/* ===== HEADER & NAVIGATION ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    padding: var(--space-md) 0;
    transition: all var(--transition-base)
}

.header.scrolled {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-sm) 0;
    box-shadow: var(--shadow-sm)
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between
}

.header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: var(--fw-bold);
    color: #fff
}

.header.scrolled .header__logo {
    color: var(--color-primary)
}

[data-theme="dark"] .header.scrolled .header__logo {
    color: var(--color-text)
}

.header__logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center
}

.header__logo-icon svg {
    width: 100%;
    height: 100%
}

.header__logo span {
    display: flex;
    flex-direction: column;
    line-height: 1.1
}

.header__logo .logo-sub {
    font-size: 0.65rem;
    font-family: var(--font-body);
    font-weight: var(--fw-normal);
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-accent);
    opacity: 0.9
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: var(--space-2xl)
}

.nav__list {
    display: flex;
    gap: var(--space-lg)
}

.nav__link {
    font-size: var(--fs-small);
    font-weight: var(--fw-medium);
    color: rgba(255, 255, 255, 0.85);
    letter-spacing: 0.3px;
    padding: var(--space-xs) 0;
    position: relative;
    transition: color var(--transition-fast)
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base)
}

.nav__link:hover,
.nav__link.active {
    color: #fff
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%
}

.header.scrolled .nav__link {
    color: var(--color-text-secondary)
}

.header.scrolled .nav__link:hover,
.header.scrolled .nav__link.active {
    color: var(--color-primary)
}

[data-theme="dark"] .header.scrolled .nav__link {
    color: var(--color-muted)
}

[data-theme="dark"] .header.scrolled .nav__link:hover {
    color: var(--color-text)
}

/* Nav Dropdown */
.nav__item {
    position: relative
}

.nav__dropdown {
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--space-sm) 0;
    min-width: 220px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    pointer-events: none
}

[dir="rtl"] .nav__dropdown {
    left: auto;
    right: 50%;
    transform: translateX(50%)
}

.nav__item:hover .nav__dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    top: calc(100% + 4px)
}

.nav__dropdown a {
    display: block;
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--fs-small);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast)
}

.nav__dropdown a:hover {
    background: var(--color-accent-light);
    color: var(--color-accent)
}

/* Nav Controls */
.nav__controls {
    display: flex;
    align-items: center;
    gap: var(--space-md)
}

.nav__controls button {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: rgba(255, 255, 255, 0.85);
    transition: all var(--transition-fast)
}

.nav__controls button:hover {
    background: rgba(255, 255, 255, 0.1)
}

.header.scrolled .nav__controls button {
    color: var(--color-text-secondary)
}

.header.scrolled .nav__controls button:hover {
    background: var(--color-accent-light);
    color: var(--color-accent)
}

[data-theme="dark"] .header.scrolled .nav__controls button {
    color: var(--color-muted)
}

/* Mobile Menu Button */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    cursor: pointer
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: rgba(255, 255, 255, 0.85);
    transition: all var(--transition-base);
    transform-origin: center
}

.header.scrolled .menu-toggle span {
    background: var(--color-text)
}

[data-theme="dark"] .header.scrolled .menu-toggle span {
    background: var(--color-text)
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px)
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px)
}

/* Mobile Overlay */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(380px, 85vw);
    height: 100vh;
    background: var(--color-surface);
    z-index: var(--z-overlay);
    transition: right var(--transition-heavy);
    overflow-y: auto;
    padding: 5rem var(--space-xl) var(--space-xl)
}

[dir="rtl"] .mobile-nav {
    right: auto;
    left: -100%;
    transition: left var(--transition-heavy)
}

.mobile-nav.open {
    right: 0
}

[dir="rtl"] .mobile-nav.open {
    left: 0
}

.mobile-nav__overlay {
    position: fixed;
    inset: 0;
    background: var(--color-overlay);
    z-index: calc(var(--z-overlay) - 1);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base)
}

.mobile-nav__overlay.open {
    opacity: 1;
    visibility: visible
}

.mobile-nav a {
    display: block;
    padding: var(--space-md) 0;
    font-size: 1.1rem;
    font-weight: var(--fw-medium);
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border)
}

.mobile-nav a:hover {
    color: var(--color-accent)
}

@media(max-width:1024px) {
    .nav__list {
        display: none
    }

    .menu-toggle {
        display: flex
    }
}

@media(max-width:768px) {
    .header__logo {
        font-size: 1.15rem
    }

    .header__logo-icon {
        width: 32px;
        height: 32px
    }
}