/* ── Base & Utilities ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; }

/* ── Scroll Reveal (progressive enhancement) ── */
@media (prefers-reduced-motion: no-preference) {
    .scroll-reveal {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .scroll-reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Navbar Links ── */
.nav-link {
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: width 0.3s ease;
}
.nav-link:hover::after {
    width: 100%;
}

/* ── Mobile Menu Bars ── */
#menu-toggle {
    position: relative;
}
.menu-bar {
    transition: transform 0.3s ease, opacity 0.3s ease;
}
#menu-toggle[aria-expanded="true"] #bar1 {
    transform: translateY(8px) rotate(45deg);
}
#menu-toggle[aria-expanded="true"] #bar2 {
    opacity: 0;
}
#menu-toggle[aria-expanded="true"] #bar3 {
    transform: translateY(-8px) rotate(-45deg);
}

/* ── Mobile Links ── */
.mobile-link {
    display: block;
    padding-left: 0.5rem;
    border-left: 2px solid transparent;
    transition: border-color 0.2s ease, padding-left 0.2s ease;
}
.mobile-link:hover {
    border-left-color: currentColor;
    padding-left: 1rem;
}

/* ── Scroll-to-top Button ── */
#scroll-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* ── Custom Scrollbar ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f0f3f9; }
::-webkit-scrollbar-thumb { background: #d5dcee; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #abb9dd; }

/* ── Selection ── */
::selection {
    background: #d4a017;
    color: #0a0e1f;
}