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

:root {
    --sln-steel: #2c3e50;
    --sln-wave: #4a6b8a;
    --sln-cyan: #0f9bb5;
    --sln-type: #1a242e;
    --sln-mist: #61707e;
    --sln-edge: #e0e6eb;
    --sln-light: #fbfcfd;
    --sln-plane: #eceff3;
    --sln-white: #ffffff;
    --sln-deepnight: #121a22;
    --sln-kind-ui: "Century Gothic", "URW Gothic", "Segoe UI", sans-serif;
    --sln-kind-book: Baskerville, "Baskerville Old Face", "Hoefler Text", Georgia, serif;
    --sln-edge-s: 8px;
    --sln-edge-m: 14px;
    --sln-edge-l: 24px;
    --sln-veil-1: 0 8px 21px rgba(26, 36, 46, .08);
    --sln-veil-2: 0 16px 41px rgba(26, 36, 46, .13);
    --sln-veil-3: 0 26px 60px rgba(18, 26, 34, .2);
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--sln-kind-book);
    background:
        radial-gradient(circle at 12% 88%, rgba(15, 155, 181, .12), transparent 32%),
        linear-gradient(180deg, #fbfcfd 0%, #eceff3 100%);
    color: var(--sln-type);
    line-height: 1.75;
    font-size: 17px;
}

a {
    color: var(--sln-steel);
    text-decoration: none;
    transition: color .2s ease;
}
a:hover { color: var(--sln-cyan); }

.sln-crown {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 18px 20px;
    background: rgba(251, 252, 253, .92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(44, 62, 80, .16);
}
.sln-crown__belt {
    max-width: 1160px;
    margin: 0 auto;
    text-align: center;
}
.sln-crown__logo {
    font-family: var(--sln-kind-ui);
    font-size: 21px;
    letter-spacing: .23em;
    text-transform: uppercase;
    font-weight: 900;
    color: var(--sln-steel);
}

.sln-open {
    padding: 74px 20px 46px;
    text-align: center;
}
.sln-open__tab {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 7px 18px;
    border-radius: var(--sln-edge-s);
    background: var(--sln-white);
    border: 1px solid var(--sln-edge);
    box-shadow: var(--sln-veil-1);
    font-family: var(--sln-kind-ui);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .17em;
    text-transform: uppercase;
    color: var(--sln-cyan);
    margin-bottom: 18px;
}
.sln-open__title {
    max-width: 830px;
    margin: 0 auto 14px;
    font-size: clamp(29px, 5vw, 52px);
    line-height: 1.12;
    color: var(--sln-steel);
}
.sln-open__lead {
    max-width: 650px;
    margin: 0 auto;
    color: var(--sln-mist);
    font-size: 17px;
    line-height: 1.8;
}

.sln-body {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 20px 86px;
}
.sln-card {
    background: var(--sln-white);
    border: 1px solid var(--sln-edge);
    border-radius: var(--sln-edge-l);
    box-shadow: var(--sln-veil-2);
    padding: 50px 54px;
}
@media (max-width: 740px) {
    .sln-card { padding: 28px 20px; border-radius: 16px; }
    .sln-open { padding-top: 56px; }
}

.sln-card h2 {
    font-size: clamp(21px, 3vw, 30px);
    line-height: 1.2;
    color: var(--sln-steel);
    margin: 36px 0 14px;
    padding-left: 16px;
    border-left: 5px solid var(--sln-cyan);
}
.sln-card h2:first-child { margin-top: 0; }
.sln-card h3 {
    font-family: var(--sln-kind-ui);
    font-size: 15px;
    letter-spacing: .04em;
    line-height: 1.4;
    color: var(--sln-type);
    margin: 22px 0 10px;
}
.sln-card p {
    color: var(--sln-mist);
    margin-bottom: 15px;
}
.sln-card ul,
.sln-card ol {
    padding-left: 22px;
    margin: 0 0 16px;
    color: var(--sln-mist);
}
.sln-card li { margin-bottom: 7px; }
.sln-card strong { color: var(--sln-type); }

.sln-topline {
    margin: 0 0 30px;
    padding: 22px 24px;
    border-radius: var(--sln-edge-m);
    background: linear-gradient(120deg, rgba(15, 155, 181, .12), rgba(255, 255, 255, .9));
    border: 1px solid rgba(15, 155, 181, .3);
}
.sln-topline__word {
    font-family: var(--sln-kind-ui);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--sln-cyan);
    margin-bottom: 8px;
}
.sln-topline p {
    margin: 0;
    color: var(--sln-type);
    font-size: 16px;
}

.sln-flash {
    margin: 26px 0;
    padding: 20px 22px;
    border-radius: var(--sln-edge-m);
    background: #eef4f7;
    border: 1px solid var(--sln-edge);
    border-bottom: 3px solid var(--sln-wave);
}
.sln-flash p { margin: 0; color: var(--sln-type); }

.sln-grid {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0 26px;
    background: var(--sln-white);
    border: 1px solid var(--sln-edge);
}
.sln-grid th {
    background: var(--sln-steel);
    color: #e8f5f8;
    text-align: left;
    padding: 13px 16px;
    font-family: var(--sln-kind-ui);
    font-size: 12px;
    letter-spacing: .08em;
    text-transform: uppercase;
}
.sln-grid td {
    padding: 13px 16px;
    border-bottom: 1px solid var(--sln-edge);
    color: var(--sln-mist);
    font-size: 16px;
}
.sln-grid tr:nth-child(even) td { background: #f5f8fa; }
.sln-grid tr:last-child td { border-bottom: none; }

.sln-ladder {
    margin: 26px 0;
    display: grid;
    gap: 0;
    border: 1px solid var(--sln-edge);
    border-radius: var(--sln-edge-m);
    overflow: hidden;
}
.sln-ladder__rung {
    display: grid;
    grid-template-columns: 96px 1fr;
    align-items: center;
    border-bottom: 1px solid var(--sln-edge);
}
.sln-ladder__rung:last-child { border-bottom: none; }
.sln-ladder__mark {
    align-self: stretch;
    display: grid;
    place-items: center;
    background: #eef4f7;
    font-family: var(--sln-kind-ui);
    font-size: 11px;
    font-weight: 900;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--sln-wave);
    padding: 16px 8px;
}
.sln-ladder__cont {
    padding: 16px 20px;
}
.sln-ladder__head {
    font-family: var(--sln-kind-ui);
    font-size: 15px;
    font-weight: 900;
    color: var(--sln-type);
    margin-bottom: 3px;
}
.sln-ladder__text {
    font-size: 16px;
    color: var(--sln-mist);
}

.sln-quads {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(205px, 1fr));
    gap: 14px;
    margin: 26px 0;
}
.sln-quad {
    padding: 20px 18px;
    background: var(--sln-plane);
    border-radius: var(--sln-edge-m);
    border-top: 3px solid var(--sln-cyan);
}
.sln-quad__head {
    font-family: var(--sln-kind-ui);
    font-size: 14px;
    font-weight: 900;
    color: var(--sln-steel);
    margin-bottom: 6px;
}
.sln-quad__text {
    font-size: 15px;
    line-height: 1.66;
    color: var(--sln-mist);
}

.sln-floor {
    margin-top: 40px;
    background: var(--sln-plane);
    color: var(--sln-mist);
    padding: 20px 20px 16px;
    font-family: var(--sln-kind-ui);
    text-align: center;
    border-top: 1px solid var(--sln-edge);
}
.sln-floor__belt {
    max-width: 900px;
    margin: 0 auto;
}
.sln-floor__ways {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 20px;
    margin-bottom: 10px;
}
.sln-floor__ways a {
    color: var(--sln-wave);
    font-size: 11px;
}
.sln-floor__ways a:hover { color: var(--sln-cyan); }
.sln-floor__sign {
    font-size: 11px;
    color: var(--sln-mist);
}