var(--rb-night);
    transform: rotate(45deg);
}
.rb-doc_sub {
    max-width: 660px;
    margin: 0 auto;
    color: var(--rb-mute);
    font-size: 17px;
    line-height: 1.82;
}

/* ---------- зебра-стрічки на всю ширину ---------- */
.rb-doc_body { display: block; }
.rb-band {
    width: 100%;
    padding: 46px 20px;
    background: var(--rb-paper);
    border-bottom: 1px solid rgba(205, 214, 238, .7);
}
.rb-doc_body .rb-band:nth-child(even) {
    background: linear-gradient(180deg, var(--rb-tint) 0%, #dde4f5 100%);
}
.rb-doc_body .rb-band:last-child { border-bottom: none; }
.rb-doc_sheet {
    max-width: 780px;
    margin: 0 auto;
}

.rb-doc_sheet h2 {
    font-size: clamp(21px, 3vw, 30px);
    line-height: 1.24;
    color: var(--rb-night);
    margin: 0 0 16px;
}
.rb-doc_sheet h3 {
    font-family: var(--rb-ui);
    font-size: 17px;
    font-weight: 700;
    line-height: 1.34;
    color: var(--rb-main);
    margin: 24px 0 10px;
}
.rb-doc_sheet p {
    color: var(--rb-mute);
    margin-bottom: 15px;
}
.rb-doc_sheet p:last-child { margin-bottom: 0; }
.rb-doc_sheet ul,
.rb-doc_sheet ol {
    padding-left: 22px;
    margin: 0 0 16px;
    color: var(--rb-mute);
}
.rb-doc_sheet li { margin-bottom: 8px; }
.rb-doc_sheet li::marker { color: var(--rb-main); }
.rb-doc_sheet strong { color: var(--rb-ink); }

/* ---------- картки ---------- */
.rb-card_grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
    gap: 16px;
    margin: 24px 0;
}
.rb-card_box {
    background: var(--rb-panel);
    border: 2px solid var(--rb-night);
    border-radius: var(--rb-r1);
    padding: 20px 18px;
    box-shadow: 5px 5px 0 rgba(44, 63, 143, .18);
}
.rb-card_title {
    font-family: var(--rb-ui);
    font-size: 14px;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--rb-main);
    margin-bottom: 7px;
}
.rb-card_text {
    font-size: 14px;
    line-height: 1.7;
    color: var(--rb-mute);
}

/* ---------- акцентний блок ---------- */
.rb-note_box {
    margin: 24px 0;
    padding: 20px 22px 20px 24px;
    background: var(--rb-panel);
    border: 2px solid var(--rb-night);
    border-left: 8px solid var(--rb-mint);
    border-radius: var(--rb-r1);
    box-shadow: 6px 6px 0 rgba(16, 26, 61, .14);
}
.rb-note_box p { margin: 0; color: var(--rb-ink); }

/* ---------- таблиця ---------- */
.rb-grid_table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0 24px;
    background: var(--rb-panel);
    border: 2px solid var(--rb-night);
    box-shadow: 6px 6px 0 rgba(44, 63, 143, .16);
}
.rb-grid_table th {
    background: var(--rb-night);
    color: #ffffff;
    text-align: left;
    padding: 13px 16px;
    font-family: var(--rb-ui);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .07em;
    text-transform: uppercase;
}
.rb-grid_table td {
    padding: 13px 16px;
    border-bottom: 1px solid var(--rb-edge);
    color: var(--rb-mute);
    font-size: 15px;
}
.rb-grid_table tr:nth-child(even) td { background: rgba(227, 232, 247, .55); }
.rb-grid_table tr:last-child td { border-bottom: none; }

/* ---------- кроки ---------- */
.rb-step_list {
    margin: 26px 0;
    display: grid;
    gap: 14px;
}
.rb-step_row {
    display: grid;
    grid-template-columns: 50px 1fr;
    gap: 16px;
    align-items: start;
    padding: 18px 20px;
    background: var(--rb-panel);
    border: 2px solid var(--rb-edge);
    border-radius: var(--rb-r1);
    box-shadow: var(--rb-lift1);
}
.rb-step_num {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-family: var(--rb-ui);
    font-size: 18px;
    font-weight: 700;
    color: var(--rb-dark);
    background: var(--rb-mint);
    border: 2px solid var(--rb-night);
}
.rb-step_title {
    font-family: var(--rb-ui);
    font-size: 15px;
    font-weight: 700;
    color: var(--rb-night);
    margin-bottom: 4px;
}
.rb-step_text {
    font-size: 15px;
    color: var(--rb-mute);
}

/* ---------- футер ---------- */
.rb-foot {
    margin-top: 0;
    background: var(--rb-night);
    color: #9fabd0;
    padding: 26px 20px 22px;
    text-align: center;
    border-top: 3px solid var(--rb-mint);
    font-family: var(--rb-ui);
}
.rb-foot_inner {
    max-width: 900px;
    margin: 0 auto;
}
.rb-foot_nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 22px;
    margin-bottom: 12px;
}
.rb-foot_nav a {
    color: #b9c5e6;
    font-size: 11px;
    letter-spacing: .05em;
    text-decoration: none;
}
.rb-foot_nav a:hover { color: var(--rb-mint); }
.rb-foot_legal {
    max-width: 760px;
    margin: 0 auto 12px;
    font-size: 11px;
    line-height: 1.75;
    color: #8593ba;
}
.rb-foot_biz {
    font-size: 11px;
    color: #8593ba;
    line-height: 1.75;
    margin-bottom: 8px;
}
.rb-foot_note {
    font-size: 11px;
    color: #7382ab;
}

@media (max-width: 740px) {
    .rb-band { padding: 34px 18px; }
    .rb-doc_lead { padding: 56px 18px 44px; }
    .rb-step_row { grid-template-columns: 42px 1fr; gap: 12px; padding: 16px; }
    .rb-step_num { width: 42px; height: 42px; font-size: 16px; }
    .rb-grid_table th,
    .rb-grid_table td { padding: 10px 12px; font-size: 14px; }
}