*, *::before, *::after { box-sizing: border-box; }

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

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

/* Scroll reveal base — content is visible by default */
.reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.7s ease, transform 0.7s ease;
}

@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(30px);
    }
    .reveal.visible {
        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; }
}

/* Header scroll state */
#site-header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
}

/* Mobile menu */
.mobile-sheet.translate-x-full { transform: translateX(100%); }
.mobile-sheet.open { transform: translateX(0); }

#mobile-menu.menu-open {
    pointer-events: auto;
    opacity: 1;
}

/* Hamburger animation */
#menu-btn[aria-expanded="true"] .menu-line:nth-child(1) {
    transform: rotate(45deg);
    top: 1/2;
}
#menu-btn[aria-expanded="true"] .menu-line:nth-child(2) {
    opacity: 0;
}
#menu-btn[aria-expanded="true"] .menu-line:nth-child(3) {
    transform: rotate(-45deg);
    bottom: 1/2;
}

/* Scroll to top button */
#scroll-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* Gallery hover */
.gallery-item img {
    transition: transform 0.5s ease;
}

/* Service card hover glow */
.service-card:hover {
    border-color: rgba(13, 148, 136, 0.3);
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f5f5f4; }
::-webkit-scrollbar-thumb { background: #94a3b8; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #64748b; }

/* Selection color */
::selection {
    background: rgba(13, 148, 136, 0.2);
    color: #134e4a;
}