/* ===== Base & Typography ===== */
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
}

::selection {
    background: rgba(110, 231, 183, 0.3);
    color: #f0f3fa;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #0d1225;
}
::-webkit-scrollbar-thumb {
    background: #283569;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #394d9f;
}

/* ===== Navbar ===== */
#navbar {
    background: transparent;
    transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}

#navbar.scrolled {
    background: rgba(13, 18, 37, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(110, 231, 183, 0.1);
}

/* ===== Mobile Menu ===== */
.mobile-link {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

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

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

/* ===== Mobile menu button animation ===== */
#mobileMenuBtn.active .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}
#mobileMenuBtn.active .menu-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
#mobileMenuBtn.active .menu-line:nth-child(3) {
    width: 24px;
    transform: rotate(-45deg) translate(4px, -4px);
}

/* ===== Program Cards ===== */
.program-card {
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.program-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(110, 231, 183, 0.15);
}

/* ===== Scroll Reveal Animations ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(30px);
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* ===== Focus Styles ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid #6ee7b7;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ===== Select arrow ===== */
select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236ee7b7' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

/* ===== Print ===== */
@media print {
    nav, #mobileMenuBtn, .reveal {
        display: none !important;
    }
    body {
        background: white;
        color: black;
    }
}