/* ─── Custom Base ─── */
html {
    scroll-behavior: smooth;
}

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

/* ─── Hero Gradient ─── */
.hero-gradient {
    background: linear-gradient(
        135deg,
        #042f2e 0%,
        #134e4a 20%,
        #0f172a 50%,
        #1e293b 75%,
        #0f172a 100%
    );
}

/* ─── Subtle Pattern Overlay ─── */
.hero-pattern {
    background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,0.15) 1px, transparent 0);
    background-size: 40px 40px;
}

/* ─── Hero Glow Orbs ─── */
.hero-glow {
    background: radial-gradient(circle, rgba(45, 212, 191, 0.4) 0%, transparent 70%);
}

/* ─── Scroll Indicator Animation ─── */
@keyframes scrollDown {
    0% { transform: translateY(-100%); opacity: 0; }
    50% { opacity: 1; }
    100% { transform: translateY(400%); opacity: 0; }
}

.scroll-line {
    animation: scrollDown 1.6s ease-in-out infinite;
}

/* ─── Scroll Reveal Base (progressive enhancement) ─── */
@media (prefers-reduced-motion: no-preference) {
    .reveal-up {
        opacity: 0;
        transform: translateY(32px);
        transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
                    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }

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

    .reveal-left {
        opacity: 0;
        transform: translateX(-40px);
        transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
                    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }

    .reveal-left.revealed {
        opacity: 1;
        transform: translateX(0);
    }

    .reveal-right {
        opacity: 0;
        transform: translateX(40px);
        transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
                    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }

    .reveal-right.revealed {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Always visible fallback for reduced-motion or no-JS */
@media (prefers-reduced-motion: reduce) {
    .reveal-up,
    .reveal-left,
    .reveal-right {
        opacity: 1;
        transform: none;
    }
}

/* ─── Navbar Transition ─── */
#navbar.scrolled {
    background: rgba(2, 6, 23, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}

#navbar.scrolled .nav-link {
    color: rgba(255, 255, 255, 0.85);
}

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

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

/* ─── Form Focus Styles ─── */
input:focus,
textarea:focus {
    outline: none;
}

/* ─── Selection Color ─── */
::selection {
    background: rgba(20, 184, 166, 0.25);
    color: #134e4a;
}

/* ─── Image Loading ─── */
img {
    display: block;
    max-width: 100%;
}

/* ─── Smooth Scroll Offset for Fixed Nav ─── */
section[id] {
    scroll-margin-top: 80px;
}