:root {
    --sg-bg: #0a0f1b;
    --sg-bg-soft: #12192b;
    --sg-panel: rgba(17, 24, 42, 0.9);
    --sg-line: rgba(129, 189, 255, 0.18);
    --sg-text: #eef5ff;
    --sg-muted: #aab6d2;
    --sg-accent: #7ebeff;
    --sg-accent-strong: #52a7ff;
    --sg-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
    --sg-radius: 28px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body.sg-body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--sg-text);
    background:
        radial-gradient(circle at top left, rgba(126, 190, 255, 0.16), transparent 28%),
        radial-gradient(circle at top right, rgba(82, 167, 255, 0.12), transparent 24%),
        linear-gradient(180deg, #07101c 0%, #0c1525 50%, #09111f 100%);
    line-height: 1.6;
}

img {
    display: block;
    max-width: 100%;
}

.sg-shell {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.sg-header {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(16px);
    background: rgba(7, 16, 28, 0.84);
    border-bottom: 1px solid var(--sg-line);
}

.sg-header__inner {
    min-height: 84px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.sg-logo {
    text-decoration: none;
    color: var(--sg-text);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-weight: 800;
    font-size: 1rem;
}

.sg-nav {
    display: flex;
    gap: 26px;
    align-items: center;
}

.sg-nav a,
.sg-footer__links a {
    text-decoration: none;
    color: var(--sg-muted);
    transition: color 0.2s ease, transform 0.2s ease;
}

.sg-nav a:hover,
.sg-footer__links a:hover {
    color: var(--sg-accent);
    transform: translateY(-1px);
}

.sg-disclaimer {
    text-align: center;
    padding: 12px 18px;
    font-size: 0.9rem;
    color: #d9ebff;
    background: linear-gradient(90deg, rgba(126, 190, 255, 0.12), rgba(82, 167, 255, 0.08));
    border-top: 1px solid rgba(126, 190, 255, 0.08);
}

.sg-menu-toggle {
    display: none;
}

.sg-burger {
    display: none;
    width: 46px;
    height: 46px;
    border-radius: 14px;
    border: 1px solid var(--sg-line);
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.sg-burger span {
    width: 18px;
    height: 2px;
    background: var(--sg-text);
}

.sg-hero,
.sg-rhythm,
.sg-comfort,
.sg-plans,
.sg-quote,
.sg-faq,
.sg-contact {
    padding: 88px 0;
}

.sg-hero__grid,
.sg-rhythm__grid,
.sg-comfort__grid,
.sg-contact__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 42px;
    align-items: center;
}

.sg-label {
    margin: 0 0 14px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.82rem;
    color: var(--sg-accent);
}

.sg-hero h1,
.sg-rhythm h2,
.sg-comfort h2,
.sg-plans h2,
.sg-faq h2,
.sg-contact h2 {
    margin: 0 0 18px;
    line-height: 1.08;
}

.sg-hero h1 {
    font-size: clamp(2.2rem, 4vw, 4.4rem);
}

.sg-rhythm h2,
.sg-comfort h2,
.sg-plans h2,
.sg-faq h2,
.sg-contact h2 {
    font-size: clamp(1.8rem, 3vw, 3rem);
}

.sg-lead,
.sg-rhythm p,
.sg-comfort p,
.sg-card p,
.sg-tile p,
.sg-faq p,
.sg-contact p,
.sg-footer p,
.sg-quote__card p {
    color: var(--sg-muted);
}

.sg-hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin: 30px 0 34px;
}

.sg-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    padding: 0 22px;
    border-radius: 999px;
    text-decoration: none;
    border: 1px solid transparent;
    font-weight: 700;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
    cursor: pointer;
}

.sg-btn:hover {
    transform: translateY(-2px);
}

.sg-btn--primary {
    background: linear-gradient(135deg, var(--sg-accent), var(--sg-accent-strong));
    color: #06111d;
    box-shadow: 0 14px 34px rgba(82, 167, 255, 0.24);
}

.sg-btn--ghost {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--sg-line);
    color: var(--sg-text);
}

.sg-metrics,
.sg-card-grid,
.sg-tiles,
.sg-plan-grid,
.sg-faq__list {
    display: grid;
    gap: 18px;
}

.sg-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sg-metrics article,
.sg-card,
.sg-tile,
.sg-plan,
.sg-faq details,
.sg-form,
.sg-quote__card {
    background: var(--sg-panel);
    border: 1px solid var(--sg-line);
    border-radius: var(--sg-radius);
    box-shadow: var(--sg-shadow);
}

.sg-metrics article {
    padding: 18px;
}

.sg-metrics strong {
    display: block;
    font-size: 1.05rem;
    margin-bottom: 4px;
}

.sg-metrics span {
    font-size: 0.92rem;
    color: var(--sg-muted);
}

.sg-frame {
    overflow: hidden;
    border-radius: 34px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--sg-shadow);
    position: relative;
}

.sg-frame::after {
    content: "";
    position: absolute;
    inset: auto 18px 18px auto;
    width: 118px;
    height: 118px;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(126, 190, 255, 0.22), transparent 70%);
    pointer-events: none;
}

.sg-frame img {
    width: 100%;
    object-fit: cover;
    aspect-ratio: 5 / 4;
}

.sg-frame--hero img {
    min-height: 560px;
    aspect-ratio: 5 / 6;
}

.sg-card-grid,
.sg-tiles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sg-card,
.sg-tile,
.sg-plan {
    padding: 24px;
}

.sg-card h3,
.sg-tile h3,
.sg-plan h3 {
    margin: 0 0 10px;
    font-size: 1.18rem;
}

.sg-list {
    margin: 0;
    padding-left: 20px;
    color: var(--sg-muted);
}

.sg-list li + li {
    margin-top: 10px;
}

.sg-plan-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sg-plan--featured {
    border-color: rgba(126, 190, 255, 0.34);
    transform: translateY(-8px);
}

.sg-badge {
    display: inline-flex;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(126, 190, 255, 0.12);
    color: var(--sg-accent);
    font-size: 0.8rem;
    margin-bottom: 16px;
}

.sg-price {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.sg-plan ul {
    margin: 0 0 24px;
    padding-left: 18px;
    color: var(--sg-muted);
}

.sg-plan li + li {
    margin-top: 8px;
}

.sg-quote__card {
    padding: 34px;
    text-align: center;
}

.sg-quote__card p {
    margin: 0 0 14px;
    font-size: clamp(1.15rem, 2vw, 1.6rem);
}

.sg-quote__card span {
    color: var(--sg-accent);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 0.82rem;
}

.sg-faq__list {
    max-width: 920px;
}

.sg-faq details {
    padding: 22px 24px;
}

.sg-faq summary {
    cursor: pointer;
    font-weight: 700;
    list-style: none;
}

.sg-faq summary::-webkit-details-marker {
    display: none;
}

.sg-faq p {
    margin: 14px 0 0;
}

.sg-form {
    padding: 28px;
    display: grid;
    gap: 14px;
}

.sg-form input,
.sg-form textarea {
    width: 100%;
    padding: 15px 16px;
    border-radius: 18px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(8, 14, 25, 0.92);
    color: var(--sg-text);
    font: inherit;
}

.sg-form textarea {
    resize: vertical;
    min-height: 130px;
}

.sg-check {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    color: var(--sg-muted);
    font-size: 0.95rem;
}

.sg-check input {
    width: 18px;
    height: 18px;
    margin-top: 2px;
}

.sg-footer {
    padding: 28px 0 44px;
    border-top: 1px solid var(--sg-line);
}

.sg-footer__inner {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 26px;
}

.sg-footer__links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

@media (max-width: 1080px) {
    .sg-hero__grid,
    .sg-rhythm__grid,
    .sg-comfort__grid,
    .sg-contact__grid,
    .sg-metrics,
    .sg-card-grid,
    .sg-tiles,
    .sg-plan-grid {
        grid-template-columns: 1fr;
    }

    .sg-plan--featured {
        transform: none;
    }
}

@media (max-width: 840px) {
    .sg-shell {
        width: min(100% - 28px, 1180px);
    }

    .sg-burger {
        display: inline-flex;
    }

    .sg-nav {
        position: absolute;
        top: calc(100% + 1px);
        left: 20px;
        right: 20px;
        display: none;
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
        padding: 18px;
        border-radius: 24px;
        background: rgba(7, 16, 28, 0.98);
        border: 1px solid var(--sg-line);
        box-shadow: var(--sg-shadow);
    }

    .sg-menu-toggle:checked ~ .sg-nav {
        display: flex;
    }

    .sg-header__inner {
        position: relative;
    }

    .sg-hero,
    .sg-rhythm,
    .sg-comfort,
    .sg-plans,
    .sg-quote,
    .sg-faq,
    .sg-contact {
        padding: 70px 0;
    }
}

@media (max-width: 640px) {
    .sg-header__inner {
        min-height: 76px;
    }

    .sg-logo {
        letter-spacing: 0.12em;
        font-size: 0.96rem;
    }

    .sg-footer__inner {
        flex-direction: column;
    }
}