/* Base & Utilities */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

/* Selection */
::selection {
    background-color: rgba(13, 148, 136, 0.15);
    color: #0f766e;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f8fafc;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Fade-in animations */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* Navbar scroll state */
.navbar-scrolled {
    background-color: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06), 0 4px 24px rgba(0, 0, 0, 0.04);
}

/* Mobile menu animation */
#mobileMenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
    opacity: 0;
}

#mobileMenu.open {
    max-height: 400px;
    opacity: 1;
}

/* Mobile link transition */
.mobile-link {
    display: block;
    padding: 0.5rem 0;
    border-radius: 0.5rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.mobile-link:hover {
    background-color: rgba(13, 148, 136, 0.06);
    color: #0d9488;
}

/* Hover lift for cards */
.hover-lift {
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-4px);
}

/* Pulse dot */
@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.2); }
}

/* Gradient text utility */
.gradient-text {
    background: linear-gradient(135deg, #0d9488, #14b8a6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Focus visible */
*:focus-visible {
    outline: 2px solid #0d9488;
    outline-offset: 2px;
    border-radius: 0.25rem;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .fade-in { opacity: 1; transform: none; transition: none; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* Tablet */
@media (max-width: 767px) {
    .font-serif {
        font-size: 2rem;
        line-height: 1.2;
    }
}

/* Large desktop */
@media (min-width: 1280px) {
    .hero-title {
        font-size: 4.5rem;
    }
}