/* ========== BASE ========== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    margin: 0;
    overflow-x: hidden;
}

::selection {
    background: rgba(20, 184, 166, 0.2);
    color: #0d3b4e;
}

/* ========== HERO ANIMATIONS ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.animate-fade-in-up {
    animation: fadeInUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.animate-fade-in {
    animation: fadeIn 1s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* ========== SCROLL REVEAL ========== */
/* Default: content is visible (no JS progressive enhancement) */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

/* When JS adds .revealed, trigger the slide-up */
.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Reduced motion: never animate */
@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .animate-fade-in-up,
    .animate-fade-in {
        animation: none;
        opacity: 1;
    }
    html {
        scroll-behavior: auto;
    }
}

/* ========== NAVBAR ========== */
#navbar {
    background: transparent;
}

#navbar.scrolled {
    background: rgba(5, 28, 38, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

#navbar.scrolled .nav-link {
    color: rgba(255, 255, 255, 0.85);
}

/* ========== MOBILE MENU ========== */
#mobile-menu.open {
    opacity: 1;
    pointer-events: all;
}

#mobile-menu.open .mobile-link {
    animation: fadeInUp 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}

#mobile-menu.open .mobile-link:nth-child(1) { animation-delay: 0.05s; }
#mobile-menu.open .mobile-link:nth-child(2) { animation-delay: 0.1s; }
#mobile-menu.open .mobile-link:nth-child(3) { animation-delay: 0.15s; }
#mobile-menu.open .mobile-link:nth-child(4) { animation-delay: 0.2s; }

/* Hamburger animation */
#menu-btn[aria-expanded="true"] .menu-line:nth-child(1) {
    transform: translateY(5px) rotate(45deg);
}

#menu-btn[aria-expanded="true"] .menu-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

#menu-btn[aria-expanded="true"] .menu-line:nth-child(3) {
    width: 1.5rem;
    transform: translateY(-5px) rotate(-45deg);
}

/* ========== UTILITY ========== */
@media (max-width: 767px) {
    .reveal {
        opacity: 1;
        transform: translateY(0);
    }
}