header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 99999;
    padding: 1.5rem 0 0.8rem 0;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(2.5px);
    -webkit-backdrop-filter: blur(2.5px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    pointer-events: none;
    transform: translateY(-100%); /* Hidden initially */
}

/* Override animation if we want JS control via hero-active 
   Actually, if I use animation, it runs immediately.
   On Home Page, we want to WAIT.
   So Home Page header shouldn't animate immediately.
   
   Solution:
   1. Default header: `transform: translateY(0);` (Visible)
   2. .home-page header: `transform: translateY(-100%);` (Hidden, waits for loader)
   3. body.hero-active header: `transform: translateY(0);` (Reveals)
   
   BUT user said "make it animated in all pages".
   So on inner pages, they want it to slide down too?
   If so, simple CSS animation `slideDown` on load is best for inner pages.
   
   Let's check `about.html`.
*/

body.hero-active header {
    transform: translateY(0);
}

/* Interior Pages Header - Semi-transparent background by default */
body:not(.home-page) header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 0.8rem 0;
    
    /* Ensure visibility on inner pages via animation, independent of hero-active */
    animation: slideDownHeader 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    animation-delay: 0.1s;
}

@keyframes slideDownHeader {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

header > * {
    pointer-events: auto;
}

/* Home Hero Logo - No Filter */
.home-page header:not(.scrolled) .logo img,
.home-page header:not(.scrolled) .logo-right img {
    filter: none;
    opacity: 1;
}

header.scrolled {
    background: rgba(255, 255, 255, 0.6); 
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 0.8rem 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.logo {
    transition: var(--transit-smooth);
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

header.scrolled .logo img,
header.scrolled .logo-right img {
    transform: scale(0.9);
}

.logo img,
.logo-right img {
    transition: transform 0.4s ease;
}

/* Nav Links */
.nav-link {
    color: var(--clr-text-main);
    opacity: 0.7;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.2rem 0;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    transition: all 0.3s ease;
    position: relative;
    white-space: nowrap;
    text-decoration: none !important;
}

/* Navigation Over Hero (Home Page only) - DESKTOP */
@media (min-width: 1200px) {
    .home-page header:not(.scrolled) .nav-link {
        color: var(--clr-white);
        opacity: 1;
    }

    .home-page header:not(.scrolled) .hamburger-line {
        background-color: var(--clr-white);
    }
}

/* Hamburger white in hero on mobile (before scroll) */
.home-page header:not(.scrolled) .mobile-toggle .hamburger-line {
    background-color: #ffffff;
}

/* Hamburger black when menu is open */
.mobile-toggle.mobile-active .hamburger-line {
    background-color: var(--clr-text-main) !important;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.8rem; /* Aligned exactly with the bottom of the header */
    left: 0;
    width: 0;
    height: 3px;
    background: var(--clr-accent);
    transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

header.scrolled .nav-link::after {
    bottom: -0.5rem;
}

.nav-link:hover {
    opacity: 1;
    color: var(--clr-accent);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.active {
    opacity: 1;
    color: var(--clr-accent) !important;
    font-weight: 700;
}

/* Active nav link white in hero section (before scroll) - DESKTOP ONLY */
@media (min-width: 1200px) {
    .home-page header:not(.scrolled) .nav-link.active {
        color: #ffffff !important;
    }

    .home-page header:not(.scrolled) .nav-link.active::after {
        background: #ffffff;
    }

    /* When scrolled, revert to green */
    .home-page header.scrolled .nav-link.active {
        color: var(--clr-accent) !important;
    }

    .home-page header.scrolled .nav-link.active::after {
        background: var(--clr-accent);
    }
}

/* Authentication Button */
.btn-nav-auth {
    padding: 0.8rem 2rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    background-color: var(--clr-accent);
    color: white !important;
    border-radius: 100px;
    box-shadow: 0 4px 15px rgba(0, 109, 91, 0.15);
    transition: var(--transit-smooth);
}

.btn-nav-auth:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 109, 91, 0.25);
    background-color: var(--clr-accent-hover);
}

/* --- Animated Hamburger --- */
.mobile-toggle {
    display: none;
    border: none;
    background: none;
    width: 30px;
    height: 20px;
    position: relative;
    cursor: pointer;
    z-index: 1100;
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--clr-text-main);
    position: absolute;
    left: 0;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.line-1 { top: 6px; }
.line-2 { bottom: 6px; }

.mobile-active .line-1 {
    transform: translateY(3px) rotate(45deg);
}
.mobile-active .line-2 {
    transform: translateY(-3px) rotate(-45deg);
}

/* Navigation Lists Consistency */
nav ul, 
nav li,
.nav-desktop ul, 
.nav-desktop li {
    list-style: none !important;
    padding: 0;
    margin: 0;
}

.nav-desktop {
    display: flex !important;
    align-items: flex-end;
    gap: 3rem; /* More breathing room */
    margin-left: auto;
}

.nav-desktop ul {
    display: flex !important;
    align-items: flex-end;
    gap: 2.2rem !important; 
    margin: 0;
    padding: 0;
    flex-wrap: nowrap;
}

/* --- Mobile Menu Overlay --- */
@media (max-width: 1199px) {
    .mobile-toggle {
        display: block;
        height: 20px;
    }

    .nav-desktop {
        position: fixed;
        top: 0;
        right: 0;
        width: 100%; 
        height: 100vh;
        background: #ffffff;
        padding: 6rem 2.5rem 4rem; 
        transform: translateX(100%);
        transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 1050;
        display: flex !important; /* Always flex but hidden by right -100% */
        flex-direction: column;
        align-items: center;
        overflow-y: auto; /* Scrollable if links overflow */
    }

    .nav-desktop.mobile-active {
        transform: translateX(0);
        box-shadow: -10px 0 50px rgba(0,0,0,0.05);
    }

    .nav-desktop ul {
        flex-direction: column;
        gap: 1.8rem !important;
        align-items: center !important;
        text-align: center;
        width: 100%;
        margin-bottom: 2rem;
    }

    .mobile-menu-logos {
        width: 100%;
        opacity: 0;
        transition: opacity 0.5s ease 0.3s; /* Delay for smooth entrance */
    }

    .nav-link {
        font-size: 1rem;
        letter-spacing: 0.1em;
        padding: 0.5rem;
        opacity: 0.8;
    }

    /* Override home-page scroll rules for mobile menu */
    .home-page .nav-desktop .nav-link {
        color: var(--clr-text-main) !important;
        opacity: 0.8;
    }

    .home-page .nav-desktop .nav-link.active {
        color: var(--clr-accent) !important;
        opacity: 1;
    }

    .home-page .nav-desktop .nav-link.active::after {
        background: var(--clr-accent) !important;
    }

    .home-page .nav-desktop .hamburger-line {
        background-color: var(--clr-text-main) !important;
    }

    /* Mobile nav link active state */
    .nav-desktop .nav-link {
        outline: none !important;
        -webkit-tap-highlight-color: transparent;
    }

    .nav-desktop .nav-link:focus,
    .nav-desktop .nav-link:active {
        outline: none !important;
        box-shadow: none !important;
    }

    .nav-desktop .nav-link.active {
        color: var(--clr-accent) !important;
        font-weight: 700;
    }

    .btn-nav-auth {
        margin-top: 1rem;
        width: 100%;
        max-width: 280px;
        padding: 1.2rem;
        font-size: 0.8rem;
    }
}

body.menu-open {
    overflow: hidden !important;
}

/* Medium Desktop Adjustment */
@media (min-width: 1200px) and (max-width: 1399px) {
    .nav-desktop ul {
        gap: 1rem !important;
    }
    .nav-link {
        font-size: 0.75rem;
        letter-spacing: 0.05em;
    }
    .btn-nav-auth {
        padding: 0.6rem 1.2rem;
        font-size: 0.65rem;
    }
}

/* Hide Navigation when Footer is visible */
header.nav-hidden {
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}