/* ==========================================================================
   NAV: Mega-menu ("manifest board") reveal system
   Desktop: hover top-level nav item -> panel drops from header
   Mobile:  hamburger -> full-screen accordion drawer
   ========================================================================== */

header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(14, 23, 38, 0.92);
    backdrop-filter: blur(12px);
    padding: 1.2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    color: var(--text-light);
    font-weight: 400;
    letter-spacing: -0.5px;
}

/* --- Top-level nav --- */
.nav-links {
    display: flex;
    gap: 0.5rem;
    list-style: none;
}

.nav-item {
    position: relative;
}

.nav-item > button.nav-trigger {
    background: none;
    border: none;
    font-family: var(--font-sans);
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.6rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    border-radius: 4px;
    transition: background 0.2s;
}

.nav-item > button.nav-trigger:hover,
.nav-item.panel-open > button.nav-trigger {
    background: rgba(255, 255, 255, 0.08);
}

.nav-item > button.nav-trigger .caret {
    width: 8px;
    height: 8px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.2s;
    margin-top: -3px;
}

.nav-item.panel-open > button.nav-trigger .caret {
    transform: rotate(-135deg);
    margin-top: 3px;
}

.nav-item > a.nav-trigger {
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.6rem 1rem;
    display: inline-block;
}

/* --- Mega panel --- */
.nav-panel {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--navy-creamy-dark);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background-image:
        linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
    background-size: 32px 32px;
    padding: 2.5rem 5%;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
    z-index: 999;
}

.nav-item.panel-open .nav-panel {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-panel-grid {
    max-width: 1300px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0.5rem 2.5rem;
}

.nav-panel-link {
    display: flex;
    gap: 1rem;
    padding: 0.9rem 0.5rem;
    border-radius: 6px;
    transition: background 0.15s;
    align-items: flex-start;
}

.nav-panel-link:hover {
    background: rgba(255, 255, 255, 0.05);
}

.nav-panel-tag {
    font-family: 'Courier New', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.5px;
    color: var(--blue-accent);
    border: 1px solid rgba(37, 99, 235, 0.4);
    border-radius: 3px;
    padding: 0.15rem 0.4rem;
    white-space: nowrap;
    margin-top: 0.15rem;
}

.nav-panel-copy h4 {
    color: var(--text-light);
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.nav-panel-copy p {
    color: #94A3B8;
    font-size: 0.85rem;
    line-height: 1.5;
}

/* --- Mobile hamburger + drawer --- */
.nav-hamburger {
    display: none;
    background: none;
    border: none;
    width: 32px;
    height: 24px;
    position: relative;
    cursor: pointer;
    z-index: 1002;
}

.nav-hamburger span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--text-light);
    transition: all 0.25s ease;
}

.nav-hamburger span:nth-child(1) { top: 0; }
.nav-hamburger span:nth-child(2) { top: 11px; }
.nav-hamburger span:nth-child(3) { top: 22px; }

.nav-hamburger.open span:nth-child(1) { top: 11px; transform: rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { top: 11px; transform: rotate(-45deg); }

.mobile-drawer {
    position: fixed;
    inset: 0;
    background: var(--navy-creamy-dark);
    z-index: 1001;
    padding: 6rem 6% 3rem;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.28s ease;
}

.mobile-drawer.open {
    transform: translateX(0);
}

.mobile-accordion-item {
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.mobile-accordion-trigger {
    width: 100%;
    background: none;
    border: none;
    color: var(--text-light);
    font-family: var(--font-sans);
    font-size: 1.15rem;
    font-weight: 500;
    padding: 1.2rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.mobile-accordion-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
}

.mobile-accordion-item.open .mobile-accordion-panel {
    max-height: 600px;
}

.mobile-accordion-panel a {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem 0;
    color: #CBD5E1;
    font-size: 0.95rem;
}

.mobile-accordion-panel .nav-panel-tag {
    margin-top: 0.1rem;
}

.mobile-simple-link {
    display: block;
    padding: 1.2rem 0;
    color: var(--text-light);
    font-size: 1.15rem;
    font-weight: 500;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

@media (max-width: 900px) {
    .nav-links { display: none; }
    .nav-hamburger { display: block; }
}