/* ==========================================================================
   THE BOLD WAY - Navigation System
   Desktop mega dropdowns + mobile accordion
   ========================================================================== */

/* ===== NAV BASE ===== */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
    background: rgba(7,9,15,0.92);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}
.nav-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    z-index: 1001;
}
.nav-logo img { height: 40px; width: auto; }


/* ===== DESKTOP NAV LINKS ===== */
.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
    align-items: center;
}
.nav-links > li {
    position: relative;
}
.nav-links > li > a {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-tertiary);
    letter-spacing: 0.3px;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 20px 0;
}
.nav-links > li > a:hover,
.nav-links > li.active > a {
    color: var(--text-primary);
}
/* Dropdown arrow */
.nav-arrow {
    width: 10px;
    height: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
}
.nav-arrow svg {
    width: 8px;
    height: 8px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
}
.nav-links > li:hover .nav-arrow { transform: rotate(180deg); }


/* ===== NAV RIGHT ===== */
.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}
.nav-right > a:first-child {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-tertiary);
}
.nav-cta {
    padding: 9px 22px;
    font-size: 11px;
    letter-spacing: 1.2px;
}


/* ===== MEGA DROPDOWN (The OS, Industries) ===== */
.mega-dropdown {
    position: fixed;
    top: 64px;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    min-width: 640px;
    max-width: calc(100vw - 48px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.25s,
                transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
    z-index: 1000;
}
.nav-links > li:hover .mega-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.mega-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 36px;
}
.mega-col-title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}
.mega-link {
    display: block;
    padding: 8px 12px;
    border-radius: 6px;
    margin: 0 -12px;
    transition: background 0.15s;
}
.mega-link:hover {
    background: rgba(255,255,255,0.04);
}
.mega-link-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}
.mega-link-desc {
    font-size: 12px;
    color: var(--text-tertiary);
    line-height: 1.4;
}
.mega-link:hover .mega-link-title { color: var(--red-bright); }


/* ===== SIMPLE DROPDOWN (Methodology, About) ===== */
.simple-dropdown {
    position: absolute;
    top: 64px;
    left: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 8px;
    min-width: 240px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.25s,
                transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
    z-index: 1000;
}
.nav-links > li:hover .simple-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.simple-dropdown a {
    display: block;
    padding: 10px 14px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 6px;
    transition: background 0.15s, color 0.15s;
}
.simple-dropdown a:hover {
    background: rgba(255,255,255,0.04);
    color: var(--text-primary);
}


/* ===== THE OS MEGA DROPDOWN (4-column) ===== */
.mega-dropdown.mega-os {
    min-width: 780px;
}
.mega-os .mega-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* ===== INDUSTRIES MEGA DROPDOWN (wider) ===== */
.mega-dropdown.mega-industries {
    min-width: 780px;
}
.mega-industries .mega-grid {
    grid-template-columns: 1fr 1fr;
    gap: 4px 36px;
}
.mega-industries .mega-link {
    padding: 6px 12px;
}
.mega-industries .mega-link-desc {
    font-style: italic;
    font-size: 12px;
}


/* ===== MOBILE HAMBURGER ===== */
.nav-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    cursor: pointer;
    z-index: 1001;
    background: none;
    border: none;
    padding: 0;
}
.nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-secondary);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    margin: 3px 0;
}
.nav-hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}
.nav-hamburger.active span:nth-child(2) {
    opacity: 0;
}
.nav-hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
}


/* ===== MOBILE NAV OVERLAY ===== */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 998;
    padding: 80px 24px 24px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}
.mobile-nav.open {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-section {
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
}
.mobile-nav-section:last-child { border-bottom: none; }

.mobile-nav-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 8px 0;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    color: var(--text-primary);
}
.mobile-nav-toggle-label {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}
.mobile-nav-toggle-arrow {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s;
}
.mobile-nav-toggle-arrow svg {
    width: 12px;
    height: 12px;
    fill: none;
    stroke: var(--text-tertiary);
    stroke-width: 2;
    stroke-linecap: round;
}
.mobile-nav-section.open .mobile-nav-toggle-arrow {
    transform: rotate(180deg);
}

/* Direct link items (no accordion) */
.mobile-nav-link {
    display: block;
    padding: 12px 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border);
}
.mobile-nav-link:last-of-type { border-bottom: none; }

.mobile-nav-sub {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.mobile-nav-section.open .mobile-nav-sub {
    max-height: 800px;
}
.mobile-nav-sub-group {
    padding: 8px 0 4px;
}
.mobile-nav-sub-title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-dim);
    padding: 8px 0 4px;
}
.mobile-nav-sub a {
    display: block;
    padding: 10px 0 10px 12px;
    font-size: 15px;
    font-weight: 400;
    color: var(--text-secondary);
    border-left: 2px solid var(--border);
    transition: color 0.15s, border-color 0.15s;
}
.mobile-nav-sub a:hover {
    color: var(--text-primary);
    border-left-color: var(--red-bright);
}

.mobile-nav-cta {
    padding: 20px 0;
    text-align: center;
}
.mobile-nav-cta .btn {
    width: 100%;
}
.mobile-nav-login {
    text-align: center;
    padding: 8px 0;
}
.mobile-nav-login a {
    font-size: 14px;
    color: var(--text-tertiary);
}


/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .nav-links { gap: 20px; }
    .mega-dropdown { min-width: 560px; padding: 24px; }
    .mega-dropdown.mega-industries { min-width: 640px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-right > a:first-child { display: none; }
    .nav-hamburger { display: flex; }
    .mobile-nav { display: block; }
    .nav-logo img { height: 34px; }
    .nav-cta { padding: 8px 18px; font-size: 10px; }
}