/* ===== Base & Typography ===== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'DM Sans', system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
    color: #1A4A94;
}

h1, h2, h3, h4 {
    font-family: 'Playfair Display', Georgia, serif;
}

/* ===== Header Scroll State ===== */
#site-header {
    background: transparent;
}

#site-header.scrolled {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 20px rgba(10, 46, 92, 0.08);
}

/* ===== Nav Link Hover ===== */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: #10CD91;
    border-radius: 1px;
    transition: all 0.25s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 60%;
}

/* ===== Mobile Menu ===== */
#mobile-menu {
    animation: slideDown 0.25s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Floating Animation ===== */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.animate-float {
    animation: float 3.5s ease-in-out infinite;
}

/* ===== Scroll Reveal ===== */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Default state for reduced motion or no-JS */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
    }

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

/* Stagger children */
.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; }

/* ===== Focus Styles ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid #10CD91;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ===== Form Validation ===== */
input:invalid:not(:placeholder-shown):not(:focus),
textarea:invalid:not(:placeholder-shown):not(:focus) {
    border-color: #f87171;
}

/* ===== Selection ===== */
::selection {
    background: #D0F5E9;
    color: #0A2E5C;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #F0F4FA;
}
::-webkit-scrollbar-thumb {
    background: #ABC0E0;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #81A1D0;
}