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

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    font-weight: 300;
    overflow-x: hidden;
}

::selection {
    background: rgba(134, 239, 172, 0.25);
    color: #0f1d36;
}

/* ── Loader ── */
#page-loader {
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

#page-loader.loaded {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* ── Navbar ── */
#navbar {
    transition: background-color 0.4s ease, backdrop-filter 0.4s ease, padding 0.4s ease;
}

#navbar.scrolled {
    background-color: rgba(10, 22, 40, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
}

.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: rgba(134, 239, 172, 0.6);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link:hover {
    color: #ffffff !important;
}

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

#mobile-menu.open .mobile-link {
    animation: fadeUp 0.4s ease forwards;
    opacity: 1;
}

.mobile-link {
    opacity: 0;
    transform: translateY(12px);
}

.mobile-link:nth-child(1) { animation-delay: 0.05s; }
.mobile-link:nth-child(2) { animation-delay: 0.1s; }
.mobile-link:nth-child(3) { animation-delay: 0.15s; }
.mobile-link:nth-child(4) { animation-delay: 0.2s; }

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Mobile Toggle ── */
#mobile-toggle.active .mobile-line:nth-child(1) {
    transform: rotate(45deg) translate(3px, 3px);
}

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

#mobile-toggle.active .mobile-line:nth-child(3) {
    width: 1.5rem;
    transform: rotate(-45deg) translate(3px, -3px);
}

/* ── Service Cards ── */
.service-card {
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(134, 239, 172, 0.15), transparent);
    opacity: 0;
    transition: opacity 0.5s ease;
}

.service-card:hover::before {
    opacity: 1;
}

/* ── Scroll Reveal ── */
.reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal[data-reveal] {
    opacity: 0;
    transform: translateY(24px);
}

@media (prefers-reduced-motion: no-preference) {
    .reveal[data-reveal] {
        opacity: 0;
        transform: translateY(24px);
    }
    
    .reveal.visible[data-reveal] {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (prefers-reduced-motion: reduce) {
    .reveal[data-reveal] {
        opacity: 1;
        transform: none;
    }
}

/* ── Form ── */
#contact-form input:focus,
#contact-form textarea:focus {
    border-color: rgba(134, 239, 172, 0.5) !important;
}

#contact-form input::placeholder,
#contact-form textarea::placeholder {
    color: rgba(255, 255, 255, 0.18);
}

/* ── Utility ── */
.no-scroll {
    overflow: hidden;
}

/* ── Responsive tweaks ── */
@media (max-width: 767px) {
    .font-serif {
        font-size: clamp(2.25rem, 8vw, 3.5rem);
    }
}