/*
  Helionyx.com - Layout Styles (layout.css)
  Version: 3.0.4 (Helium Branding Theme Update)
  Author: Helionyx LLC (via AI Collaboration)
  Date: May 24, 2024

  Purpose:
  Defines styles for major layout components with the new "Helium" branding.
*/

/* --- Header & Navigation (Centered Logo Design - Helium Theme) --- */
#main-header {
    background-color: var(--color-helium-dark-bg); /* Dark header to match footer */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    min-height: 80px;
    display: flex;
    align-items: center;
}

#main-header .header-container-centered-logo {
    display: flex;
    justify-content: center; /* Center everything */
    align-items: center;
    width: 100%;
    height: 100%;
    max-width: 850px; /* A tad wider for more comfortable spacing */
    margin: 0 auto; /* Center the header content */
    padding: 0 var(--spacing-xs); /* Minimal padding */
    gap: var(--spacing-md); /* Slightly more space between nav sections and logo */
}

.logo-link-centered {
    padding: 0; /* Remove logo padding */
    line-height: 0;
    display: inline-flex;
    align-items: center;
}

.logo-img {
    max-height: 55px;
    height: auto;
    width: auto;
    object-fit: contain;
    display: block;
}

#primary-navigation-left,
#primary-navigation-right {
    display: flex;
    align-items: center;
}

.nav-links-left,
.nav-links-right {
    display: flex;
    align-items: center;
    gap: 8px; /* A tad more space between links for comfortable reading */
    list-style: none;
    padding: 0;
    margin: 0;
}
.nav-links-left {
    justify-content: flex-end; /* Align right towards logo */
    margin-right: 0; /* Remove auto margin */
}
.nav-links-right {
    justify-content: flex-start; /* Align left towards logo */
    margin-left: 0; /* Remove auto margin */
}

#primary-navigation-left .nav-links a,
#primary-navigation-right .nav-links a {
    color: var(--text-color-on-dark); /* Light text for dark header */
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    padding: var(--spacing-sm) 4px; /* Slightly more horizontal padding for comfort */
    position: relative;
    text-transform: uppercase;
    font-size: 1.05rem; /* Increased font size */
    letter-spacing: 0.8px; /* Slightly increased letter spacing */
    white-space: nowrap;
    transition: color 0.2s ease, transform 0.1s ease; /* Smooth transitions */
}
#primary-navigation-left .nav-links a::after,
#primary-navigation-right .nav-links a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2.5px;
    background-color: var(--color-helium-accent-blue); /* Blue underline */
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1); /* Smoother easing */
    will-change: width; /* Optimize for animations */
}
#primary-navigation-left .nav-links a:hover::after,
#primary-navigation-left .nav-links a.active::after,
#primary-navigation-right .nav-links a:hover::after,
#primary-navigation-right .nav-links a.active::after {
    width: 100%;
}
#primary-navigation-left .nav-links a.active,
#primary-navigation-right .nav-links a.active {
    color: var(--color-helium-accent-blue-light); /* Lighter blue for dark header */
}


/* Mobile Navigation Toggle (Hamburger) */
#mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    z-index: 1001;
}
#mobile-nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    /* Light lines for dark header */
    background-color: var(--text-color-on-dark);
    margin: 5px 0;
    transition: all var(--transition-base);
    border-radius: 3px;
}


/* Mobile Navigation Container (The slide-out menu) */
.mobile-nav-container-styles {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(85vw, 300px);
    height: 100vh;
    background-color: rgba(30, 35, 50, 0.99); /* Dark background to match header */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: var(--spacing-xxl) var(--spacing-lg) var(--spacing-lg);
    box-shadow: -8px 0 25px rgba(42, 45, 58, 0.15);
    transition: right 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    z-index: 999;
    overflow-y: auto;
}
.mobile-nav-container-styles.open {
    right: 0;
}

#mobile-nav-links-list {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
    list-style: none;
    padding: 0;
    margin: 0;
}
#mobile-nav-links-list a {
    font-size: 1.1rem;
    padding: var(--spacing-sm) 0;
    width: 100%;
    color: var(--text-color-on-dark); /* Light text for dark mobile menu */
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
}
#mobile-nav-links-list a.active {
    color: var(--color-helium-accent-blue-light); /* Lighter blue for active link on dark background */
}
#mobile-nav-links-list a::after { display: none; }


/* --- Footer (Shared - Helium Theme) --- */
#main-footer {
    background-color: var(--color-helium-dark-bg);
    color: var(--text-color-on-dark);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}
.footer-content {
    display: grid;
    grid-template-columns: 1.4fr 0.8fr 0.6fr 1.2fr;
    gap: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-left: var(--spacing-lg);
}

.footer-brand h4 {
    color: var(--text-color-on-dark);
    margin-bottom: var(--spacing-md);
}

.footer-brand .footer-tagline {
    color: white;
    font-style: italic;
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.footer-brand .footer-email {
    color: white !important;
    font-weight: var(--font-weight-semibold);
}

.footer-links h4,
.footer-social-legal h4,
.footer-helios h4 {
    color: var(--text-color-on-dark);
    margin-bottom: var(--spacing-md);
}

.footer-links ul,
.footer-social-legal ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li,
.footer-social-legal li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a,
.footer-social-legal a {
    color: white;
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer-links a:hover,
.footer-social-legal a:hover {
    color: white;
}

.social-links-vertical li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.social-links-vertical img {
    width: 20px;
    height: 20px;
    opacity: 0.8;
}

.footer-helios {
    text-align: center;
}

.footer-helios h4 {
    text-align: center;
}

.footer-helios p {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    color: white;
    text-align: left;
}

.footer-helios input {
    width: 100%;
    margin-bottom: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-small);
    border: 1px solid var(--border-color-dark-accent);
    background-color: rgba(234, 234, 239, 0.08);
    color: var(--text-color-on-dark);
}

.footer-helios .btn {
    width: 100%;
}

.footer-helios .legal-text {
    font-size: 0.75rem;
    margin-top: var(--spacing-xs);
    opacity: 0.8;
    text-align: center;
    color: white;
}

.footer-helios .legal-text a {
    color: white;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    border-top: 1px solid rgba(204, 204, 204, 0.15);
    padding-top: var(--spacing-lg);
    width: 100%;
}

.footer-bottom p {
    color: white;
    opacity: 0.9;
    font-size: 0.9rem;
    margin: 0 auto var(--spacing-sm) auto;
    text-align: center;
    width: 100%;
}

.footer-bottom p:last-child {
    opacity: 0.8;
    font-size: 0.85rem;
    margin: 0 auto;
}
.footer-logo-img {
    max-width: 100px;
    margin-bottom: var(--spacing-sm);
    /* Consider filter: grayscale(80%) brightness(150%); if you want the footer logo more monochrome */
}
.footer-column h4 {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-bold);
    color: var(--text-color-on-dark); /* Same as header nav links */
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
    letter-spacing: 0.5px;
}
.footer-column ul li {
    margin-bottom: var(--spacing-sm);
}
.footer-column ul a {
    color: var(--text-color-on-dark-muted); /* Uses new --color-helium-grey-medium */
    text-decoration: none;
    font-size: 0.95rem;
}
.footer-column ul a:hover,
.footer-column ul a:focus-visible {
    color: var(--color-helium-accent-blue); /* Blue hover for links */
    text-decoration: underline;
}
.footer-column.footer-brand p {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color-on-dark-muted);
}
.footer-tagline {
    font-style: italic;
    opacity: 0.9;
    margin-bottom: var(--spacing-sm) !important;
}
.footer-email {
    color: var(--color-helium-accent-blue) !important; /* Blue for email link */
    font-weight: var(--font-weight-semibold);
}
.social-links {
    display: flex;
    gap: var(--spacing-md);
}
.social-links img {
    width: 24px;
    height: 24px;
    opacity: 0.7; /* Slightly less opacity for a muted look */
    transition: opacity var(--transition-base), transform var(--transition-base);
    /* Consider filter: grayscale(100%) contrast(200%); for B&W icons that pop on hover */
}
.social-links a:hover img,
.social-links a:focus-visible img {
    opacity: 1;
    transform: scale(1.15) rotate(5deg);
    /* filter: none; /* Remove filter on hover if applied */
}
.footer-bottom {
    border-top: 1px solid rgba(204, 204, 204, 0.15); /* Lighter, less visible border */
    padding-top: var(--spacing-lg);
    text-align: center;
}
.footer-bottom p {
    color: var(--text-color-on-dark-muted);
    opacity: 0.8;
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
}
.footer-secret {
    font-size: 0.75rem;
    color: rgba(29, 63, 145, 0.3); /* Faint blue */
    text-decoration: none;
    display: inline-block;
    margin-top: var(--spacing-xs);
    transition: color var(--transition-base), transform var(--transition-base);
}
.footer-secret:hover,
.footer-secret:focus-visible {
    color: var(--color-helium-accent-purple); /* Purple on hover for contrast */
    transform: scale(1.1);
}

/* --- General Layout Grids (Structure unchanged, colors inherited) --- */
.feature-grid,
.pillars-grid,
.universe-grid,
.article-grid,
.toolkits-grid,
.project-item-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.feature-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.pillars-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.universe-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.article-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.toolkits-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.glimpse-grid { gap: var(--spacing-lg); }

.mission-vision-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}
.philosophy-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}
.column-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}


/* --- Responsive Adjustments for Layout Elements (Helium Theme) --- */
@media (max-width: 991px) {
    #main-header .header-container-centered-logo {
        max-width: 720px; /* Slightly more room on medium screens */
    }
    .nav-links-left, .nav-links-right {
        gap: 4px; /* A bit more space on medium screens */
    }
    #primary-navigation-left .nav-links a,
    #primary-navigation-right .nav-links a {
        font-size: 0.95rem; /* Slightly larger than before */
        letter-spacing: 0.6px;
        padding: var(--spacing-sm) 3px; /* Slightly more comfortable padding */
    }
    .logo-img {
        max-height: 50px;
    }
     #main-header {
        min-height: 70px;
    }
    /* General Grids */
    .pillars-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 270px), 1fr)); }
    .universe-grid, .project-item-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr)); }
    .article-grid, .toolkits-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
    .philosophy-content { grid-template-columns: 1fr; }
    .philosophy-image-container { order: 0; margin-bottom: var(--spacing-lg); }
}

@media (max-width: 767px) {
    #main-header .header-container-centered-logo {
        padding: 0 var(--spacing-xs); /* Even less padding on mobile */
    }
    #primary-navigation-left, #primary-navigation-right { display: none; }
    .logo-link-centered { padding: 0; margin-right: auto; }
    .logo-img { max-height: 45px; }
    #main-header { min-height: 60px; padding: var(--spacing-xs) 0; }
    #mobile-nav-toggle { display: flex; }
    #mobile-nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    #mobile-nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; transform: translateX(-20px); }
    #mobile-nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

    /* Footer Mobile */
    .footer-content { grid-template-columns: 1fr; text-align: center; }
    .footer-column { margin-bottom: var(--spacing-lg); }
    .social-links { justify-content: center; }
    .footer-column ul { padding-left: 0; }
}

@media (min-width: 600px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
    .pillars-grid, .glimpse-grid .universe-grid,
    .operating-framework .pillars-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 992px) {
    .feature-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-lg);
    }
    .universe-grid:not(.glimpse-grid .universe-grid) {
         grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .mission-vision-grid { grid-template-columns: 1fr 1fr; }
    .column-layout { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 992px) {
    .philosophy-content { grid-template-columns: minmax(300px, 1fr) 1.5fr; }
    .philosophy-image-container { order: -1; }
}

@media (max-width: 480px) {
    .footer-column { text-align: left; }
    .social-links { justify-content: flex-start; }
}

/* End of layout.css - Helium Theme */