:root {
    --nav-ink: #151218;
    --nav-paper: rgba(255, 255, 255, 0.96);
    --nav-accent: #8b2aa7;
    --nav-accent-dark: #64117f;
    --nav-active: #f1e7f5;
}

.chello-header,
.chello-header * {
    box-sizing: border-box;
}

.chello-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    padding: 18px clamp(18px, 4vw, 64px);
    background: #fbf8fc;
    border-bottom: 0;
}

.chello-header__inner {
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(18px, 3vw, 42px);
    width: min(100%, 1440px);
    margin: 0 auto;
}

.chello-logo {
    position: relative;
    display: block;
    width: 64px;
    height: 64px;
    overflow: hidden;
    border-radius: 50%;
    background: #130d18;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);
}

.chello-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(4.25);
    display: block;
}

.chello-nav {
    justify-self: center;
    min-width: 0;
}

.chello-nav ul {
    display: flex;
    align-items: center;
    gap: 3px;
    margin: 0;
    padding: 5px;
    list-style: none;
    border-radius: 999px;
    background: var(--nav-paper);
    box-shadow: 0 12px 35px rgba(18, 10, 23, 0.18);
}

.chello-nav a {
    display: flex;
    align-items: center;
    min-height: 42px;
    padding: 0 clamp(13px, 1.5vw, 22px);
    border-radius: 999px;
    color: var(--nav-ink);
    font-size: clamp(13px, 1.1vw, 16px);
    font-weight: 500;
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
    transition: color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.chello-nav a:hover,
.chello-nav a:focus-visible {
    color: var(--nav-accent-dark);
    background: #f7f1f9;
}

.chello-nav a.is-active {
    color: var(--nav-accent-dark);
    background: var(--nav-active);
}

.chello-contact {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 52px;
    padding: 0 22px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    background: var(--nav-accent);
    box-shadow: 0 12px 28px rgba(112, 24, 139, 0.3);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
    transition: background-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.chello-contact:hover,
.chello-contact:focus-visible {
    color: #fff;
    background: var(--nav-accent-dark);
    box-shadow: 0 15px 34px rgba(112, 24, 139, 0.4);
    transform: translateY(-2px);
}

.chello-contact span {
    font-size: 17px;
}

.chello-menu-toggle {
    display: none;
    width: 48px;
    height: 48px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: var(--nav-paper);
    cursor: pointer;
}

.chello-menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    margin: 5px auto;
    background: var(--nav-ink);
    transition: transform 180ms ease;
}

@media (max-width: 1120px) {
    .chello-header__inner {
        grid-template-columns: 64px minmax(0, 1fr) auto;
        gap: 16px;
    }

    .chello-logo {
        width: 58px;
        height: 58px;
    }

    .chello-nav a {
        padding-inline: 12px;
        font-size: 13px;
    }

    .chello-contact {
        min-height: 48px;
        padding-inline: 17px;
        font-size: 12px;
    }
}

@media (max-width: 900px) {
    .chello-header {
        padding: 12px 18px;
    }

    .chello-header__inner {
        grid-template-columns: 58px 1fr 48px;
    }

    .chello-contact {
        justify-self: end;
    }

    .chello-menu-toggle {
        display: block;
        grid-column: 3;
    }

    .chello-contact {
        display: none;
    }

    .chello-nav {
        position: absolute;
        top: calc(100% + 10px);
        right: 18px;
        left: 18px;
        display: grid;
        visibility: hidden;
        opacity: 0;
        transform: translateY(-8px);
        transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
    }

    .chello-nav ul {
        align-items: stretch;
        flex-direction: column;
        gap: 2px;
        width: 100%;
        padding: 10px;
        border-radius: 24px;
    }

    .chello-nav a {
        min-height: 48px;
        padding-inline: 18px;
        font-size: 15px;
    }

    .menu-is-open .chello-nav {
        visibility: visible;
        opacity: 1;
        transform: translateY(0);
    }

    .menu-is-open .chello-menu-toggle span:first-child {
        transform: translateY(3.5px) rotate(45deg);
    }

    .menu-is-open .chello-menu-toggle span:last-child {
        transform: translateY(-3.5px) rotate(-45deg);
    }
}

@media (max-width: 480px) {
    .chello-header {
        padding-inline: 14px;
    }

    .chello-logo {
        width: 52px;
        height: 52px;
    }

    .chello-header__inner {
        grid-template-columns: 52px 1fr 46px;
    }

    .chello-menu-toggle {
        width: 46px;
        height: 46px;
    }

    .chello-nav {
        right: 14px;
        left: 14px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .chello-nav,
    .chello-nav a,
    .chello-contact,
    .chello-menu-toggle span {
        transition: none;
    }
}