/* ─── Base & Reset ─── */
*, *::before, *::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    font-family: 'Inter', system-ui, sans-serif;
    line-height: 1.6;
}

/* ─── Floating Card Animations ─── */
@keyframes float-slow {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-12px) rotate(1deg); }
}

@keyframes float-medium {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-8px) rotate(-1deg); }
}

@keyframes float-fast {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-16px) rotate(2deg); }
}

.floating-card-1 {
    animation: float-slow 5s ease-in-out infinite;
}

.floating-card-2 {
    animation: float-medium 4s ease-in-out infinite;
}

.floating-card-3 {
    animation: float-fast 6s ease-in-out infinite;
}

/* ─── Scroll Reveal (progressive enhancement) ─── */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 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; }
}

/* ─── Mobile Menu ─── */
#mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

#mobile-menu.open {
    max-height: 400px;
}

/* ─── Navbar Scroll State ─── */
.navbar-scrolled {
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
}

/* ─── Geometric Decorative Elements ─── */
.geo-shape {
    position: absolute;
    pointer-events: none;
}

/* ─── Custom Selection ─── */
::selection {
    background: rgba(13, 148, 136, 0.2);
    color: #0f172a;
}

/* ─── Form Focus Styles ─── */
input:focus, select:focus, textarea:focus {
    outline: none;
}

/* ─── Smooth Image Loading ─── */
img {
    display: block;
    max-width: 100%;
}

/* ─── Button Hover Glow ─── */
.btn-glow:hover {
    box-shadow: 0 0 30px rgba(13, 148, 136, 0.3);
}

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

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}