/* ===== Base & Utilities ===== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

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

/* Focus styles */
:focus-visible {
    outline: 2px solid #0d9488;
    outline-offset: 2px;
}

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

/* ===== Scroll Reveal (progressive enhancement) ===== */
.reveal {
    opacity: 1;
    transform: none;
    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: none;
}

/* Only apply hidden state when JS is enabled and user prefers motion */
.js-enabled :where(.reveal) {
    opacity: 0;
    transform: translateY(30px);
}

@media (prefers-reduced-motion: no-preference) {
    .js-enabled :where(.reveal) {
        opacity: 0;
        transform: translateY(30px);
    }
    .js-enabled :where(.reveal.revealed) {
        opacity: 1;
        transform: none;
    }
}

/* Staggered delays */
.js-enabled :where(.reveal-delay-1) { transition-delay: 0.1s; }
.js-enabled :where(.reveal-delay-2) { transition-delay: 0.2s; }
.js-enabled :where(.reveal-delay-3) { transition-delay: 0.3s; }
.js-enabled :where(.reveal-delay-4) { transition-delay: 0.4s; }

/* ===== Header shadow on scroll ===== */
#site-header.scrolled {
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
}

/* ===== Nav link underline animation ===== */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: #0d9488;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 60%;
}

/* ===== Button ripple effect ===== */
button, a {
    -webkit-tap-highlight-color: transparent;
}

/* ===== Image loading placeholder ===== */
img {
    background-color: #f1f5f9;
}

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

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

/* ===== Back to top button ===== */
#back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
}

#back-to-top {
    transform: translateY(10px);
}

/* ===== Card hover lift ===== */
.group:hover .group-hover\:scale-105 {
    transform: scale(1.05);
}

/* ===== Smooth section transitions ===== */
section {
    position: relative;
}

/* ===== Print styles ===== */
@media print {
    #site-header, #back-to-top, .reveal {
        display: none !important;
    }
    body {
        color: #000;
        background: #fff;
    }
}