/* ============================================================
   FYP Journey — Navbar Component
   components/navbar.css
   ============================================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-nav);
    padding-block: 1.1rem;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all var(--duration-base) var(--ease-out);
}

.navbar--scrolled {
    padding-block: 0.75rem;
    background: rgba(255, 255, 255, 0.97);
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.navbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-6);
}

/* ── Logo ── */
.navbar__logo {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: var(--font-black);
    color: var(--color-primary);
    letter-spacing: -0.03em;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
    transition: color var(--duration-fast) var(--ease-out);
}

.navbar__logo span {
    color: var(--color-accent);
}

.navbar__logo:hover {
    color: var(--color-primary-light);
}

/* ── Nav links ── */
.navbar__nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.navbar__link {
    position: relative;
    padding: 0.45rem 0.875rem;
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--duration-fast) var(--ease-out),
        background var(--duration-fast) var(--ease-out);
}

.navbar__link::after {
    content: '';
    position: absolute;
    bottom: 0px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: calc(100% - 1.75rem);
    height: 2px;
    background: var(--color-secondary);
    border-radius: var(--radius-full);
    transition: transform var(--duration-base) var(--ease-out);
    transform-origin: center;
}

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

.navbar__link:hover::after,
.navbar__link.active::after {
    transform: translateX(-50%) scaleX(1);
}

.navbar__link.active {
    color: var(--color-primary);
    font-weight: var(--font-semibold);
}

/* ── CTA button ── */
.navbar__cta {
    flex-shrink: 0;
}

/* ── Mobile hamburger ── */
.navbar__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background var(--duration-fast) var(--ease-out);
    z-index: calc(var(--z-nav) + 1);
}

.navbar__hamburger:hover {
    background: var(--color-bg-section);
}

.navbar__hamburger span {
    display: block;
    width: 24px;
    height: 2.5px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    transition: transform var(--duration-base) var(--ease-out),
        opacity var(--duration-base) var(--ease-out),
        background var(--duration-base) var(--ease-out);
    transform-origin: center;
}

/* Hamburger → X animation */
.navbar__hamburger.open span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

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

.navbar__hamburger.open span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ── Mobile menu overlay ── */
.navbar__mobile {
    display: none;
    position: fixed;
    top: 5.35rem;
    right: max(var(--container-px), 1rem);
    width: min(20rem, calc(100vw - 2rem));
    max-height: calc(100vh - 6.5rem);
    padding: 1rem;
    background: rgba(15, 30, 69, 0.96);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.28);
    z-index: calc(var(--z-nav) + 2);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0.35rem;
    overflow-y: auto;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px) scale(0.98);
    transform-origin: top right;
    transition: opacity var(--duration-base) var(--ease-out),
        transform var(--duration-base) var(--ease-out);
}

.navbar__mobile.open {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0) scale(1);
}

.navbar__mobile-link {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: var(--font-semibold);
    color: var(--color-text-white);
    text-decoration: none;
    padding: 0.9rem 1rem;
    border-radius: var(--radius-md);
    transition: color var(--duration-fast) var(--ease-out),
        background var(--duration-fast) var(--ease-out);
    transform: translateY(8px);
    opacity: 0;
    transition: transform var(--duration-base) var(--ease-out),
        opacity var(--duration-base) var(--ease-out),
        color var(--duration-fast) var(--ease-out),
        background var(--duration-fast) var(--ease-out);
}

.navbar__mobile.open .navbar__mobile-link {
    transform: translateY(0);
    opacity: 1;
}

/* Stagger mobile menu items */
.navbar__mobile.open .navbar__mobile-link:nth-child(1) {
    transition-delay: 50ms;
}

.navbar__mobile.open .navbar__mobile-link:nth-child(2) {
    transition-delay: 100ms;
}

.navbar__mobile.open .navbar__mobile-link:nth-child(3) {
    transition-delay: 150ms;
}

.navbar__mobile.open .navbar__mobile-link:nth-child(4) {
    transition-delay: 200ms;
}

.navbar__mobile.open .navbar__mobile-link:nth-child(5) {
    transition-delay: 250ms;
}

.navbar__mobile.open .navbar__mobile-link:nth-child(6) {
    transition-delay: 300ms;
}

.navbar__mobile-link:hover {
    color: var(--color-accent);
    background: rgba(255, 255, 255, 0.06);
}

.navbar__mobile-cta {
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    transform: translateY(8px);
    opacity: 0;
    transition: transform var(--duration-base) var(--ease-out),
        opacity var(--duration-base) var(--ease-out);
}

.navbar__mobile.open .navbar__mobile-cta {
    transform: translateY(0);
    opacity: 1;
    transition-delay: 350ms;
}

/* ── Responsive ── */
@media (max-width: 900px) {

    .navbar__nav,
    .navbar__cta {
        display: none;
    }

    .navbar__hamburger {
        display: flex;
    }

    .navbar__mobile {
        display: flex;
    }
}

@media (max-width: 640px) {
    .navbar {
        padding-block: 0.9rem;
    }

    .navbar__logo {
        font-size: 1.2rem;
    }

    .navbar__hamburger {
        padding: 0.5rem;
    }

    .navbar__mobile {
        top: 4.95rem;
        right: 0.75rem;
        left: 0.75rem;
        width: auto;
        max-height: min(26rem, calc(100vh - 5.75rem));
        padding: 0.85rem;
    }

    .navbar__mobile-link {
        font-size: 1rem;
        padding: 0.85rem 0.95rem;
    }

    .navbar__mobile-cta .btn {
        width: 100%;
        justify-content: center;
    }
}