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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
}

::selection {
    background-color: rgba(20, 184, 166, 0.3);
    color: #f1f5f9;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #060c18;
}

::-webkit-scrollbar-thumb {
    background: #1e293b;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #334155;
}

/* Loader */
#page-loader {
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#page-loader.fade-out {
    opacity: 0;
    visibility: hidden;
}

/* Header */
#main-header.scrolled {
    background: rgba(6, 12, 24, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(20, 184, 166, 0.08);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

#main-header.scrolled #main-header {
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
}

/* Mobile menu */
#mobile-menu.open {
    opacity: 1;
    pointer-events: all;
}

#mobile-menu.close {
    opacity: 0;
    pointer-events: none;
}

.menu-line:nth-child(3) {
    width: 1.375rem;
}

#mobile-toggle.active .menu-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

#mobile-toggle.active .menu-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

#mobile-toggle.active .menu-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
    width: 1.25rem;
}

.mobile-link {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

#mobile-menu.open .mobile-link {
    opacity: 1;
    transform: translateY(0);
}

#mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.1s; }
#mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.15s; }
#mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.2s; }
#mobile-menu.open .mobile-link:nth-child(4) { transition-delay: 0.25s; }
#mobile-menu.open .mobile-link:nth-child(5) { transition-delay: 0.3s; }
#mobile-menu.open .mobile-link:nth-child(6) { transition-delay: 0.35s; }

/* Floating cards */
.floating-card {
    animation: float 6s ease-in-out infinite;
}

.floating-card-delayed {
    animation: float 6s ease-in-out infinite;
    animation-delay: 2s;
}

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

/* Scroll reveal */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

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

/* Scroll to top */
#scroll-top.visible {
    opacity: 1;
    pointer-events: all;
}

/* Contact form select */
select option {
    background: #1e293b;
    color: #f1f5f9;
}