/* ============================================================
   HEADER.CSS – Sticky Navbar
   Networld Asia – Digital Marketing Landing Page
   Breakpoints: ≤900px = tablet/mobile → hamburger
   ============================================================ */

/* ─────────────── Header Bar ─────────────── */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    height: var(--navbar-h);
    background: rgba(255, 255, 255, 1.0);
    transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 0.1rem 2.4rem var(--color-shadow-header);
    border-bottom: 1px solid var(--color-border);
}

.header__inner {
    height: var(--navbar-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

/* ─────────────── Logo ─────────────── */
.header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    flex-shrink: 0;
}

.header__logo-img {
    height: 56px;
    width: auto;
    object-fit: contain;
}

.header__logo-wordmark {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.03em;
}

.header__logo-wordmark span {
    color: var(--color-secondary);
}

/* ─────────────── Desktop Navigation ─────────────── */
.header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* Nav item wrapper (for dropdown positioning) */
.nav__item {
    position: relative;
}

/* Both <a> and <button> nav links */
.nav__link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) 1.4rem;
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    background: none;
    border: none;
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast);
    white-space: nowrap;
    line-height: 1.4;
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-primary);
    background: var(--color-primary-hover-bg);
}

.nav__link-arrow {
    flex-shrink: 0;
    transition: transform var(--transition-base);
}

.nav__item:hover .nav__link-arrow,
.nav__item.open .nav__link-arrow {
    transform: rotate(180deg);
}

/* ─────────────── Dropdown ─────────────── */
.nav__dropdown {
    position: absolute;
    top: calc(100% + 1px);
    left: 50%;
    transform: translateX(-50%) translateY(-6px);
    min-width: 210px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--space-xs);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
    z-index: var(--z-dropdown);
}

.nav__item:hover .nav__dropdown,
.nav__item.open .nav__dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.nav__dropdown-link {
    display: flex;
    align-items: center;
    padding: 1.0rem 1.4rem;
    font-size: var(--font-sm);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.nav__dropdown-link:hover {
    color: var(--color-primary);
    background: var(--color-primary-hover-bg);
}

/* ─────────────── Actions (Desktop CTA) ─────────────── */
.header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-shrink: 0;
}

/* ─────────────── Hamburger ─────────────── */
.header__hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: var(--size-touch);
    height: var(--size-touch);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: none;
    background: none;
    transition: background var(--transition-fast);
    flex-shrink: 0;
}

.header__hamburger:hover {
    background: var(--color-primary-hover-bg);
}

.header__hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: var(--radius-full);
    transform-origin: center;
    transition: transform var(--transition-base), opacity var(--transition-base), width var(--transition-base);
}

/* Hamburger → X animation */
.header__hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.header__hamburger.open span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.header__hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ─────────────── Backdrop Overlay ─────────────── */
.header__backdrop {
    position: fixed;
    inset: 0;
    background: var(--color-overlay-dark);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: calc(var(--z-sticky) - 2);
    opacity: 0;
    /* Never blocks clicks when closed */
    pointer-events: none;
    visibility: hidden;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.header__backdrop.open {
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
}

/* ─────────────── Mobile Menu Panel ─────────────── */
.header__mobile-menu {
    position: fixed;
    top: var(--navbar-h);
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    background: var(--color-surface);
    z-index: calc(var(--z-sticky) - 1);
    padding: var(--space-md) var(--space-lg) var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
    box-shadow: -0.4rem 0 3.2rem var(--color-shadow-panel);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    border-left: 1px solid var(--color-border);
}

.header__mobile-menu.open {
    transform: translateX(0);
}

/* Mobile nav links */
.mobile-nav__link {
    display: flex;
    align-items: center;
    padding: 1.4rem 1.6rem;
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    border-bottom: 1px solid var(--color-border);
    transition: color var(--transition-fast), background var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav__link:hover {
    color: var(--color-primary);
    background: var(--color-primary-hover-bg);
    padding-left: 2.2rem;
}

/* Mobile dropdown group */
.mobile-nav__group {
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav__toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: none;
    border-radius: var(--radius-md);
    background: none;
    cursor: pointer;
    text-align: left;
}

.mobile-nav__toggle-icon {
    transition: transform 0.25s ease;
    flex-shrink: 0;
}

.mobile-nav__toggle[aria-expanded="true"] .mobile-nav__toggle-icon {
    transform: rotate(180deg);
}

.mobile-nav__dropdown {
    display: flex;
    flex-direction: column;
    background: var(--color-primary-hover-bg, #f0f4ff);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    overflow: hidden;
}

.mobile-nav__dropdown[hidden] {
    display: none;
}

.mobile-nav__sub-link {
    display: block;
    padding: 1rem 1.6rem 1rem 2.4rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-primary);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: color var(--transition-fast), background var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav__sub-link:last-child {
    border-bottom: none;
}

.mobile-nav__sub-link:hover {
    color: var(--color-primary);
    background: rgba(59, 130, 246, 0.08);
    padding-left: 3rem;
}


/* ─── Mobile Menu Footer ─── */
.mobile-nav__footer {
    margin-top: auto;
    padding-top: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* CTAs: stacked full-width (HubSpot style) */
.mobile-nav__ctas {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.mobile-nav__cta {
    width: 100%;
    justify-content: center;
    font-size: var(--font-base);
    padding: 1.4rem var(--space-lg);
    border-radius: var(--radius-md);
}

/* Divider (HubSpot style clear separator) */
.mobile-nav__divider {
    height: 1px;
    background: var(--color-border);
    margin-block: var(--space-sm);
}

/* ─── Contact Info Block ─── */
.mobile-nav__contact {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* 2-column grid: phone + email */
.mobile-nav__contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

/* Card style (phone and email) */
.mobile-nav__contact-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
    padding: 12px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.mobile-nav__contact-card:hover {
    background: var(--color-primary-hover-bg);
    border-color: var(--color-primary-border);
    transform: translateY(-1px);
}

.mobile-nav__contact-card .mobile-nav__contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--size-icon-sm);
    height: var(--size-icon-sm);
    background: var(--color-primary-subtle);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    flex-shrink: 0;
}

.mobile-nav__contact-card .mobile-nav__contact-label {
    font-size: 1.0rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
}

.mobile-nav__contact-card .mobile-nav__contact-value {
    font-size: var(--font-xs);
    font-weight: 600;
    color: var(--color-primary);
    line-height: 1.3;
    word-break: break-all;
}

/* Address row: full-width with icon + text side by side */
.mobile-nav__contact-addr {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: 1.2rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

a.mobile-nav__contact-addr:hover {
    background: var(--color-primary-hover-bg);
    border-color: var(--color-primary-border);
    transform: translateY(-1px);
}

a.mobile-nav__contact-addr .mobile-nav__contact-value {
    color: var(--color-primary);
    font-weight: 500;
}

.mobile-nav__contact-addr .mobile-nav__contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--size-icon-sm);
    height: var(--size-icon-sm);
    background: var(--color-primary-subtle);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 1px;
}

.mobile-nav__contact-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mobile-nav__contact-text .mobile-nav__contact-label {
    font-size: 1.0rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
}

.mobile-nav__contact-text .mobile-nav__contact-value {
    font-size: var(--font-xs);
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* ─── Social Row (Linear-style bottom bar) ─── */
.mobile-nav__social {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-xs);
}

.mobile-nav__social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--size-icon-md);
    height: var(--size-icon-md);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.mobile-nav__social-link:hover {
    color: var(--color-primary);
    background: var(--color-primary-hover-bg);
    border-color: var(--color-primary-border);
    transform: translateY(-2px);
}



/* ─────────────── Responsive – Tablet & Mobile (≤ 900px) ─────────────── */
@media (max-width: 900px) {

    /* Hide desktop nav */
    .header__nav {
        display: none;
    }

    /* Show hamburger */
    .header__hamburger {
        display: flex;
    }

    /* Hide desktop CTA btn */
    .header__actions .btn {
        display: none;
    }

    /* Backdrop is always in DOM, shown via .open class (pointer-events handled there) */
}

/* ─────────────── Tablet tweak (768px – 900px) ─────────────── */
@media (max-width: 900px) and (min-width: 601px) {
    .header__logo-img {
        height: 48px;
    }

    /* Wider panel on tablet */
    .header__mobile-menu {
        width: min(380px, 75vw);
        padding: var(--space-lg) var(--space-xl) var(--space-2xl);
    }

    .mobile-nav__link {
        font-size: var(--font-md);
        padding: 16px 20px;
    }
}

/* ─────────────── Mobile (≤ 600px) ─────────────── */
@media (max-width: 600px) {
    .header__logo-img {
        height: 42px;
    }

    /* Full-width slide-in on mobile */
    .header__mobile-menu {
        width: 100%;
        border-left: none;
        box-shadow: none;
        padding: var(--space-md) var(--space-md) var(--space-2xl);
    }

    .mobile-nav__link {
        font-size: var(--font-base);
        padding: 16px 16px;
    }
}