/* =============================================================================
   SYNTROPY — NAVIGATION
   ============================================================================= */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.125rem var(--sp-6);
    transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}

/* Scrolled state — applied by JS */
.site-header.scrolled {
    background: rgba(8, 8, 8, 0.9);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 var(--border);
}

/* --- Container -------------------------------------------------------------- */
.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-8);
}

/* --- Logo ------------------------------------------------------------------- */
.nav-logo {
    flex-shrink: 0;
    line-height: 1;
}

.nav-logo img,
.nav-logo .custom-logo {
    height: 34px;
    width: auto;
    display: block;
}

.nav-logo-text {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, #fff 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* --- Links ------------------------------------------------------------------ */
.nav-links {
    display: flex;
    align-items: center;
    gap: var(--sp-1);
}

.nav-links > li > a,
.nav-dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius-md);
    transition: color var(--transition), background var(--transition);
}

.nav-links > li > a:hover,
.nav-dropdown-toggle:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.05);
}

.nav-links > li.current-menu-item > a {
    color: var(--color-text);
    font-weight: 600;
}

/* CTA button in nav */
.nav-cta {
    background: var(--color-primary) !important;
    color: #fff !important;
    border-radius: var(--radius-md) !important;
    padding: 0.5rem 1.25rem !important;
    font-weight: 600 !important;
    margin-left: var(--sp-2);
}
.nav-cta:hover {
    background: var(--color-primary-hover) !important;
}

/* --- Dropdown --------------------------------------------------------------- */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle svg {
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.nav-dropdown.open .nav-dropdown-toggle svg {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-6px);
    min-width: 160px;
    background: var(--color-bg-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--sp-2);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}

.nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-dropdown-menu li a {
    display: block;
    padding: 0.6rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius-md);
    transition: color var(--transition), background var(--transition);
}

.nav-dropdown-menu li a:hover {
    color: var(--color-text);
    background: var(--color-bg-3);
}

/* --- Hamburger ------------------------------------------------------------- */
.nav-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 8px;
    border-radius: var(--radius-sm);
    width: 38px;
    height: 38px;
    transition: background var(--transition);
}

.nav-hamburger:hover {
    background: rgba(255, 255, 255, 0.06);
}

.nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease, width 0.3s ease;
}

/* X state */
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; width: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Mobile nav ------------------------------------------------------------- */
@media (max-width: 940px) {
    .nav-hamburger { display: flex; }

    .nav-links {
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 2px;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg-2);
        border-top: 1px solid var(--color-border-dark);
        border-bottom: 1px solid var(--color-border-dark);
        padding: var(--sp-3) var(--sp-4) var(--sp-4);
    }

    .nav-links.open { display: flex; }

    .nav-links > li > a,
    .nav-dropdown-toggle {
        width: 100%;
        padding: 0.75rem 1rem;
        justify-content: flex-start;
    }

    .nav-dropdown-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        background: rgba(255, 255, 255, 0.03);
        border: none;
        border-radius: 0;
        padding: 0 0 0 var(--sp-4);
        margin-top: 2px;
    }

    .nav-cta {
        margin-left: 0 !important;
        margin-top: var(--sp-2);
        justify-content: center;
    }
}