/* ============================================================
   HEADER / NAVBAR
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(241, 243, 243, 0.62);
    backdrop-filter: saturate(180%) blur(18px);
    -webkit-backdrop-filter: saturate(180%) blur(18px);
    border-bottom: 1px solid rgba(37, 40, 32, 0.05);
    transition:
        background 0.5s var(--ease-out),
        box-shadow 0.5s var(--ease-out),
        border-color 0.5s var(--ease-out);
}

.site-header__rail {
    position: absolute;
    inset: auto 0 0 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(88, 98, 42, 0.18) 22%,
        rgba(88, 98, 42, 0.32) 50%,
        rgba(88, 98, 42, 0.18) 78%,
        transparent 100%);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s var(--ease-out);
}

.site-header.is-scrolled {
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 14px 44px -22px rgba(37, 40, 32, 0.18);
    border-color: var(--c-line);
}

.site-header.is-scrolled .site-header__rail { opacity: 1; }

.navbar {
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s-3);
    min-height: var(--header-h);
    padding: 0.8rem var(--s-4);
}

.brand {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    transition: opacity var(--t-fast), transform var(--t-fast);
}

.brand:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

.brand__logo {
    height: 52px;
    width: auto;
    object-fit: contain;
}

.nav-panel {
    display: flex;
    align-items: center;
    gap: var(--s-3);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.1rem;
    padding: 0.35rem;
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(10px) saturate(140%);
    -webkit-backdrop-filter: blur(10px) saturate(140%);
    border-radius: 999px;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.7),
        0 6px 22px -16px rgba(37, 40, 32, 0.18);
}

.nav-menu a {
    position: relative;
    font-family: var(--ff-body);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--c-text-muted);
    padding: 0.55rem 0.95rem;
    border-radius: 999px;
    white-space: nowrap;
    transition:
        color 0.35s var(--ease-out),
        background 0.35s var(--ease-out);
}

.nav-menu a:hover,
.nav-menu a.is-active {
    color: var(--c-primary-dark);
    background: rgba(88, 98, 42, 0.09);
}

.nav-cta {
    flex-shrink: 0;
    padding: 0.72rem 1.35rem;
    box-shadow: 0 8px 24px -10px rgba(88, 98, 42, 0.5);
}

.nav-cta .icon { width: 14px; height: 14px; }

.hamburger {
    display: none;
    position: relative;
    flex-shrink: 0;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    padding: 0;
    border-radius: 50%;
    border: 1px solid var(--c-line);
    background: rgba(255, 255, 255, 0.85);
    color: var(--c-text);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 6px 18px -10px rgba(37, 40, 32, 0.18);
    z-index: 101;
    transition:
        background 0.35s var(--ease-out),
        border-color 0.35s var(--ease-out),
        transform 0.35s var(--ease-out);
}

.hamburger:hover {
    background: #fff;
    border-color: rgba(88, 98, 42, 0.32);
    transform: scale(1.04);
}

.hamburger.is-active {
    background: var(--c-primary);
    border-color: var(--c-primary);
    color: #fff;
}

.menu-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(18, 20, 14, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.45s var(--ease-out), visibility 0.45s var(--ease-out);
    z-index: 98;
    -webkit-tap-highlight-color: transparent;
}

.menu-backdrop.is-visible {
    opacity: 1;
    visibility: visible;
}

body.menu-open { overflow: hidden; }

.hamburger__open,
.hamburger__close {
    position: absolute;
    inset: 0;
    margin: auto;
    transition: opacity 0.4s var(--ease-out), transform 0.5s var(--ease-out);
}

.hamburger__close {
    opacity: 0;
    transform: rotate(-90deg) scale(0.6);
}

.hamburger.is-active .hamburger__open {
    opacity: 0;
    transform: rotate(90deg) scale(0.6);
}

.hamburger.is-active .hamburger__close {
    opacity: 1;
    transform: rotate(0) scale(1);
}

@media (max-width: 1024px) {
    .nav-panel {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: min(88vw, 400px);
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: var(--s-4);
        padding: calc(var(--header-h) + var(--s-3)) var(--s-4) var(--s-4);
        background: var(--c-bg-paper);
        box-shadow: -28px 0 64px -16px rgba(37, 40, 32, 0.28);
        transform: translate3d(105%, 0, 0);
        transition: transform 0.5s var(--ease-out);
        z-index: 99;
        overflow-y: auto;
        visibility: hidden;
    }

    .nav-panel.is-open {
        transform: translate3d(0, 0, 0);
        visibility: visible;
    }

    .nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 0;
        background: transparent;
        border: none;
        border-radius: 0;
        box-shadow: none;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    .nav-menu li {
        opacity: 0;
        transform: translate3d(20px, 0, 0);
        transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out);
    }

    .nav-panel.is-open .nav-menu li {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }

    .nav-panel.is-open .nav-menu li:nth-child(1) { transition-delay: 0.08s; }
    .nav-panel.is-open .nav-menu li:nth-child(2) { transition-delay: 0.12s; }
    .nav-panel.is-open .nav-menu li:nth-child(3) { transition-delay: 0.16s; }
    .nav-panel.is-open .nav-menu li:nth-child(4) { transition-delay: 0.2s; }
    .nav-panel.is-open .nav-menu li:nth-child(5) { transition-delay: 0.24s; }
    .nav-panel.is-open .nav-menu li:nth-child(6) { transition-delay: 0.28s; }

    .nav-menu a {
        display: block;
        padding: 1rem 0;
        font-size: 1.05rem;
        font-weight: 500;
        color: var(--c-text);
        border-radius: 0;
        border-bottom: 1px solid var(--c-line);
    }

    .nav-menu a:hover,
    .nav-menu a.is-active {
        background: transparent;
        color: var(--c-primary);
    }

    .nav-cta {
        width: 100%;
        justify-content: center;
        margin-top: auto;
        opacity: 0;
        transform: translate3d(20px, 0, 0);
        transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out);
    }

    .nav-panel.is-open .nav-cta {
        opacity: 1;
        transform: translate3d(0, 0, 0);
        transition-delay: 0.34s;
    }

    .hamburger { display: inline-flex; }
}

@media (max-width: 720px) {
    .nav-cta { width: 100%; }
}