:root {
    /* Dark Mode Defaults */
    --neon-cyan: #00f2ff;
    --neon-purple: #bd00ff;
    --bg-dark: #050508;
    --bg-secondary: #0c0c12;
    --nav-bg: rgba(5, 5, 8, 0.9);
    --text-main: #e0e0e0;
    --text-dim: #888;
    --glass: rgba(255, 255, 255, 0.03);
    --terminal-head: #1a1a24;
}

/* Light Theme Overrides */
.light-theme {
    --neon-cyan: #0066cc; /* Darker blue for contrast on white */
    --neon-purple: #7700ff;
    --bg-dark: #f0f0f5;
    --bg-secondary: #ffffff;
    --nav-bg: rgba(240, 240, 245, 0.9);
    --text-main: #1a1a2e;
    --text-dim: #555;
    --glass: rgba(0, 0, 0, 0.05);
    --terminal-head: #d1d1d6;
}

* { box-sizing: border-box; margin: 0; padding: 0; scroll-behavior: smooth; }

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Courier New', Courier, monospace;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* SCANLINE */
.scanline {
    width: 100%; height: 100px; z-index: 9999;
    background: linear-gradient(0deg, transparent, rgba(0, 242, 255, 0.05), transparent);
    opacity: 0.1; position: fixed; bottom: 100%;
    animation: scanline 6s linear infinite; pointer-events: none;
}
@keyframes scanline { 0% { bottom: 100%; } 100% { bottom: -100%; } }

/* NAVBAR */
.navbar { 
    position: fixed; top: 0; width: 100%; 
    background: var(--nav-bg); 
    backdrop-filter: blur(10px); 
    z-index: 100; 
    border-bottom: 1px solid var(--neon-cyan); 
    transition: background 0.4s;
}
.nav-content { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; padding: 15px 20px; align-items: center; }
.nav-links { display: flex; list-style: none; gap: 20px; }
.nav-links a { text-decoration: none; color: var(--text-dim); font-size: 0.8rem; transition: 0.3s; }
.nav-links a:hover { color: var(--neon-cyan); text-shadow: 0 0 10px var(--neon-cyan); }

.neon-text { text-shadow: 0 0 10px var(--neon-cyan), 0 0 20px var(--neon-cyan); }
.neon-text-purple { text-shadow: 0 0 10px var(--neon-purple), 0 0 20px var(--neon-purple); }

.hero { padding: 200px 20px 100px; text-align: center; }
.hero h1 { font-size: 3.5rem; margin-bottom: 20px; }
.hero-text { color: var(--text-dim); max-width: 600px; margin: 0 auto 30px; }

.resume-btn { 
    padding: 12px 30px; 
    border: 1px solid var(--neon-cyan); 
    color: var(--neon-cyan); 
    text-decoration: none; 
    transition: 0.3s; 
}
.resume-btn:hover { background: var(--neon-cyan); color: white !important; box-shadow: 0 0 30px var(--neon-cyan); }

.theme-toggle {
    background: var(--glass);
    border: 1px solid var(--neon-cyan);
    color: var(--neon-cyan);
    padding: 8px; border-radius: 50%; cursor: pointer; font-size: 1.2rem;
}

/* PROJECT CARDS */
.project-card {
    background: var(--glass);
    padding: 30px;
    border: 1px solid rgba(0, 242, 255, 0.1);
    transition: 0.4s; margin-bottom: 20px;
}
.project-card:hover { border-color: var(--neon-cyan); transform: scale(1.02); }
.tech-stack { font-size: 0.8rem; color: var(--neon-purple); margin: 15px 0; }
.project-link { color: var(--neon-cyan); text-decoration: none; font-weight: bold; }

/* TERMINAL */
.terminal-window { 
    background: var(--bg-secondary); 
    border: 1px solid var(--text-dim); 
    border-radius: 5px; max-width: 800px; margin: 0 auto; overflow: hidden; 
}
.terminal-header { background: var(--terminal-head); padding: 8px 15px; display: flex; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 50%; }
.red { background: #ff5f56; } .yellow { background: #ffbd2e; } .green { background: #27c93f; }
.terminal-body { padding: 20px; color: #00ff41; min-height: 100px; }

/* In Light Mode, the terminal text needs to be darker for readability */
.light-theme .terminal-body { color: #111; }

/* SKILLS & CERTS */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); gap: 15px; }
.skill { background: var(--glass); padding: 20px; text-align: center; border: 1px solid transparent; transition: 0.3s; }
.skill:hover { border-color: var(--neon-purple); transform: translateY(-5px); }
.skill img { width: 40px; margin-bottom: 10px; filter: grayscale(1); transition: 0.3s; }
.skill:hover img { filter: grayscale(0); }

.cert-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.cert-item { background: var(--glass); padding: 15px; display: flex; justify-content: space-between; border-left: 2px solid var(--neon-purple); }
.cert-item a { color: var(--neon-cyan); text-decoration: none; font-size: 0.8rem; }

section { max-width: 1100px; margin: 0 auto; padding: 80px 20px; }
.socials img { width: 30px; filter: invert(1); margin: 0 15px; transition: 0.3s; }

/* In Light Mode, icons shouldn't be inverted white */
.light-theme .socials img { filter: invert(0); }

@media (max-width: 600px) {
    .cert-grid { grid-template-columns: 1fr; }
}