.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding-top: 30px;
    transition: padding 0.28s ease;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.8rem;
    min-height: 4.7rem;
    margin-top: 0;
    padding: 0.45rem 0;
    border: 1px solid transparent;
    border-radius: 999px;
    background: transparent;
    backdrop-filter: blur(0);
    -webkit-backdrop-filter: blur(0);
    box-shadow: none;
    transition:
        padding 0.28s ease,
        border-color 0.28s ease,
        background 0.28s ease,
        box-shadow 0.28s ease,
        backdrop-filter 0.28s ease;
}

.site-header.is-scrolled {
    padding-top: 30px;
}

.site-header.is-scrolled .header-inner {
    padding: 0.45rem 0.55rem 0.45rem 0.95rem;
    border-color: rgba(255, 255, 255, 0.72);
    background: rgba(240, 240, 240, 0.48);
    backdrop-filter: blur(18px) saturate(135%);
    -webkit-backdrop-filter: blur(18px) saturate(135%);
    box-shadow:
        0 1.8rem 3rem rgba(0, 0, 0, 0.08),
        0 0.1rem 0.3rem rgba(11, 32, 103, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.92);
}

.brand {
    display: flex;
    align-items: center;
    flex: 0 0 auto;
    border: 1px solid transparent;
    border-radius: 999px;
    transition: padding 0.28s ease;
}

.brand-logo {
    display: block;
    width: auto;
    height: 6.45rem;
    margin-left: 10px;
    transition: height 0.42s cubic-bezier(0.22, 1, 0.36, 1), margin 0.32s ease;
}

.site-header.is-scrolled .brand-logo {
    height: 3.15rem;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.25rem;
    flex: 1;
    flex-wrap: nowrap;
    border: 1px solid transparent;
    border-radius: 999px;
    transition: padding 0.28s ease;
}

.site-nav a {
    color: var(--text-main);
    padding: 0.72rem 0.78rem;
    border-radius: 999px;
    border: 1.5px solid transparent;
    transition: 0.25s ease;
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: -0.03em;
    white-space: nowrap;
    margin-right: 6px;
}

.site-nav a:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.22);
}

.site-nav a.is-active {
    color: white;
    background: rgba(36, 36, 36, 1);
}

.nav-toggle {
    display: none;
    width: 3.15rem;
    height: 3.15rem;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    flex-direction: column;
    gap: 0.34rem;
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.38);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.92),
        0 0.85rem 1.45rem rgba(13, 22, 42, 0.12);
    backdrop-filter: blur(16px) saturate(135%);
    -webkit-backdrop-filter: blur(16px) saturate(135%);
    cursor: pointer;
    transition: background 0.24s ease, box-shadow 0.24s ease, transform 0.24s ease;
}

.nav-toggle span {
    width: 1.38rem;
    height: 2px;
    display: block;
    border-radius: 999px;
    background: var(--text-main);
    transition: transform 0.24s ease, opacity 0.2s ease;
}

.nav-toggle:hover {
    transform: translateY(-1px);
    background: rgba(255, 255, 255, 0.56);
}

.site-header.is-nav-open .nav-toggle span:nth-child(1) {
    transform: translateY(0.44rem) rotate(45deg);
}

.site-header.is-nav-open .nav-toggle span:nth-child(2) {
    opacity: 0;
}

.site-header.is-nav-open .nav-toggle span:nth-child(3) {
    transform: translateY(-0.44rem) rotate(-45deg);
}

.site-header:not(.is-scrolled) .site-nav {
    border-color: rgba(255, 255, 255, 0.72);
    background: rgba(240, 240, 240, 0.42);
    backdrop-filter: blur(18px) saturate(135%);
    -webkit-backdrop-filter: blur(18px) saturate(135%);
    box-shadow:
        0 1.1rem 2rem rgba(0, 0, 0, 0.06),
        0 0.1rem 0.3rem rgba(11, 32, 103, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.site-header:not(.is-scrolled) .site-nav {
    flex: 0 1 auto;
    padding: 0.38rem 0.48rem;
}

.site-header.is-scrolled .brand,
.site-header.is-scrolled .site-nav {
    padding: 0;
    border-color: transparent;
    border-radius: 0;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    box-shadow: none;
    transition: none;
}

.site-header:not(.is-scrolled) .site-nav a:hover {
    background: rgba(255, 255, 255, 0.22);
    color: rgba(36, 36, 36, 0.82);
}

.site-header:not(.is-scrolled) .site-nav a.is-active {
    color: white;
    background: rgba(36, 36, 36, 1);
}

@media (max-width: 1040px) {
    .header-inner {
        min-height: auto;
        padding-inline: 0;
    }

    .site-nav {
        gap: 0.15rem;
    }

    .site-nav a {
        padding-inline: 0.8rem;
        font-size: 0.92rem;
    }

    .brand-logo {
        height: 5.79rem;
    }

    .site-header.is-scrolled .brand-logo {
        height: 2.85rem;
    }
}

@media (max-width: 760px) {
    .site-header {
        top: 0;
        padding-top: 0.85rem;
    }

    .header-inner {
        position: relative;
        flex-direction: row;
        justify-content: space-between;
        gap: 0.9rem;
        border-radius: 999px;
        padding: 0.62rem 0.72rem 0.62rem 1rem;
        border-color: rgba(255, 255, 255, 0.72);
        background: rgba(240, 240, 240, 0.48);
        backdrop-filter: blur(18px) saturate(135%);
        -webkit-backdrop-filter: blur(18px) saturate(135%);
        box-shadow:
            0 1.2rem 2rem rgba(0, 0, 0, 0.07),
            0 0.1rem 0.3rem rgba(11, 32, 103, 0.1),
            inset 0 1px 0 rgba(255, 255, 255, 0.92);
    }

    .site-header:not(.is-scrolled) .header-inner {
        justify-content: space-between;
        border-color: transparent;
        background: transparent;
        box-shadow: none;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    .site-header.is-scrolled .header-inner {
        padding: 0.62rem 0.72rem 0.62rem 1rem;
    }

    .brand-logo {
        height: 6.62rem;
        margin-left: 0;
    }

    .site-header.is-scrolled .brand-logo {
        height: 2.75rem;
    }

    .nav-toggle {
        display: inline-flex;
    }

    .site-header:not(.is-scrolled) .nav-toggle {
        position: absolute;
        top: 50%;
        right: 0.72rem;
        transform: translateY(-50%);
    }

    .site-header .site-nav,
    .site-header:not(.is-scrolled) .site-nav,
    .site-header.is-scrolled .site-nav {
        position: absolute;
        top: calc(100% + 0.55rem);
        left: 0;
        right: 0;
        z-index: -1;
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 0.2rem;
        padding: 0.65rem;
        border: 1px solid rgba(255, 255, 255, 0.72);
        border-radius: 1.35rem;
        background: rgba(240, 240, 240, 0.95);
        box-shadow:
            0 1.2rem 2rem rgba(0, 0, 0, 0.08),
            0 0.1rem 0.3rem rgba(11, 32, 103, 0.1),
            inset 0 1px 0 rgba(255, 255, 255, 0.92);
        backdrop-filter: blur(18px) saturate(135%);
        -webkit-backdrop-filter: blur(18px) saturate(135%);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(-0.5rem) scale(0.98);
        transition:
            opacity 0.24s ease,
            visibility 0.24s ease,
            transform 0.24s ease;
    }

    .site-header.is-nav-open .site-nav {
        z-index: 1;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0) scale(1);
    }

    .site-nav a {
        width: 100%;
        padding: 0.78rem 1rem;
        font-size: 1.62rem;
        text-align: left;
        margin-right: 0;
    }
}

@media (max-width: 420px) {
    .site-header {
        padding-top: 0.55rem;
    }

    .header-inner,
    .site-header.is-scrolled .header-inner {
        width: calc(100% - 1rem);
        padding: 0.56rem 0.6rem 0.56rem 0.85rem;
    }

    .brand-logo {
        height: 5.79rem;
    }

    .site-header.is-scrolled .brand-logo {
        height: 2.45rem;
    }

    .nav-toggle {
        width: 2.8rem;
        height: 2.8rem;
    }

    .site-nav a {
        padding: 0.72rem 0.85rem;
        font-size: 1.53rem;
    }
}