.navbar {
    width: 100%;
    padding: 14px 26px;
    position: sticky;
    top: 0;
    z-index: 999;
    display: flex;
    justify-content: space-between;
    /* LEFT + RIGHT */
    align-items: center;
    backdrop-filter: blur(14px);
    background: rgba(255, 255, 255, 0.04);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}


/* left logo */

.nav-left .logo {
    font-size: 22px;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    color: transparent;
    letter-spacing: 0.5px;
}


/* right items */

.nav-right {
    display: flex;
    align-items: center;
    gap: 26px;
}


/* each link */

.nav-right a {
    font-size: 16px;
    text-decoration: none;
    color: var(--text);
    transition: 0.25s ease;
    padding: 6px 2px;
    position: relative;
}


/* hover neon glow underline */

.nav-right a:hover {
    color: var(--accent);
    text-shadow: 0 0 12px rgba(0, 209, 255, 0.6);
}


/* animated underline */

.nav-right a::after {
    content: "";
    position: absolute;
    bottom: -4px;
    left: 0;
    height: 2px;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transition: width 0.25s ease;
    border-radius: 2px;
}

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


/* LOGIN button (Special) */

.nav-right .login-btn {
    padding: 8px 16px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    color: #021022 !important;
    border-radius: 10px;
    font-weight: 600;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
    transition: 0.25s ease;
}

.nav-right .login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
}


/* mobile layout */

@media (max-width:800px) {
    .navbar {
        padding: 12px 18px;
    }
    .nav-right {
        gap: 18px;
    }
    .nav-left .logo {
        font-size: 20px;
    }
}


/* THEME VARIABLES (fast) */

:root {
    --bg: #0f1724;
    /* page background (light fallback uses body.bg override) */
    --card-bg: rgba(255, 255, 255, 0.06);
    --card-surface: rgba(255, 255, 255, 0.03);
    --text: #e6eef8;
    --muted: #9aa8bf;
    --accent: #6ee7ff;
    --accent-2: #7c5cff;
    --neon: #00d1ff;
    --glass-border: rgba(255, 255, 255, 0.06);
}


/* Light-mode overrides (if you keep light mode) */

body {
    background: linear-gradient(180deg, #f6f8fb 0%, #eef2f7 100%);
    color: #111827;
    --card-bg: rgba(255, 255, 255, 0.85);
    --card-surface: rgba(255, 255, 255, 0.9);
    --text: #111827;
    --muted: #666c78;
    --accent: #007bff;
    --accent-2: #8b5cf6;
    --neon: #007bff;
}


/* Premium Dark-mode (toggle sets body.dark) */

body.dark {
    background: radial-gradient(1200px 600px at 10% 10%, rgba(124, 92, 255, 0.08), transparent 10%), radial-gradient(900px 450px at 90% 90%, rgba(0, 209, 255, 0.04), transparent 10%), var(--bg);
    color: var(--text);
}


/* layout helpers for performance */

#particles-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.85;
    mix-blend-mode: screen;
    will-change: transform;
}


/* keep content above particles */

nav.navbar,
header,
main.grid {
    position: relative;
    z-index: 2;
}


/* Grid tweaks (reuse your existing .grid) */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 22px;
    max-width: 1250px;
    margin: 28px auto;
    padding: 0 18px 60px;
}


/* GLASS + GRADIENT BORDER + NEON SHADOW */

.card {
    position: relative;
    padding: 22px;
    border-radius: 14px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
    border: 1px solid var(--glass-border);
    color: var(--text);
    overflow: hidden;
    transform-style: preserve-3d;
    /* for 3D tilt */
    will-change: transform;
    transition: transform 280ms cubic-bezier(.2, .9, .3, 1), box-shadow 280ms, border-color 280ms;
    min-height: 110px;
    box-shadow: 0 6px 18px rgba(2, 6, 23, 0.32);
}


/* subtle glass inner surface layer */

.card::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 14px;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.015), rgba(255, 255, 255, 0.01));
    transform: translateZ(-1px);
    mix-blend-mode: overlay;
}


/* gradient border effect (fast, using pseudo element) */

.card::after {
    content: "";
    position: absolute;
    inset: -2px;
    border-radius: 16px;
    padding: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    pointer-events: none;
    transition: opacity 260ms ease, transform 260ms ease;
}


/* show gradient border on hover (fades in) */

.card.hover-glow::after {
    opacity: 1;
    transform: scale(1.02);
}


/* neon shadow on hover (fast, no blur heavy spreads) */

.card.hover-glow {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.45), 0 0 32px rgba(0, 209, 255, 0.08);
    border-color: rgba(0, 209, 255, 0.08);
}


/* accent dot (decorative, lightweight) */

.card .accent-dot {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: linear-gradient(180deg, var(--accent), var(--accent-2));
    box-shadow: 0 0 10px rgba(124, 92, 255, 0.3);
    transform: translateZ(20px);
    pointer-events: none;
}


/* SHIMMER (fast) */

.card .shimmer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(120deg, transparent 0%, rgba(255, 255, 255, 0.06) 45%, rgba(255, 255, 255, 0.02) 60%, transparent 100%);
    transform: translateX(-130%) skewX(-12deg);
    opacity: 0;
    transition: opacity 220ms;
}

.card.hover-glow .shimmer {
    animation: shimmer 900ms linear forwards;
    opacity: 1;
}

@keyframes shimmer {
    to {
        transform: translateX(130%) skewX(-12deg);
    }
}


/* CONTENT STYLES (titles / text / arrow) */

.card h3 {
    font-size: 18px;
    margin-bottom: 8px;
    letter-spacing: 0.2px;
}

.card p {
    color: var(--muted);
    font-size: 14px;
    line-height: 1.28;
}


/* round arrow */

.round-arrow,
.around-arrow {
    position: absolute;
    bottom: 16px;
    right: 16px;
    padding: 9px 12px;
    border-radius: 999px;
    background: linear-gradient(180deg, var(--accent), var(--accent-2));
    color: #021022;
    font-weight: 700;
    text-decoration: none;
    transform: translateZ(40px);
    transition: transform 220ms ease, box-shadow 220ms;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.round-arrow:hover {
    transform: translateZ(44px) scale(1.06);
    box-shadow: 0 10px 30px rgba(0, 209, 255, 0.12);
}


/* TOUCH-FRIENDLY (mobile) */

@media (max-width:800px) {
    .card {
        transition: transform 160ms ease;
    }
    .round-arrow {
        padding: 8px 10px;
        font-size: 16px;
    }
}


/* small helper to ensure cards don't overflow 3D */

.card * {
    transform-style: preserve-3d;
}