/* === SITE HEADER === */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--color-bg-dark);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

/* Branding */
.site-branding a { display: flex; align-items: center; }
.custom-logo { height: 36px; width: auto; }

.site-title {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text-inverse);
    letter-spacing: -0.5px;
}

.site-title-adagio { color: var(--color-text-inverse); }
.site-title-hifi { color: var(--color-accent); }

/* Navigation */
.main-navigation .nav-menu {
    display: flex;
    gap: 4px;
}

.main-navigation .nav-menu li { position: relative; }

.main-navigation .nav-menu a {
    display: block;
    padding: 8px 14px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.main-navigation .nav-menu a:hover,
.main-navigation .nav-menu .current-menu-item > a {
    color: var(--color-text-inverse);
    background: rgba(255, 255, 255, 0.08);
}

/* Dropdown */
.main-navigation .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--transition);
    box-shadow: var(--shadow-lg);
}

.main-navigation li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-navigation .sub-menu a {
    padding: 8px 12px;
    font-size: 13px;
    border-radius: var(--radius-sm);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-search {
    position: relative;
    display: flex;
    align-items: center;
}

.header-search-input {
    width: 0;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--color-text-inverse);
    font-size: 14px;
    font-family: var(--font-body);
    outline: none;
    transition: width 300ms ease, padding 300ms ease;
}

.header-search-input:focus,
.header-search.active .header-search-input {
    width: 200px;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
}

.header-search-input::placeholder { color: rgba(255, 255, 255, 0.4); }

.header-search-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.header-search-submit:hover { color: var(--color-text-inverse); background: rgba(255, 255, 255, 0.08); }

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    padding: 8px;
    cursor: pointer;
    border-radius: var(--radius-sm);
}

.hamburger-line {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text-inverse);
    border-radius: 1px;
    transition: all 300ms ease;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) { opacity: 0; }
.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Category Bar */
.category-bar {
    background: var(--color-primary-light);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.category-bar-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.category-bar-inner::-webkit-scrollbar { display: none; }

.category-menu {
    display: flex;
    gap: 2px;
    white-space: nowrap;
}

.category-menu a {
    display: block;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.65);
    border-bottom: 2px solid transparent;
    transition: all var(--transition);
}

.category-menu a:hover,
.category-menu .current-menu-item > a {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}