/* --- Navigation & Header --- */
.global-header {
    position: relative;
    width: 100%;
    top: 0;
    left: 0;
    z-index: var(--z-sticky);
    padding-top: 0;
    overflow: hidden;
}

@media (max-width: 768px) {
    .global-header {
        overflow: visible;
    }

    .nav-btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.6rem;
    }

    .nav-links {
        gap: 1rem;
    }


}

.main-navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    padding: 1rem 0;
}

.logo-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding: 1rem 2rem;
    margin-left: -2rem;
    z-index: var(--z-ground);
    flex-shrink: 0;
    overflow: visible;
}



@media (max-width: 768px) {

    .logo-container {
        margin-left: 0;
        padding: 1rem 3rem;
    }

    .logo {
        font-size: 1.8rem;
    }

    .logo-subtitle {
        font-size: 0.65rem;
        letter-spacing: 0.15em;
    }
}

.logo {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    font-weight: 800;
    color: #EAE6DF;
    text-decoration: none;
    letter-spacing: -0.02em;
    text-shadow: 0 0 20px var(--accent-glow);
    line-height: 1;
}

.logo-subtitle {
    font-family: var(--font-primary);
    font-size: 0.75rem;
    color: #EAE6DF;
    letter-spacing: 0.2em;
    margin-top: 0.25rem;
    text-shadow: 0 0 10px var(--accent-glow);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
    position: relative;
    z-index: var(--z-nav);
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    opacity: 0.7;
    text-decoration: none;
    font-family: var(--font-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: 0.08em;
    transition: opacity var(--transition-fast);
    position: relative;
    padding: 0.5rem 1rem;
}

.nav-btn:hover {
    opacity: 1;
}

.nav-btn.active {
    opacity: 1;
}

.nav-btn.active::after {
    content: "";
    position: absolute;
    bottom: 6px;
    left: 0;
    width: 100%;
    height: 2px;
    background: color-mix(in srgb, var(--accent-primary) 70%, transparent);
    box-shadow: 0 0 10px var(--accent-glow);
}

.footer-socials {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.25rem;
}

.footer-socials a {
    color: var(--text-secondary);
    font-size: 1.25rem;
    transition: color var(--transition-fast), transform var(--transition-fast);
    text-decoration: none;
}

.footer-socials a:hover {
    color: var(--accent-primary);
    transform: translateY(-2px);
}


/* --- Tabbed Interface System --- */
.tab-nav {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-bottom: 2rem;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    position: relative;
    padding-bottom: 2px;
    z-index: var(--z-floor);
}

.tab-nav::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2.75px;
    background: linear-gradient(to right, transparent, var(--glass-border), var(--accent-primary), var(--glass-border), transparent);
    opacity: 0.45;
    pointer-events: none;
}

.tab-btn {
    flex: 1;
    text-align: center;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-secondary);
    font-size: 1.1rem;
    text-transform: uppercase;
    padding: 0.75rem 1rem;
    cursor: pointer;
    border-bottom: none;
    transition: color var(--transition-smooth);
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transform: translateY(-4px);
}

.tab-btn.active::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 35px;
    height: 35px;
    background: var(--accent-glow);
    border: 1px solid color-mix(in srgb, var(--accent-primary) 70%, transparent);
    border-radius: 50%;
    z-index: var(--z-ground);
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--accent-primary);
}

.tab-btn.active::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 10%;
    width: 80%;
    height: 2px;
    background: linear-gradient(to right, transparent, color-mix(in srgb, var(--accent-primary) 70%, transparent), transparent);
    z-index: var(--z-floor);
    border-radius: 2px;
    transform: translateY(4px);
}

.tab-pane {
    display: none;
    position: relative;
}

.tab-pane.active {
    display: block;
}

/* @keyframes fadeIn is defined in shared-core.css */
/* --- Relocated from shared-core.css (Phase 4 Finalization) --- */
body.on-test-page .global-header,
body.on-test-page .site-footer {
    display: none;
}

body.on-test-page .global-top-announcement-bar::before,
body.on-test-page .global-top-announcement-bar .announcement-scroll-icon,
.global-header.splash-transparent .global-top-announcement-bar::before,
.global-header.splash-transparent .global-top-announcement-bar .announcement-scroll-icon {
    animation: none;
    transition: none;
}

body.on-test-page .tab-nav {
    padding-top: 0.35rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.25rem;
    overflow: visible;
}

body.on-test-page .tab-btn i,
body.on-test-page .tab-btn svg {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateY(-1px);
}

body.on-test-page .tab-btn [data-lucide="book-open"],
body.on-test-page .tab-btn .lucide-book-open {
    width: 25px;
    height: 25px;
    transform: translateY(1px);
}

body.on-test-page .tab-btn {
    padding: 0.4rem 0.5rem;
    transform: none;
    color: #EAE6DF;
}

body.on-test-page .tab-btn:hover {
    color: #EAE6DF;
}

body.on-test-page .tab-btn.active::after {
    bottom: -0.25rem;
}

@media (max-width: 1024px) {
    .logo-container {
        margin-left: 0;
        padding: 1rem 2rem;
    }

    .tab-btn {
        font-size: 0.75rem;
        padding: 0.5rem 0.6rem;
        white-space: nowrap;
        flex-shrink: 0;
        letter-spacing: 0;
        scroll-snap-align: start;
    }
}

@media (max-width: 400px) {
    .tab-btn {
        font-size: 0.6rem;
        padding: 0.4rem 0.35rem;
    }
}

@media (max-width: 360px) {
    .tab-btn {
        font-size: 0.65rem;
        padding: 0.45rem 0.45rem;
    }
}

/* Global Top Announcement Bar */
@keyframes bannerShimmer {
    0% { transform: translate3d(0, 0, 0); }
    100% { transform: translate3d(-50%, 0, 0); }
}

@keyframes scrollPulse {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.08) rotate(3deg); }
}

.global-top-announcement-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    background: transparent;
    border-bottom: 1px solid color-mix(in srgb, var(--accent-primary) 15%, transparent);
    padding: 0.3rem 1rem;
    font-family: var(--font-body);
    font-size: 0.8rem;
    color: var(--text-primary);
    text-align: center;
    transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
    cursor: pointer;
    width: 100%;
    position: relative;
    z-index: var(--z-nav);
    overflow: hidden;
}

.global-top-announcement-bar::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 100%;
    background: linear-gradient(90deg, transparent 0%, color-mix(in srgb, var(--accent-primary) 12%, transparent) 25%, color-mix(in srgb, var(--accent-primary) 22%, transparent) 50%, color-mix(in srgb, var(--accent-primary) 12%, transparent) 75%, transparent 100%);
    background-size: 50% 100%;
    animation: bannerShimmer 10s linear infinite;
    z-index: -1;
    pointer-events: none;
    will-change: transform, opacity;
    transform: translate3d(0, 0, 0);
    opacity: 0.65;
    transition: opacity var(--transition-smooth);
}

.global-top-announcement-bar:hover::before {
    opacity: 1;
}

.global-top-announcement-bar:hover {
    border-bottom-color: color-mix(in srgb, var(--accent-primary) 35%, transparent);
    box-shadow: 0 4px 15px color-mix(in srgb, var(--accent-glow) 25%, transparent);
}

.global-top-announcement-bar .announcement-scroll-icon {
    display: inline-block;
    color: var(--accent-primary);
    font-size: 1rem;
    flex-shrink: 0;
    animation: scrollPulse 3s ease-in-out infinite;
    filter: drop-shadow(0 0 4px var(--accent-glow));
}

.global-top-announcement-bar .announcement-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
    max-width: 800px;
    flex: 0 1 auto;
    min-width: 0;
    overflow: hidden;
}

.global-top-announcement-bar .announcement-badge {
    color: var(--accent-primary);
    font-family: var(--font-primary);
    text-transform: uppercase;
    font-weight: 900;
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    flex-shrink: 0;
}

.global-top-announcement-bar .announcement-message {
    color: var(--text-secondary);
    transition: color var(--transition-smooth);
    font-family: var(--font-body);
    font-size: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
    width: 100%;
    text-align: left;
}

.global-top-announcement-bar .announcement-message strong {
    font-family: var(--font-primary);
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.global-top-announcement-bar:hover .announcement-message {
    color: var(--text-primary);
}

.global-top-announcement-bar .announcement-arrow {
    font-size: 0.8rem;
    color: var(--accent-primary);
    transition: transform var(--transition-smooth);
    flex-shrink: 0;
}

.global-top-announcement-bar:hover .announcement-arrow {
    transform: translateX(4px);
}