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

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background-color: rgba(13, 148, 136, 0.2);
    color: #0f766e;
}

/* === Navbar === */
.nav-scrolled {
    background: rgba(255, 255, 255, 0.92) !important;
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
}

.nav-logo-text {
    color: #1e293b;
}

/* === Floating Cards Animation === */
.floating-card {
    animation: float 4s ease-in-out infinite;
}

.floating-card:nth-child(2) {
    animation-delay: -1s;
}

.floating-card:nth-child(3) {
    animation-delay: -2s;
}

.floating-card:nth-child(4) {
    animation-delay: -3s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* === Scroll Dot Animation === */
@keyframes scroll-dot {
    0% { top: -12px; opacity: 1; }
    100% { top: 20px; opacity: 0; }
}

.animate-scroll-dot {
    animation: scroll-dot 1.5s ease-in-out infinite;
}

/* === Menu Tabs === */
.menu-tab {
    background: transparent;
    color: #64748b;
    border: none;
    cursor: pointer;
}

.menu-tab.active {
    background: white;
    color: #0d9488;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* === Mobile Menu === */
.mobile-link {
    display: block;
}

/* === Scroll Reveal (progressive enhancement) === */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
        transition: opacity 0.6s ease, transform 0.6s 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; }
}

/* === Responsive === */
@media (max-width: 768px) {
    .floating-card {
        display: none;
    }
}

/* === Focus styles === */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible {
    outline: 2px solid #0d9488;
    outline-offset: 2px;
}