/* ─── Header Base ─────────────────────────────────────────────── */
.header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: var(--spacing-6);
}

/* ─── Logo ────────────────────────────────────────────────────── */
.header-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.header-logo img {
    height: 48px;
    width: auto;
}

/* ─── Desktop Nav ─────────────────────────────────────────────── */
.header-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    background: none;
    border: none;
    cursor: pointer;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.nav-link.is-active {
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

.nav-link.is-active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background-color: var(--color-accent);
    border-radius: var(--radius-full);
}

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

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

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

.nav-dropdown {
    position: absolute;
    top: calc(100% + var(--spacing-2));
    left: 50%;
    transform: translateX(-50%);
    min-width: 220px;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-8px);
    transition: all var(--transition-base);
    z-index: var(--z-dropdown);
}

.has-dropdown:hover .nav-dropdown,
.has-dropdown.is-open .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-dropdown-link {
    display: block;
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-dropdown-link:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding-left: var(--spacing-4);
}

/* ─── Header CTA ──────────────────────────────────────────────── */
.header-cta {
    flex-shrink: 0;
}

.header-cta .btn {
    font-size: var(--font-size-sm);
    padding: var(--spacing-2) var(--spacing-4);
}

/* ─── Mobile Toggle ───────────────────────────────────────────── */
.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-2);
    transition: background-color var(--transition-fast);
}

.mobile-toggle:hover {
    background-color: var(--color-gray-100);
}

.mobile-toggle-line {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.mobile-toggle.is-active .mobile-toggle-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.mobile-toggle.is-active .mobile-toggle-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.mobile-toggle.is-active .mobile-toggle-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ─── Mobile Menu ─────────────────────────────────────────────── */
.mobile-menu {
    position: fixed;
    inset: 0;
    z-index: var(--z-mobile);
    pointer-events: none;
}

.mobile-menu.is-open {
    pointer-events: all;
}

.mobile-menu-overlay {
    position: absolute;
    inset: 0;
    background-color: rgb(0 0 0 / 0.5);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.mobile-menu.is-open .mobile-menu-overlay {
    opacity: 1;
}

.mobile-menu-panel {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 320px;
    background-color: var(--color-white);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
}

.mobile-menu.is-open .mobile-menu-panel {
    transform: translateX(0);
}

.mobile-menu-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4) var(--spacing-5);
    border-bottom: 1px solid var(--color-border);
}

.mobile-menu-top img {
    height: 40px;
    width: auto;
}

.mobile-menu-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.mobile-menu-close:hover {
    background-color: var(--color-gray-100);
    color: var(--color-text-primary);
}

/* ─── Mobile Nav ──────────────────────────────────────────────── */
.mobile-nav-list {
    flex: 1;
    padding: var(--spacing-4) var(--spacing-3);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-3) var(--spacing-3);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    text-align: left;
}

.mobile-nav-link:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.mobile-dropdown-toggle svg {
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.mobile-nav-item-dropdown.is-open .mobile-dropdown-toggle svg {
    transform: rotate(180deg);
}

.mobile-dropdown {
    display: none;
    flex-direction: column;
    gap: var(--spacing-1);
    padding: var(--spacing-1) 0 var(--spacing-1) var(--spacing-4);
}

.mobile-nav-item-dropdown.is-open .mobile-dropdown {
    display: flex;
}

.mobile-dropdown-link {
    display: block;
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    border-left: 2px solid var(--color-border);
    transition: all var(--transition-fast);
}

.mobile-dropdown-link:hover {
    color: var(--color-primary);
    border-left-color: var(--color-accent);
    background-color: var(--color-primary-light);
}

/* ─── Mobile Menu Footer ──────────────────────────────────────── */
.mobile-menu-footer {
    padding: var(--spacing-4) var(--spacing-5);
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

/* ─── Responsive ──────────────────────────────────────────────── */
@media (max-width: 1024px) {
    .header-nav {
        display: none;
    }

    .header-cta {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }
}

@media (max-width: 768px) {
    .header-inner {
        height: 60px;
    }

    .header-logo img {
        height: 40px;
    }
}