:root {
    --bg-color: #0A1A0F;
    --bg-panel: #112A18;
    --text-primary: #ecf0f1;
    --text-muted: #7f8c8d;
    --accent: #2ECC71;
    --accent-hover: #27AE60;
    --warning: #F1C40F;
    --error: #E74C3C;
    --border: #1E462B;
    --border-radius: 12px;
    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    height: 100vh;
    display: flex;
    overflow: hidden;
}

.app-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.5rem;
    overflow-y: auto;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--accent);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

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

.text-accent {
    color: var(--accent);
}

.level-selector, .mission-briefing {
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 1rem;
}

h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.level-btn {
    width: 100%;
    text-align: left;
    padding: 0.75rem 1rem;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-sans);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.level-btn:hover {
    background-color: rgba(46, 204, 113, 0.1);
}

.level-btn.active {
    background-color: rgba(46, 204, 113, 0.15);
    border-color: var(--accent);
    color: var(--accent);
}

.level-btn.completed {
    border-left: 3px solid var(--accent);
}

.status-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-muted);
}

.level-btn.completed .status-indicator {
    background-color: var(--accent);
}

.level-btn.active .status-indicator {
    box-shadow: 0 0 8px var(--accent);
}

.mission-briefing h4 {
    color: var(--accent);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.mission-briefing p {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: #bdc3c7;
}

.mission-goal {
    font-size: 0.85rem;
    background-color: rgba(241, 196, 15, 0.1);
    border-left: 3px solid var(--warning);
    padding: 0.75rem;
    border-radius: 0 4px 4px 0;
    margin-bottom: 1rem;
}

.btn {
    padding: 0.6rem 1rem;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-sans);
    border: none;
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--accent);
    color: #000;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 0 10px rgba(46, 204, 113, 0.3);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--text-muted);
}

.hint-box {
    margin-top: 1rem;
    padding: 0.75rem;
    font-size: 0.85rem;
    background-color: rgba(46, 204, 113, 0.05);
    border: 1px dashed var(--accent);
    border-radius: 6px;
    color: #bdc3c7;
}

.hidden {
    display: none !important;
}

.stats-panel {
    margin-top: auto;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: var(--border-radius);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

.stat-label {
    color: var(--text-muted);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    position: relative;
    background-image: 
        radial-gradient(circle at top right, rgba(46, 204, 113, 0.05) 0%, transparent 50%),
        radial-gradient(circle at bottom left, rgba(46, 204, 113, 0.02) 0%, transparent 50%);
}

.terminal-container {
    flex: 1;
    background-color: #050A07;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
}

.terminal-header {
    height: 36px;
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 1rem;
    position: relative;
}

.window-controls {
    display: flex;
    gap: 8px;
}

.control {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.close { background-color: #FF5F56; }
.minimize { background-color: #FFBD2E; }
.maximize { background-color: #27C93F; }

.terminal-title {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.terminal-body {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    cursor: text;
}

.terminal-output {
    margin-bottom: 0.5rem;
    word-break: break-all;
    white-space: pre-wrap;
}

.terminal-output .welcome-message {
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.highlight {
    color: var(--warning);
    font-weight: bold;
}

.cmd-line {
    display: flex;
    margin-bottom: 0.2rem;
}

.prompt {
    color: var(--accent);
    margin-right: 0.5rem;
    white-space: nowrap;
}

.cwd {
    color: #3498db;
}

.cmd-text {
    color: #ecf0f1;
}

.cmd-output {
    color: #bdc3c7;
    margin-bottom: 1rem;
    white-space: pre-wrap;
}

.error-text {
    color: var(--error);
}

.dir-entry {
    color: #3498db;
    font-weight: bold;
}

.file-entry {
    color: #ecf0f1;
}

.exec-entry {
    color: var(--accent);
    font-weight: bold;
}

.terminal-input-line {
    display: flex;
    align-items: center;
}

.cmd-input {
    flex: 1;
    background: transparent;
    border: none;
    color: #ecf0f1;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    outline: none;
    caret-color: var(--accent);
}

/* Modal */
.modal {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease-out forwards;
}

.modal-content {
    background-color: var(--bg-panel);
    border: 1px solid var(--accent);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    text-align: center;
    max-width: 450px;
    box-shadow: 0 0 30px rgba(46, 204, 113, 0.2);
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.modal-content h2 {
    color: var(--accent);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.modal-content p {
    margin-bottom: 1.5rem;
}

.flag-display {
    font-family: var(--font-mono);
    background-color: #050A07;
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--warning);
    color: var(--warning);
    font-size: 1.2rem;
    letter-spacing: 1px;
    margin: 1.5rem 0;
    word-break: break-all;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: 40%;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .main-content {
        height: 60%;
    }
}