/* ============================================
   Layout — Header, nav, sections, footer
   ============================================ */

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    flex-shrink: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 calc(var(--space-xl) + 32px) 0 var(--space-xl);
}

.site-header__logo {
    font-size: var(--text-lg);
    font-weight: 300;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--cyan);
    text-shadow:
        0 0 10px rgba(0, 229, 255, 0.9),
        0 0 30px rgba(0, 229, 255, 0.7),
        0 0 60px rgba(0, 229, 255, 0.5),
        0 0 100px rgba(0, 229, 255, 0.3),
        0 0 150px rgba(0, 229, 255, 0.15);
}

/* Desktop nav — overlaps header via negative margin */
.site-nav {
    position: sticky;
    top: 0;
    height: var(--header-height);
    flex-shrink: 0;
    margin-top: calc(-1 * var(--header-height));
    display: flex;
    gap: var(--space-lg);
    align-items: center;
    justify-content: flex-end;
    padding: 0 calc(var(--space-xl) + 32px) 0 var(--space-xl);
    z-index: 101;
}

.site-nav__link {
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
    padding: var(--space-sm) 0;
    position: relative;
    text-shadow: 0 0 5px rgba(0, 229, 255, 0.15);
    animation: clickable-shimmer-dim 5s ease-in-out infinite;
    transition: color var(--transition-glow-out),
                text-shadow var(--transition-glow-out);
}

.site-nav__link:hover {
    animation: none;
    color: var(--amber);
    text-shadow: 0 0 8px rgba(255, 184, 0, 0.5), 0 0 20px rgba(255, 184, 0, 0.25);
    transition: color var(--transition-glow-in),
                text-shadow var(--transition-glow-in);
}

.site-nav__link:active {
    text-shadow: 0 0 12px rgba(255, 184, 0, 0.7), 0 0 30px rgba(255, 184, 0, 0.35);
}

.site-nav__link:focus-visible {
    outline: 2px solid var(--amber);
    outline-offset: var(--glow-focus-offset);
    text-shadow: 0 0 8px rgba(255, 184, 0, 0.5), 0 0 20px rgba(255, 184, 0, 0.25);
}

.site-nav__link--active {
    color: var(--cyan);
    animation: clickable-shimmer 5s ease-in-out infinite;
}

.site-nav__link--active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--cyan);
    box-shadow: var(--glow-cyan-sm);
}

/* Hamburger toggle (mobile) */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    padding: 4px;
    cursor: pointer;
}

.nav-toggle__bar {
    width: 100%;
    height: 2px;
    background: var(--cyan);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Mobile nav */
@media (max-width: 1023px) {
    .nav-toggle {
        display: flex;
    }

    .nav-toggle {
        position: relative;
        z-index: 101;
    }

    .site-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100% - var(--header-height));
        background: rgba(0, 0, 0, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-xl);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-base), visibility var(--transition-base);
        z-index: 100;
    }

    .site-nav--open {
        opacity: 1;
        visibility: visible;
    }

    .site-nav__link {
        font-size: var(--text-2xl);
        letter-spacing: 0.15em;
    }

    /* Animate hamburger to X */
    .nav-toggle--active .nav-toggle__bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .nav-toggle--active .nav-toggle__bar:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle--active .nav-toggle__bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
}

/* Page sections */
.page-content {
    flex: 1;
    position: relative;
    z-index: 1;
}

.section {
    padding: var(--space-4xl) var(--space-xl);
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
}

.section--full {
    max-width: none;
}

/* Grid layouts */
.grid {
    display: grid;
    gap: var(--space-xl);
}

.grid--2 {
    grid-template-columns: 1fr;
}

.grid--3 {
    grid-template-columns: 1fr;
}

.grid--4 {
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .grid--2 { grid-template-columns: repeat(2, 1fr); }
    .grid--3 { grid-template-columns: repeat(2, 1fr); }
    .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
    .grid--3 { grid-template-columns: repeat(3, 1fr); }
    .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* Footer */
.site-footer {
    position: relative;
    z-index: 1;
    background: var(--footer-bg);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border-top: 1px solid var(--border);
    padding: var(--space-2xl) var(--space-xl);
}

.site-footer__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    align-items: center;
    text-align: center;
}

@media (min-width: 768px) {
    .site-footer__inner {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.site-footer__nav {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.site-footer__nav a {
    font-size: var(--text-sm);
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    animation: clickable-shimmer-dim 5s ease-in-out infinite;
    transition: color var(--transition-glow-out);
}

.site-footer__nav a:hover {
    animation: none;
    color: var(--amber);
    transition: color var(--transition-glow-in);
}

.site-footer__copyright {
    font-size: var(--text-sm);
    color: var(--text-dim);
}

.site-footer__contact a {
    color: var(--cyan-dim);
    animation: clickable-shimmer 5s ease-in-out infinite;
    transition: color var(--transition-glow-out);
}

.site-footer__contact a:hover {
    animation: none;
    color: var(--amber);
    transition: color var(--transition-glow-in);
}