/* ============================================
   Header / Navigation
   ============================================ */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.site-header.header--scrolled {
    background-color: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Logo */
.header-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--text-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    z-index: 1001;
}

.header-logo svg,
.header-logo img {
    height: 36px;
    width: auto;
}

.header-logo .logo-text {
    font-size: var(--text-xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.01em;
}

.header-logo .logo-text span {
    color: var(--color-accent-light);
}

/* Navigation */
.header-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-link {
    padding: 8px 16px;
    font-size: var(--text-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background-color var(--transition-fast);
    white-space: nowrap;
}

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

.nav-link.active {
    background: rgba(37, 99, 235, 0.1);
    color: var(--color-accent-light);
}

/* Dropdown */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    font-size: var(--text-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.nav-dropdown-toggle:hover {
    color: var(--color-white);
}

.nav-dropdown-toggle svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown-toggle svg {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    padding: var(--spacing-xs);
    background: var(--color-surface-card);
    border: 1px solid var(--color-surface-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-link {
    display: block;
    padding: 10px 14px;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-dropdown-link:hover {
    background: var(--color-accent-glow);
    color: var(--color-accent-light);
}

/* Header CTA */
.header-cta {
    margin-left: var(--spacing-sm);
}

.header-cta .btn {
    padding: 10px 24px;
    font-size: var(--text-sm);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    z-index: 1001;
    border-radius: var(--radius-md);
}

.mobile-menu-toggle svg {
    width: 24px;
    height: 24px;
}

.mobile-menu-toggle .icon-close {
    display: none;
}

.mobile-menu-toggle.is-active .icon-menu {
    display: none;
}

.mobile-menu-toggle.is-active .icon-close {
    display: block;
}

/* Mobile Navigation Overlay */
.mobile-nav-overlay {
    display: none;
}