/* ============================================
   HEADER & NAVIGATION STYLES
   ============================================ */

/* ===== STICKY HEADER ===== */
/* Header placeholder needs to be sticky for includes to work */
#header-placeholder {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
}

header {
    background-color: rgba(0, 0, 0, 0.95);
    padding: var(--spacing-md) var(--spacing-3xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    transition: padding var(--transition-normal);
}

header.scrolled {
    padding: var(--spacing-sm) var(--spacing-3xl);
    box-shadow: var(--shadow-lg);
}

/* ===== LOGO ===== */
.logo {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--color-text);
    letter-spacing: 1px;
    transition: color var(--transition-normal);
    text-decoration: none;
}

.logo:hover {
    color: var(--color-primary);
}

/* ===== NAVIGATION ICONS ===== */
.nav-icons {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-icons a {
    color: var(--color-text);
    font-size: 20px;
    text-decoration: none;
    transition: all var(--transition-normal);
    position: relative;
}

.nav-icons a:hover {
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* Icon glow effect on hover */
.nav-icons a:hover i {
    filter: drop-shadow(0 0 8px var(--color-primary));
}

/* ===== HAMBURGER MENU ===== */
.hamburger {
    cursor: pointer;
    font-size: 24px;
    transition: all var(--transition-normal);
    padding: var(--spacing-xs);
}

.hamburger:hover {
    color: var(--color-primary);
    transform: scale(1.1);
}

/* ===== MOBILE MENU ===== */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background-color: rgba(40, 40, 40, 0.98);
    backdrop-filter: blur(10px);
    transition: right var(--transition-smooth);
    z-index: var(--z-mobile-menu);
    padding: var(--spacing-4xl) var(--spacing-xl);
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.5);
}

.mobile-menu.active {
    right: 0;
}

/* Backdrop overlay */
.mobile-menu::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
    z-index: -1;
}

.mobile-menu.active::before {
    opacity: 1;
    pointer-events: all;
}

/* Menu links */
.mobile-menu a {
    display: block;
    color: var(--color-text);
    text-decoration: none;
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-lg);
    border-bottom: 1px solid #555;
    transition: all var(--transition-normal);
    opacity: 0;
    transform: translateX(20px);
}

.mobile-menu.active a {
    opacity: 1;
    transform: translateX(0);
}

/* Stagger animation for menu items */
.mobile-menu.active a:nth-child(1) {
    transition-delay: 0.1s;
}

.mobile-menu.active a:nth-child(2) {
    transition-delay: 0.15s;
}

.mobile-menu.active a:nth-child(3) {
    transition-delay: 0.2s;
}

.mobile-menu.active a:nth-child(4) {
    transition-delay: 0.25s;
}

.mobile-menu.active a:nth-child(5) {
    transition-delay: 0.3s;
}

.mobile-menu.active a:nth-child(6) {
    transition-delay: 0.35s;
}

.mobile-menu.active a:nth-child(7) {
    transition-delay: 0.4s;
}

.mobile-menu.active a:nth-child(8) {
    transition-delay: 0.45s;
}

.mobile-menu a:hover {
    color: var(--color-primary);
    padding-left: var(--spacing-sm);
    border-bottom-color: var(--color-primary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    header {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .nav-icons {
        gap: var(--spacing-md);
    }

    .nav-icons a {
        font-size: 18px;
    }
}