/* ==========================================================================
   SECTION: NAVBAR
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 100;
    opacity: 0;
    transition: opacity 3s ease-out;

    /* CSS variable for scroll-based opacity (controlled by JS) */
    --navbar-bg-opacity: 0;
}

.navbar.visible {
    opacity: 1;
}

/* Backdrop with blur and gradient fade */
.navbar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 180%;
    background-color: var(--color-dark-green);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: var(--navbar-bg-opacity);
    pointer-events: none;
    z-index: -1;

    /* Simple two-stop fade: solid behind text, gentle fade below */
    mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
}

.navbar__container {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 32px;
    padding: 12px 47px;
    opacity: 0.9;
    width: 100%;
    z-index: 101;
}

.navbar__links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 32px;
}

.navbar__logo {
    flex-shrink: 0;
    width: 59px;
    height: 59px;
}

.navbar__logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.navbar__link {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-regular);
    font-size: 24px;
    line-height: normal;
    color: var(--color-text-light-90);
    text-align: center;
    text-decoration: none;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    transition: opacity 0.2s ease;
}

.navbar__link:hover {
    opacity: 0.7;
}

/* Burger menu button - hidden on desktop */
.navbar__burger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    pointer-events: auto;
    z-index: 200;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

.navbar__burger:focus,
.navbar__burger:active {
    outline: none;
    background: transparent;
}

.navbar__burger:focus-visible {
    outline: 2px solid var(--color-orange);
    outline-offset: 4px;
}

.navbar__burger-line {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--color-text-light-90);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* ==========================================================================
   BURGER MODE (activated via JS when navbar items don't fit in one row)
   ========================================================================== */

/* Hide the backdrop gradient in burger mode */
.navbar--burger-mode::before {
    display: none;
}

.navbar--burger-mode .navbar__container {
    justify-content: space-between;
    padding: 12px 24px;
    flex-wrap: nowrap;
}

/* Dark green shadow on logo for readability */
.navbar--burger-mode .navbar__logo img {
    filter: drop-shadow(0 0 8px var(--color-dark-green))
            drop-shadow(0 0 16px var(--color-dark-green));
    transition: filter 0.3s ease;
}

/* Remove shadow when menu is open */
.navbar--burger-mode.navbar--menu-open .navbar__logo img {
    filter: none;
}

/* Keep logo above the menu background */
.navbar--burger-mode .navbar__logo {
    position: relative;
    z-index: 100;
}

/* Dark green shadow on burger lines for readability */
.navbar--burger-mode .navbar__burger-line {
    box-shadow: 0 0 8px var(--color-dark-green),
                0 0 16px var(--color-dark-green);
    transition: transform 0.3s ease, opacity 0.3s ease, box-shadow 0.3s ease;
}

/* Remove shadow when menu is open */
.navbar--burger-mode.navbar--menu-open .navbar__burger-line {
    box-shadow: none;
}

/* Show burger button */
.navbar--burger-mode .navbar__burger {
    display: flex;
}

/* Fullscreen menu overlay */
.navbar--burger-mode .navbar__links {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    gap: 12px;
    padding-right: 24px;
    background: transparent;
    pointer-events: none;
    z-index: 99;
}

/* Menu background - dark green overlay */
.navbar--burger-mode .navbar__links::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(14, 18, 10, 0.66); /* --color-dark-green at 66% */
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.navbar--burger-mode .navbar__link {
    padding: 8px 0;
    text-align: right;
    font-size: 28px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    pointer-events: none;
}

/* Downloads CTA - orange color */
.navbar--burger-mode .navbar__link[href="#downloads"] {
    color: var(--color-orange);
}


/* ==================== MENU OPEN STATE ==================== */

.navbar--burger-mode.navbar--menu-open .navbar__links {
    pointer-events: auto;
}

/* Background fades in */
.navbar--burger-mode.navbar--menu-open .navbar__links::before {
    opacity: 1;
}

/* Links fade in with stagger */
.navbar--burger-mode.navbar--menu-open .navbar__link {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s;
}

.navbar--burger-mode.navbar--menu-open .navbar__link:nth-child(1) { transition-delay: 0.25s; }
.navbar--burger-mode.navbar--menu-open .navbar__link:nth-child(2) { transition-delay: 0.32s; }
.navbar--burger-mode.navbar--menu-open .navbar__link:nth-child(3) { transition-delay: 0.39s; }
.navbar--burger-mode.navbar--menu-open .navbar__link:nth-child(4) { transition-delay: 0.46s; }
.navbar--burger-mode.navbar--menu-open .navbar__link:nth-child(5) { transition-delay: 0.53s; }
.navbar--burger-mode.navbar--menu-open .navbar__link:nth-child(6) { transition-delay: 0.60s; }

/* Burger animates to X when menu is open */
.navbar--burger-mode.navbar--menu-open .navbar__burger-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.navbar--burger-mode.navbar--menu-open .navbar__burger-line:nth-child(2) {
    opacity: 0;
}

.navbar--burger-mode.navbar--menu-open .navbar__burger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}