/* =============================================================================
   site-chrome.css — the ONE shared site header.

   Single source of truth for the top header/nav on EVERY page: the templated
   site (linked from templates/base.html) AND the hand-authored Atlas (injected
   into each atlas page at build time by build_site.py:stamp_atlas_nav). Do not
   copy these rules into styles.css or atlas.css — edit them here only.

   var() uses carry fallbacks so the header renders identically regardless of
   the host page's :root (styles.css and atlas.css define these vars slightly
   differently — e.g. --max-width 1200 vs 1180; the header intentionally tracks
   each page's content width via that var so its gutters line up with the page).
   ============================================================================= */

.site-header {
    border-bottom: 1px solid var(--border-subtle, rgba(201, 168, 117, 0.2));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background: rgba(26, 35, 50, 0.9);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: var(--max-width, 1200px);
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-logo {
    width: 32px;
    height: 32px;
    max-width: 32px;
    max-height: 32px;
    border-radius: 4px;
    object-fit: contain;
}

.logo-text {
    font-family: var(--font-display, 'EB Garamond', 'Cormorant Garamond', 'Georgia', serif);
    font-size: 1.3rem;
    color: var(--warm-gold, #e8c89a);
    letter-spacing: 0.05em;
}

.main-nav {
    display: flex;
    gap: 2rem;
}

.main-nav a {
    color: var(--text-light, #e8e4dd);
    font-size: 0.95rem;
    letter-spacing: 0.03em;
    opacity: 0.8;
    transition: opacity 0.3s ease, color 0.3s ease;
    padding: 0.5rem 0;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gold, #c9a875);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.main-nav a:hover,
.main-nav a.active {
    opacity: 1;
    color: var(--warm-gold, #e8c89a);
}

.main-nav a.active::after,
.main-nav a:hover::after {
    transform: scaleX(1);
}

/* Nav dropdown group ("The Machine") */
.nav-group {
    position: relative;
    display: flex;
    align-items: center;
}

.nav-group-toggle {
    font-family: inherit;
    font-size: 0.95rem;
    letter-spacing: 0.03em;
    color: var(--text-light, #e8e4dd);
    opacity: 0.8;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem 0;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: opacity 0.3s ease, color 0.3s ease;
}

.nav-group:hover .nav-group-toggle,
.nav-group.open .nav-group-toggle,
.nav-group-toggle.active {
    opacity: 1;
    color: var(--warm-gold, #e8c89a);
}

.nav-caret {
    font-size: 0.7rem;
    line-height: 1;
    transition: transform 0.3s ease;
}

.nav-group:hover .nav-caret,
.nav-group.open .nav-caret {
    transform: rotate(180deg);
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 160px;
    background: rgba(26, 35, 50, 0.98);
    border: 1px solid var(--border-subtle, rgba(201, 168, 117, 0.2));
    border-radius: 8px;
    padding: 0.4rem;
    display: flex;
    flex-direction: column;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
    z-index: 100;
}

.nav-group:hover .nav-dropdown,
.nav-group.open .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(6px);
}

.nav-dropdown a {
    padding: 0.55rem 0.9rem;
    border-radius: 5px;
    white-space: nowrap;
    opacity: 0.85;
}

.nav-dropdown a::after {
    display: none;
}

.nav-dropdown a:hover,
.nav-dropdown a.active {
    background: rgba(255, 255, 255, 0.06);
    opacity: 1;
    color: var(--warm-gold, #e8c89a);
}

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-light, #e8e4dd);
    transition: all 0.3s ease;
}

.mobile-menu-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile: nav collapses to a hamburger panel; the dropdown becomes an accordion */
@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(26, 35, 50, 0.98);
        flex-direction: column;
        padding: 1rem;
        gap: 0;
        border-bottom: 1px solid var(--border-subtle, rgba(201, 168, 117, 0.2));
    }

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

    .main-nav a {
        padding: 1rem;
        text-align: center;
        border-bottom: 1px solid var(--border-subtle, rgba(201, 168, 117, 0.2));
    }

    .main-nav a:last-child {
        border-bottom: none;
    }

    .main-nav a::after {
        display: none;
    }

    .nav-group {
        flex-direction: column;
        align-items: stretch;
    }

    .nav-group-toggle {
        width: 100%;
        padding: 1rem;
        justify-content: center;
        border-bottom: 1px solid var(--border-subtle, rgba(201, 168, 117, 0.2));
    }

    .nav-dropdown {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        min-width: 0;
        padding: 0;
        border: none;
        border-radius: 0;
        background: rgba(0, 0, 0, 0.2);
        box-shadow: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .nav-group.open .nav-dropdown {
        transform: none;
        max-height: 200px;
    }

    .nav-dropdown a {
        text-align: center;
        padding: 0.85rem 1rem;
        border-radius: 0;
        border-bottom: 1px solid var(--border-subtle, rgba(201, 168, 117, 0.2));
    }

    .mobile-menu-toggle {
        display: flex;
    }
}

/* Very small screens: tighten the header gutter + wordmark */
@media (max-width: 480px) {
    .header-container {
        padding: 0.75rem 1rem;
    }

    .logo-text {
        font-size: 1.1rem;
    }
}