/* ============================================
   Layout - Header, Nav, Footer, Content Shell
   ============================================ */

/* --- Particle Canvas (behind everything) --- */

#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-particles);
    pointer-events: none;
}

/* --- Site Header / Navigation --- */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: var(--z-header);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-xl);
    background: rgba(10, 10, 26, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 255, 255, 0.08);
    transition: background var(--transition-base);
}

.site-header.scrolled {
    background: rgba(10, 10, 26, 0.95);
    border-bottom-color: rgba(0, 255, 255, 0.15);
}

.nav-brand {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--neon-cyan);
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
    white-space: nowrap;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    padding: var(--space-sm) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--neon-cyan);
    box-shadow: 0 0 8px var(--glow-cyan);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--neon-cyan);
}

.nav-link.active::after,
.nav-link:hover::after {
    transform: scaleX(1);
}

/* Hamburger menu button */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
    cursor: pointer;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--neon-cyan);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.hamburger.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.open span:nth-child(2) {
    opacity: 0;
}
.hamburger.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Main Content Area --- */

#page-content {
    position: relative;
    z-index: var(--z-content);
    min-height: 100vh;
    padding-top: var(--nav-height);
    padding-bottom: var(--player-height);
}

/* Page transitions */
#page-content.page-exit {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.25s ease, transform 0.25s ease;
}

#page-content.page-enter {
    animation: pageEnter 0.4s ease forwards;
}

@keyframes pageEnter {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Content Container --- */

.container {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* --- Section Base --- */

.section {
    padding: var(--space-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-header h2 {
    margin-bottom: var(--space-md);
}

.section-header p {
    max-width: 600px;
    margin: 0 auto;
}

/* --- Site Footer --- */

.site-footer {
    position: relative;
    z-index: var(--z-content);
    padding: var(--space-3xl) var(--space-xl) calc(var(--space-3xl) + var(--player-height));
    background: var(--bg-secondary);
    border-top: 1px solid rgba(0, 255, 255, 0.08);
    text-align: center;
}

.footer-top {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
}

/* --- Footer Logo --- */
.footer-logo-link {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    text-decoration: none;
}

.footer-logo {
    height: 52px;
    width: auto;
    opacity: 0.5;
    transition: opacity 0.4s ease, transform 0.4s ease, filter 0.4s ease;
    filter: drop-shadow(0 0 4px rgba(0, 255, 255, 0.1));
}

.footer-logo-glow {
    position: absolute;
    inset: -8px;
    border-radius: 50%;
    opacity: 0;
    background: radial-gradient(circle, rgba(0, 255, 255, 0.12) 0%, transparent 70%);
    transition: opacity 0.4s ease;
    pointer-events: none;
    animation: orbitPulse 3s ease-in-out infinite paused;
}

.footer-logo-link:hover .footer-logo {
    opacity: 1;
    transform: scale(1.2);
    filter:
        drop-shadow(0 0 8px rgba(0, 255, 255, 0.4))
        drop-shadow(0 0 20px rgba(0, 255, 255, 0.2))
        drop-shadow(0 0 40px rgba(255, 0, 255, 0.1));
}

.footer-logo-link:hover .footer-logo-glow {
    opacity: 1;
    animation-play-state: running;
}

@keyframes orbitPulse {
    0%   { transform: rotate(0deg) scale(1); opacity: 0.8; }
    25%  { transform: rotate(90deg) scale(1.15); opacity: 1; }
    50%  { transform: rotate(180deg) scale(1); opacity: 0.6; }
    75%  { transform: rotate(270deg) scale(1.15); opacity: 1; }
    100% { transform: rotate(360deg) scale(1); opacity: 0.8; }
}

/* --- Footer Main Content --- */
.footer-main {
    text-align: left;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.footer-links a {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--neon-cyan);
}

.footer-copy {
    font-size: var(--text-xs);
    color: var(--text-muted);
    opacity: 0.7;
}