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

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

body {
    margin: 0;
    overflow-x: hidden;
}

::selection {
    background: rgba(168, 237, 234, 0.25);
    color: #fff;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #0a0f1e;
}
::-webkit-scrollbar-thumb {
    background: #1a2d45;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #2a3f55;
}

/* ===== Navbar ===== */
#nav.scrolled {
    background: rgba(10, 15, 30, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

/* ===== 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(168, 237, 234, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

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

/* ===== Feature cards ===== */
.feature-card {
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 0.75rem;
    background: radial-gradient(circle at 50% 0%, rgba(168, 237, 234, 0.04), transparent 70%);
    opacity: 0;
    transition: opacity 0.3s;
}

.feature-card:hover::after {
    opacity: 1;
}

/* ===== Form inputs ===== */
input:focus,
select:focus,
textarea:focus {
    outline: none;
}

input::placeholder,
textarea::placeholder {
    color: #4a5568;
}

select {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a8edea' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

/* ===== Scroll reveal (progressive enhancement) ===== */
@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 0;
        transform: translateY(24px);
        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: 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; }
}

/* ===== Mobile menu animation ===== */
#mobile-menu {
    animation: slideDown 0.25s ease-out;
}

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

/* ===== Pulse dot ===== */
@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.animate-pulse {
    animation: pulse-dot 2s ease-in-out infinite;
}