body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: #333;
    background-color: #f7f9fc;
}

.app-header {
    background: #fff;
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.app-header .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #1a73e8;
}
.app-header .logo span { color: #555; }
.app-header nav a {
    margin-left: 1rem;
    text-decoration: none;
    color: #555;
    font-weight: 500;
}
.app-header nav a:hover { color: #1a73e8; }

.sim-container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.module-card {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}
.module-card h2 { margin-top: 0; color: #1a73e8; }
.module-card p { color: #666; }

/* Simulation Layout */
.sim-layout {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}
.sim-canvas-wrapper {
    flex: 1 1 400px;
    display: flex;
    justify-content: center;
}
canvas {
    background: #fafafa;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    cursor: crosshair;
}

.sim-controls {
    flex: 1 1 300px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.control-box, .explanation-box {
    background: #f0f4f8;
    padding: 1.5rem;
    border-radius: 8px;
}
.control-box h3, .explanation-box h3 { margin-top: 0; font-size: 1.1rem; }

.slider-group { margin-bottom: 1rem; }
.slider-group label { display: block; margin-bottom: 0.5rem; font-weight: bold; font-size: 0.9rem;}
.slider-group input { width: 100%; }

.explanation-box ol { padding-left: 1.2rem; margin-bottom: 0; }
.explanation-box li { margin-bottom: 0.5rem; }

/* Quiz Styling */
.quiz-question {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}
.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-top: 1rem;
}
.quiz-options button, .action-btn {
    background: #fff;
    border: 1px solid #cbd5e1;
    padding: 0.8rem;
    text-align: left;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
}
.quiz-options button:hover { background: #f1f5f9; border-color: #94a3b8; }

.action-btn {
    background: #1a73e8;
    color: white;
    border: none;
    text-align: center;
    font-weight: 500;
}
.action-btn:hover { background: #1557b0; }
.hint-btn { background: transparent; color: #1a73e8; border: none; text-decoration: underline; padding: 0;}

.feedback { margin-top: 1rem; padding: 1rem; border-radius: 6px; font-weight: 500; }
.feedback.correct { background: #dcfce7; color: #166534; }
.feedback.incorrect { background: #fee2e2; color: #991b1b; }

/* Dashboard Tables */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}
.admin-table th, .admin-table td {
    padding: 1rem;
    border-bottom: 1px solid #e2e8f0;
    text-align: left;
}
.admin-table th { background: #f8fafc; color: #475569; font-weight: 600; }

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 500;
}
.badge.new { background: #dbeafe; color: #1e40af; }
.badge.contacted { background: #fef3c7; color: #92400e; }
.badge.converted { background: #dcfce7; color: #166534; }