/* ===== CUSTOM STYLES ===== */

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Prevent FOUC on navbar */
body {
    opacity: 1;
}

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

#navbar.scrolled {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
}

#navbar.scrolled #nav-logo-text {
    color: #0f172a;
}

#navbar.scrolled .nav-link {
    color: #475569;
}

/* ===== MOBILE MENU ===== */
#mobile-menu {
    animation: slideDown 0.3s ease;
}

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

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

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

/* ===== SCROLL REVEAL ===== */
/* Default state: visible (progressive enhancement) */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

/* Only animate if user prefers motion and JS runs */
@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; }
}

/* ===== BUTTON HOVER EFFECTS ===== */
a, button {
    -webkit-tap-highlight-color: transparent;
}

/* ===== IMAGE LAZY LOAD FALLBACK ===== */
img {
    max-width: 100%;
    height: auto;
}

/* ===== SELECTION COLOR ===== */
::selection {
    background: rgba(13, 148, 136, 0.2);
    color: #0f172a;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}

/* ===== FOCUS STYLES ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid #0d9488;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ===== RESPONSIVE TWEAKS ===== */
@media (max-width: 640px) {
    .font-serif {
        line-height: 1.05;
    }
}