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

.site-header {
    position: fixed;

    top: 0;
    left: 0;

    z-index: 1000;

    width: 100%;

    background: transparent;

    border-bottom: 1px solid transparent;

    transition:
        background-color var(--transition-base),
        backdrop-filter var(--transition-base),
        -webkit-backdrop-filter var(--transition-base),
        border-color var(--transition-base),
        box-shadow var(--transition-base);
}

/* ---------------------------------------------------------
   Header — Scrolled
   --------------------------------------------------------- */

.site-header.is-scrolled {
    background: rgba(5, 4, 8, 0.82);

    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);

    border-bottom: 1px solid rgba(139, 92, 246, 0.10);

    box-shadow:
        0 10px 40px rgba(0, 0, 0, 0.25);
}

/* ---------------------------------------------------------
   Header Inner
   --------------------------------------------------------- */

.site-header__inner {
    min-height: 96px;

    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ---------------------------------------------------------
   Logo
   --------------------------------------------------------- */

.site-header__logo {
    position: relative;

    z-index: 1002;

    display: flex;
    align-items: center;

    flex: 0 0 auto;
}

.site-header__logo a {
    display: flex;
    align-items: center;
}

.site-header__logo img {
    display: block;

    width: auto;
    max-width: 170px;
    max-height: 54px;

    object-fit: contain;
}

.site-header__logo-placeholder {
    display: inline-flex;
    align-items: center;

    color: #F5F3FF !important;

    font-family: var(--font-mono);

    font-size: 12px;
    font-weight: 600;

    letter-spacing: 0.12em;

    transition:
        color var(--transition-fast),
        opacity var(--transition-fast);
}

.site-header__logo-placeholder:hover {
    color: #C084FC !important;
}

/* ---------------------------------------------------------
   Navigation
   --------------------------------------------------------- */

.site-navigation {
    display: flex;
    align-items: center;

    gap: 34px;
}

.site-navigation a {
    position: relative;

    display: inline-flex;
    align-items: center;

    padding: 12px 0;

    color: #F5F3FF !important;

    font-size: 14px;
    font-weight: 500;

    line-height: 1;
    letter-spacing: 0.01em;

    white-space: nowrap;

    transition:
        color var(--transition-fast),
        opacity var(--transition-fast);
}

.site-navigation a::after {
    content: "";

    position: absolute;

    left: 0;
    bottom: 2px;

    width: 0;
    height: 1px;

    background: var(--color-primary);

    box-shadow:
        0 0 10px rgba(139, 92, 246, 0.5);

    transition:
        width var(--transition-base);
}

.site-navigation a:hover,
.site-navigation a:focus-visible,
.site-navigation a.is-active {
    color: #C084FC !important;
}

.site-navigation a:hover::after,
.site-navigation a:focus-visible::after,
.site-navigation a.is-active::after {
    width: 100%;
}

/* ---------------------------------------------------------
   Menu Toggle
   --------------------------------------------------------- */

.menu-toggle {
    position: relative;

    z-index: 1002;

    display: none;

    width: 44px;
    height: 44px;

    padding: 0;

    align-items: center;
    justify-content: center;

    flex-direction: column;

    gap: 5px;

    border: 0;

    background: transparent;

    color: #F5F3FF;
}

.menu-toggle span:not(.screen-reader-text) {
    display: block;

    width: 24px;
    height: 1px;

    background: #F5F3FF;

    transform-origin: center;

    transition:
        transform var(--transition-base),
        opacity var(--transition-base),
        background-color var(--transition-fast);
}

.menu-toggle:hover span:not(.screen-reader-text) {
    background: var(--color-primary-soft);
}

/* ---------------------------------------------------------
   Hamburger → X
   --------------------------------------------------------- */

.menu-toggle.is-active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.menu-toggle.is-active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.is-active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* ---------------------------------------------------------
   Tablet
   --------------------------------------------------------- */

@media (max-width: 1100px) {

    .site-navigation {
        gap: 24px;
    }

    .site-navigation a {
        font-size: 13px;
    }

}

/* ---------------------------------------------------------
   Mobile
   --------------------------------------------------------- */

@media (max-width: 900px) {

    .site-header__inner {
        min-height: var(--header-height);
    }

    .site-navigation {
        position: fixed;

        inset: 0;

        z-index: 1001;

        width: 100%;
        height: 100svh;

        padding:
            calc(var(--header-height) + 60px)
            var(--container-padding)
            60px;

        display: flex;

        flex-direction: column;
        align-items: flex-start;
        justify-content: center;

        gap: 0;

        background:
            radial-gradient(
                circle at 80% 20%,
                rgba(139, 92, 246, 0.10),
                transparent 30%
            ),
            #050408;

        opacity: 0;
        visibility: hidden;

        pointer-events: none;

        transform: translateY(-12px);

        transition:
            opacity var(--transition-base),
            visibility var(--transition-base),
            transform var(--transition-base);
    }

    .site-navigation.is-open {
        opacity: 1;

        visibility: visible;

        pointer-events: auto;

        transform: translateY(0);
    }

    .site-navigation a {
        width: 100%;

        padding: 16px 0;

        color: #F5F3FF !important;

        font-size: clamp(25px, 7vw, 38px);
        font-weight: 500;

        line-height: 1.1;

        letter-spacing: -0.02em;

        opacity: 0;

        transform: translateY(20px);

        transition:
            color var(--transition-fast),
            opacity 500ms ease,
            transform 500ms cubic-bezier(
                0.22,
                1,
                0.36,
                1
            );
    }

    .site-navigation.is-open a {
        opacity: 1;

        transform: translateY(0);
    }

    .site-navigation.is-open a:nth-child(1) {
        transition-delay: 50ms;
    }

    .site-navigation.is-open a:nth-child(2) {
        transition-delay: 100ms;
    }

    .site-navigation.is-open a:nth-child(3) {
        transition-delay: 150ms;
    }

    .site-navigation.is-open a:nth-child(4) {
        transition-delay: 200ms;
    }

    .site-navigation.is-open a:nth-child(5) {
        transition-delay: 250ms;
    }

    .site-navigation.is-open a:nth-child(6) {
        transition-delay: 300ms;
    }

    .site-navigation.is-open a:nth-child(7) {
        transition-delay: 350ms;
    }

    .site-navigation a::after {
        bottom: 8px;

        height: 2px;
    }

    .menu-toggle {
        display: flex;
    }

}

/* ---------------------------------------------------------
   Small Mobile
   --------------------------------------------------------- */

@media (max-width: 600px) {

    .site-header__logo img {
        max-width: 140px;
        max-height: 46px;
    }

    .site-navigation {
        padding-inline: 20px;
    }

    .site-navigation a {
        padding: 14px 0;

        font-size: clamp(24px, 8vw, 34px);
    }

}