/* ===== Base & Utilities ===== */
*, *::before, *::after {
    box-sizing: border-box;
}

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

body {
    overflow-x: hidden;
}

::selection {
    background: rgba(107, 191, 166, 0.3);
    color: #050E1E;
}

/* ===== Scroll Reveal (progressive enhancement) ===== */
@media (prefers-reduced-motion: no-preference) {
    .reveal-up {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    .reveal-up.revealed {
        opacity: 1;
        transform: translateY(0);
    }

    /* Stagger children */
    .reveal-up.stagger > * {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    .reveal-up.stagger.revealed > *:nth-child(1) { transition-delay: 0.05s; opacity: 1; transform: translateY(0); }
    .reveal-up.stagger.revealed > *:nth-child(2) { transition-delay: 0.12s; opacity: 1; transform: translateY(0); }
    .reveal-up.stagger.revealed > *:nth-child(3) { transition-delay: 0.19s; opacity: 1; transform: translateY(0); }
    .reveal-up.stagger.revealed > *:nth-child(4) { transition-delay: 0.26s; opacity: 1; transform: translateY(0); }
}

/* For users who prefer reduced motion, ensure content is always visible */
@media (prefers-reduced-motion: reduce) {
    .reveal-up {
        opacity: 1;
        transform: none;
    }
}

/* ===== Scroll Line Animation ===== */
@keyframes scrollLine {
    0% { top: -16px; opacity: 0; }
    20% { opacity: 1; }
    80% { opacity: 1; }
    100% { top: 40px; opacity: 0; }
}

.animate-scroll-line {
    animation: scrollLine 1.8s ease-in-out infinite;
}

/* ===== Navbar Transition ===== */
.nav-scrolled {
    background: rgba(5, 14, 30, 0.95) !important;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(168, 221, 214, 0.08);
}

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

/* ===== Mobile Menu ===== */
.mobile-menu-open {
    opacity: 1 !important;
    pointer-events: all !important;
}

.mobile-link {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.4s ease, transform 0.4s ease, color 0.3s ease;
}

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

.mobile-menu-open .mobile-link:nth-child(1) { transition-delay: 0.05s; }
.mobile-menu-open .mobile-link:nth-child(2) { transition-delay: 0.1s; }
.mobile-menu-open .mobile-link:nth-child(3) { transition-delay: 0.15s; }
.mobile-menu-open .mobile-link:nth-child(4) { transition-delay: 0.2s; }
.mobile-menu-open .mobile-link:nth-child(5) { transition-delay: 0.25s; }

/* ===== Hamburger Animation ===== */
.menu-active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}

.menu-active span:nth-child(2) {
    opacity: 0;
}

.menu-active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
    width: 6px;
}

/* ===== Smooth Image Loading ===== */
img {
    opacity: 1;
    transition: opacity 0.3s ease;
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #050E1E;
}

::-webkit-scrollbar-thumb {
    background: rgba(107, 191, 166, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(107, 191, 166, 0.5);
}

/* ===== Focus Styles ===== */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
    outline: 2px solid #6BBFA6;
    outline-offset: 2px;
}

/* ===== Hover Underline Animation ===== */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 1px;
    background: #A8DDD6;
    transition: width 0.3s ease, left 0.3s ease;
}

.nav-link:hover::after {
    width: 80%;
    left: 10%;
}

.nav-link {
    position: relative;
}

/* ===== Card Hover Effects ===== */
.group:hover .group-hover\:scale-110 {
    transform: scale(1.1);
}

/* ===== Form Styles ===== */
input::placeholder, textarea::placeholder {
    color: rgba(5, 14, 30, 0.15);
}

input:focus, textarea:focus {
    border-color: #6BBFA6 !important;
    box-shadow: 0 0 0 4px rgba(107, 191, 166, 0.1) !important;
}

/* ===== Responsive Tweaks ===== */
@media (max-width: 767px) {
    .nav-link {
        display: block;
        padding: 0.5rem 0;
    }

    .nav-link::after {
        display: none;
    }
}