/* ==================================================
   SITE HEADER
================================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
}

.site-header__inner {
    position: relative;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    min-height: 80px;
    padding-block: 0.75rem;
    padding-inline: clamp(1rem, 3vw, 2rem);
    background: rgba(4, 11, 27, 0.78);
    border-bottom: 1px solid rgba(37, 99, 235, 0.25);
    border-radius: 0 0 0.75rem 0.75rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    min-width: 0;
    flex-shrink: 0;
    font-size: 1.2rem;
    font-weight: 700;
}

.brand__logo {
    display: inline-block;
    flex-shrink: 0;
    color: transparent;
    background: linear-gradient(135deg, var(--color-blue), var(--color-purple));
    background-clip: text;
    -webkit-background-clip: text;
    font-size: 1.75rem;
    font-weight: 800;
    line-height: 1;
}

.brand__name {
    overflow: hidden;
    color: var(--color-text);
    white-space: nowrap;
    text-overflow: ellipsis;
    transition: color 0.25s ease;
}

.brand__name:hover {
    color: var(--color-primary);
}

.site-header__panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(1rem, 3vw, 2.5rem);
    min-width: 0;
}

.site-nav {
    display: flex;
    justify-content: center;
    min-width: 0;
}

.site-nav__list {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: clamp(1rem, 2.2vw, 2rem);
    margin: 0;
    padding: 0;
}

.site-nav__item {
    position: relative;
}

.site-nav__link {
    position: relative;
    display: inline-block;
    padding: 0.5rem 0.2rem;
    color: var(--color-text);
    font-size: 0.9rem;
    font-weight: 500;
    line-height: 1.2;
    white-space: nowrap;
    transition: color 0.25s ease;
}

.site-nav__link::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    margin-inline: auto;
    background: linear-gradient(90deg, var(--color-blue), var(--color-purple));
    transition: width 0.25s ease;
}

.site-nav__link:hover,
.site-nav__link--active {
    color: var(--color-primary);
}

.site-nav__link:hover::after,
.site-nav__link--active::after {
    width: 100%;
}

.site-header__action {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-shrink: 0;
}

.site-header__action .button {
    white-space: nowrap;
}

.site-header__menu {
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 0.3rem;
    width: 2.75rem;
    height: 2.75rem;
    margin-left: auto;
    padding: 0;
    border: 1px solid rgba(148, 163, 184, 0.18);
    border-radius: 0.65rem;
    background: rgba(7, 16, 35, 0.55);
    color: var(--color-text);
    cursor: pointer;
}

.site-header__menu span {
    display: block;
    width: 1.2rem;
    height: 2px;
    background: currentColor;
    border-radius: 999px;
    transition: transform 0.25s ease, opacity 0.2s ease;
}

.site-header__menu[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(0.4rem) rotate(45deg);
}

.site-header__menu[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.site-header__menu[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-0.4rem) rotate(-45deg);
}

@media (max-width: 1100px) {
    .site-header__inner {
        min-height: 74px;
    }

    .site-header__panel {
        gap: 1.25rem;
    }

    .site-nav__list {
        gap: 1.15rem;
    }

    .site-nav__link {
        font-size: 0.84rem;
    }
}

/* ==================================================
   MOBILE NAVIGATION
================================================== */

@media (max-width: 860px) {
    .site-header__inner {
        grid-template-columns: minmax(0, 1fr) auto;
        min-height: 68px;
        padding-block: 0.65rem;
        overflow: visible;
    }

    .site-header__menu {
        display: flex;
    }

    .site-header__panel {
        position: absolute;
        top: calc(100% + 0.5rem);
        right: 0;
        left: 0;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        padding: 0 0.75rem;
        background: rgba(4, 11, 27, 0.97);
        border: 1px solid transparent;
        border-radius: 0.8rem;
        box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
        opacity: 0;
        pointer-events: none;
        transform: translateY(-0.5rem);
        transition: max-height 0.3s ease, opacity 0.2s ease, transform 0.3s ease, padding 0.3s ease, border-color 0.3s ease;
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
    }

    .site-header__panel.is-open {
        max-height: 30rem;
        padding-block: 0.75rem;
        border-color: rgba(148, 163, 184, 0.16);
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }

    .site-nav {
        display: block;
        width: 100%;
    }

    .site-nav__list {
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        width: 100%;
    }

    .site-nav__item {
        width: 100%;
    }

    .site-nav__link {
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 2.9rem;
        width: 100%;
        padding: 0.75rem 1rem;
        border-radius: 0.55rem;
        font-size: 0.95rem;
    }

    .site-nav__link:hover,
    .site-nav__link--active {
        background: rgba(82, 111, 245, 0.09);
    }

    .site-nav__link::after {
        display: none;
    }

    .site-header__action {
        justify-content: center;
        width: 100%;
        margin-top: 0.65rem;
        padding-top: 0.75rem;
        border-top: 1px solid rgba(148, 163, 184, 0.1);
    }

    .site-header__action .button {
        width: min(100%, 15rem);
    }

    body.menu-open {
        overflow: hidden;
    }
}

@media (max-width: 480px) {
    .site-header__inner {
        min-height: 62px;
        border-radius: 0 0 0.6rem 0.6rem;
    }

    .brand {
        gap: 0.45rem;
        font-size: 1rem;
    }

    .brand__logo {
        font-size: 1.5rem;
    }

    .brand__name {
        font-size: 0.95rem;
    }

    .site-header__menu {
        width: 2.5rem;
        height: 2.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-header__panel,
    .site-header__menu span,
    .site-nav__link,
    .brand__name {
        transition: none;
    }
}