* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}


:root {
    --bg-color: #0a0a0a;
    --text-color: #ffffff;
    --accent-border: #262626;
    --hover-bg: #171717;
    --dim-text: #a3a3a3;
}

body.light-theme {
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-border: #e5e5e5;
    --hover-bg: #f5f5f5;
    --dim-text: #737373;
}


body.matrix-theme {
    --bg-color: #050d06;
    --text-color: #00ff66;
    --accent-border: #003311;
    --hover-bg: #0a220a;
    --dim-text: #00aa44;
}


body.cyber-theme {
    --bg-color: #120417;
    --text-color: #00ffff;
    --accent-border: #ff00ff;
    --hover-bg: #2d0b3d;
    --dim-text: #ba00ba;
}


body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
* CUSTOM MONOCHROME SCROLLBAR */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: #404040;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #737373;
}


.topbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 56px;
    background-color: var(--bg-color);   
    border-bottom: 1px solid var(--accent-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 1000;
}


.logo {
    font-weight: 700;
    letter-spacing: -0.05em;
    text-transform: uppercase;
    font-size: 1.1rem;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--dim-text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s, background-color 0.2s;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-color);
    background-color: var(--hover-bg);
}
main {
    margin-top: 56px;
    padding: 3rem 2rem;
    flex-grow: 1;
    display: flex;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 800px;
    animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}


h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

p {
    color: var(--dim-text);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.card {
    border: 1px solid var(--accent-border);
    border-radius: 6px;
    padding: 1.25rem;
    background: transparent;
    transition: border-color 0.2s;
}

.card:hover {
    border-color: #525252;
}

.card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}


footer {
    padding: 2rem;
    text-align: center;
    font-size: 0.8rem;
    color: #404040;
    border-top: 1px solid var(--accent-border);
    margin-top: auto;
}