/* --- Global Variables & Reset --- */
:root {
    --color-bg-main: #121212;   /* Dark background */
    --color-bg-secondary: #1e1e1e; /* Slightly lighter panel bg */
    --color-text-primary: #ffffff;
    --color-text-secondary: #b3b3b3;
    --color-blue-accent: #007BFF; /* Electric Blue */
    --color-green-accent: #39FF14; /* Neon Green for success */
    --color-red-accent: #FF073A;   /* Neon Red for errors */
    
    --font-tech: 'Fira Code', monospace;
    --font-flow: 'Montserrat', sans-serif;
}

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

body {
    font-family: var(--font-flow);
    background-color: var(--color-bg-main);
    color: var(--color-text-primary);
    line-height: 1.6;
}

/* --- Typography & Utilities --- */
h1, h2, h3 {
    font-weight: 700;
}

.highlight {
    color: var(--color-blue-accent);
}

.tech-icon, .sim-icon {
    margin-right: 10px;
}

/* --- Buttons --- */
button {
    cursor: pointer;
    border: none;
    font-family: var(--font-flow);
    font-weight: 700;
    transition: all 0.3s ease;
}

.btn-login {
    background: transparent;
    color: var(--color-blue-accent);
    border: 2px solid var(--color-blue-accent);
    padding: 8px 20px;
    border-radius: 4px;
}

.btn-login:hover {
    background: var(--color-blue-accent);
    color: white;
}

.btn-primary {
    background: var(--color-blue-accent);
    color: white;
    padding: 15px 35px;
    font-size: 1.1rem;
    border-radius: 30px;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.4);
}

.btn-primary:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

/* --- Navbar --- */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background-color: rgba(18, 18, 18, 0.95);
    border-bottom: 1px solid #333;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
}

.logo-tech {
    font-family: var(--font-tech);
    font-weight: 700;
    color: white;
}

.logo-shift {
    font-family: var(--font-flow);
    font-weight: 400;
    font-style: italic;
    color: var(--color-blue-accent);
}

.logo-icon {
    margin-left: 5px;
    color: var(--color-blue-accent);
    font-size: 1.2rem;
}

.nav-links {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--color-blue-accent);
}

/* --- Hero Section --- */
.hero {
    padding: 100px 5%;
    text-align: center;
    background: radial-gradient(circle at center, #1a1a1a 0%, #121212 100%);
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero p {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto 40px auto;
}

/* --- Split Container (The Core Feature) --- */
.split-container {
    display: flex;
    height: calc(100vh - 80px); /* Full height minus nav */
    border-top: 1px solid #333;
}

/* Left Panel - Content */
.left-panel {
    flex: 1;
    background-color: var(--color-bg-main);
    padding: 40px;
    overflow-y: auto;
    border-right: 1px solid #333;
}

.content-box h2 {
    margin-bottom: 20px;
    color: var(--color-blue-accent);
    display: flex;
    align-items: center;
}

.content-box p {
    margin-bottom: 25px;
    color: var(--color-text-secondary);
}

.code-block {
    background-color: #000;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #333;
    font-family: var(--font-tech);
    font-size: 0.9rem;
    color: var(--color-green-accent);
    overflow-x: auto;
    margin-bottom: 25px;
}

.instruction {
    background-color: #1a1a2e;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--color-blue-accent);
}

.control-panel {
    margin-top: 20px;
    display: flex;
    gap: 15px;
}

.btn-run {
    padding: 12px 24px;
    border-radius: 4px;
    font-family: var(--font-tech);
    text-transform: uppercase;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
}

.btn-danger {
    background-color: rgba(255, 7, 58, 0.2);
    color: var(--color-red-accent);
    border: 1px solid var(--color-red-accent);
}

.btn-danger:hover {
    background-color: var(--color-red-accent);
    color: black;
}

.btn-fix {
    background-color: rgba(57, 255, 20, 0.2);
    color: var(--color-green-accent);
    border: 1px solid var(--color-green-accent);
}

.btn-fix:hover {
    background-color: var(--color-green-accent);
    color: black;
}

/* Right Panel - Simulation */
.right-panel {
    flex: 1;
    background-color: var(--color-bg-secondary);
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background-image: 
        linear-gradient(rgba(18, 18, 18, 0.9), rgba(18, 18, 18, 0.9)),
        url('data:image/svg+xml;utf8,<svg width="40" height="40" viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg"><rect x="0" y="0" width="40" height="40" fill="none"/><path d="M0 0h40v40H0z" fill="%231e1e1e"/><path d="M0 20h40M20 0v40" stroke="%232a2a2a" stroke-width="1"/></svg>');
}

.sim-box {
    background-color: #000;
    border: 1px solid var(--color-blue-accent);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 0 30px rgba(0, 123, 255, 0.1);
}

.sim-box h3 {
    color: var(--color-blue-accent);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
}

/* RAM Visualizer Styles */
.ram-visualizer-container {
    margin-bottom: 30px;
}

.ram-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-family: var(--font-tech);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.ram-bar-bg {
    height: 30px;
    background-color: #222;
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid #444;
}

.ram-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-blue-accent), var(--color-red-accent));
    transition: width 0.5s ease-in-out;
}

#system-status {
    margin-top: 10px;
    font-family: var(--font-tech);
    font-size: 0.9rem;
    text-align: right;
}

.status-stable { color: var(--color-green-accent); }
.status-critical { color: var(--color-red-accent); font-weight: bold; }

/* Terminal Styles */
.terminal-output {
    background-color: #0f0f0f;
    border: 1px solid #333;
    border-radius: 4px;
    height: 200px;
    display: flex;
    flex-direction: column;
}

.terminal-header {
    background-color: #222;
    padding: 5px 10px;
    font-family: var(--font-tech);
    font-size: 0.8rem;
    color: #777;
    border-bottom: 1px solid #333;
}

.terminal-log {
    padding: 10px;
    font-family: var(--font-tech);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    overflow-y: auto;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.log-line { margin-bottom: 5px; display: block; }
.log-error { color: var(--color-red-accent); }
.log-success { color: var(--color-green-accent); }

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    background-color: var(--color-bg-main);
    color: var(--color-text-secondary);
    border-top: 1px solid #333;
    font-size: 0.9rem;
}

/* --- Responsive Design --- */
@media (max-width: 1024px) {
    .hero h1 { font-size: 3rem; }
}

@media (max-width: 768px) {
    .nav-links { display: none; } /* Simple hide for mobile for now */
    
    .hero { padding: 60px 5%; }
    .hero h1 { font-size: 2.5rem; }

    /* Stack the split container vertically on mobile */
    .split-container {
        flex-direction: column;
        height: auto;
    }

    .left-panel, .right-panel {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #333;
        padding: 30px 5%;
    }
    
    .right-panel { min-height: 500px; } /* Ensure sim is visible */
}