/**
 * هدر / نوار ناوبری
 */

.site-header {
    position: fixed;
    top: 0;
    inset-inline: 0;
    z-index: var(--z-header);
    height: var(--header-h);
    display: flex;
    align-items: center;
    transition: height var(--dur-base) var(--ease-out),
        background var(--dur-base), border-color var(--dur-base);
    border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
    height: var(--header-h-scrolled);
    background: rgba(9, 9, 11, 0.78);
    backdrop-filter: blur(16px) saturate(140%);
    border-color: var(--line-1);
}

.site-header .inner {
    width: 100%;
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: var(--container-pad);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-6);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    flex-shrink: 0;
}
.brand img {
    height: 90px;
    width: auto;
    transition: height var(--dur-base);
}
.site-header.is-scrolled .brand img {
    height: 64px;
}
.brand .brand-name {
    display: none;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--sp-8);
}
.main-nav a {
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-500);
    position: relative;
    padding: 6px 0;
    transition: color var(--dur-fast);
}
.main-nav a::after {
    content: "";
    position: absolute;
    bottom: 0;
    inset-inline: 0;
    height: 2px;
    border-radius: 2px;
    background: var(--gold-500);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--dur-base) var(--ease-out);
}
.main-nav a:hover {
    color: var(--ink-100);
}
.main-nav a:hover::after,
.main-nav a.is-active::after {
    transform: scaleX(1);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    flex-shrink: 0;
}

.burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 28px;
    height: 28px;
    z-index: 10;
}
.burger span {
    height: 2px;
    width: 100%;
    background: var(--ink-100);
    border-radius: 2px;
    transition: transform var(--dur-base) var(--ease-spring),
        opacity var(--dur-fast);
}
.burger.is-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.burger.is-open span:nth-child(2) {
    opacity: 0;
}
.burger.is-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 980px) {
    .main-nav {
        display: none;
    }
    .header-actions .btn-gold-desktop {
        display: none;
    }
    .burger {
        display: flex;
    }
}

.mobile-panel {
    position: fixed;
    inset: 0;
    z-index: var(--z-dropdown);
    background: var(--bg-void);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--sp-8);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-16px);
    transition: opacity var(--dur-base) var(--ease-out),
        transform var(--dur-base) var(--ease-out), visibility 0s var(--dur-base);
}
.mobile-panel.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition-delay: 0s;
}
.mobile-panel a {
    font-size: 24px;
    font-weight: 700;
    color: var(--ink-100);
}
.mobile-panel .mp-cta {
    margin-top: var(--sp-6);
}