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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    overflow-x: hidden;
}

::selection {
    background: #99f6e4;
    color: #134e4a;
}

/* ─── Floating Card Animations ─── */
.floating-card-1 {
    animation: float-slow 6s ease-in-out infinite;
}

.floating-card-2 {
    animation: float-medium 5s ease-in-out infinite 0.5s;
}

.floating-card-3 {
    animation: float-slow 7s ease-in-out infinite 1s;
}

.floating-card-4 {
    animation: float-medium 5.5s ease-in-out infinite 0.3s;
}

@keyframes float-slow {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-12px); }
}

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

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

    .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; }
}

/* ─── Navbar scroll state ─── */
#navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
}

/* ─── Smooth image loading ─── */
img {
    image-rendering: auto;
}

/* ─── Focus styles ─── */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid #14b8a6;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ─── Mobile menu transition ─── */
#mobile-menu {
    animation: slideDown 0.3s ease;
}

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

/* ─── Responsive adjustments ─── */
@media (max-width: 640px) {
    .floating-card-1,
    .floating-card-2,
    .floating-card-3,
    .floating-card-4 {
        display: none;
    }

    .hero-card-main {
        width: 100% !important;
        max-width: 280px;
        margin: 0 auto;
    }
}